Lincoln Navigator: Climate Control System - General Information / Climate Control System. Diagnosis and Testing

Normal Operation and Fault Conditions

A/C Pressure Transducer, REFER to: Climate Control System - System Operation and Component Description (412-00 Climate Control System - General Information, Description and Operation).

DTC Fault Trigger Conditions

Possible Sources

• Wiring, terminals or connectors
• Refrigerant charge abnormally high or low
• A/C pressure transducer
• PCM or SOBDMC

Visual Inspection and Pre-checks

• Inspect for loose or corroded A/C pressure transducer connections.

NOTICE: Use the correct probe adapter(s) when making measurements. Failure to use the correct probe adapter(s) may damage the connector.

• Allow the A/C system to stabilize to the outside ambient temperature.

• Ignition ON.

• Using a diagnostic scan tool, view PCM Parameter Identifications (PIDs).

• With the manifold gauge set connected, compare the pressure readings of the manifold gauge set and the PCM ACP_PRESS PID .

• Ignition OFF.

• Disconnect PCM C175B .

• Disconnect A/C pressure transducer C1260 .

• Ignition ON.

• Measure:
  Click to display connectors
  

  Positive Lead	Measurement / Action	Negative Lead
  C1260-1		Ground
  C1260-2		Ground
  C1260-3		Ground

• Ignition OFF.

• Measure:
  Click to display connectors
  

  Positive Lead	Measurement / Action	Negative Lead
  C1260-1		Ground
  C1260-2		Ground
  C1260-3		Ground

• Measure:
  Click to display connectors
  

  Positive Lead	Measurement / Action	Negative Lead
  C1260-1		C175B-81
  C1260-2		C175B-51
  C1260-3		C175B-84

• Measure:
  Click to display connectors
  

  Positive Lead	Measurement / Action	Negative Lead
  C1260-1		C1260-2
  C1260-1		C1260-3
  C1260-2		C1260-3

• Ignition OFF.

• Disconnect and inspect all PCM connectors.

• Repair:
  • corrosion (install new connector or terminals – clean module pins)
  • damaged or bent pins – install new terminals/pins
  • pushed-out pins – install new pins as necessary

• Reconnect all PCM connectors. Make sure they seat and latch correctly.

• Operate the system and determine if the concern is still present.

Yes	CHECK OASIS for any applicable service articles: TSB , GSB , SSM or FSA . If a service article exists for this concern, DISCONTINUE this test and FOLLOW the service article instructions. If no service articles address this concern,    Click here to access Guided Routine (PCM).

Normal Operation and Fault Conditions

Voltage is provided to the A/C clutch SMART (FET) at all times. The A/C clutch SMART (FET) is a non serviceable part of the printed circuit board on the BCMC [also known as BJB ].

When A/C is requested and A/C line pressures and all conditions allow, the PCM provides a ground to the A/C clutch SMART (FET) control input circuit, energizing the A/C clutch SMART (FET). For additional information on A/C Request, REFER to: Climate Control System - System Operation and Component Description (412-00 Climate Control System - General Information, Description and Operation).

DTC Fault Trigger Conditions

Possible Sources

• Fuse
• Wiring, terminals or connectors
• A/C clutch Smart FET control [non-serviceable, part of the BJB ]
• PCM
• BCMC

NOTICE: Use the correct probe adapter(s) from the Flex Probe Kit when taking measurements. Failure to use the correct probe adapter(s) may damage the connector.

• Ignition OFF.

• Disconnect BJB C1035B and C1035C .

• Disconnect PCM , C175B .

• Disconnect A/C clutch and A/C clutch field coil C100A .

• Ignition ON.

• Measure:
  Click to display connectors
  

  Positive Lead	Measurement / Action	Negative Lead
  C1035B-29		Ground

  
  Click to display connectors
  

  Positive Lead	Measurement / Action	Negative Lead
  C1035C-5		Ground

• Ignition OFF.

• Measure:
  Click to display connectors
  

  Positive Lead	Measurement / Action	Negative Lead
  C1035B-29		Ground

  
  Click to display connectors
  

  Positive Lead	Measurement / Action	Negative Lead
  C1035C-5		Ground

• Ignition OFF.

• Measure:
  Click to display connectors

    Input Circuit from Powertrain Control Module (PCM) to Body Control Module C (BCMC)

  
  

  Positive Lead	Measurement / Action	Negative Lead
  C1035B-29		C175B-44

• Measure:
  Click to display connectors
  

  Positive Lead	Measurement / Action	Negative Lead
  C100A-2		Ground

• Measure:
  Click to display connectors

    Smart FET Output Circuit from Body Control Module C (BCMC) to A/C Clutch Field Coil C100

  
  

  Positive Lead	Measurement / Action	Negative Lead
  C1035C-5		C100A-1

• Connect PCM , C175B .

• Connect BJB C1035B and C1035C .

• Connect A/C clutch and A/C clutch field coil C100A .

• Ignition ON.

• Using a diagnostic scan tool, Clear all Diagnostic Trouble Codes (DTCs). Carry Out the PCM self-test and the BCMC self-test.

• Ignition OFF.

• Wait one minute.

• Ignition ON.

• Access the  PCM  and control the  ACC_CMD  PID

• Ignition OFF.

• Disconnect and inspect all PCM connectors.

• Repair:
  • corrosion (install new connector or terminals – clean module pins)
  • damaged or bent pins – install new terminals/pins
  • pushed-out pins – install new pins as necessary

• Reconnect all PCM connectors. Make sure they seat and latch correctly.

• Operate the system and determine if the concern is still present.

Yes	CHECK OASIS for any applicable service articles: TSB , GSB , SSM or FSA . If a service article exists for this concern, DISCONTINUE this test and FOLLOW the service article instructions. If no service articles address this concern,    Click here to access Guided Routine (PCM).

• Ignition OFF.

• Disconnect and inspect all BCMC electrical connectors.

• Repair:
  • corrosion (install new connector or terminal - clean module pins)
  • damaged or bent pins - install new terminals or pins
  • pushed-out pins - install new pins as necessary

• Connect all BCMC electrical connectors. Make sure they seat and latch correctly.

• Operate the system and determine if the concern is still present.

Normal Operation and Fault Conditions

The externally controlled variable displacement compressor is electronically controlled by the PCM . The PCM pulse width modulates the ground to the externally controlled variable displacement compressor to change the displacement of the A/C compressor. REFER to: Climate Control System - System Operation and Component Description (412-00 Climate Control System - General Information, Description and Operation).

DTC Fault Trigger Conditions

Possible Sources

• Fuse
• Wiring, terminals or connectors
• A/C system discharged or low refrigerant charge
• A/C compressor
• PCM

Visual Inspection and Pre-checks

• Inspect for loose or corroded A/C compressor connections.
• Make sure BJB fuse 8 (20A) is OK.
• Verify the A/C compressor belt is OK.
• Verify the A/C compressor clutch is engaged/operating.

NOTICE: Use the correct probe adapter(s) when making measurements. Failure to use the correct probe adapter(s) may cause damage to the connector.

NOTE: Make sure the Air Conditioning (A/C) Compressor clutch is on or is engaged in this step.

NOTE: Proper Air Conditioning (A/C) system diagnosis on a vehicle's compressor is dependent on correct refrigerant system charge and tested in ambient temperatures above 21.1°C (70°F).

NOTE: Make sure the EVDC100 Tester, the EVDC101 valve harness module, (and the connector adapter EVDC102, if required) are properly connected per the instruction manual and the operation video.

• Test the EVDC compressor displacement, following the instructions in the user manual supplied with the Model EVDC®100 A/C Compressor Electronic Control Valve Tester and the EVDC 100 Tester Operation video found on the Ford PTS Home tab, Technical Support Videos.

• Ignition OFF.

• Disconnect Externally Controlled Variable Displacement Compressor (EVDC) C100B .

• Ignition ON.

• Measure:
  Click to display connectors
  

  Positive Lead	Measurement / Action	Negative Lead
  C100B-1		Ground

• Ignition OFF.

• Disconnect PCM C175B .

• Ignition ON.

• Measure:
  Click to display connectors
  

  Positive Lead	Measurement / Action	Negative Lead
  C100B-2		Ground

• Ignition OFF.

• Measure:
  Click to display connectors
  

  Positive Lead	Measurement / Action	Negative Lead
  C100B-2		Ground

• Measure:
  Click to display connectors
  

  Positive Lead	Measurement / Action	Negative Lead
  C100B-2		C175B-10

• Ignition OFF.

• Disconnect and inspect all PCM electrical connectors (if not previously disconnected).

• Repair:
  • corrosion (install new connector or terminal - clean module pins)
  • damaged or bent pins - install new terminals or pins
  • pushed-out pins - install new pins as necessary

• Connect all PCM electrical connectors. Make sure they seat and latch correctly.

• Operate the system and determine if the concern is still present.

Yes	CHECK OASIS for any applicable service articles: TSB , GSB , SSM or FSA . If a service article exists for this concern, DISCONTINUE this test and FOLLOW the service article instructions. If no service articles address this concern,    Click here to access Guided Routine (PCM).

• Ignition OFF.

• Disconnect and inspect all electrical connectors on the compressor

• Repair:
  • corrosion (install new connector or terminal - clean module pins)
  • damaged or bent pins - install new terminals or pins
  • pushed-out pins - install new pins as necessary

• Connect all Compressor electrical connectors. Make sure they seat and latch correctly.

• Operate the system and determine if the concern is still present.

Normal Operation and Fault Conditions

Air Inlet Door Actuator, REFER to: Climate Control System - System Operation and Component Description (412-00 Climate Control System - General Information, Description and Operation).

During an actuator calibration cycle, the FCIM drives the air inlet door until the door reaches both internal stops in the FCIM case. If the air inlet mode door is temporarily obstructed or binding during a calibration cycle, the FCIM may interpret this as the actual end of travel for the door. When this condition occurs and the FCIM commands the actuator to its end of travel, the air intake may not be from the expected source.

DTC Fault Trigger Conditions

Possible Sources

• Wiring, terminals or connectors
• Actuator door binding, stuck or slipping
• Air inlet door actuator
• FCIM

NOTICE: Use the correct probe adapter(s) when making measurements. Failure to use the correct probe adapter(s) may damage the connector.

• Ignition OFF.

• Disconnect FCIM C2402A and C2402B .

• Ignition ON.

• Measure:
  Click to display connectors
  

  Positive Lead	Measurement / Action	Negative Lead
  C2402A-2		Ground
  C2402A-16		Ground
  C2402A-3		Ground
  C2402A-24		Ground
  C2402A-25		Ground

• Ignition OFF.

• Measure:
  Click to display connectors
  

  Positive Lead	Measurement / Action	Negative Lead
  C2402A-2		Ground
  C2402A-16		Ground
  C2402A-3		Ground
  C2402A-24		Ground
  C2402A-25		Ground

NOTE: Access to the connector in the following step is difficult. Before carrying out this step, visually inspect the harness for obvious damage. If no damage is evident, proceed with the test.

• Disconnect Air inlet door actuator C289 .

• Measure:
  Click to display connectors
  

  Positive Lead	Measurement / Action	Negative Lead
  C2402A-2		C289-1
  C2402A-16		C289-2
  C2402A-3		C289-3
  C2402A-24		C289-5
  C2402A-25		C289-6

NOTE: Access to the connectors in the following step is difficult. Before carrying out this step, visually inspect the harness for obvious damage. If no damage is evident, proceed with the test.

• Disconnect In-vehicle temperature and humidity sensor C910 .

• Disconnect Driver temperature door actuator C2091 .

• Disconnect Passenger temperature door actuator C2092 .

• Disconnect Air distribution door actuator C236 .

• Disconnect Rear air distribution door actuator C3044 .

• Disconnect Rear temperature door actuator C3004 .

• Measure:
  Click to display connectors
  

  Positive Lead	Measurement / Action	Negative Lead
  C289-1		C289-2
  C289-1		C289-3
  C289-1		C289-5
  C289-1		C289-6
  C289-2		C289-3
  C289-2		C289-5
  C289-2		C289-6
  C289-3		C289-5
  C289-3		C289-6
  C289-5		C289-6

• Ignition OFF.

• Disconnect and inspect all the FCIM connectors.

• Repair:
  • corrosion (install new connector or terminals – clean module pins)
  • damaged or bent pins – install new terminals/pins
  • pushed-out pins – install new pins as necessary

• Reconnect all FCIM connectors. Make sure they seat and latch correctly.

• Operate the system and determine if the concern is still present.

Normal Operation and Fault Conditions

To rotate the air distribution door actuator, the FCIM supplies voltage and ground to the air distribution door actuator through the door actuator motor circuits. To reverse the air distribution door actuator rotation, the FCIM reverses the voltage and ground circuits. The air distribution door actuator feedback resistors are supplied a ground from the FCIM by the air distribution door actuator return circuits and a 5-volt reference voltage on the air distribution door actuator reference circuits. The FCIM uses the actuator feedback resistor wiper arm position and the voltage on the air distribution door actuator feedback circuits to determine the air distribution door actuator position.

During an actuator calibration cycle, the FCIM drives the air distribution door until the door reaches both internal stops in the FCIM case. If the air distribution door is temporarily obstructed or binding during a calibration cycle, the FCIM may interpret this as the actual end of travel for the door. When this condition occurs and the FCIM commands the actuator to its end of travel, the airflow may not be from the expected outlets.

DTC Fault Trigger Conditions

Possible Sources

NOTICE: Use the correct probe adapter(s) when making measurements. Failure to use the correct probe adapter(s) may damage the connector.

• Ignition OFF.

• Disconnect FCIM C2402A and C2402B .

• Disconnect Air distribution door actuator C236 .

• Ignition ON.

• Measure:
  Click to display connectors
  

  Positive Lead	Measurement / Action	Negative Lead
  C2402A-20		Ground
  C2402A-2		Ground
  C2402A-3		Ground
  C2402A-22		Ground
  C2402A-21		Ground

• Ignition OFF.

• Measure:
  Click to display connectors
  

  Positive Lead	Measurement / Action	Negative Lead
  C2402A-20		Ground
  C2402A-2		Ground
  C2402A-3		Ground
  C2402A-22		Ground
  C2402A-21		Ground

• Measure:
  Click to display connectors
  

  Positive Lead	Measurement / Action	Negative Lead
  C2402A-20		C236-1
  C2402A-2		C236-2
  C2402A-3		C236-3
  C2402A-22		C236-4
  C2402A-21		C236-6

• Disconnect In-vehicle temperature and humidity sensor C910 .

• Disconnect Driver temperature door actuator C2091 .

• Disconnect Passenger temperature door actuator C2092 .

• Disconnect Air inlet door actuator C289 .

• Disconnect Rear air distribution door actuator C3044 .

• Disconnect Rear temperature door actuator C3004 .

• Measure:
  Click to display connectors
  

  Positive Lead	Measurement / Action	Negative Lead
  C236-1		C236-2
  C236-1		C236-3
  C236-1		C236-4
  C236-1		C236-6
  C236-2		C236-3
  C236-2		C236-4
  C236-2		C236-6
  C236-3		C236-4
  C236-3		C236-6
  C236-4		C236-6

• Ignition OFF.

• Disconnect and inspect all the FCIM connectors.

• Repair:
  • corrosion (install new connector or terminals – clean module pins)
  • damaged or bent pins – install new terminals/pins
  • pushed-out pins – install new pins as necessary

• Reconnect all FCIM connectors. Make sure they seat and latch correctly.

• Operate the system and determine if the concern is still present.

Normal Operation and Fault Conditions

When the engine is at operating temperature hot coolant primarily flows from the engine through the heater core and back to the engine. Correct coolant temperatures are critical for good heater performance. A restriction of coolant flow due to a transmission fluid heater coolant control valve (if equipped), or a cabin heater coolant pump (if equipped), may cause poor coolant flow to the heater core.

Possible Sources

• Low engine coolant level
• (If equipped) transmission fluid heater coolant control valve
• (If equipped) cabin heater coolant diverter valve (PHEV)
• Plugged or partially plugged heater core
• Temperature door binding or stuck
• Temperature door actuator

Visual Inspection and Pre-checks

• Inspect for low engine coolant level.

NOTE: Restriction of air flow through the radiator or Air Conditioning (A/C) condenser by an external obstruction such as leaves or cardboard can cause erratic operation.

• Ignition OFF.

• Check the engine coolant level.

• Pressure test the cooling system for leaks. Refer to the appropriate section in Group 303 for the procedure.

• Run the engine until it reaches normal operating temperature.

• On the HVAC controls, select the FLOOR position, then set the temperature control to full warm and the blower to the lowest setting.

• Using a suitable temperature measuring device, check the temperature of the heater core inlet hose.

• Using a suitable temperature measuring device, measure the temperature of the heater core outlet hose.

• INSTALL a temporary bypass hose from the heater core outlet to the thermostat housing assembly (as applicable).

• Using a suitable temperature measuring device, measure the heater core inlet and outlet hose temperatures.

