Circuit Operation

When the Ignition Switch is turned to "RUN," "BULB TEST" or "START," voltage is applied to the Instrument Cluster through CKT 39 from Gages Fuse 9. The "BRAKE" Indicator receives a ground through CKT 33 by any one of three components: the Park Brake Switch, Brake Malfunction Indicator Lamp Driver Module (from the Electronic Brake Control Module) or the Brake Fluid Level Indicator Sensor.

When the Ignition Switch is turned to "RUN," CKT 33 is grounded through the Brake Malfunction Indicator Module, illuminating the "BRAKE" Indicator for approximately 3 seconds. When the Park Brake is set, the Park Brake Switch closes, grounding CKT 33 through the Park Brake Switch. If the brake fluid level in the brake master cylinder reaches an unacceptably low level, the Brake Fluid Level Indicator Sensor applies a ground to CKT 33. For a better understanding of different conditions during which the Brake Malfunction Indicator Lamp Driver Module will ground CKT 33, refer to Antilock Brake System. Antilock Brakes / Traction Control Systems