Brake

Battery voltage is applied to the BRAKE warning Indicator when the ignition switch is in on or start positions. Three switches are used for the ground path to light the BRAKE warning indicator. When any of these switches closes, ground is provided and the indicator lights.

The park brake switch provides a ground signal to the Daytime Running Lamp (DRL) Control Module when the park brake is applied. This signal is then sent from the DRL control module to the Body Control Module (BCM). When the BCM senses that the park brake is applied, the BCM will convey this information along the class II serial data link to the instrument cluster. The instrument cluster will then light the BRAKE warning Indicator for the time in which the park brake is applied.

The brake fluid level indicator switch closes to light the BRAKE warning indicator with a low brake fluid condition in one of the two hydraulic brake fluid reservoirs. This could be caused by a leak in one of the brake lines. The sensor can be reset to OPEN by refilling the reservoir. However, this should only be done after the hydraulic brake system fault is diagnosed and repaired.

The Electronic Brake Traction Control Module (EBTCM) sends a ground signal through circuit 209 to turn on the BRAKE warning indicator and sets a Diagnostic Trouble Code (DTC) when an Antilock Brake System (ABS) failure occurs that affects base brake operation. During initial start-up, the EBTCM will also ground circuit 209 internally to perform a Bulb Test on the BRAKE warning indicator. Refer to General System Description in Antilock Brake System for more information.