Normal Operation and Fault Conditions

To rotate the driver temperature door actuator, the FCIM supplies voltage and ground to the temperature door actuator through the motor circuits. To reverse the temperature door actuator rotation, the FCIM reverses the voltage and ground circuits. The actuator feedback resistors are supplied a ground from the FCIM by the actuator return circuits and a 5-volt reference voltage on the actuator reference circuits. The FCIM uses the actuator feedback resistor wiper arm position and the voltage on the actuator feedback circuits to determine the temperature door actuator position.

During an actuator calibration cycle, the FCIM drives the temperature door until the door reaches both internal stops in the HVAC case. If the temperature door is temporarily obstructed or binding during a calibration cycle, the FCIM may interpret this as the actual end of travel for the door. When this condition occurs and the FCIM commands the actuator to its end of travel, the temperature may not be as expected.

DTC Fault Trigger Conditions

Possible Sources

• Wiring, terminals or connectors
• Actuator doors binding, stuck or slipping
• Temperature door actuator
• FCIM

NOTICE: Use the correct probe adapter(s) when making measurements. Failure to use the correct probe adapter(s) may damage the connector.

• Ignition OFF.

• Disconnect FCIM C2402A and C2402B .

• Disconnect Drivers temperature door actuator C2091 .

• Ignition ON.

• Measure:
  Click to display connectors
  

  Positive Lead	Measurement / Action	Negative Lead
  C2402A-8		Ground
  C2402A-2		Ground
  C2402A-3		Ground
  C2402A-10		Ground
  C2402A-9		Ground

• Ignition OFF.

• Measure:
  Click to display connectors
  

  Positive Lead	Measurement / Action	Negative Lead
  C2402A-8		Ground
  C2402A-2		Ground
  C2402A-3		Ground
  C2402A-10		Ground
  C2402A-9		Ground

• Measure:
  Click to display connectors
  

  Positive Lead	Measurement / Action	Negative Lead
  C2402A-8		C2091-1
  C2402A-2		C2091-2
  C2402A-3		C2091-3
  C2402A-10		C2091-4
  C2402A-9		C2091-6

• Disconnect In-vehicle temperature and humidity sensor C910 .

• Disconnect Passenger side temperature door actuator C2092 .

• Disconnect Air distribution door actuator C236 .

• Disconnect Air inlet door actuator C289 .

• Disconnect Rear air distribution door actuator C3044 .

• Disconnect Rear temperature door actuator C3004 .

• Measure:
  Click to display connectors
  

  Positive Lead	Measurement / Action	Negative Lead
  C2091-1		C2091-2
  C2091-1		C2091-3
  C2091-1		C2091-4
  C2091-1		C2091-6
  C2091-2		C2091-3
  C2091-2		C2091-4
  C2091-2		C2091-6
  C2091-3		C2091-4
  C2091-3		C2091-6
  C2091-4		C2091-6

• Ignition OFF.

• Disconnect and inspect all FCIM connectors.

• Repair:
  • corrosion (install new connector or terminals – clean module pins)
  • damaged or bent pins – install new terminals/pins
  • pushed-out pins – install new pins as necessary

• Reconnect all FCIM connectors. Make sure they seat and latch correctly.

• Operate the system and determine if the concern is still present.

Normal Operation and Fault Conditions

To rotate the passenger temperature door actuator, the FCIM supplies voltage and ground to the temperature door actuator through the motor circuits. To reverse the temperature door actuator rotation, the FCIM reverses the voltage and ground circuits. The actuator feedback resistors are supplied a ground from the FCIM by the actuator return circuits and a 5-volt reference voltage on the actuator reference circuits. The FCIM uses the actuator feedback resistor wiper arm position and the voltage on the actuator feedback circuits to determine the temperature door actuator position.

During an actuator calibration cycle, the FCIM drives the temperature door until the door reaches both internal stops in the HVAC case. If the temperature door is temporarily obstructed or binding during a calibration cycle, the FCIM may interpret this as the actual end of travel for the door. When this condition occurs and the FCIM commands the actuator to its end of travel, the temperature may not be as expected.

DTC Fault Trigger Conditions

Possible Sources

• Wiring, terminals or connectors
• Actuator doors binding, stuck or slipping
• Passenger temperature door actuator
• FCIM

NOTICE: Use the correct probe adapter(s) when making measurements. Failure to use the correct probe adapter(s) may damage the connector.

• Ignition OFF.

• Disconnect FCIM C2402A and C2402B .

• Ignition ON.

• Measure:
  Click to display connectors
  

  Positive Lead	Measurement / Action	Negative Lead
  C2402A-2		Ground
  C2402A-3		Ground

  
  Click to display connectors
  

  Positive Lead	Measurement / Action	Negative Lead
  C2402B-13		Ground
  C2402B-18		Ground
  C2402B-14		Ground

• Ignition OFF.

• Measure:
  Click to display connectors
  

  Positive Lead	Measurement / Action	Negative Lead
  C2402A-2		Ground
  C2402A-3		Ground

  
  Click to display connectors
  

  Positive Lead	Measurement / Action	Negative Lead
  C2402B-13		Ground
  C2402B-18		Ground
  C2402B-14		Ground

NOTE: Access to the connector in the following step is difficult. Before carrying out this step, visually inspect the harness for obvious damage. If no damage is evident, proceed with the test.

• Disconnect Passenger side temperature door actuator C2092 .

• Measure:
  Click to display connectors
  

  Positive Lead	Measurement / Action	Negative Lead
  C2402A-2		C2092-2
  C2402A-3		C2092-3

  
  Click to display connectors
  

  Positive Lead	Measurement / Action	Negative Lead
  C2402B-13		C2092-1
  C2402B-18		C2092-4
  C2402B-14		C2092-6

NOTE: Access to the connectors in the following step is difficult. Before carrying out this step, visually inspect the harness for obvious damage. If no damage is evident, proceed with the test.

• Disconnect In-vehicle temperature and humidity sensor C910 .

• Disconnect Drivers side temperature door actuator C2091 .

• Disconnect Air distribution door actuator C236 .

• Disconnect Air inlet door actuator C289 .

• Disconnect Rear air distribution door actuator C3044 .

• Disconnect Rear temperature door actuator C3004 .

• Measure:
  Click to display connectors
  

  Positive Lead	Measurement / Action	Negative Lead
  C2092-1		C2092-2
  C2092-1		C2092-3
  C2092-1		C2092-4
  C2092-1		C2092-6
  C2092-2		C2092-3
  C2092-2		C2092-4
  C2092-2		C2092-6
  C2092-3		C2092-4
  C2092-3		C2092-6
  C2092-4		C2092-6

• Ignition OFF.

• Disconnect and inspect all FCIM connectors.

• Repair:
  • corrosion (install new connector or terminals – clean module pins)
  • damaged or bent pins – install new terminals/pins
  • pushed-out pins – install new pins as necessary

• Reconnect all FCIM connectors. Make sure they seat and latch correctly.

• Operate the system and determine if the concern is still present.

Normal Operation and Fault Conditions

Voltage is supplied to the blower motor relay switched contact from the BJB . Ground to the relay coil is a dedicated circuit. When the blower motor relay coil receives power from the FCIM , the relay coil is energized and voltage is delivered to the blower motor control module. Power and ground for the blower motor is provided by the blower motor control module. The FCIM sends a PWM signal to the blower motor control module to control the blower speed. The blower motor and the blower motor speed control are combined into one assembly called the blower motor control module. The blower motor relay is a non serviceable part of the printed circuit board on the BJB .

DTC Fault Trigger Conditions

Possible Sources

• Fuse
• Wiring, terminals or connectors
• Blower motor relay [non-serviceable, part of the BJB ]
• Blower motor control module
• FCIM

Visual Inspection and Pre-checks

• Make sure BJB fuse 13 (40A) is OK.

NOTICE: Use the correct probe adapter(s) when making measurements. Failure to use the correct probe adapter(s) may damage the connector.

• Ignition OFF.

• Disconnect BJB C1035C .

• Measure:
  Click to display connectors
  

  Positive Lead	Measurement / Action	Negative Lead
  C1035C-1		Ground

• Disconnect FCIM C2402A and C2402B .

• Measure:
  Click to display connectors
  

  Positive Lead	Measurement / Action	Negative Lead
  C2402A-11		Ground

• Measure:
  Click to display connectors
  

  Positive Lead	Measurement / Action	Negative Lead
  C2402A-11		C1035C-37

• Disconnect Blower motor control module C297 .

• Ignition ON.

