Test A: The Memory Seat Is Inoperative/Does Not Operate Correctly

PINPOINT TEST A: THE MEMORY SEAT IS INOPERATIVE/DOES NOT OPERATE CORRECTLY

A1:

A2-A4:

A5-A6:

A7-A8:

A9-A11:

A12-A13:

A14-A16:

A16-A18:

A18-A20:

A20-A22:

A22-A24:

A24-A26:

A26-A28:

A28-A29:

A29-A31:

A31-A32:

A33:

Normal Operation
The power seat is powered by battery voltage to driver seat control switch circuit 1524 (DB) and ground on circuit 57 (BK) to the switch. When pressed, the power seat switch supplies voltage to the appropriate driver door module (DDM) seat control switch input circuit. The DDM transmits the driver seat control switch input data to the driver seat module using the SCP communication bus. The driver seat module (DSM) receives the input signals and then supplies voltage and ground to the appropriate power seat track motor or recliner circuits. The DSM will reverse the motor circuit polarity to operate the seat track or recliner motor in the opposite direction.

The DSM is powered by battery voltage to circuit 490 (RD), switched ignition voltage to circuit 1524 (DB), ground to circuit 57 (BK) and ground to circuit 676 (PK/OG).

A 3-lead sensor is attached to each motor on the memory seat track and recliner assembly. The sensor circuits are connected to the driver seat module (DSM) which supplies the sensor power and receives the sensor signals. The DSM receives data from the memory seat position sensors to monitor the positions of the seat track and recliner motors. This motor position data is stored when the DSM receives a SET switch input signal and recalled when it receives a RECALL switch input signal. The driver door module (DDM) is directly connected to the memory SET/RECALL switch and transmits the switch signal data to the DSM using the SCP communication bus. The DSM also receives memory recall signals from the remote transmitter over the SCP communication bus transmitted by the lighting control module (LCM).

Possible Causes
An inoperative memory seat can be caused by:
- a fuse.
- wiring, terminals or connectors.
- a faulty seat control switch.
- a faulty power seat track motor.
- a faulty DSM.