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

System Operation

System Diagram - Heated/Ventilated Second Row Seats

*.sttxt { visibility: hidden; } *.stcallout { visibility: visible; } E371920 1 GWM 2 Cushion Heater Mat 3 Cushion Temp Sensor 4 Backrest Heater Mat 5 RACM 6 SCME 7 SCMF 8 Backrest Heater Mat 9 Cushion Heater Mat 10 Cushion Temp Sensor 11 Cushion and Backrest Blower Motors 12 Cushion and Backrest Blower Motors

Item	Description
1	GWM
2	Cushion Heater Mat Comment: LH Rear Seat
3	Cushion Temp Sensor Comment: LH Rear Seat
4	Backrest Heater Mat Comment: LH Rear Seat
5	RACM
6	SCME
7	SCMF
8	Backrest Heater Mat Comment: RH Rear Seat
9	Cushion Heater Mat Comment: RH Rear Seat
10	Cushion Temp Sensor Comment: RH Rear Seat
11	Cushion and Backrest Blower Motors Comment: RH Rear Seat
12	Cushion and Backrest Blower Motors Comment: LH Rear Seat

Network Message Chart - Heated/Ventilated Second Row Seats

  SCME Network Input Messages

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

  SCMF Network Input Messages

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

  RACM Network Input Messages

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

System Diagram - Multi-Contour Second Row Seats

*.sttxt { visibility: hidden; } *.stcallout { visibility: visible; } E371928 1 GWM 2 Multi-Contour Seat Cushion Adjuster 3 RACM 4 SCMC 5 SCMD 6 Multi-Contour Seat Power Lumbar Assembly 7 Multi-Contour Control Pump 8 Multi-Contour Control Pump 9 Multi-Contour Seat Cushion Adjuster 10 Multi-Contour Seat Power Lumbar Assembly

Item	Description
1	GWM
2	Multi-Contour Seat Cushion Adjuster Comment: LH Rear Seat
3	RACM
4	SCMC
5	SCMD
6	Multi-Contour Seat Power Lumbar Assembly Comment: LH Rear Seat
7	Multi-Contour Control Pump Comment: LH Rear Seat
8	Multi-Contour Control Pump Comment: RH Rear Seat
9	Multi-Contour Seat Cushion Adjuster Comment: RH Rear Seat
10	Multi-Contour Seat Power Lumbar Assembly Comment: RH Rear Seat

Network Message Chart - Multi-Contour Second Row Seats

  RACM Network Input Messages

Broadcast Message	Originating Module	Message Purpose
Multi-contour seat switch status	SCMC (LH rear multi-contour seat module)	The SCMC (LH rear multi-contour seat module) provides this message to the RACM for the purpose of updating the displayed status of the multi-contour seat buttons on the RACM (touchscreen).
Multi-contour seat position data	SCMC (LH rear multi-contour seat module)	The SCMC (LH rear multi-contour seat module) provide this message to the RACM for the purpose of updating the displayed pressure of the multi-contour seat bladders on the RACM (touchscreen).
Multi-contour seat switch status	SCMD (RH rear multi-contour seat module)	The SCMD (RH rear multi-contour seat module) provides this message to the RACM for the purpose of updating the displayed status of the multi-contour seat buttons on the RACM (touchscreen).
Multi-contour seat position data	SCMD (RH rear multi-contour seat module)	The SCMD (RH rear multi-contour seat module) provide this message to the RACM for the purpose of updating the displayed pressure of the multi-contour seat bladders on the RACM (touchscreen).

  SCMC (LH rear multi-contour seat module) Network Input Messages

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

  SCMD (RH rear multi-contour seat module) Network Input Messages

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

Power E-Z Entry Seats

When the rear passenger door is open, the E-Z entry seats are activated by the associated seat switch (located in each C-pillar trim panel). When the SCMJ receives an input from the seat switch, it supplies voltage to an actuator which releases a latch, allowing the seat base to pitch up/forward. To return to a seating position, the seat must be manually latched to the floor. There are no serviceable components of the power E-Z entry system within the seat assembly. The actuator is serviced by installing a new seat frame assembly.

Power-Folding Seats

When the seat control switch is activated, the SCMJ activates the second row power fold seat motor which retracts a cable (connected to the same seat latch mechanism as the manual release handle) to release the backrest recliner latches and allows the backrest assist spring to fold the backrest forward onto the seat cushion. Immediately after the seat is fully released, the power fold seat motor returns the release cable and latches to a relaxed state, ready for manual latching. To return to a seating position, the seat must be manually latched to the floor and the backrest must be manually latched upright. There are no serviceable components of the power-folding seat system within the seat assembly. The power fold seat motors are serviced by installing a new seat frame assembly.