• Measure:
  Click to display connectors
  

  Positive Lead	Measurement / Action	Negative Lead
  C297-4		Ground

• Ignition OFF.

• Measure:
  Click to display connectors
  

  Positive Lead	Measurement / Action	Negative Lead
  C297-3		Ground
  C297-4		Ground

• Measure:
  Click to display connectors
  

  Positive Lead	Measurement / Action	Negative Lead
  C297-1		Ground

  
  Click to display connectors
  

  Positive Lead	Measurement / Action	Negative Lead
  C297-3		C1035C-57

  
  Click to display connectors
  

  Positive Lead	Measurement / Action	Negative Lead
  C297-4		C2402A-23

• Measure:
  Click to display connectors
  

  Positive Lead	Measurement / Action	Negative Lead
  C297-1		C297-3
  C297-1		C297-4
  C297-3		C297-4

• Connect BJB C1035C .

• Connect FCIM C2402A and C2402B .

• Ignition ON.

• Select PANEL on the HVAC controls.

• Select the highest blower motor setting.

• Measure:
  Click to display connectors
  

  Positive Lead	Measurement / Action	Negative Lead
  C297-3		Ground

• Ignition OFF.

• Disconnect and inspect the blower motor speed control connector.

• Repair:
  • corrosion (install new connector or terminals – clean module pins)
  • damaged or bent pins – install new terminals/pins
  • pushed-out pins – install new pins as necessary

• Reconnect the blower motor speed control connector. Make sure it seats and latches correctly.

• Operate the system and determine if the concern is still present.

• Ignition OFF.

• Disconnect and inspect all FCIM connectors.

• Repair:
  • corrosion (install new connector or terminals – clean module pins)
  • damaged or bent pins – install new terminals/pins
  • pushed-out pins – install new pins as necessary

• Reconnect all FCIM connectors. Make sure they seat and latch correctly.

• Operate the system and determine if the concern is still present.

Normal Operation and Fault Conditions

Voltage is supplied to the blower motor relay switched contact from the BJB . Ground to the relay coil is a dedicated circuit. When the blower motor relay coil receives power from the FCIM , the relay coil is energized and voltage is delivered to the blower motor control module. Power and ground for the blower motor is provided by the blower motor control module. The FCIM sends a PWM signal to the blower motor control module to control the blower speed. The blower motor and the blower motor speed control are combined into one assembly called the blower motor control module. The blower motor relay is a non serviceable part of the printed circuit board on the BJB .

DTC Fault Trigger Conditions

Possible Sources

• Fuse
• Wiring, terminals or connectors
• Blower motor relay [non-serviceable, part of the BJB ]
• Blower motor control module
• FCIM

Visual Inspection and Pre-checks

• Make sure BJB fuse 13 (40A) is OK.

NOTICE: Use the correct probe adapter(s) when making measurements. Failure to use the correct probe adapter(s) may damage the connector.

• Ignition ON.

• Select panel on the HVAC controls. Adjust the blower motor setting to the minimum and maximum settings, observing the blower motor operation in each setting.

• Ignition OFF.

• Disconnect Blower motor control module C297 .

• Disconnect FCIM C2402A and C2402B .

• Measure:
  Click to display connectors
  

  Positive Lead	Measurement / Action	Negative Lead
  C2402A-23		Ground

• Ignition ON.

• Measure:
  Click to display connectors
  

  Positive Lead	Measurement / Action	Negative Lead
  C2402A-11		Ground

• Ignition OFF.

• Disconnect BJB fuse 13 (40A).

• Ignition ON.

• Measure:
  Click to display connectors
  

  Positive Lead	Measurement / Action	Negative Lead
  C297-3		Ground

• Ignition OFF.

• Disconnect and inspect the blower motor control module connector.

• Repair:
  • corrosion (install new connector or terminals – clean module pins)
  • damaged or bent pins – install new terminals/pins
  • pushed-out pins – install new pins as necessary

• Reconnect the blower motor control module connector. Make sure it seats and latches correctly.

• Connect All disconnected connectors and fuses.

• Operate the system and determine if the concern is still present.

• Ignition OFF.

• Disconnect and inspect all FCIM connectors.

• Repair:
  • corrosion (install new connector or terminals – clean module pins)
  • damaged or bent pins – install new terminals/pins
  • pushed-out pins – install new pins as necessary

• Reconnect all FCIM connectors. Make sure they seat and latch correctly.

• Operate the system and determine if the concern is still present.

Normal Operation and Fault Conditions

The 4 air discharge sensors supply a varying voltage to the FCIM based on the temperature of the air being discharged from the vent. The FCIM adjusts the system based on the voltage from each sensor.

Each air discharge sensor is supplied voltage from the FCIM and all sensors share a common sensor ground. An open, a short to ground, a short to voltage on one or more of these circuits or a failed air discharge sensor causes the FCIM to set one or more Diagnostic Trouble Codes (DTCs).

DTC Fault Trigger Conditions

Possible Sources

• Wiring, terminals or connectors
• Air discharge temperature sensor
• FCIM

NOTICE: Use the correct probe adapter(s) when making measurements. Failure to use the correct probe adapter(s) may damage the connector.

• Ignition OFF.

• Disconnect the suspect air discharge temperature sensor:
  • Driver side footwell (floor) air discharge temperature sensor C2436
  • Driver side register (panel) air discharge temperature sensor C2438
  • Passenger side footwell (floor) air discharge temperature sensor C2437
  • Passenger side register (panel) air discharge temperature sensor C2439

• Ignition ON.

• Turn the HVAC system on.

• Measure:
  Click to display connectors

    Driver side footwell (floor) air discharge temperature sensor

  
  

  Positive Lead	Measurement / Action	Negative Lead
  C2436-A		C2436-B

  
  Click to display connectors

    Driver side register (panel) air discharge temperature sensor

  
  

  Positive Lead	Measurement / Action	Negative Lead
  C2438-1		C2438-3

  
  Click to display connectors

    Passenger side footwell (floor) air discharge temperature sensor

  
  

  Positive Lead	Measurement / Action	Negative Lead
  C2437-A		C2437-B

  
  Click to display connectors

    Passenger side register (panel) air discharge temperature sensor

  
  

  Positive Lead	Measurement / Action	Negative Lead
  C2439-1		C2439-3

• Ignition OFF.

• Disconnect FCIM C2402A and C2402B .

• Ignition ON.

• Measure:
  Click to display connectors

    Driver side footwell (floor) air discharge temperature sensor

  
  

  Positive Lead	Measurement / Action	Negative Lead
  C2436-A		Ground

  
  Click to display connectors

    Driver side register (panel) air discharge temperature sensor

  
  

  Positive Lead	Measurement / Action	Negative Lead
  C2438-1		Ground

  
  Click to display connectors

    Passenger side footwell (floor) air discharge temperature sensor

  
  

  Positive Lead	Measurement / Action	Negative Lead
  C2437-A		Ground

  
  Click to display connectors

    Passenger side register (panel) air discharge temperature sensor

  
  

  Positive Lead	Measurement / Action	Negative Lead
  C2439-1		Ground

• Measure:
  Click to display connectors

    Driver side footwell (floor) air discharge temperature sensor

  
  

  Positive Lead	Measurement / Action	Negative Lead
  C2436-B		Ground

  
  Click to display connectors

    Driver side register (panel) air discharge temperature sensor

  
  

  Positive Lead	Measurement / Action	Negative Lead
  C2438-3		Ground

  
  Click to display connectors

    Passenger side footwell (floor) air discharge temperature sensor

  
  

  Positive Lead	Measurement / Action	Negative Lead
  C2437-B		Ground

  
  Click to display connectors

    Passenger side register (panel) air discharge temperature sensor

  
  

  Positive Lead	Measurement / Action	Negative Lead
  C2439-3		Ground

• Ignition OFF.

