Grand AM L4-138 2.3L DOHC VIN D MFI (1994)
Brake Warning Indicator: Description and Operation
Brake Warning System
CIRCUIT OPERATION
Battery voltage is applied to the BRAKE Indicator when the Ignition Switch is in "RUN," "BULB TEST" or "START." Three switches are connected to
the BRAKE Indicator. When any one of these switches closes, ground is provided and the indicator lights.
The Ignition Switch provides a ground when it is in the "BULB TEST" and "START" positions.
The Park Brake Switch provides a ground when the Park Brake is applied.
The Brake Fluid Level Switch closes to light the BRAKE Indicator when there is low brake fluid in one of the two hydraulic brake systems. This could
be caused by a leak in one of the brake lines. The switch can be reset to an open position by refilling the reservoir; however, this can only be
accomplished after the faulty system has been repaired.
The Electronic Brake Control Module (EBCM) provides a ground for the BRAKE Indicator light only when the Antilock Brake system degrades the
base brake system.
In cars with Daytime Running Lights, the Daytime Running Lights remain OFF until the BRAKE Indicator goes out (circuit 33 open to ground).
