Lincoln Navigator: Front Seats / Front Seats - System Operation and Component Description. Description and Operation

System Operation

System Diagram - Driver Memory Seat

*.sttxt { visibility: hidden; } *.stcallout { visibility: visible; } E374205 1 PCM 2 BCM 3 Ignition Switch 4 GWM 5 Memory SET Switch 6 Driver Seat Control Switch 7 DSM 8 DDM 9 Memory Power Seat Motors 10 Front Head Restraint 11 SCMG

Item	Description
1	PCM
2	BCM
3	Ignition Switch
4	GWM
5	Memory SET Switch
6	Driver Seat Control Switch
7	DSM
8	DDM
9	Memory Power Seat Motors
10	Front Head Restraint
11	SCMG

Network Message Chart - Driver Memory Seat

  DSM Network Input Messages

Broadcast Message	Originating Module	Message Purpose
Key-in-ignition status	BCM	Provides the ignition status. This input is used for the easy entry/exit feature.
Personality recall	BCM	When the personality recall command is received from the BCM , the DSM stores or recalls the associated memory seat position (1, 2 or 3). If a RKE transmitter has been programmed to a memory position, this input is used to recall the associated memory seat position.
Memory seat switch status	DDM	When the memory set switch (1, 2 or 3) is activated, the DDM sends this message to the DSM , which then stores or recalls the associated memory seat position.

  SCMG Network Input Messages

Broadcast Message	Originating Module	Message Purpose
Easy entry/exit	DSM	This input is used for the easy entry/exit feature.
Seat memory command	DSM	When the personality recall command is received from the DSM , the SCMG stores or recalls the associated memory seat bladder pressures and multi-contour adjust/massage setting for personality (1, 2 or 3). If a RKE transmitter has been programmed to a memory position, this input is used to recall the associated memory seat settings.

System Diagram - Passenger Memory Seat

*.sttxt { visibility: hidden; } *.stcallout { visibility: visible; } E374206 1 Memory SET Switch 2 Passenger Seat Control Switch 3 SCMB 4 PDM 5 Memory Power Seat Motors 6 Front Head Restraint 7 SCMH 8 Redundant Seat Control Switch

Item	Description
1	Memory SET Switch
2	Passenger Seat Control Switch
3	SCMB
4	PDM
5	Memory Power Seat Motors
6	Front Head Restraint
7	SCMH
8	Redundant Seat Control Switch Comment: If Equipped

Network Message Chart - Passenger Seat

  SCMB Network Input Messages

Broadcast Message	Originating Module	Message Purpose
Memory seat switch status	PDM	If equipped with a memory seat, when the memory set switch (1, 2 or 3) is activated, the PDM sends this message to the SCMB , which then stores or recalls the associated memory seat position.

  SCMH Network Input Messages

Broadcast Message	Originating Module	Message Purpose
Seat memory command	SCMB	When the personality recall command is received from the SCMB , the SCMH stores or recalls the associated memory seat bladder pressures and multi-contour adjust/massage setting for personality (1, 2 or 3).

System Diagram - Heated/Ventilated Seats

*.sttxt { visibility: hidden; } *.stcallout { visibility: visible; } E374207 1 FCIM 2 Cushion Heater Mat 3 Cushion Temp Sensor 4 Backrest Heater Mat 5 SCME 6 SCMF 7 Cushion and Backrest Blower Motors 8 Cushion and Backrest Blower Motors 9 Cushion Heater Mat 10 Cushion Temp Sensor 11 Backrest Heater Mat

Item	Description
1	FCIM
2	Cushion Heater Mat Comment: Driver Seat
3	Cushion Temp Sensor Comment: Driver Seat
4	Backrest Heater Mat Comment: Driver Seat
5	SCME
6	SCMF
7	Cushion and Backrest Blower Motors Comment: Driver Seat
8	Cushion and Backrest Blower Motors Comment: Passenger Seat
9	Cushion Heater Mat Comment: Passenger Seat
10	Cushion Temp Sensor Comment: Passenger Seat
11	Backrest Heater Mat Comment: Passenger Seat

Network Message Chart - Heated/Ventilated Seats

  SCME / SCMF Network Input Messages

Broadcast Message	Originating Module	Message Purpose
Climate control requests	FCIM	The climate control requests message contains the heated/ventilated seat request information.

  FCIM Network Input Messages

Broadcast Message	Originating Module	Message Purpose
Climate control button status	SCME / SCMF	The SCME / SCMF provides this message to the FCIM for the purpose of updating the displayed status of the heated/ventilated seat buttons on the FCIM .

