Test A: Red Brake Warning Indicator Is Always On

Pinpoint Test A: Red Brake Warning Indicator Is Always On
Refer to Vehicle/Diagrams, Instrument Cluster for schematic and connector information.

Normal Operation
The instrument cluster will illuminate the red brake warning light under 2 conditions. The first condition is when the parking brake is applied and the second condition is when the fluid level in the brake fluid reservoir reaches a predetermined level. The parking brake lever is attached to a normally open switch, when the parking brake is applied the switch closes and connects circuit 162 (LG/RD) and 676 (PK/OG) to circuit 57 (BK) completing a ground path for the instrument cluster. The instrument cluster detects the ground and illuminates the brake warning indicator.

The brake fluid level switch is a normally open switch attached to a flotation device. The instrument cluster sends out a voltage along circuit 531 (DG/YE) which returns to the instrument cluster along circuit 512 (TN/LG). When the brake fluid is at the correct level, the switch remains open and the instrument cluster detects the returning voltage. When the fluid level reaches a predetermined level, the switch closes and connects circuit 531 (DG/YE) and circuit 512 (TN/LG) to ground. The instrument cluster will no longer detect the returning voltage and illuminates the brake warning indicator.

Possible causes
^ Open circuit
^ Short circuit
^ Park brake switch
^ Brake fluid level switch
^ Instrument cluster

PINPOINT TEST A: RED BRAKE WARNING INDICATOR ALWAYS ON

CAUTION: Use the flex probe kit for all test connections to prevent damage to the wiring terminals. Do not use standard multimeter probes.

A1-A3:

A3-A5:

A6: