Circuit/System Verification

Ignition ON/Vehicle in Service Mode.
Verify that no DTCs are set.
- If any DTC is set
  Refer to Diagnostic Trouble Code (DTC) List - Vehicle .
- Go to next step: If no DTCs are set
Select the appropriate scan tool control module listed below:
- Seat Memory Control Module - Driver
- Seat Memory Control Module - Passenger
- Seat Memory Control Module - Left Rear
- Seat Memory Control Module - Right Rear
Verify the scan tool Seat Function Select Switch parameter changes between Inactive and UP or Down when operating the switch.
- If the parameter does not change
  Test or replace the S64 Seat Adjuster Switch.
- Go to next step: If the parameter changes
Verify the scan tool Seat 4-Way Switch parameter changes between Inactive and UP/Down or Forward/Rearward when operating the 4-way switch in the up/down and forward/rearward directions.
- If the parameter does not change
  Test or replace the S64 Seat Adjuster Switch.
- Go to next step: If the parameter changes
Verify the scan tool Seat Massage Switch parameter changes between Active and Inactive when pressing the seat massage switch.
- If the parameter does not change
  Test or replace the S64 Seat Adjuster Switch.
- Go to next step: If the parameter changes
Verify that all K134 Seat Bolster Memory Control Module functions operate when being controlled by the S64 Seat Adjuster Switch.
- If all K134 Seat Bolster Memory Control Module functions are inoperative
  Perform the seat lumbar/bolster pump component test below.
- If any but not all of the K134 Seat Bolster Memory Control Module functions is inoperative
1. Ignition ON/Vehicle in Service Mode.
2. Test the integrity of the air hoses and bladders for the inoperative lumbar/bolster function.
  - If a fault is found with the air hoses or bladders, repair or replace as needed.
  - Go to next step: If the air hoses and bladders test normal.
3. Replace the K134 Seat Bolster Memory Control Module.
- Go to next step: If all K134 Seat Bolster Memory Control Module functions operate
All OK.