Test R

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

Test R1:

Test R2-R3:

Test R4-R5:

Test R6-R7:

Test R8-R10:

Test R11:

Normal Operation
The instrument cluster utilizes two separate strategies to operate the brake warning indicator. When the parking brake is applied, circuit 162 (LG/RD) to the instrument cluster is grounded by the parking brake switch through circuit 1203 (BK/LB). The instrument cluster receives the ground signal and turns on the brake warning indicator. When the brake fluid level is low or a base brake system concern is detected, the ABS module sends a signal to the instrument cluster over the standard corporate protocol (SCP) communication network, circuits 914 (TN/OG) and 915 (PK/LB), to turn on the brake system warning indicator.

Possible Causes
- circuit 162 (LG/RD) open or shorted to power
- circuit 512 (TN/LG) short to ground
- circuit 977 (VT/WH) short to ground
- circuit 1203 (BK/LB) open
- circuit 1205 (BK) open
- parking brake switch
- brake fluid level switch
- ABS module
- instrument cluster