Test K: The Brake Warning Indicator Is Never/Always On

PINPOINT TEST K: THE BRAKE WARNING INDICATOR IS NEVER/ALWAYS ON

K1-K4:

K5-K7:

K7-K9:

K9-K11:

K12-K15:

Normal Operation
When the parking brake is applied, circuit 1309 (RD/YE) to the smart junction box (SJB) is grounded by the parking brake switch through circuit 1205 (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, the signal from the SJB on circuit 547 (LG/YE) is routed back to the SJB on circuit 512 (TN/LG). 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 512 (TN/LG) open or short to ground
- circuit 547 (LG/YE) open or short to ground
- circuit 1205 (BK) open
- circuit 1309 (RD/YE) open or short to ground
- parking brake switch
- brake fluid level switch
- SJB
- ABS module
- instrument cluster