Battery positive voltage is supplied to the memory 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 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.

The DDM is referenced in Tech 2 as the Driver Door Switch.

Schematic Reference

Driver Seat Schematics

Connector End View Reference

Power Seat Connector End Views

Electrical Information Reference

Scan Tool Reference

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.

1. Ignition OFF, disconnect the harness connector at the heated/cooled seat switch.
2. Ignition ON, test for B+ between the memory seat switch supply voltage circuit terminal 1 and ground.

⇒	If less than B+, test the supply voltage circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the driver door module.

3. Test for 0 volts between the memory switch signal circuit terminal 9 and ground.

⇒	If greater than 0 volts, test the signal circuit for a short to voltage.

4. Ignition OFF, connect the harness connector at the heated/cooled seat switch.
5. 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, test the memory switch signal circuit terminal 9 for a short to ground or an open/high resistance. If the circuit tests normal, perform the Memory Switch component test. If the switch tests normal, replace the driver door module.

6. 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 heated/cooled seat switch.

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

⇒	If the parameter does not change state, replace the heated/cooled seat switch.

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

Memory Switch

1. Disconnect the harness connector at the heated/cooled seat switch.
2. Test for infinite resistance between the memory switch signal circuit terminal 9 and the switch supply voltage circuit terminal 1.

⇒	If not infinite, replace the heated/cooled seat switch.

3. Test the resistance between terminal 1 and terminal 9 while pressing the memory 1, memory 2, and EXIT buttons. 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 heated/cooled seat switch.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.