Test J: the Brake Warning Indicator Is Never on

PINPOINT TEST J: THE BRAKE WARNING INDICATOR IS NEVER ON

J1-J4:

J4-J6:

J6-J8:

J8-J11:

Normal Operation
The instrument cluster uses 3 strategies to operate the red brake warning indicator; parking brake status, brake fluid level, and the base brake system integrity. When the parking brake is applied, circuit 511 (LG) to the smart junction box (SJB) is grounded by the parking brake switch through circuit 57 (BK). The SJB receives the ground signal and sends the instrument cluster a message over the communication network to illuminate the brake warning indicator. When the brake fluid level is low, the brake fluid level switch closes, circuit 547 (LG/YE) is grounded to the SJB by the brake fluid level switch on circuit 57 (BK). The SJB receives the ground signal and sends the instrument cluster a message over the communication network to illuminate the brake warning indicator. When a base brake system concern is detected, the anti-lock brake system (ABS) module sends a signal to the instrument cluster over the communication network to illuminate the brake system warning indicator.

Possible Causes
- circuit 57 (BK) open
- circuit 511 (LG) open
- circuit 547 (LG/YE) open
- parking brake switch
- brake fluid level switch
- SJB
- instrument cluster