System Diagram - Multi-Contour Front Seats

*.sttxt { visibility: hidden; } *.stcallout { visibility: visible; } E374208 1 GWM 2 Front Seat Cushion Adjuster 3 APIM 4 SCMG 5 SCMH 6 Front Seat Power Lumbar Assembly 7 Front Multi-Contour Control Pump 8 Touchscreen 9 OCSM 10 Front Seat Backrest Adjuster 11 Front Seat Cushion Adjuster 12 Front Seat Power Lumbar Assembly 13 Front Multi-Contour Control Pump 14 Front Seat Backrest Adjuster

Item	Description
1	GWM
2	Front Seat Cushion Adjuster Comment: Driver Seat
3	APIM
4	SCMG
5	SCMH
6	Front Seat Power Lumbar Assembly Comment: Driver Seat
7	Front Multi-Contour Control Pump Comment: Driver Seat
8	Touchscreen
9	OCSM
10	Front Seat Backrest Adjuster Comment: Driver Seat
11	Front Seat Cushion Adjuster Comment: Passenger Seat
12	Front Seat Power Lumbar Assembly Comment: Passenger Seat
13	Front Multi-Contour Control Pump Comment: Passenger Seat
14	Front Seat Backrest Adjuster Comment: Passenger Seat

Network Message Chart - Multi-Contour Front Seats

  FDIM Network Input Messages

Broadcast Message	Originating Module	Message Purpose
Multi-contour seat switch status	SCMG / SCMH	The SCMG / SCMH provides this message to the FDIM for the purpose of updating the displayed status of the multi-contour seat buttons on the FDIM (touchscreen).
Driver/passenger multi-contour seat position data	SCMG / SCMH	The SCMG and SCMH provide this message to the FDIM for the purpose of updating the displayed pressure of the multi-contour seat bladders and bolster pairs on the FDIM (touchscreen).

  SCMG / SCMH Network Input Messages

Broadcast Message	Originating Module	Message Purpose
Multi-contour seat request	FDIM	The multi-contour seat request message contains the requested multi-contour function(s) from the touchscreen.

  SCMH Network Input Messages

Broadcast Message	Originating Module	Message Purpose
OCS data	OCSM	The OCSM provides status of whether the passenger seat is occupied or not so that the SCMH can disable the massage function from operating when the passenger seat is unoccupied.

Driver Power Seat Operation

The driver seat control switch communicates over a LIN to the DSM . When the DSM receives the input from the seat control switch, the DSM provides power to the appropriate seat motor until the input is removed. All of the the seat motor circuits are normally grounded through the DSM . The DSM internally switches the appropriate circuit from ground to voltage to operate the motors. The DSM

As the seat is adjusted, the DSM monitors fluctuations of the motor current (ripple count for DC (direct current) motors) to determine the current seat position. The DSM removes voltage from the motor upon termination of the seat control switch input or if the DSM does not detect movement from the motor. If equipped with a power head restraint, the DSM does not directly control (or monitor) the head restraint position. For additional information, refer to Driver Front Head Restraint Operation.

DSM Hard Stop/Soft Stop

A hard stop occurs when one of the memory seat track or backrest axes physically reach the end of travel and can go no further. A soft stop occurs when the seat stops before it physically reaches the end of travel. The hard stop is set by seat design and cannot be changed or adjusted. The soft stop is set by the DSM . The seat track axes are forward/rearward, front up/down and rear up/down. The backrest axis is recline forward/backward. If equipped with 24-way or 30-way seats, there are additional axes for the cushion extension (forward/rearward). To prevent unnecessary stress on the seat and motors, the DSM sets soft stop positions, 2 for each axis of motion. The DSM uses a preset distance from the hard stop to determine where the soft stop occurs. When an axis reaches the hard stop and the switch is held for approximately one second, the DSM establishes the soft stop for that axis in that direction.

Driver Front Head Restraint Operation

The DSM provides power and ground to the front head restraint. The front head restraint contains a front head restraint motor (up/down) and a front head restraint motor (forward/rearward). The driver seat control switch communicates over a LIN to the front head restraint. When the front head restraint receives the input from the seat control switch, the front head restraint internally switches the appropriate circuit from ground to voltage to operate the motors.

As the driver front head restraint is adjusted, the front head restraint monitors the motor position to record the current head restraint position. When storing or recalling a memory position, the DSM and driver front head restraint communicate through the LIN .

Easy Entry/Exit

The easy entry/exit feature is a function of the DSM that moves the driver seat back approximately 50.8 mm (2 in) (unless seat is already positioned at or near the end of travel) when the ignition is turned off. The DSM receives ignition off status over the MS-CAN and operates the driver seat rearward. The DSM cancels this operation if a valid input command is received from the driver seat control switch, memory set switch, exterior mirror control switch or if the function has been disabled.

