Memory Seat Feature Inoperative

Memory Seat Feature Inoperative

Diagnostic Instructions

* Perform the Diagnostic System Check - Vehicle (Initial Inspection and Diagnostic Overview) prior to using this diagnostic procedure.
* Review Strategy Based Diagnosis (Initial Inspection and Diagnostic Overview) for an overview of the diagnostic approach.
* Diagnostic Procedure Instructions (Initial Inspection and Diagnostic Overview) provides an overview of each diagnostic category.



Diagnostic Fault Information






Circuit/System Description

The memory seat switches are normally open and are wired to the driver door switch assembly (DDSA). When a memory recall switch is pressed, the switch pulls the 5-volt signal circuit from the DDSA to ground. The DDSA senses that a memory recall signal was pulled low and a Class 2 serial data message is sent to the memory seat module (MSM) identifying the memory request. The MSM responds to the request by commanding the driver seat to move to the preset positions.


Diagnostic Aids

The memory seat module (MSM) is also referred to as the driver position module (DPM) in certain scan tool menus.


Reference Information
Schematic Reference

Driver Seat Schematics (Driver Seat Schematics)
Connector End View Reference

Component Connector End Views (Connector Views)
Description and Operation

Memory Seats Description and Operation (Memory Seats Description and Operation)
Electrical Information Reference

* Circuit Testing (Component Tests and General Diagnostics)
* Connector Repairs (Component Tests and General Diagnostics)
* Testing for Intermittent Conditions and Poor Connections (Component Tests and General Diagnostics)
* Wiring Repairs (Component Tests and General Diagnostics)

Scan Tool Reference

Control Module References (Programming and Relearning)


Circuit/System Testing

1. Ignition OFF, disconnect the harness connector at the memory seat switch.
2. Ignition OFF, verify that a test lamp illuminates between the B+ circuit terminal C and ground.

• If the test lamp does not illuminate, test the B+ circuit for a short to ground or an open/high resistance.

3. Ignition ON, verify the scan tool memory recall switch parameters display IDLE for both switches.

• If not the specified value, test the appropriate switch signal circuit for a short to ground. If the circuit tests normal, replace the DDSA.

4. Install a 3A fused jumper wire between the B+ circuit terminal C and the signal circuit terminal A. Verify the scan tool memory recall switch parameter displays MEMORY 1.

• If not the specified value, test the signal circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the DDSA.

5. Install a 3A fused jumper wire between the B+ circuit terminal C and the signal circuit terminal B. Verify the scan tool memory recall switch parameter displays MEMORY 2.

• If not the specified value, test the signal circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the DDSA.

6. If all circuits test normal, test or replace the memory seat switch.



Repair Instructions

Perform the Diagnostic Repair Verification (Verification Tests) after completing the diagnostic procedure.


Control Module References (Programming and Relearning) for DDSA replacement, setup, and programming