Test J: The BRAKE Warning Indicator Is Always On

PINPOINT TEST J: THE BRAKE WARNING INDICATOR IS ALWAYS ON

Normal Operation
When the parking brake is applied, circuit 409 (TN/BK) is grounded through the parking brake switch and circuit 57 (BK). The parking brake applied ground is supplied to the instrument cluster (IC) through the brake fluid level switch and circuit 977 (VT/WH). The instrument cluster (IC) receives the ground signal and illuminates the BRAKE warning indicator.

When the brake fluid level is low, circuit 977 (VT/WH) to the instrument cluster (IC) is grounded through the brake fluid level switch and circuit 57 (BK). The instrument cluster (IC) receives the ground signal and illuminates the BRAKE warning indicator.

When a base brake system concern occurs, the ABS module sends a signal to the instrument cluster (IC) over the communication network to illuminate the BRAKE warning indicator. If communication between the instrument cluster (IC) and the ABS module is lost, the instrument cluster (IC) turns on the BRAKE warning indicator.

This pinpoint test is intended to diagnose the following:
- Wiring, terminals or connectors
- Parking brake switch
- Brake fluid level switch
- ABS module
- Instrument cluster (IC)

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J3-J6:

J7-J8: