Circuit/System Verification

WARNING: This page is about a different car, the 2019 Buick Cascada, 2018 Buick Cascada, and 2017 Buick Cascada. However, it is still accessible from the selected car via links, so may be relevant.

Ignition ON.
Verify the stop lamps turn On and Off while applying and releasing the brake pedal.
- If the stop lamps do not turn On and Off
  Refer to Symptoms - Lighting .
- Go to next step: If the stop lamps turn On and Off
Verify the B22 Brake Pedal Position Sensor or the brake pedal are not binding causing residual brake pressure to be detected.
- If a condition is found
  Repair or replace the appropriate component.
- Go to next step: If a condition is not found
Verify the scan tool Brake Pedal Position Sensor parameter changes between Active and Inactive while applying and releasing the brake pedal.
- If the parameter does not change
  Replace the K17 Electronic Brake Control Module.
- Go to next step: If the parameter changes
All OK.