Circuit/System Verification

WARNING: This page is about a different car, the 2017 GMC Acadia. However, it is still accessible from the selected car via links, so may be relevant.

Ignition ON.
Verify the scan tool Brake Pedal Applied parameter changes between Active and Inactive while pressing and releasing the brake pedal.
- If the parameter does not change
  Refer to Brake Pedal Position Sensor Malfunction.
- If the parameter changes
Verify the left stop lamp turns ON and OFF when commanding the Left Rear Turn Signal/Stop Lamp ON and OFF with a scan tool.
- If the left stop lamp does not turn ON and OFF
  Refer to Stop Lamps Malfunction.
- If the left stop lamp turns ON and OFF
Verify the right stop lamp turns ON and OFF when commanding the Right Rear Turn Signal/Stop Lamp ON and OFF with a scan tool.
- If the right stop lamp does not turn ON and OFF
  Refer to Stop Lamps Malfunction.
- If the right stop lamp turns ON and OFF
Verify the center high mounted stop lamp turns ON and OFF when commanding the Center Stop Lamp ON and OFF with a scan tool.
- If the center high mounted stop does not turn ON and OFF
  Refer to Center High Mounted Stop Lamp Malfunction.
- If the center high mounted stop turns ON and OFF
All OK.