Test A: The Red Brake Warning Indicator Is Always On
Pinpoint Test A: The Red Brake Warning Indicator Is Always OnNormal Operation
The red brake warning indicator is located in the instrument cluster and illuminates when the brake fluid in the brake master cylinder reservoir is below a specific level or when the parking brake is engaged. When the parking brake is applied, the instrument cluster receives a ground input on circuit 1309 (RD/YE) through the parking brake switch and circuit 1205 (BK), turning on the brake warning indicator. The smart junction box (SJB) provides a voltage to the brake fluid level switch through circuit 1305 (DB) and back through the SJB return circuit 512 (TN/LG). When the brake fluid level is low, the brake fluid level switch closes to circuit 512 (TN/LG). The voltage reference signal the SJB is sending to the brake fluid level switch drops to zero, then the SJB sends an SCP message to the instrument cluster to turn on the brake warning indicator.
Possible Causes
^ Circuit 547 (LG/YE) short to ground
^ Circuit 1309 (RD/YE) short to ground
^ Low brake fluid level
^ Brake fluid level switch
^ Parking brake engaged
^ Parking brake switch
^ Instrument cluster
^ SJB
A1-A3:
A3-A5:
A6-A8:
