Road Test
- Turn ignition on. Note if Red BRAKE warning light and Amber ABS warning light come on. Warning lights are located on instrument cluster. Both warning lights should momentarily come on as a bulb check, and then go off. If Red BRAKE warning light does not operate properly, go to next step. If Amber ABS warning light does not operate properly, go to step 3 . If warning lights operate properly, go to step 4 .
- If Red BRAKE warning light does not come on momentarily, diagnose Red BRAKE warning light circuit. See WIRING DIAGRAMS . If Red BRAKE warning light remains on steady with ignition on, diagnose base brake system. See appropriate DISC & DRUM article.
- If Amber ABS warning light does not come on momentarily, perform TEST 1A: ABS WARNING LIGHT under DIAGNOSTIC TESTS. If Amber ABS warning light remains on steady, retrieve and record Diagnostic Trouble Codes (DTC), and then clear DTCs from Controller Anti-Lock Brake (CAB). See RETRIEVING DIAGNOSTIC TROUBLE CODES and CLEARING DIAGNOSTIC TROUBLE CODES .
- Drive vehicle at a speed of at least 12 MPH and note if Amber ABS warning light comes on steady. If Amber ABS warning light does not come on, go to next step. If Amber ABS warning light comes on steady, retrieve DTCs. See RETRIEVING DIAGNOSTIC TROUBLE CODES .
- Continue driving vehicle. Ensure vehicle attains a speed of 40 MPH. Bring vehicle to at least one complete stop, and then again accelerate to at least 25 MPH. If Amber ABS warning light comes on steady, retrieve DTCs. See RETRIEVING DIAGNOSTIC TROUBLE CODES .