Circuit/System Verification
WARNING: This page is about a different car, the 2010 GMC Sierra, 2010 GMC Cab & Chassis Sierra, 2010 Chevrolet Silverado, and 2010 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.
- Ignition ON, verify that all manual power seat functions operate when being controlled by the seat adjuster switches.
- If all seat functions do not operate, refer to Power Seat Inoperative (Without Memory A45) or Power Seat Inoperative (With Memory A45) .
- Ignition ON, observe the scan tool Driver Position Module lumbar switch parameters while pressing the appropriate lumbar switch. The reading should change between Inactive and Active.
- If the reading does not change between the specified values, refer to the Lumbar Switch Circuit Test.
- If all lumbar switch inputs to the MSM function normal, refer to the Lumbar Motor Control Circuit Test.