Lincoln Corsair: Front Seats / Description and Operation - Front Seats - System Operation and Component Description

System Operation

System Diagram - Driver Memory Seat

Network Message Chart - Driver Memory Seat

  DSM Network Input Messages

  SCMG Network Input Messages

System Diagram - Heated Seats

Network Message Chart - Heated Seats

  HVAC Module Network Input Messages

  FCIMB Network Input Messages

System Diagram - Heated/Ventilated Seats

Network Message Chart - Heated/Ventilated Seats

  SCME Network Input Messages

  FCIMB Network Input Messages

System Diagram - Multi-Contour Front Seats

Network Message Chart - Multi-Contour Front Seats

  FDIM Network Input Messages

  SCMG / SCMH Network Input Messages

  SCMH Network Input Messages

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. The motor circuits are normally grounded through the DSM . The DSM internally switches the appropriate circuit from ground to voltage to operate the motors.

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.

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 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.

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 the function is disabled or a valid input command is received from the driver seat control switch, memory set switch or exterior mirror control switch.

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 or a memory position recall using the memory set switch is received.

The easy entry/exit feature can be enabled/disabled through 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. The motor circuits are normally grounded through the SCMB . The SCMB internally switches the appropriate circuit from ground to voltage to operate the motors.

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.

Heated Seat Operation

The driver and passenger heated seat buttons are selected from the FCIMB , which then sends the requests to the HVAC module through the CAN . The heated seat system functions independently of the vehicle's climate control system. The system control settings are indicated next to the heated seat switch button. The first setting is high (3 indicators), the second setting is med (2 indicators), the third setting is low (1 indicator) and then off (no indicators).

When activated, the HVAC module 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 HVAC module and powered by the output circuit for that seat. The HVAC module 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 HVAC module off or the ignition is off.

If a fault is detected by the HVAC module, the module stops supplying voltage to that individual left or right seat that the fault was detected on until the ignition is cycled off and then on.

Heated/Ventilated Seat Operation

The driver and passenger heated/ventilated seat buttons are selected from the FCIMB , which then sends the requests to the SCME module through the CAN . The heated/ventilated seat system functions independently from the vehicle's climate control system.

Heat Operation

• The system control settings are indicated next to each heated/ventilated seat switch button. The first setting is HIGH (3 indicators), the second setting is MED (2 indicators) and the third is LOW (1 indicator) then OFF (no indicators).
• When activated, the SCME 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 and powered by the output circuit for that seat. The SCME 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 off or the ignition is 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 controls the blower speed depending on the heated/ventilated seat settings.
• The system control settings are based on the 3 indicators next to each heated/ventilated seat switch button. The first setting is HIGH (3 indicators), the second setting is MED (2 indicators) and the third is LOW (1 indicator) then OFF (no indicators).

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. 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 or heated/ventilated seat activates in full heat mode when the outside temperature is less than 0° C (32° F) and full cool mode (heated/ventilated seats only) when outside temperature is greater than 27° C (80° F) any time the vehicle is started using the remote start feature. No heated or heated/ventilated seat adjustments are recognized during remote start operation.

Multi-Contour Seat Operation

The multi-contour seats are independently controlled by the seat control buttons on the FDIM (touchscreen). The driver and passenger front seats each contain a total of 11 inflatable bladders: 4 cushion bladders, 2 cushion side bolsters, 3 backrest lumbar 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 lumbar and cushion bladders to simulate a massage motion. When the massage mode is active, it will time out after 20 minutes of operation (a pop-up message appears on the FDIM screen massage off and restoring seat setting at which time the lumbar returns to its last settings).

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

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).

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

Seat Control Switch

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

DSM

The driver seat power memory seat motors 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 , driver seat track, horizontal motor, driver seat backrest, cushion extension assembly (24-way seat only) is installed.

SCMB

The passenger power seat motors are hardwired to the SCMB . The SCMB controls the operation of the seat. The SCMB communicates on the MS-CAN . PMI is required on the SCMB when a new SCMB is installed.

Driver Memory Set Switch

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

Driver Seat Track

There are 3 front seat track bi-directional motors present on power 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 .

Passenger Seat Track

The passenger power seat is equipped with 3 front seat track bi-directional motors. 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 SCMB .

Driver Seat Backrest

The driver seat backrest contains a bi-directional motor which is integral to the seat backrest frame. The seat backrest motor moves the seat backrest forward/backward depending on the polarity of voltage supplied from the DSM .

Passenger Seat Backrest

The passenger seat backrest contains a bi-directional motor which is integral to the seat backrest frame. The seat backrest motor moves the seat backrest forward/backward depending on the polarity of voltage supplied from the SCMB .

FDIM

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

FCIMB

The FCIMB contains the heated seat (or heated/ventilated seat) buttons. PMI is required when a new FCIMB is installed.

HVAC Module

If equipped with heated seats, the HVAC module 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 HVAC module cycles the heater circuits on/off as required to maintain the setpoint temperature. PMI is required when a new HVAC module is installed.

Heater Mat

The cushion heater mats are each equipped with a temperature sensor (thermistor) which provides feedback to the HVAC module (heated seats only) or SCME (heated/ventilated seats). The cushion and backrest heater mats are connected in series.

SCME

The SCME controls the operation of the driver and passenger 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).

SCMG

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

SCMH

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

Blower Motor

If equipped with heated/ventilated seats, the seat cushion and backrest are each equipped with a blower motor assembly. The blower motor assembly is controlled by the SCME .

Front Seat Power Lumbar Assembly - Without Multi-Contour Seats

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

Front Seat Power Lumbar Assembly - Multi-Contour Seats

The front seat power lumbar assembly includes an air pump, air hoses and bladders (serviced as an assembly).

Front Seat Cushion Adjuster - Multi-Contour Seats

The front seat cushion adjuster includes air hoses and bladders (serviced as an assembly).