• Measure:
  Click to display connectors

    Driver side footwell (floor) air discharge temperature sensor

  
  

  Positive Lead	Measurement / Action	Negative Lead
  C2436-A		Ground

  
  Click to display connectors

    Driver side register (panel) air discharge temperature sensor

  
  

  Positive Lead	Measurement / Action	Negative Lead
  C2438-1		Ground

  
  Click to display connectors

    Passenger side footwell (floor) air discharge temperature sensor

  
  

  Positive Lead	Measurement / Action	Negative Lead
  C2437-A		Ground

  
  Click to display connectors

    Passenger side register (panel) air discharge temperature sensor

  
  

  Positive Lead	Measurement / Action	Negative Lead
  C2439-1		Ground

• Measure:
  Click to display connectors

    Driver side footwell (floor) air discharge temperature sensor

  
  

  Positive Lead	Measurement / Action	Negative Lead
  C2436-B		Ground

  
  Click to display connectors

    Driver side register (panel) air discharge temperature sensor

  
  

  Positive Lead	Measurement / Action	Negative Lead
  C2438-3		Ground

  
  Click to display connectors

    Passenger side footwell (floor) air discharge temperature sensor

  
  

  Positive Lead	Measurement / Action	Negative Lead
  C2437-B		Ground

  
  Click to display connectors

    Passenger side register (panel) air discharge temperature sensor

  
  

  Positive Lead	Measurement / Action	Negative Lead
  C2439-3		Ground

• Measure:
  Click to display connectors

    Driver side footwell (floor) air discharge temperature sensor

  
  

  Positive Lead	Measurement / Action	Negative Lead
  C2436-A		C2402B-5

  
  Click to display connectors

    Driver side register (panel) air discharge temperature sensor

  
  

  Positive Lead	Measurement / Action	Negative Lead
  C2438-1		C2402B-4

  
  Click to display connectors

    Passenger side footwell (floor) air discharge temperature sensor

  
  

  Positive Lead	Measurement / Action	Negative Lead
  C2437-A		C2402B-11

  
  Click to display connectors

    Passenger side register (panel) air discharge temperature sensor

  
  

  Positive Lead	Measurement / Action	Negative Lead
  C2439-1		C2402B-10

• Measure:
  Click to display connectors

    Driver side footwell (floor) air discharge temperature sensor

  
  

  Positive Lead	Measurement / Action	Negative Lead
  C2436-B		C2402A-2

  
  Click to display connectors

    Driver side register (panel) air discharge temperature sensor

  
  

  Positive Lead	Measurement / Action	Negative Lead
  C2438-3		C2402A-2

  
  Click to display connectors

    Passenger side footwell (floor) air discharge temperature sensor

  
  

  Positive Lead	Measurement / Action	Negative Lead
  C2437-B		C2402A-2

  
  Click to display connectors

    Passenger side register (panel) air discharge temperature sensor

  
  

  Positive Lead	Measurement / Action	Negative Lead
  C2439-3		C2402A-2

• Disconnect the driver side footwell (floor) air discharge temperature sensor C2436

• Disconnect the driver side register (panel) air discharge temperature sensor C2438

• Disconnect the passenger side footwell (floor) air discharge temperature sensor C2437

• Disconnect the passenger side register (panel) air discharge temperature sensor C2439

• Measure:
  Click to display connectors

    Driver side footwell (floor) air discharge temperature sensor

  
  

  Positive Lead	Measurement / Action	Negative Lead
  C2436-A		C2436-B

  
  Click to display connectors

    Driver side register (panel) air discharge temperature sensor

  
  

  Positive Lead	Measurement / Action	Negative Lead
  C2438-1		C2438-3

  
  Click to display connectors

    Passenger side footwell (floor) air discharge temperature sensor

  
  

  Positive Lead	Measurement / Action	Negative Lead
  C2437-A		C2437-B

  
  Click to display connectors

    Passenger side register (panel) air discharge temperature sensor

  
  

  Positive Lead	Measurement / Action	Negative Lead
  C2439-1		C2439-3

• Ignition OFF.

• Disconnect and inspect all FCIM connectors.

• Repair:
  • corrosion (install new connector or terminals – clean module pins)
  • damaged or bent pins – install new terminals/pins
  • pushed-out pins – install new pins as necessary

• Reconnect all FCIM connectors. Make sure they seat and latch correctly.

• Operate the system and determine if the concern is still present.

Normal Operation and Fault Conditions

When an A/C request is received by the PCM , the A/C clutch is engaged when all of the following conditions are met:

• Excessively high or low refrigerant pressure from the A/C pressure transducer is not detected.
• Ambient air temperature is above approximately 0°C (32.0°F).
• Evaporator temperature is above approximately 1°C (33.8°F).
• Engine coolant temperature conditions are within normal parameters.
• Wide Open Throttle (WOT) condition is not present.
• Engine torque conditions are within normal parameters.
• Battery state of charge conditions are within normal parameters.

For more information on A/C request, REFER to: Climate Control System - System Operation and Component Description (412-00 Climate Control System - General Information, Description and Operation).

Possible Sources

• Wiring, terminals or connectors
• A/C system discharged or low refrigerant charge
• Network concerns
• A/C pressure transducer
• Evaporator temperature sensor
• Engine temperature sensors
• A/C compressor clutch air gap
• A/C compressor clutch field coil
• A/C clutch Smart FET control [non-serviceable, part of the BJB ]
• FCIM

Visual Inspection and Pre-checks

• Verify the A/C compressor belt is OK.
• Verify the A/C compressor clutch is engaged/operating.

NOTICE: Use the correct probe adapter(s) when making measurements. Failure to use the correct probe adapter(s) may cause damage to the connector.

NOTE: Some Powertrain Control Module (PCM) Diagnostic Trouble Codes (DTCs) may inhibit Air Conditioning (A/C) operation. If any Powertrain Control Module (PCM) Diagnostic Trouble Codes (DTCs) are retrieved, diagnose those first. Refer to the Master Diagnostic Trouble Code (DTC) Chart.

• Start the engine. Observe the outside temperature display for proper operation.

• On the HVAC controls, set the temperature to full cold, select PANEL and select the A/C button (indicator on).

• Ignition OFF.

• Wait 1 minute.

• Ignition ON.

• Using the FDRS diagnostic scan tool, follow the on screen prompts to reset the Outside Air Temperature (OAT)/Ambient Air Temperature (AAT) sensor data.
  REFER to: Reset the Outside Air Temperature Sensor Learned Values (412-00 Climate Control System - General Information, General Procedures).
  

• Start the engine.

• On the HVAC controls, set the temperature to full cold, select PANEL and select the A/C button (indicator on).

NOTE: Static refrigerant pressure, under perfect conditions, should approximately reflect ambient air temperature. Do not rely upon the static refrigerant pressure alone to determine if the system is properly charged. Refer to the current Ford Web Based Technical Training courses for basic HVAC system refrigerant operation.

• Ignition OFF.

• Connect a manifold gauge set.

• With a manifold gauge set connected, check for minimum A/C system pressure.

• Ignition ON.

• Using a diagnostic scan tool, carry out the network test.

NOTE: The following pinpoint test step is tested in ambient temperature of approximately 21.1°C (70°F). As ambient temperatures near 38°C (100.4°F), the pressure value difference increases above ± 15 psi (103 kPa) range.

• With a manifold gauge set connected, compare the pressure readings of the manifold gauge set and the

  Access the  PCM  and monitor the  ACP_PRESS (kPa)  PID

• Ignition OFF. Allow the vehicle exterior and interior to stabilize to ambient temperature. This can take a soak period of at least 6 hours.

• Ignition ON.

• Monitor and record the

  Access the  PCM  and monitor the  AAT (Deg C)  PID

• Monitor and record the

  Access the  FCIM  and monitor the  EVAP_TEMP (Deg C)  PID

NOTE: Compare multiple engine sensor readings to the ambient temperature to determine sensors are reading correctly. A faulty sensor can cause the Powertrain Control Module (PCM) to disable the Air Conditioning (A/C) with or without a Diagnostic Trouble Code (DTC).

• Monitor the temperature Parameter Identifications (PIDs) (as applicable):

  • Access the  PCM  and monitor the  AAT (Deg C)  PID

  • Access the  PCM  and monitor the  CAC_T (Deg C)  PID

  • Access the  PCM  and monitor the  CHT (Deg C)  PID

  • Access the  PCM  and monitor the  ECT (Deg C)  PID

  • Access the  PCM  and monitor the  IAT (Deg C)  PID

  • Access the  PCM  and monitor the  IAT2 (Deg C)  PID

• Access the  FCIM  and monitor the  CC_SW_AC  PID

• On the HVAC controls, select PANEL and then press the A/C button (indicator ON).

• Start the engine.

• Access the  PCM  and monitor the  AC_REQ  PID

• On the HVAC controls, select PANEL and then press the A/C button (indicator ON).

• Access the  PCM  and control the  ACC_CMD  PID

• Ignition OFF.

• Disconnect BJB C1035B and C1035C .

• Disconnect PCM C175B .

• Disconnect A/C clutch and A/C clutch field coil C100A .

• Ignition ON.

• Measure:
  Click to display connectors
  

  Positive Lead	Measurement / Action	Negative Lead
  C1035B-29		Ground

  
  Click to display connectors
  

  Positive Lead	Measurement / Action	Negative Lead
  C1035C-5		Ground

• Ignition OFF.

