Test I: The Memory Seat Does Not Operate Correctly - Does Not Operate Using The Memory Set Switch

PINPOINT TEST I: THE MEMORY SEAT DOES NOT OPERATE CORRECTLY - DOES NOT OPERATE USING THE MEMORY SET SWITCH

I1-I3:

I3-I5:

I5-I6:

I7:

I8-I10:

I10-I11:

I12-I13:

I14-I15:

I15-I16:

I17:

I18:

I19:

NOTE: Before carrying out diagnostic testing for the driver seat module (DSM), wake the module by activating the power seat using the seat control switch, otherwise module communication failure will occur.

Normal Operation
The driver seat control switch is powered by battery voltage on circuit 1567 (RD/LB). When pressed, the seat control switch supplies the voltage to the driver seat module (DSM). The DSM then supplies voltage and ground to the appropriate power seat track motor based on the inputs received from the seat control switch. When pressed in the opposite direction, the seat control switch reverses the polarity to the DSM, which moves the seat in the opposite direction. There are 3 power seat track motors that combine to move the seat horizontally (FORWARD/REVERSE) and vertically (front UP/DOWN and rear UP/DOWN).

Each power seat track motor includes a position sensor, which is a potentiometer. The DSM supplies a shared reference voltage and ground to each position sensor. This enables the position sensor to send a variable voltage back to the DSM to indicate the position of the power seat track motor. The DSM uses this information to return the seat to a stored pre-programmed position when pressing the memory set switch or a remote transmitter. Refer to Seats and the owner's literature.

The given pinpoint test diagnoses a memory seat that does not operate correctly using the memory set switch. If the memory seat does not move in all directions using the seat control switch, GO to Pinpoint Test H.

Possible Causes
A memory seat that does not operate correctly can be caused by:
- an open fuse.
- faulty wiring, terminals or connectors.
- a faulty memory set switch.
- a faulty memory seat position sensor.
- a faulty DSM.
- a faulty smart junction box (SJB).