Pinpoint Test 7

PINPOINT TEST 7: THE BRAKE WARNING INDICATOR IS NEVER/ALWAYS ON

Step 1 - 5:

Step 6 - 11:

Step 12 - 16:

Step 17:

Normal Operation
The brake fluid level switch is hardwired to the ABS module through circuit (V/Y) and return circuit (T/LG). When the brake fluid level is low, the ABS module sends a command to the instrument cluster over the CAN circuits, to illuminate the brake warning indicator. The parking brake switch is hardwired to the SJB through circuit (LG/R) and is grounded through the parking brake assembly When the parking brake is applied, the SJB sends a command to the instrument cluster over the CAN to illuminate the brake warning indicator. The ABS module monitors the brake pressures within the base brake system and provides a message to the instrument cluster over the CAN when a concern exists. If the instrument cluster loses, communication with the ABS module, the instrument cluster illuminates the brake warning indicator.

Possible Causes
- circuit (LG/R) open or short to ground.
- circuit (T/LG) open short to ground.
- parking brake switch.
- brake fluid level switch.
- ABS module.
- instrument cluster.