Circuit/System Verification

WARNING: This page is about a different car, the 2021 GMC Sierra 3500 HD and 2021 GMC Sierra 2500 HD. However, it is still accessible from the selected car via links, so may be relevant.

Ignition - On / Vehicle - In Service Mode
Operate the component:
- M50D Seat Front Vertical Motor - Driver
- M51D Seat Horizontal Motor - Driver
- M55D Seat Rear Vertical Motor - Driver
- M56D Seat Recline Motor - Driver
Verify the component operates in both directions:Forward & Rearward/Up & Down
- If the component does not work as specified
  Refer to: Power Seat Malfunction (Driver With A45) Power Seat Malfunction (Driver Without A45) Power Seat Malfunction (Passenger)
- Go to next step: If all components operate
Refer to: Circuit/System Testing