• Measure:
  Click to display connectors
  

  Positive Lead	Measurement / Action	Negative Lead
  C1035B-29		Ground

  
  Click to display connectors
  

  Positive Lead	Measurement / Action	Negative Lead
  C1035C-5		Ground

• Ignition OFF.

• Measure:
  Click to display connectors

    Input Circuit from Powertrain Control Module (PCM) to Body Control Module C (BCMC)

  
  

  Positive Lead	Measurement / Action	Negative Lead
  C1035B-29		C175B-44

• Measure:
  Click to display connectors
  

  Positive Lead	Measurement / Action	Negative Lead
  C100A-2		Ground

• Measure:
  Click to display connectors

    Output Circuit from Body Control Module C (BCMC) to the A/C Clutch

  
  

  Positive Lead	Measurement / Action	Negative Lead
  C1035C-5		C100A-1

• Connect PCM C175B .

• Connect BJB C1035B and C1035C .

• Connect A/C clutch and A/C clutch field coil C100A .

• Ignition ON.

• Using a diagnostic scan tool, Clear all Diagnostic Trouble Codes (DTCs). Carry Out the PCM self-test and the BCMC self-test.

• Ignition OFF.

• Wait one minute.

• Ignition ON.

• Access the  PCM  and control the  ACC_CMD  PID

• Measure the A/C compressor clutch air gap at 3 equally spaced locations between the clutch hub and the A/C compressor clutch pulley.
  REFER to: Air Conditioning (A/C) Clutch Air Gap Adjustment (412-00 Climate Control System - General Information, General Procedures).
  

• Ignition OFF.

• Disconnect and inspect all FCIM connectors.

• Repair:
  • corrosion (install new connector or terminals – clean module pins)
  • damaged or bent pins – install new terminals/pins
  • pushed-out pins – install new pins as necessary

• Reconnect all FCIM connectors. Make sure they seat and latch correctly.

• Operate the system and determine if the concern is still present.

NOTE: The Powertrain Control Module (PCM) strategy may disable the Air Conditioning (A/C) compressor operation. If the A/C compressor clutch can be commanded on using a diagnostic scan tool Powertrain Control Module (PCM) Parameter Identifications (PIDs) Active Commands, Powertrain Control Module (PCM) replacement will not resolve the condition.

• Diagnose the PCM not energizing the A/C clutch Smart FET using the suggestions in the table below.

  A/C Clutch Engagement is inhibited because strategy has not yet detected hardware that indicates vehicle is equipped with A/C

  A/C Clutch Engagement is inhibited because the strategy is operating in Ignition System Failure Mode

  A/C Clutch Engagement is inhibited because the (ECU) received a Request to Command the A/C Off

  A/C Clutch Engagement is inhibited because the engine has not yet reached a stable running mode after starting

  A/C Clutch Engagement is inhibited because the A/C Discharge (Head) Pressure is Too High

  A/C Clutch Engagement is inhibited because the Engine Coolant Temperature is Too High

  A/C Clutch Engagement is inhibited to Prevent Frost and Ice Build Up on the Evaporator

  A/C Clutch Engagement is inhibited to Prevent an Engine Stall during a Low Engine Speed condition

  A/C Clutch Engagement is inhibited to Protect the Compressor from a Compressor Over-speed condition

  A/C Clutch Engagement is inhibited to temporarily make more power available when Accelerator Pedal is Fully Depressed

  A/C Clutch Engagement is inhibited because Low A/C Refrigerant Charge has been detected

  A/C Clutch Engagement is inhibited to Protect the Compressor from Operating at Too Low of an Ambient Temperature

  A/C Clutch Engagement is inhibited due to Missing Climate Control Message

  A/C Clutch Engagement is inhibited because the strategy is operating in Failsafe Cooling Mode

  A/C Clutch Engagement is inhibited to Protect the Clutch from Damage because the Compressor Load and Speed are Too High

  A/C Clutch Engagement is inhibited by the off portion of the A/C Cycling Strategy invoked to manage High Engine Temperature

  A/C Clutch Engagement is inhibited due to Low Battery State of Charge

  A/C Clutch Engagement is inhibited to Protect the Variable Displacement Compressor from Operating at Too Low of a Temperature

  A/C Clutch Engagement is inhibited to improve Brake Booster Vacuum

  A/C Clutch Engagement is inhibited because Evaporator Temperature is sufficiently low and compressor was at minimum displacement

  A/C Clutch Engagement is inhibited (Disabled) because the Evaporator Temperature is sufficiently below the target temperature

  A/C Clutch Engagement is inhibited to satisfy A/C Clutch minimum off time

  A/C Clutch Engagement is inhibited Due to Request from Torque Control Strategy (to Temporarily Make More Power Available)

  A/C Clutch Engagement is inhibited to Prevent Engine Stalling

  A/C Clutch Engagement is inhibited Due to Request to Disable A/C from Stop-Start Strategy

  A/C Clutch Engagement is inhibited (Delayed) to make Power Available for Power Steering

  A/C Clutch Engagement Is Inhibited Due To State Of Auxiliary A/C Disable (Typically A Pressure Or Temperature) Switch 1 input

  A/C Clutch Engagement is inhibited due to state of auxiliary A/C Disable (Typically a Pressure or Temperature) Switch 2 input

Normal Operation and Fault Conditions

Control System Logic, REFER to: Climate Control System - System Operation and Component Description (412-00 Climate Control System - General Information, Description and Operation).

DTC Fault Trigger Conditions

Possible Sources

• Wiring, terminals or connectors
• A/C pressure transducer
• Evaporator temperature sensor
• FCIM
• PCM

NOTICE: Use the correct probe adapter(s) when making measurements. Failure to use the correct probe adapter(s) may damage the connector.

• Ignition ON.

• Make sure the HVAC controls are powered off.

• Using a diagnostic scan tool, clear the PCM Diagnostic Trouble Codes (DTCs).

• Using a diagnostic scan tool, carry out the PCM KOEO self-test.

• Ignition OFF.

• Disconnect A/C compressor clutch field coil C100A .

• Ignition ON.

• Measure:
  Click to display connectors
  

  Positive Lead	Measurement / Action	Negative Lead
  C100A-1		Ground

• Ignition OFF.

• Disconnect BJB C1035B .

• Measure:
  Click to display connectors
  

  Positive Lead	Measurement / Action	Negative Lead
  C1035B-29		Ground

• Ignition OFF.

• Allow the vehicle exterior and interior to stabilize to ambient temperature.

• Ignition ON.

• Using a diagnostic scan tool, view PCM Parameter Identifications (PIDs).

• Monitor and record the PCM AAT PID .

• Using a diagnostic scan tool, view the FCIM Parameter Identifications (PIDs).

• Monitor and record the FCIM (EVAP_TEMP) PID .

• Ignition ON.

• Using a diagnostic scan tool, view FCIM Parameter Identifications (PIDs).

• Monitor the CC_SW_AC PID .

• Select panel mode, press and release the A/C button (indicator off) on the HVAC controls.

• Using a diagnostic scan tool, view the PCM Parameter Identification (PIDs).

• With a manifold gauge set connected, compare the pressure readings of the manifold gauge set and the PCM Parameter Identification (PID) ACP_PRESS.

• Using a diagnostic scan tool, view PCM Parameter Identifications (PIDs).

• Monitor the AC_REQ PID .

• While in panel mode, release the A/C button (indicator off) on the HVAC controls.

• Ignition OFF.

• Disconnect FCIM C2402A and C2402B .

• Ignition ON.

• Using a diagnostic scan tool, view PCM Parameter Identifications (PIDs).

• Monitor the AC_REQ PID .

• Ignition OFF.

• Disconnect and inspect all FCIM connectors.

• Repair:
  • corrosion (install new connector or terminals – clean module pins)
  • damaged or bent pins – install new terminals/pins
  • pushed-out pins – install new pins as necessary

• Reconnect all FCIM connectors. Make sure they seat and latch correctly.

• Operate the system and determine if the concern is still present.

• Ignition OFF.

• Disconnect and inspect all PCM connectors.

• Repair:
  • corrosion (replace connector or terminals – clean module pins)
  • damaged or bent pins – replace terminals/pins
  • pushed-out pins – replace pins as necessary

• Reconnect all PCM connectors. Make sure they seat and latch correctly.

• Operate the system and verify the concern is still present.

Yes	CHECK OASIS for any applicable service articles: TSB , GSB , SSM or FSA . If a service article exists for this concern, DISCONTINUE this test and FOLLOW the service article instructions. If no service articles address this concern,    Click here to access Guided Routine (PCM).

