Circuit/System Verification

WARNING: This page is about a different car, the 2021 Cadillac CT4. However, it is still accessible from the selected car via links, so may be relevant.

Ignition ON/Vehicle in Service Mode.
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 Stop Lamps Malfunction
- Go to next step: If the parameter changes
Verify the S3 Transmission Shift Lever moves out of the PARK position when the brake pedal is applied.
- If the the S3 Transmission Shift Lever does not move out of the PARK position
  Refer to Circuit/System Testing.
- Go to next step: If the S3 Transmission Shift Lever does move out of the PARK position
A fault is not currently present and may be an intermittent condition.