Test J: The Brake Warning Indicator is Never On

PINPOINT TEST J: THE BRAKE WARNING INDICATOR IS NEVER ON

J1-J2:

J2-J4:

J5-J8:

Normal Operation
The instrument cluster uses 3 strategies to operate the brake warning indicator; parking brake status, brake fluid level, and the base brake system integrity. When the parking brake is applied, circuit 162 (LG/RD) to the instrument cluster is grounded by the parking brake switch through circuit 57 (BK). The instrument cluster receives the ground signal and illuminates the brake warning indicator. When the brake fluid level switch is disconnected, or the brake fluid level is low, the instrument cluster receives the data from circuit 512 (TN/LG) and circuit 531 (DG/YE) and illuminates the brake warning indicator. When a base brake system concern is detected, the anti-lock brake system (ABS) module sends a ground signal to the instrument cluster and the instrument cluster responds by illuminating the brake system warning indicator.

Possible Causes
- circuit 57 (BK) open
- circuit 162 (LG/RD) open
- circuit 512 (TN/LG) short to ground
- circuit 531 (DG/YE) short to ground
- parking brake switch
- brake fluid level switch
- instrument cluster