Heated/Ventilated Seat Operation

The rear passenger heated/ventilated seat buttons are selected from the RACM (touchscreen) module. The LH rear seat is controlled by the SCME (integral to the DSM . The RH rear 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.

Multi-Contour Seat Operation

NOTE: The engine must be running or the vehicle must be in accessory mode to activate the rear multi-contour seats.

NOTE: The multi-contour seat massage mode is disabled when the child safety lock is active. For additional information on how to enable/disable the child safety locks, refer to the Owner's Literature.

The multi-contour seats are independently controlled by the seat control switches (located on the RACM (touchscreen). The LH and RH rear seats each contain a total of 7 inflatable bladders: 4 cushion bladders and 3 backrest lumbar bladders. The pressures for the lumbar and cushion bladders are displayed on the RACM 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 to be inflated or deflated to a desirable feel. Massage mode provides a sequence of inflation and deflation of the 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: Upper lumbar, middle lumbar and lower lumbar.
• When the inflate/deflate buttons are pressed (or held), the pressure increases or decreases for the currently selected bladder.
• Pressing the mode select button toggles the seat to massage mode. The ignition must be on for massage mode to function.

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.

Component Description

Power E-Z Entry Seat Control Switch

The power E-Z fold seat switches are momentary contact switches that, when pressed, supply an input to the SCMJ which then activates the associated second row E-Z entry power release seat actuator motors to release the seat assembly and allow it to pitch up/forward.

Power-Fold Seat Control Switch

The power-fold seat switch is a momentary contact switch that, when pressed, supplies an input to the SCMJ which then activates the associated second row power release seat actuator motors to release the backrest and allows it to fold forward.

Seat Heater Mat

Each seat backrest heater mat is equipped with a temperature sensor (thermistor) which provides feedback to the heated seat module. The cushion and backrest heater mats are connected in series.

Blower Motor

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

Multi-Contour Seat Power Lumbar Assembly

The multi-contour seat power lumbar assembly includes (SCMC (LH rear multi-contour seat module) or SCMD ( RH rear multi-contour seat module), 3 inflatable air bladders and hoses). PMI is required when a new SCMC ( LH rear multi-contour seat module) or SCMD ( RH rear multi-contour seat module) is installed.

Multi-Contour Seat Cushion Adjuster

The multi-contour seat cushion adjuster includes control module, air hoses and bladders (serviced as an assembly). The multi-contour seat cushion adjuster communicates to the SCMC (LH rear multi-contour seat module)/SCMD ( RH rear multi-contour seat module) through a private LIN and does not communicate on any other vehicle network.

Multi-Contour Control Pump

The SCMC (LH rear multi-contour seat module)/SCMD ( RH rear multi-contour seat module) controls the operation of the 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.

SCMC (LH rear multi-contour seat module)

The SCMC (LH rear multi-contour seat module) is serviced by installing a new multi-contour seat power lumbar assembly. The SCMC ( LH rear multi-contour seat module) controls the operation of the LH rear multi-contour seat. PMI is required when a new SCMC ( LH rear multi-contour seat module) is installed. The SCMC ( LH rear multi-contour seat module) communicates on the MS-CAN . The SCMC ( LH rear multi-contour seat module) controls the 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 and also communicates to the multi-contour seat cushion adjuster through a LIN .

SCMD (RH rear multi-contour seat module)

The SCMD (RH rear multi-contour seat module) is serviced by installing a new multi-contour seat power lumbar assembly. The SCMD ( RH rear multi-contour seat module) controls the operation of the RH rear multi-contour seat. PMI is required when a new SCMD ( RH rear multi-contour seat module) is installed. The SCMD ( RH rear multi-contour seat module) communicates on the MS-CAN . The SCMD ( RH rear multi-contour seat module) controls the 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 and also communicates to the multi-contour seat cushion adjuster through a LIN .

SCME

The SCME (integral to the DSM controls the operation of the LH rear heated/ventilated seat system. The SCME communicates on the MS-CAN . PMI is required on the SCME and DSM when a new module is installed. The DSM hard stop/soft stops must be set/reset any time a new DSM , front driver seat track or front driver seat backrest is installed.

SCMF

The SCMF (integral to the SCMB controls the operation of the RH rear heated/ventilated seat system. The SCMF communicates on the MS-CAN . PMI is required on the SCMF and SCMB when a new module is installed. The SCMB hard stop/soft stops must be set/reset any time a new SCMB , front passenger seat track or front passenger seat backrest is installed.

RACM

The RACM module contains the heated/ventilated seat control buttons and multi-contour seat buttons. PMI is required when a new RACM is installed.

SCMJ

The SCMJ controls the operation of the power E-Z entry and power-folding seats. PMI is required when a new SCMJ is installed.