Normal Operation and Fault Conditions

In-vehicle temperature and humidity sensor, REFER to: Climate Control System - System Operation and Component Description (412-00 Climate Control System - General Information, Description and Operation).

DTC Fault Trigger Conditions

Possible Sources

• Wiring, terminals or connectors
• In-vehicle temperature and humidity sensor
• FCIM

NOTICE: Use the correct probe adapter(s) when making measurements. Failure to use the correct probe adapter(s) may damage the connector.

• Ignition OFF.

• Disconnect FCIM C2402A and C2402B .

• Ignition ON.

• Measure:
  Click to display connectors
  

  Positive Lead	Measurement / Action	Negative Lead
  C910-1		Ground
  C910-2		Ground
  C910-3		Ground
  C910-4		Ground
  C910-5		Ground
  C910-6		Ground

• Ignition OFF.

• Measure:
  Click to display connectors
  

  Positive Lead	Measurement / Action	Negative Lead
  C910-1		Ground
  C910-2		Ground
  C910-3		Ground
  C910-4		Ground
  C910-5		Ground
  C910-6		Ground

• Disconnect In-vehicle temperature and humidity sensor C910 .

• Measure:
  Click to display connectors
  

  Positive Lead	Measurement / Action	Negative Lead
  C910-3		C2402A-3
  C910-5		C2402A-2

  
  Click to display connectors
  

  Positive Lead	Measurement / Action	Negative Lead
  C910-1		C2402B-29
  C910-2		C2402B-27
  C910-4		C2402B-19
  C910-6		C2402B-9

• Disconnect Drivers side temperature door actuator C2091 .

• Disconnect Passenger side temperature door actuator C2092 .

• Disconnect Air inlet door actuator C289 .

• Disconnect Air distribution door actuator C236 .

• Disconnect Rear air distribution door actuator C3044 .

• Disconnect Rear temperature door actuator C3004 .

• Measure:
  Click to display connectors
  

  Positive Lead	Measurement / Action	Negative Lead
  C910-1		C910-2
  C910-1		C910-3
  C910-1		C910-4
  C910-1		C910-5
  C910-1		C910-6
  C910-2		C910-3
  C910-2		C910-4
  C910-2		C910-5
  C910-2		C910-6
  C910-3		C910-4
  C910-3		C910-5
  C910-3		C910-6
  C910-4		C910-5
  C910-4		C910-6
  C910-5		C910-6

• Ignition OFF.

• Inspect the disconnected connectors.

• Repair:
  • corrosion (install new connector or terminals – clean module pins)
  • damaged or bent pins – install new terminals/pins
  • pushed-out pins – install new pins as necessary

• Reconnect all disconnected connectors. Make sure they seat and latch correctly.

• Operate the system and determine if the concern is still present.

• Ignition OFF.

• Disconnect and inspect all FCIM connectors.

• Repair:
  • corrosion (install new connector or terminals – clean module pins)
  • damaged or bent pins – install new terminals/pins
  • pushed-out pins – install new pins as necessary

• Reconnect all FCIM connectors. Make sure they seat and latch correctly.

• Operate the system and determine if the concern is still present.

Normal Operation and Fault Conditions

Sunload Sensor, REFER to: Climate Control System - System Operation and Component Description (412-00 Climate Control System - General Information, Description and Operation).

DTC Fault Trigger Conditions

Possible Sources

• Wiring, terminals or connectors
• Sunload sensor
• FCIM

NOTICE: Use the correct probe adapter(s) when making measurements. Failure to use the correct probe adapter(s) may damage the connector.

• Ignition OFF.

• Disconnect Autolamp/sunload sensor C286 .

• Disconnect FCIM C2402A and C2402B .

• Disconnect BCM C2280B .

• Ignition ON.

• Measure:
  Click to display connectors
  

  Positive Lead	Measurement / Action	Negative Lead
  C286-1		Ground
  C286-2		Ground
  C286-3		Ground
  C286-4		Ground

• Ignition OFF.

• Measure:
  Click to display connectors
  

  Positive Lead	Measurement / Action	Negative Lead
  C286-1		Ground
  C286-2		Ground
  C286-3		Ground
  C286-4		Ground

• Measure:
  Click to display connectors
  

  Positive Lead	Measurement / Action	Negative Lead
  C286-1		C2402B-22
  C286-3		C2402B-21

  
  Click to display connectors
  

  Positive Lead	Measurement / Action	Negative Lead
  C286-2		C2280B-24
  C286-4		C2280B-22

• Measure:
  Click to display connectors
  

  Positive Lead	Measurement / Action	Negative Lead
  C286-1		C286-2
  C286-1		C286-3
  C286-1		C286-4
  C286-2		C286-3
  C286-2		C286-4
  C286-3		C286-4

• Ignition OFF.

• Disconnect and inspect all FCIM connectors.

• Repair:
  • corrosion (install new connector or terminals – clean module pins)
  • damaged or bent pins – install new terminals/pins
  • pushed-out pins – install new pins as necessary

• Reconnect all FCIM connectors. Make sure they seat and latch correctly.

• Operate the system and determine if the concern is still present.

Normal Operation and Fault Conditions

Evaporator Temperature Sensor, REFER to: Climate Control System - System Operation and Component Description (412-00 Climate Control System - General Information, Description and Operation).

DTC Fault Trigger Conditions

Possible Sources

• Wiring, terminals or connectors
• Evaporator temperature sensor
• FCIM

NOTICE: Use the correct probe adapter(s) when making measurements. Failure to use the correct probe adapter(s) may damage the connector.

• Ignition OFF.

• Allow the vehicle exterior and interior to stabilize to ambient temperature.

• Ignition ON.

• Using a diagnostic scan tool, view the PCM Parameter Identification (PIDs).

• Monitor and record the PCM PARAMETER IDENTIFICATION AAT.

• Using a diagnostic scan tool, view the FCIM Parameter Identification (PIDs).

• Monitor and record the FCIM PARAMETER IDENTIFICATION EVAP_TEMP.

• Disconnect FCIM C2402A and C2402B .

• Ignition ON.

• Measure:
  Click to display connectors
  

  Positive Lead	Measurement / Action	Negative Lead
  C2402A-2		Ground
  C2402A-19		Ground

• Ignition OFF.

• Measure:
  Click to display connectors
  

  Positive Lead	Measurement / Action	Negative Lead
  C2402A-2		Ground
  C2402A-19		Ground

NOTE: Access to the connector in the following step is difficult. Before carrying out this step, visually inspect the harness for obvious damage. If no damage is evident, proceed with the test.

• Disconnect Evaporator temperature sensor C296 .

• Measure:
  Click to display connectors
  

  Positive Lead	Measurement / Action	Negative Lead
  C2402A-2		C296-1
  C2402A-19		C296-2

• Measure:
  Click to display connectors
  

  Positive Lead	Measurement / Action	Negative Lead
  C296-1		C296-2

• Ignition OFF.

• Disconnect and inspect all FCIM connectors.

• Repair:
  • corrosion (install new connector or terminals – clean module pins)
  • damaged or bent pins – install new terminals/pins
  • pushed-out pins – install new pins as necessary

• Reconnect all FCIM connectors. Make sure they seat and latch correctly.

• Operate the system and determine if the concern is still present.

Normal Operation and Fault Conditions

Reference voltage is supplied to the climate control actuators and one sensor from the FCIM on one common circuit and the signal returns to the FCIM on one common circuit. All components that share these two circuits are listed in this pinpoint test. Access to these components are difficult.

DTC Fault Trigger Conditions

Possible Sources

• Wiring, terminals or connectors
• FCIM

NOTICE: Use the correct probe adapter(s) when making measurements. Failure to use the correct probe adapter(s) may damage the connector.

• Ignition ON.

• Using a diagnostic scan tool, perform FCIM self-test.

• Ignition OFF.

• Disconnect FCIM C2402A and C2402B .

• Measure:
  Click to display connectors
  

  Positive Lead	Measurement / Action	Negative Lead
  C2402A-3		Ground

• Ignition OFF.

• Measure:
  Click to display connectors
  

  Positive Lead	Measurement / Action	Negative Lead
  C2402A-3		C2402A-2

• Measure:
  Click to display connectors
  

  Positive Lead	Measurement / Action	Negative Lead
  C2402A-3		C2402A-2

• While measuring the resistance, disconnect the following components one at a time, in order. Stop disconnecting components if the measured resistance rises above 200 ohms.
  • Air distribution door actuator C236
  • Air inlet door actuator C289
  • Driver side temperature door actuator C2091
  • Passenger side temperature door actuator C2092
  • In-vehicle temperature and humidity sensor C910

• Ignition OFF.

