Memory Seat Feature Inoperative

Memory Seat Feature Inoperative

Diagnostic Fault Information

Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure. Initial Inspection and Diagnostic Overview






Circuit/System Description

Battery positive voltage is supplied to the memory function switch from the driver door module (DDM). When a memory switch is pressed, battery voltage is applied through the switch contacts, a series of resistors, and thorough the memory switch signal circuit to the DDM. The door control module then sends a message via the GMLAN serial data line to the memory seat module (MSM) indicating the memory recall request. The MSM then commands the appropriate seat motors to move to the pre-recorded seat positions stored in memory in response to the switch input.

Diagnostic Aids

* The Driver Door Module is referenced in Tech 2 as the Driver Door Switch.
* The Memory Seat Module is referenced in the Tech 2 as the Driver Position Module.

Circuit/System Verification

1. Verify that all manual power seat and lumbar functions operate as described in the description and operation. Refer to Memory Seats Description and Operation.
2. Verify that the memory recall personalization option is ON. Refer to Personalization Description and Operation and Vehicle Personalization.
3. Verify that memory positions for driver 1 and driver 2 have been recorded to memory, by observing the scan tool Driver Position Module, Memory Data 1 and Memory Data 2 parameters.

Circuit/System Testing

1. Ignition ON, verify the scan tool Driver Door Switch Memory Recall Switches parameter changes state while pressing the memory 1 switch.

• If the parameter does not change state, perform the Memory Switch component test. If the switch tests normal, replace the driver door module.

2. Verify the scan tool Memory Recall Switches parameter changes state while pressing the memory 2 switch.

• If the parameter does not change state, replace the memory switch.

3. Verify the scan tool Memory Recall Switches parameter changes state while pressing the EXIT switch.

• If the parameter does not change state, replace the memory switch.

4. If all circuits test normal, replace the memory seat module.

Component Testing

Memory Function Switch
1. Disconnect the (C4) harness connector at driver door module.
2. Test for infinite resistance between the memory switch signal circuit terminal 5 and the switch supply voltage circuit terminal 14.

• If not infinite, replace the memory switch.

3. Test the resistance between terminals 14 and 5. Press the memory 1, memory 2, and EXIT buttons and compare the resistance readings to the values in the Memory Switch Values table below.

• If the resistance is not within the specified range, replace the memory switch.






Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

* Driver Seat Adjuster Memory Switch Replacement
* Control Module References for MSM and DDM replacement, setup, and programming Programming and Relearning Verification Tests