Astro Van M V6-262 4.3L VIN Z (1994)
Brake Warning Indicator: Initial Inspection and Diagnostic Overview
Preliminary Checks
1. Check condition of BRAKE fuse. If fuse is blown, locate and repair source of overload. replace fuse.
2. Refer to Brakes for the diagnostic circuit check and diagnostic trouble code identification.
3. Check to see that the BLK (2) fusible link is not burned out. replace if burned out.
Circuit Operation
Battery voltage is supplied to the Brake Indicator through the GAGES 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 Warning Switch, Brake Pressure Warning Lamp Switch or the Electronic
Hydraulic Control Unit (EHCU) also called Antilock Electronic Brake Control Module.
The Park Brake Warning Switch closes when the Parking Brake is applied. The Brake Indicator lights to alert the driver.
The Brake Pressure Warning Lamp 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. Refer to Switch reset procedure. This can only be accomplished after the system has
been repaired.
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 the Module through the Stoplamp Switch whenever the brakes are applied. For the Four-Wheel
Antilock Brake System Description and Diagnosis refer to Antilock Brake System See: Antilock Brakes / Traction Control Systems