The DSM records the current seat positions before operating the seat for an easy exit operation. During easy entry operation (when the ignition is turned on), the seat is returned to the recorded seat position prior to the easy exit operation. Easy entry operation is cancelled if a valid input command is received by the DSM . A memory position recall using the memory set switch also overrides the easy exit operation.

The easy entry/exit feature can be enabled/disabled on the message center. For information on programming vehicle settings in the message center, refer to the Owner's Literature.

Passenger Power Seat Operation

The passenger seat control switch communicates over a LIN to the SCMB . When the SCMB receives the input from the seat control switch, the SCMB provides power to the appropriate seat motor until the input is removed. All of the the seat motor circuits are normally grounded through the SCMB . The SCMB internally switches the appropriate circuit from ground to voltage to operate the motors. The SCMB

As the seat is adjusted, the SCMB monitors fluctuations of the motor current (ripple count for DC (direct current) motors) to determine the current seat position. The SCMB removes voltage from the motor upon termination of the seat control switch input or if the SCMB does not detect movement from the motor. If equipped with a power head restraint, the SCMB does not directly control (or monitor) the head restraint position. For additional information, refer to Passenger Front Head Restraint Operation.

If equipped, when the redundant passenger seat control switch is activated, it provides a voltage signal to the SCMB . This voltage signal causes the SCMB to power the appropriate motor until the input is removed.

SCMB Hard Stop/Soft Stop

A hard stop occurs when one of the memory seat track or backrest axes physically reach the end of travel and can go no further. A soft stop occurs when the seat stops before it physically reaches the end of travel. The hard stop is set by seat design and cannot be changed or adjusted. The soft stop is set by the SCMB . The seat track axes are forward/rearward, front up/down and rear up/down. The backrest axis is recline forward/backward. There are additional axes for the cushion extension (forward/rearward) and head restraint (forward/rearward and up/down). To prevent unnecessary stress on the seat and motors, the SCMB sets soft stop positions, 2 for each axis of motion. The SCMB uses a preset distance from the hard stop to determine where the soft stop occurs. When an axis reaches the hard stop and the switch is held for approximately one second, the SCMB establishes the soft stop for that axis in that direction.

Passenger Front Head Restraint Operation

The SCMB provides power and ground to the front head restraint. The front head restraint contains a front head restraint motor (up/down) and a front head restraint motor (forward/rearward). The passenger seat control switch communicates over a LIN to the front head restraint. When the front head restraint receives the input from the seat control switch, the front head restraint internally switches the appropriate circuit from ground to voltage to operate the motors.

As the passenger front head restraint is adjusted, the front head restraint monitors the motor position to record the current head restraint position. When storing or recalling a memory position, the SCMB and passenger front head restraint communicate through the LIN .

Heated/Ventilated Seat Operation

The driver and passenger heated/ventilated seat buttons are selected from the FCIM . The heated/ventilated seat system functions independently from the vehicle's climate control system.

The driver front seat is controlled by the SCME (integral to the DSM . The passenger front seat is controlled by the SCMF (integral to the SCMB .

Heat Operation

• When activated, the SCME / SCMF supplies voltage to the selected seat heater circuit. Each seat cushion heater mat and backrest heater mat is connected in a series circuit to the SCME / SCMF and powered by the output circuit for that seat. The SCME / SCMF monitors inputs from a temperature sensor located in each seat cushion heater mat, and maintains seat temperature by cycling the heater circuits on/off. The heated seat remains ON until the heated seat switch button is pressed to cycle the SCME / SCMF OFF or the ignition is set to OFF.

Ventilation Operation

• The seat cushion and backrest are each equipped with a blower motor assembly. Each blower motor draws air through the surface of the cushion and backrest through the foam. Once the system is activated, the SCME / SCMF controls the blower speed dependant on the heated/ventilated seat settings.

Remote Start Climate Operation

Different climate control modes/preferences can be selected when the vehicle is started using the remote start feature. This can be accessed through the message center and/or touchscreen. For additional information on how to set the remote start preferences, refer to the Owner's Literature. When the driver seat and/or passenger seat is set to AUTO mode, the driver/passenger heated seat activates in full heat mode when the outside temperature is less than approximately 0° C (32° F) and full cool mode (heated/ventilated seats only) when outside temperature is greater than approximately 27° C (80° F) any time the vehicle is started using the remote start feature. No heated/ventilated seat adjustments are recognized during remote start operation. Once the ignition is cycled ON, the heated/ventilated seat turns off.

