When the ignition switch is turned to RUN, BULB TEST or START, voltage is applied to the instrument cluster through CKT 39 from gauges Fuse 9. The brake indicator receives a ground through CKT 33 by one of the following components:

When the ignition switch is turned to RUN, CKT 33 is grounded through the brake malfunction indicator module. The brake indicator illuminates 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 more information on when the brake malfunction indicator lamp driver module will ground CKT 33, refer to Antilock Brake System.