ABS Circuit Description

Battery voltage is supplied to the Brake Indicator through the IGN/GAU Fuse and the PNK/BLK (39) wire when the Ignition Switch is in RUN or START. Ground is provided through the TAN/WHT (33) wire by the Park Brake Switch, Brake Pressure Warning Switch or the Antilock Brake Module.

The Park Brake Switch closes when the Park Brake is applied. The Brake Indicator lights to alert the driver.

The Brake Pressure Switch closes to light the Brake Indicator when there is low brake fluid pressure in one of the two hydraulic brake systems. This could be caused by a leak in one of the brake lines. Reset the switch after repairing the system.

The Rear Wheel Antilock Brake Module grounds the Brake Indicator when the Module senses a malfunction in the Antilock Brake System. The Four-Wheel Antilock Brake Module grounds the Brake Indicator when the module senses certain malfunctions in the hydraulic portion of the system. The Four-Wheel Antilock Brake Module grounds the Antilock Indicator when the module senses a malfunction in the electrical or electronic portion of the system. Brake voltage input is supplied to both Modules through the Stoplamp Switch whenever the brakes are applied. This voltage is supplied through a Diode Module.