Test J: The Brake Warning Indicator Is Never On

PINPOINT TEST J: THE BRAKE WARNING INDICATOR IS NEVER ON

J1-J2:

J3-J6:

J6-J8:

Normal Operation
The instrument cluster uses 3 strategies to operate the brake warning indicator; parking brake status, brake fluid level, and the base brake system integrity. When the parking brake is applied, circuit 162 (LG/RD) to the instrument cluster is grounded by the parking brake switch through circuit 57 (BK). The instrument cluster receives the ground signal and illuminates the brake warning indicator. When the brake fluid level switch is disconnected, or the brake fluid level is low, the instrument cluster receives the data from circuits 512 (TN/LG) and 531 (DG/YE) and illuminates the brake warning indicator.

NOTE: The brake fluid level switch is part of the master cylinder and is not installed separately.

Possible Causes
- Circuit 57 (BK) open
- Circuit 162 (LG/RD) open
- Circuit 512 (TN/LG) and circuit 531 (DG/YE) short together
- Parking brake switch
- Brake fluid level switch (part of the master cylinder)
- Instrument cluster