Multi-Contour Seat Operation

The multi-contour seats are independently controlled by the FDIM (touchscreen). The driver and passenger front seats each contain a total of 21 inflatable bladders: 4 cushion bladders, 2 cushion side bolsters, 3 backrest lumbar bladders, 10 upper backrest bladders and 2 backrest side bolsters. The pressures for the lumbar bladders, cushion bolster pair and backrest bolster pair are displayed on the FDIM as a percentage of the maximum pressure.

There are 2 modes of operation: adjust or massage. Adjust mode allows pressure changes in one of the 3 lumbar bladders and 2 sets of bolsters to be inflated or deflated to a desirable feel. Massage mode provides a sequence of inflation and deflation of the upper backrest, lumbar and cushion bladders to simulate a massage motion.

NOTE: Refer to the Owner's Literature for information how to select the various modes using the touchscreen buttons.

When in Adjust mode:

• Each tap of the up or down buttons cycles through the following bladders and bolsters: Upper lumbar, middle lumbar, lower lumbar, back bolster and cushion bolster.
• When the inflate/deflate buttons are pressed (or held), the pressure increases or decreases for the currently selected bladder or bolster pair.
• Pressing the mode select button toggles the seat to massage mode. The ignition must be on for massage mode to function.

NOTE: The passenger multi-contour seat will not enter massage mode unless the passenger seat is occupied (or has greater than 9.07 kg (20 lb) on the seat cushion).

When in Massage mode:

• Each tap of the up or down buttons cycles between backrest and cushion massage modes.
• Each tap of the inflate/deflate buttons cycles between the intensity levels of massage (off, low and high).
• Pressing the mode select button toggles the seat to adjust mode. Middle lumbar bladder will be selected automatically.

Each multi-contour seat can be restored to the original factory settings by pressing and holding the select button greater than 30 seconds. This resets all the adjust and massage settings (including any multi-contour driver seat settings associated to memory personality 1, 2 or 3).

Component Description

Front Seat Control Switch

The driver and passenger seat control switch communicate seat commands over a LIN to the DSM / SCMB , which controls seat movements.

Redundant Passenger Seat Control Switch (if equipped)

The redundant passenger seat control switch is hard-wired to the SCMB . Each switch has a momentary contact which supplys a voltage signal to the SCMB depending on which direction is selected.

DSM

The driver seat power memory seat motors (except front head restraint, if equipped) are hardwired to the DSM . The DSM controls the operation of the power memory seat. The DSM communicates on the MS-CAN . The SCME is integral to the DSM . PMI is required on both the DSM and the SCME when a new DSM is installed. The DSM hard stop/soft stops must be set/reset any time a new DSM , front seat track, front seat track motor, front seat backrest or front seat cushion extension adjuster (30-way only) is installed.

SCMB

The passenger (and passenger memory except front head restraint) seat motors are hardwired to the SCMB . The SCMB controls the operation of the passenger seat. The SCMB communicates on the MS-CAN . The SCMF is integral to the SCMB . PMI is required on both the SCMB and the SCMF when a new SCMB is installed. The SCMB hard stop/soft stops must be set/reset any time a new SCMB , front seat track, front seat track motor, front seat backrest or front seat cushion extension adjuster (30-way only) is installed.

Driver Memory Set Switch

The memory set switch (part of the seat control switch assembly) contains 3 momentary contact switches. It is hard-wired to the DDM and is used to recall memory positions stored in the DSM .

Passenger Memory Set Switch

The memory set switch (part of the seat control switch assembly) contains 3 momentary contact switches. It is hard-wired to the PDM and is used to recall memory positions stored in the SCMB .

Front Seat Track

There are 3 front seat track bi-directional motors present on front seat tracks. The horizontal (fore/aft) front seat track motor is the only seat track motor which can be serviced separately from the seat track assembly.

All other seat track motors (front height, rear height) are serviced as part of the seat track assembly. The seat track motors move the power seat forward/backward and up/down depending on the polarity of voltage supplied from the DSM or SCMB .

Front Seat Backrest

The front seat backrest contains a bi-directional motor which is integral to the seat backrest frame assembly. If equipped, the seat backrest may also contain an upper backrest pivot motor. The seat backrest motor(s) move the seat backrest forward/backward depending on the polarity of voltage supplied from the DSM or SCMB .

Front Seat Cushion Extension Adjuster

The front seat cushion extension adjuster contains bi-directional motors which are integral to the front seat cushion extension adjuster assembly. The front seat cushion extension adjuster motor(s) move the LH and RH cushion extension forward/backward depending on the polarity of voltage supplied from the DSM or SCMB .

