Memory Seat Feature Inoperative
Memory Seat Feature Inoperative
Diagnostic Instructions
* Perform the Diagnostic System Check - Vehicle (Diagnostic System Check - Vehicle) prior to using this diagnostic procedure.
* Review Strategy Based Diagnosis (Strategy Based Diagnosis) for an overview of the diagnostic approach
* Diagnostic Procedure Instructions (Diagnostic Procedure Instructions) provides an overview of each diagnostic category
Diagnostic Fault Information
Circuit/System Description
Reference voltage is supplied to the memory switch from the driver door module (DDM). When a memory switch is pressed, reference 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 serial data message to the memory seat module (MSM) indicating the memory recall request. In response to the switch input, the MSM then commands the appropriate seat motors to move to the pre-recorded seat positions stored in memory.
Diagnostic Aids
The driver door module is referenced in Tech 2 as the Driver Door Switch.
Reference Information
Schematic Reference
Driver Seat Schematics (Driver Seat Schematics)
Connector End View Reference
Component Connector End Views (Connector Views)
Description and Operation
Power Seats System Description and Operation (Power Seats System 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) for scan tool information
Circuit/System Verification
1. Verify that all manual power seat and lumbar functions operate when being controlled by the seat adjuster switch and lumbar switches.
• If any seat or lumbar function does not operate, refer to Power Seat Inoperative (With Memory A45) (Power Seat Inoperative (With Memory A45))Power Seat Inoperative (Without Memory A45) (Power Seat Inoperative (Without Memory A45)) or Lumbar Support Inoperative (Without Memory A45) (Lumbar Support Inoperative (Without Memory A45))Lumbar Support Inoperative (With Memory A45) (Lumbar Support Inoperative (With Memory A45)).
2. Verify that the memory recall personalization option is ON. Refer to the owners manual.
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 Memory Recall Switches parameter is approximately 2.74 volts while pressing the memory 1 switch.
• If not the specified value, refer to the Memory Switch component test. If the switch tests normal, replace the driver door switch.
2. Verify the scan tool Memory Recall Switches parameter is approximately 1.78 volts while pressing the memory 2 switch.
• If not the specified value, replace the memory/heated seat switch.
3. Verify the scan tool Memory Recall Switches parameter is approximately 0.96 volts while pressing the EXIT switch.
• If not the specified value, replace the memory/heated seat switch.
4. If all circuits test normal, replace the MSM.
Component Testing
Memory Switch
1. Disconnect the X4 harness connector at driver door switch.
2. Test for infinite resistance between the signal circuit terminal 5 and the voltage reference circuit terminal 14.
• If not the specified value, replace the memory/heated seat switch.
3. Test the resistance between terminal 14 and terminal 5 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 memory/heated seat switch.
Repair Instructions
Perform the Diagnostic Repair Verification (Verification Tests) after completing the diagnostic procedure.
* Driver Seat Adjuster Memory Switch Replacement (Service and Repair)
* Control Module References (Programming and Relearning) for MSM or DDS replacement, programming, and setup.