• Disconnect FCIM C2402A and C2402B .

• Ignition ON.

• Measure:
  Click to display connectors
  

  Positive Lead	Measurement / Action	Negative Lead
  C2402A-3		Ground

• Ignition OFF.

• Disconnect and inspect all FCIM connectors.

• Repair:
  • corrosion (install new connector or terminals – clean module pins)
  • damaged or bent pins – install new terminals/pins
  • pushed-out pins – install new pins as necessary

• Reconnect all FCIM connectors. Make sure they seat and latch correctly.

• Operate the system and determine if the concern is still present.

Normal Operation and Fault Conditions

When the HVAC control module determines it is necessary to activate the A/C compressor, either due to driver request or due to automatic climate control settings, a message is sent over the MS-CAN to the GWM . The GWM sends this message over the HS-CAN1 to the BCM and to the PCM .

An internal failure of the PCM , BCM , HVAC control module or GWM ; or a failure in the MS-CAN or HS-CAN1 causes the PCM to set a DTC . For a full list of the messages, the communication networks and the modules involved, REFER to: Controller Area Network (CAN) Module Communications Network - System Operation and Component Description (418-00A Controller Area Network (CAN) Module Communications Network, Description and Operation).

DTC Fault Trigger Conditions

Possible Sources

• Network concerns
• BCM
• PCM
• FCIM

• Ignition ON.

• Verify there is an observable symptom present.

• Using a diagnostic scan tool, carry out the Network Test.

• Start the engine.

• Using a diagnostic scan tool, monitor the PCM AC_REQ PID .

• On the HVAC controls, select PANEL mode, then press the A/C button (indicator ON).

• Using a diagnostic scan tool, monitor the FCIM CC_SW_AC PID while pressing and releasing the A/C button.

• Ignition OFF.

• Disconnect and inspect all FCIM connectors.

• Repair:
  • corrosion (install new connector or terminals – clean module pins)
  • damaged or bent pins – install new terminals/pins
  • pushed-out pins – install new pins as necessary

• Reconnect all FCIM connectors. Make sure they seat and latch correctly.

• Operate the system and determine if the concern is still present.

• Ignition OFF.

• Disconnect and inspect all BCM electrical connectors.

• Repair:
  • corrosion (install new connector or terminals – clean module pins)
  • damaged or bent pins – install new terminals/pins
  • pushed-out pins – install new pins as necessary

• Reconnect all BCM electrical connectors. Make sure they seat and latch correctly.

• Operate the system and determine if the concern is still present.

• Ignition OFF.

• Disconnect and inspect all PCM electrical connectors.

• Repair:
  • corrosion (install new connector or terminals – clean module pins)
  • damaged or bent pins – install new terminals/pins
  • pushed-out pins – install new pins as necessary

• Reconnect all PCM electrical connectors. Make sure they seat and latch correctly.

• Operate the system and determine if the concern is still present.

Yes	CHECK OASIS for any applicable service articles: TSB , GSB , SSM or FSA . If a service article exists for this concern, DISCONTINUE this test and FOLLOW the service article instructions. If no service articles address this concern,    Click here to access Guided Routine (PCM).

Normal Operation and Fault Conditions

Cabin Heater Coolant Pump, REFER to: Climate Control System - System Operation and Component Description (412-00 Climate Control System - General Information, Description and Operation).

DTC Fault Trigger Conditions

Possible Sources

• Wiring, terminals or connectors
• Low coolant or air in the coolant system
• Cabin heater coolant pump
• PCM

Visual Inspection and Pre-checks

• Make sure BJB fuse 8 (20A) is OK.

NOTE: Allow the engine drivetrain to cool before checking the coolant level.

• Make sure that the vehicle is on a level surface.

• Make sure that the steering wheel is set to the straight ahead position.

• Ignition OFF.

• Visually inspect the engine coolant level at the degas bottle.

• Ignition ON.

• Using a diagnostic scan tool, CARRY OUT the PCM self-test. Record the PCM Diagnostic Trouble Codes (DTCs). CLEAR all PCM Diagnostic Trouble Codes (DTCs).

• Using the diagnostic scan tool, active command the cabin heater coolant pump on and allow it to run for a minimum of 5 minutes and monitor the status of the cabin heater coolant pump status PID . Confirm if the cabin heater coolant pump is running by feeling or hearing the pump for vibration.

• Access the  PCM  and control the  COOLANT_PMP_A  PID

• Access the  PCM  and monitor the  COOLPMP_A_STAT  PID

• Disconnect BJB Fuse 8 (20A).

• Disconnect PCM C175E .

• Disconnect Cabin heater coolant pump C163 .

• Ignition ON.

• Measure:
  Click to display connectors
  

  Positive Lead	Measurement / Action	Negative Lead
  C163-2		Ground
  C163-3		Ground

• Ignition OFF.

• Measure:
  Click to display connectors
  

  Positive Lead	Measurement / Action	Negative Lead
  C163-2		Ground
  C163-3		Ground

• Measure:
  Click to display connectors
  

  Positive Lead	Measurement / Action	Negative Lead
  C163-1		Ground

  
  Click to display connectors
  

  Positive Lead	Measurement / Action	Negative Lead
  C163-2		BJB fuse 8 (20A) cavity, component side

  
  Click to display connectors
  

  Positive Lead	Measurement / Action	Negative Lead
  C163-3		C175E-16

• Ignition OFF.

• Disconnect Cabin heater coolant pump C163 .

• Repair:
  • corrosion (replace connector or terminals – clean module pins)
  • damaged or bent pins – replace terminals/pins
  • pushed-out pins – replace pins as necessary

• Connect all disconnected connectors. Make sure they seat and latch correctly.

• Ignition ON.

• Using a diagnostic scan tool, CLEAR all PCM Diagnostic Trouble Codes (DTCs) and CARRY OUT the PCM self-test.

• Using the diagnostic scan tool, active command the cabin heater coolant pump on and allow it to run for a minimum of 5 minutes and monitor the status of the cabin heater coolant pump status PID . Confirm if the cabin heater coolant pump is running by feeling or hearing the pump for vibration.

• Access the  PCM  and control the  COOLANT_PMP_A  PID

• Access the  PCM  and monitor the  COOLPMP_A_STAT  PID

• Ignition OFF.

• Disconnect and inspect the PCM connectors.

• Repair:
  • corrosion (replace connector or terminals – clean module pins)
  • damaged or bent pins – replace terminals/pins
  • pushed-out pins – replace pins as necessary

• Connect the PCM connectors. Make sure they seat and latch correctly.

• Operate the system and verify the concern is still present.

Yes	CHECK OASIS for any applicable service articles: TSB , GSB , SSM or FSA . If a service article exists for this concern, DISCONTINUE this test and FOLLOW the service article instructions. If no service articles address this concern,    Click here to access Guided Routine (PCM).

Normal Operation and Fault Conditions

Voltage is supplied to the rear blower motor relay switched contact and the relay coil from the BJB . The relay coil control circuit is internal to the BJB and voltage is delivered to the rear blower motor speed control. Power and ground for the rear blower motor is provided by the rear blower motor speed control. The FCIM sends a PWM signal to the rear blower motor speed control to control the rear blower speed. The rear blower motor relay is a non serviceable part of the printed circuit board on the BJB .

DTC Fault Trigger Conditions

Possible Sources

• Network concerns
• Wiring, terminals or connectors
• Rear blower motor speed control
• FCIM

Visual Inspection and Pre-checks

• Inspect BJB fuse 88 (40A)

NOTICE: Use the correct probe adapter(s) when making measurements. Failure to use the correct probe adapter(s) may damage the connector.

• Ignition OFF.

• Disconnect FCIM C2402A, C2402B and C2402C .

• Disconnect Rear blower motor speed control C4343A .

• Ignition ON.

• Measure:
  Click to display connectors
  

  Positive Lead	Measurement / Action	Negative Lead
  C2402C-18		Ground

• Ignition OFF.

• Measure:
  Click to display connectors
  

  Positive Lead	Measurement / Action	Negative Lead
  C4343A-3		C2402C-18
  C4343A-5		Ground

  
  Click to display connectors
  

  Positive Lead	Measurement / Action	Negative Lead
  C4343A-6		BJB fuse 88 (40A) socket (component side)

• Measure:
  Click to display connectors
  

  Positive Lead	Measurement / Action	Negative Lead
  C4343A-3		C4343A-5
  C4343A-3		C4343A-6
  C4343A-5		C4343A-6