Preliminary Inspection

Begin diagnosis with a basic visual inspection of brake fluid level, tire size and other mechanical brake system components which may affect anti-lock operation. Check system sensors, wire harnesses and connectors for proper installation, routing and connection. Ensure all system fuses are okay. Repair as necessary.

If cause of faulty operation cannot be located with basic diagnosis, ABS/TRAC electronic control system must be checked. See DIAGNOSIS & TESTING .

When ignition is turned on, ABS warning light, TRAC OFF indicator and SLIP indicator should come on, then go out after 3 seconds. If indicator lights do not operate as specified, go to ABS WARNING LIGHT , TRAC OFF INDICATOR, TRAC CUT SWITCH  or SLIP INDICATOR LIGHT  under DIAGNOSIS & TESTING.