Lincoln Navigator: Voltage Converter/Inverter / Direct Current/Alternating Current (DC/AC) Inverter. Diagnosis and Testing

Inspection and Verification

Before diagnosing or repairing the Direct Current/Alternating Current (DC/AC) Inverter system refer to the Owner's Literature and
REFER to: Direct Current/Alternating Current (DC/AC) Inverter - System Operation and Component Description (414-05 Voltage Converter/Inverter, Description and Operation).
for proper system operation.

DTC Chart

Diagnostics in this manual assume a certain skill level and knowledge of Ford-specific diagnostic practices.
REFER to: Diagnostic Methods (100-00 General Information, Description and Operation).

  Body Control Module (BCM) DTC Chart

Symptom Chart(s)

Symptom Chart: Direct Current/Alternating Current (DC/AC) Inverter

Diagnostics in this manual assume a certain skill level and knowledge of Ford-specific diagnostic practices.
REFER to: Diagnostic Methods (100-00 General Information, Description and Operation).

Pinpoint Tests

Diagnostics in this manual assume a certain skill level and knowledge of Ford-specific diagnostic practices.
REFER to: Diagnostic Methods (100-00 General Information, Description and Operation).

No Power at the AC Power Point or the AC Power Point LED Indicator Flashes with the Key in the ON Position

Refer to Wiring Diagrams Cell 44 for schematic and connector information.

Normal Operation and Fault Conditions

The engine must be started for the AC outlet to begin to operate.
REFER to: Direct Current/Alternating Current (DC/AC) Inverter - System Operation and Component Description (414-05 Voltage Converter/Inverter, Description and Operation).

NOTE: The electrical device that is powered by the AC power point must not exceed 150 watts.

NOTE: If the LED is flashing, the AC power point may be overloaded, overheated or shorted. Unplug the electrical device from the AC power point and cycle the ignition. Refer to the Owner's Literature to determine if the electrical device is appropriate for the AC power point.

  Diagnostic Trouble Code (DTC) Fault Trigger Conditions

Possible Sources

• Fuse(s)
• Direct current/alternating current (DC/AC) inverter
• AC power point
• Wiring, terminals or connectors

Visual Inspection and Diagnostic Pre-checks

• Verify that any device being used in the AC outlet is rated at less than 150 watts.
• Verify the AC outlet is not being used with the engine off for a period longer than 13 minutes without starting the engine or cycling the ignition.
• Verify the cabin temperature is less than 75ºC (167ºF).
• Verify the BCM fuse 23 (10A) is OK.
• Verify the BJB fuse 41 (50A) is OK.
• Inspect the AC outlet for damage.

The AC Power Point LED Indicator is Never On

Refer to Wiring Diagrams Cell 44 for schematic and connector information.

Normal Operation and Fault Conditions

The engine must be started for the AC outlet to begin to operate. The DC/AC inverter supplies 12V DC and ground to the indicator LED .
REFER to: Direct Current/Alternating Current (DC/AC) Inverter - System Operation and Component Description (414-05 Voltage Converter/Inverter, Description and Operation).

Possible Sources

• Fuse(s)
• Direct current/alternating current (DC/AC) inverter
• AC power point
• Wiring, terminals or connectors

Visual Inspection and Diagnostic Pre-checks

• Verify the BCM fuse 23 (10A) is OK.
• Verify the BJB fuse 41 (50A) is OK.
• Inspect the AC outlet for damage.

The AC Power Point Turns Off After 13 Minutes

Refer to Wiring Diagrams Cell 44 for schematic and connector information.

Normal Operation and Fault Conditions

The DC / AC inverter receives a signal from the BCM over the LIN whenever the engine is running. If the DC / AC inverter does not receive this message for 13 minutes, the inverter stops supplying 110 volts to the power outlet and the LED indicator flashes. The system can be reset by cycling the ignition from ON to OFF and back to ON, however the system only operates for another 13 minutes unless the signal is received from the BCM that the engine is running.

  Diagnostic Trouble Code (DTC) Fault Trigger Conditions

Possible Sources

• Wiring, terminals or connectors
• DC / AC inverter
• BCM

Visual Inspection and Diagnostic Pre-checks

• Verify the concern by monitoring the AC outlet LED indicator for 13 minutes with the engine running. If the LED indicator starts to flash after 13 minutes, continue to the pinpoint test. If the system continues to operate normally after 13 minutes, make sure the customer is aware of the DC / AC inverter time-out function.