Circuit/System Verification
WARNING: This page is about a different car, the 2022 Cadillac CT4. However, it is still accessible from the selected car via links, so may be relevant.
- Ignition/Vehicle in Service Mode.
- Verify no DTCs are set.
- If any DTCs are set
- Go to next step: If no DTCs are set
- Verify the appropriate scan tool Driver or Passenger Seat Switch parameters listed below change between Inactive and Forward/Rearward or Up/Down when pressing the appropriate switch.
- Seat Horizontal Switch
- Seat Cushion Front Vertical Switch
- Seat Cushion Rear Vertical Switch
- Seat Back Switch
- If the parameter does not change
Test or replace the S64 Front Seat Adjuster Switch
- Go to next step: If the parameter changes
- Verify the appropriate scan tool Driver or Passenger Lumbar Support Horizontal Switch parameter changes between Inactive and Forward/Rearward when pressing the lumbar horizontal switch in the Forward and Rearward directions.
- If the parameter does not change in either direction
Refer to Circuit/System Testing - Seat Lumbar Switch Circuit Test.
- Go to next step: If the parameter changes for both directions
- If the parameter does not change in either direction
- Verify the scan tool Lumbar Support Vertical Switch parameter changes between Inactive and Up/Down when pressing the lumbar vertical switch in the Up and Down directions.
- If the parameter does not change
Test or replace the S65 Front Seat Lumbar Switch.
- Go to next step: If the parameter changes
- If the parameter does not change
- Verify the scan tool Seat Back Side Bolster Switch parameter changes between Inactive and Inflate/Deflate when pressing the bolster switch in both directions.
- If the parameter does not change
Test or replace the S65 Front Seat Lumbar Switch.
- Go to next step: If the parameter changes
- If the parameter does not change
- Verify the scan tool Seat Cushion Side Bolster Switch parameter changes between Inactive and Inflate/Deflate when pressing the bolster switch in both directions.
- If the parameter does not change
Test or replace the S65 Front Seat Lumbar Switch.
- Go to next step: If the parameter changes
- If the parameter does not change
- Verify the scan tool Seat Massage Switch parameter changes between Inactive and On/Off when pressing the seat massage switch.
- If the parameter does not change
Test or replace the S65 Front Seat Lumbar Switch.
- Go to next step: If the parameter changes
- If the parameter does not change
- Verify the lumbar/bolster/massage functions listed below operate while operating the lumbar switches in both directions.
- Lumbar Support Horizontal
- Lumbar Support Vertical
- Seat Back Side Bolster
- Seat Cushion Side Bolster
- Seat Massage
- If any lumbar/bolster/massage function does not operate
Refer to Circuit/System Testing - Seat Lumbar Circuit Test.
- Go to next step: If all lumbar/bolster/massage functions operate
- A fault is currently not present and may be an intermittent condition.