GM Service Manual Online
For 1990-2009 cars only

Brake Warning System Description P32

BRAKE Lamp

Battery voltage is applied through the GAUGES fuse 8 to the BRAKE indicator when the ignition switch is in the RUN or START positions. The BRAKE indicator illuminates when groundis applied through one of the following circuits:

    • The brake pressure differential switch
    • The ABS system
    • The park brake pedal (or handle) switch
    • The ignition switch, bulb check in START (Canada)

Brake Warning Indicator System (if equipped with the UJ1 option)

This system uses a pair of switches in the hydraulic system to sense whether there is sufficient hydraulic pressure and/or fluid flow for effective brake operation. If either switch opens, the fluid flow indicator/alarm delay module on the parking brake booster provides a ground to the brake indicator as well as to the brake booster fluid flow and pressure alarm, sounding the alarm and lighting the BRAKE indicator to alert the driver that the vehicle's brake system is experiencing a failure.

ABS Lamp and AUTO PARK Lamp

These lamps indicate brake related problems, but not in the foundation brakes. Their functions and circuits are covered in the Antilock Brake System and Park Brake sections respectively.

Brake Warning System Description P42

BRAKE Lamp

Battery voltage is applied through the GAUGES fuse 8 to the BRAKE indicator when the ignition switch is in the RUN or START positions. The BRAKE indicator illuminates whenground applied through one of the following circuits:

    • The brake pressure differential switch
    • The ABS system
    • The park brake pull button switch
    • The park brake actuator switch
    • The ignition switch, bulb check in START (Canada)

ABS Lamp and AUTO PARK Lamp

These lamps indicate brake related problems, but not in the foundation brakes. Their functions and circuits are covered in the Antilock Brake System and Park Brake sections respectively.

Brake Warning System Description P32 Export

BRAKE Lamp

Battery voltage is applied through the GAUGES fuse 8 to the BRAKE indicator when the ignition switch is in the RUN or START positions. The BRAKE indicator illuminates when ground is applied through one of the following circuits:

    • The brake pressure differential switch
    • The ABS system
    • The park brake pull button switch
    • The park brake actuator switch
    • The power brake booster fluid flow alarm circuit

ABS Lamp and AUTO PARK Lamp

These lamps indicate brake related problems, but not in the foundation brakes. Their functions and circuits are covered in the Antilock Brake System and Park Brake sections respectively.