Regal V6-3.8L VIN K (1997)
Brake Warning Indicator: Description and Operation
Battery voltage is applied to the BRAKE warning indicator when the ignition switch is in the RUN. BULB TEST or START positions. Three signals are
used to control the BRAKE warning indicator. When any of these signals determine that a fault is present, ground is provided and the indicator lights.
The park brake indicator switch provides a ground signal through circuit 1830 to the Daytime Running Lamp (DRL) control module when the park brake
is applied. The DRL control module then sends the signal through circuit 233 to the Body Control Module (BCM). When the BCM senses that the park
brake is applied, the BCM will convey this information along the serial data (class 11) line 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 low brake fluid in either 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 system fault is diagnosed and repaired.
The EBCM/EBTCM closes to light the BRAKE warning indicator and sets a diagnostic trouble code when an Antilock Brake System (ABS) failure
occurs that affects the base brake operation. During initial start-up, the EBCM/EBTCM will also ground circuit 209 internally to perform a bulb test on
the BRAKE warning indicator.