Front Head Restraint

The front head restraint is mounted to the backrest. The front head restraint receives power and ground from the DSM or SCMB and communicates to the seat control switch through a LIN . The front head restraint also communicates to the DSM or SCMB for fault reporting and storing or recalling memory positions of the front head restraint.

FDIM

The FDIM (touchscreen) contains the multi-contour seat control buttons (if equipped). The FDIM plugs directly into the APIM , and does not communicate directly on any network.

FCIM

The FCIM contains the heated/ventilated seat buttons. PMI is required when a new FCIM is installed.

Heater Mat

The cushion heater mats are each equipped with a temperature sensor (thermistor) which provides feedback to the SCME / SCMF . The cushion and backrest heater mats are connected in series.

SCME

The SCME controls the operation of the driver side heated/ventilated seat system. The SCME is integral to the DSM . PMI is required on both the DSM and the SCME when a new DSM is installed.

When the heated seats are activated, the SCME monitors the seat cushion temperature sensor and supplies heater current to the seat cushion and backrest heater mats until the desired setpoint temperature is reached. Once the setpoint temperature is reached, the SCME cycles the heater circuits on/off as required to maintain the setpoint temperature.

When the ventilated seats are activated, the SCME controls the speed of the backrest and cushion blower motors dependant upon which vent mode is selected (low, med, or high).

SCMF

The SCMF controls the operation of the passenger side heated/ventilated seat system. The SCMF is integral to the SCMB . PMI is required on both the SCMB and the SCMF when a new SCMB is installed.

When the heated seats are activated, the SCMF monitors the seat cushion temperature sensor and supplies heater current to the seat cushion and backrest heater mats until the desired setpoint temperature is reached. Once the setpoint temperature is reached, the SCMF cycles the heater circuits on/off as required to maintain the setpoint temperature.

When the ventilated seats are activated, the SCMF controls the speed of the backrest and cushion blower motors dependant upon which vent mode is selected (low, med, or high).

SCMG

The SCMG controls the operation of the driver multi-contour seat. The SCMG communicates to the front seat cushion adjuster and front seat backrest adjuster through a LIN . The SCMG controls the air pump which supplies air pressure necessary to be diverted to the applicable air bladders/bolsters as required for the desired mode(s) of operation. PMI is required when a new SCMG is installed. The SCMG communicates on the MS-CAN .

SCMH

The SCMH controls the operation of the driver multi-contour seat. The SCMH communicates to the front seat cushion adjuster and front seat backrest adjuster through a LIN . The SCMH controls the air pump which supplies air pressure necessary to be diverted to the applicable air bladders/bolsters as required for the desired mode(s) of operation. PMI is required when a new SCMH is installed. The SCMH communicates on the MS-CAN .

Blower Motor

The seat cushion and backrest are each equipped with a blower motor assembly. The blower motor assembly is controlled by the SCME / SCMF .

Front Seat Power Lumbar Assembly - Without Multi-Contour Seats

The front seat power lumbar assembly is mounted to the backrest (serviced as an assembly).

Front Seat Power Lumbar Assembly - Multi-Contour Seats

The front seat power lumbar assembly includes 3 inflatable air bladders, SCMG or SCMH and hoses (serviced as an assembly). PMI is required on the SCMG or SCMH when a new front seat power lumbar assembly is installed.

Front Seat Cushion Adjuster - Multi-Contour Seats

The front seat cushion adjuster includes 4 inflatable air bladders, control module and hoses (serviced as an assembly). The front seat cushion adjuster communicates to the SCMG or SCMH through a LIN .

Front Seat Cushion Bolster - Multi-Contour Seats

The front seat cushion bolster includes 2 inflatable air bladders and hoses (serviced as an assembly). The front seat cushion bolster is controlled directly by the front seat power lumbar assembly (SCMG or SCMH ).

Front Seat Backrest Adjuster - Multi-Contour Seats

The front seat backrest adjuster includes 10 inflatable air bladders, control module and hoses (serviced as an assembly). The front seat backrest adjuster communicates to the SCMG or SCMH through a LIN .

Front Seat Backrest Bolster - Multi-Contour Seats

The front seat backrest bolster includes 2 inflatable air bladders and hoses (serviced as an assembly). The front seat backrest bolster is controlled directly by the front seat cushion adjuster.

Front Multi-Contour Control Pump

The SCMG / SCMH controls the operation of the front multi-contour control pump which supplies air pressure necessary to be diverted to the applicable air bladders as required for the desired mode(s) of operation.