Power Driver Seat With Memory

Power Driver Seat With Memory

The memory driver seat feature allows the driver to program a personalized seat position that can be recalled using the memory switch or a remote keyless entry (RKE) transmitter (if associated). There are 2 memory settings possible. The outside rear view mirror positions, the power adjustable pedals (if equipped) position and power adjustable steering column tilt position are also stored and recalled with the power driver seat positions. For vehicles equipped with power telescopic steering columns, only the tilting feature is controlled by the memory system.

The driver power seat is controlled by the driver seat module (DSM), if equipped. The DSM is located underneath the driver seat cushion frame. Programmable module installation (PMI) must be carried out when installing a new DSM. Refer to Information Bus (Module Communications Network). The DSM does not require calibration to the driver seat track.

The driver seat control switch provides voltage to the DSM when activated. The neutral position of each driver seat control switch position is a ground state through the seat control switch contacts. A voltage input causes the DSM to power the appropriate motor until the input is removed. Ground is the normal state of the motor circuits through the DSM and is not switched to control the motors. The DSM internally switches the appropriate circuit from ground to power for operating the motors.

As the seat is adjusted, the DSM constantly monitors the motor position sensors to record the current seat position. The DSM will remove power from the motor upon termination of the seat control switch input or if the DSM does not see movement from the motor by monitoring the position sensor.

The DSM has the ability for soft stops both at the upper and lower limits on all axis of the driver seat and power adjustable steering column. When an axis reaches the hard stop and the switch is held for approximately one second it will then back up 180 msec and establish the soft stop for that axis in that direction. The DSM uses this 'back up' strategy to check sensor integrity any time movement has stopped prematurely due to a sensor failure or obstruction.

The DSM communicates diagnostic trouble code (DTC) and other information using the MS-CAN communication bus. It should be noted for diagnostics that because CAN bus communication is more robust and reliable than other methods, it may be possible to have limited module communication with one of the CAN bus circuits disconnected or shorted to ground. Refer to Information Bus (Module Communications Network) for additional information concerning MS-CAN bus communication.

This section only diagnoses concerns specific to the memory seat. To diagnose a memory power mirror concern, refer to Mirrors. To diagnose a power adjustable pedal concern, refer to Brakes and Traction Control. To diagnose a power adjustable steering column concern, refer to Transmission and Drivetrain.