Test I: The Brake Warning Indicator Is Never On

PINPOINT TEST I: THE BRAKE WARNING INDICATOR IS NEVER ON

I1-I3:

I3-I5:

I6-I10:

I11:

Normal Operation
The instrument cluster uses 2 separate strategies to operate the brake warning indicator. 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 or 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 1205 (BK) open
- Circuit 1309 (RD/YE) open
- Parking brake switch
- Brake fluid level switch
- SJB
- ABS module
- Instrument cluster