Test I: The Brake Warning Indicator Is Never On

PINPOINT TEST I: THE BRAKE WARNING INDICATOR IS NEVER ON

I1-I4:

I4-I6:

I6-I9:

Normal Operation
When the parking brake is applied, the parking brake warning indicator switch grounds circuit CCB09 (GY/BU) to the smart junction box (SJB). 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, and the signal from the SJB on circuit CMC19 (GY/VT) is grounded on circuit GD121 (BK/YE). 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 CCB09 (GY/BU) open
- Circuit CMC19 (GY/VT) open
- Circuit GD121 (BK/YE) open
- Parking brake warning indicator switch
- Brake fluid level switch (part of the brake fluid reservoir)
- SJB
- Instrument cluster