System Operation

Seating - Memory

System Operation

System Diagram





Network Message Chart

BCM (Body Control Module) Network Input Messages





DSM (Driver Seat Module) Network Input Messages






Memory Recall

NOTE: A memory recall in progress does not prohibit the initiation of another memory recall; the most recently requested memory recall is executed.

The NEUTRAL position of the driver seat control switch is at a ground state through the seat control switch normally-closed contacts. The driver seat control switch provides voltage to the DSM (Driver Seat Module) only when activated. A voltage input causes the DSM (Driver Seat Module) to power the appropriate motor until the input is removed. Ground is the normal state of the motor circuits through the DSM (Driver Seat Module). The DSM (Driver Seat Module) internally switches the appropriate circuit from ground to voltage to operate the motors.

As the seat is adjusted, the DSM (Driver Seat Module) monitors the motor position sensors to record the current seat position. The DSM (Driver Seat Module) removes voltage from the motor upon termination of the seat control switch input or if the DSM (Driver Seat Module) does not detect movement from the motor while monitoring the position sensor during a memory recall operation.

RKE (Remote Keyless Entry) Transmitter

A RKE (Remote Keyless Entry) transmitter can be used to recall previously set memory positions but must first be associated to that memory position. The transmitter associated with personality 1 is capable of recalling memory position 1 only. Similarly, the associated personality 2 transmitter can recall only memory position 2.

DSM (Driver Seat Module) Hard Stop/Soft Stop

The DSM (Driver Seat Module) has the ability for soft stops both at the upper and lower limits on all axes of the driver seat. When an axis reaches the hard stop and the switch is held for approximately one second, it then backs up 180 ms and establishes the soft stop for that axis in that direction. The DSM (Driver Seat Module) uses this back up strategy to check sensor integrity any time movement has stopped prematurely due to a sensor failure or obstruction.

A hard stop occurs when one of the memory seat track axes or backrest recline physically reach the end of travel and can go no further. A soft stop occurs when the seat stops before physically reaching 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 (Driver Seat Module). The seat track axes are forward/rearward, front up/down and rear up/down. The backrest axis is recline forward/backward. To prevent unnecessary stress on the seat and motors, the DSM (Driver Seat Module) sets soft stop positions, 2 for each moving axis. The DSM (Driver Seat Module) 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 (Driver Seat Module) establishes the soft stop for that axis in that direction.

Setting the Soft Stop

NOTE: If a new DSM (Driver Seat Module) or driver seat track has been installed, reset all driver seat track soft stops.

Use the following procedure once a new seat track or DSM (Driver Seat Module) has been installed. During the setting procedure, if the seat track stops before the end of travel has been reached, the DSM (Driver Seat Module) has stopped at a previously set soft stop. To set the new soft stop, release the seat control switch and immediately press again in the same direction until the seat track stops at the hard stop for that given direction.

Turn the ignition ON.
- Press the seat control switch horizontal button forward until the seat track stops.
- Keep the horizontal button pressed forward for one second after the seat track reaches its forward end of travel. The horizontal forward soft stop has been set, release the switch button.
- Repeat the previous steps for all seat track axes in both directions.

Easy Entry, Easy Exit

The easy entry/exit feature is a function of the DSM (Driver Seat Module) 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 key is removed from the ignition switch. The DSM (Driver Seat Module) receives a key-in-ignition status over the MS-CAN (Medium Speed Controller Area Network) and operates the driver seat rearward. The DSM (Driver Seat Module) 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 (Driver Seat Module) records the current seat positions before operating the seat for an easy exit operation. This recorded position returns the seat to this position on the easy entry operation. During easy entry operation, the seat is returned to the position previous to the easy exit operation. Easy entry operation is cancelled if a valid input command is received by the DSM (Driver Seat Module).

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