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Home >> GMC >> 2003 >> Safari Van Cargo, AWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 63 (Disc Brakes & Drum Brakes) >> Symptom Testing >> Brake Warning Indicator Inoperative >> Without DRL

Without DRL

WARNING: This page is about a different car, the 2002 GMC Savana Special, 2002 GMC Savana Camper Special, 2002 GMC Savana, and 2002 Chevrolet Chevy Express. However, it is still accessible from the selected car via links, so may be relevant.
  1. Did you review the SYMPTOMS - HYDRAULIC BRAKE? If so go to next step. If not, go to SYMPTOMS - HYDRAULIC BRAKE  .
  2. Verify a fault is present. Does the brake warning indicator function normally? If so, condition is intermittent. Go to INTERMITTENT  . If not, go to next step.
  3. Turn OFF the ignition for 5 seconds. Turn ON the ignition while observing the brake warning indicator. Does the brake warning indicator illuminate for 3 seconds and then turn OFF? If so go to step  5 . If not go to next step.
  4. Install a scan tool. Select the 4WAL 3 SENSOR CURRENT DIAGNOSTIC TROUBLE CODE(S) function on the scan tool. Does the scan tool display DTC C0288? If so go to Anti-Lock Brake System. If not go to step  10 .
  5. Apply the park brake. Does the brake warning indicator illuminate? If so go to step  16 . If not go to next step.
  6. Disconnect the park brake warning switch harness connector. See PARK BRAKE WARNING LAMP SWITCH  . Connect a jumper wire between the park brake warning switch harness connector and a good ground. Does the brake warning indicator illuminate? If so go to step  8 . If not go to next step.
  7. Repair the open in the brake warning indicator control circuit. After repairs are complete, go to step  23 .
  8. Inspect for poor connections at the harness connector of the park brake warning switch. Did you find and correct the condition? If so go to step  8 . If not go to next step.
  9. Replace the park brake warning switch. See PARK BRAKE WARNING LAMP SWITCH  . After repairs are complete, go to step  8 .
  10. Turn OFF the ignition. Disconnect the EBCM 10-way harness connector. Connect a jumper wire between the ABS pressure differential sensor signal circuit and a good ground. Turn ON the ignition. Does the brake warning indicator illuminate? If so go to step  21 . If not go to next step.
  11. Turn OFF the ignition. Reconnect the EBCM 10-way harness connector. Remove the instrument panel cluster. See INSTRUMENT PANEL CLUSTER REPLACEMENT . Connect a test lamp between the battery positive voltage circuit and the brake warning indicator control circuit at the instrument panel cluster (IPC) harness connector. Turn ON the ignition. Does the test lamp illuminate for 3 seconds and then turn OFF? If so go to step  13 . If not go to next step.
  12. Repair the open in the brake warning indicator control circuit or the ABS pressure differential sensor signal circuit. After repairs are complete, go to step  23 .
  13. Inspect the brake warning indicator lamp for an open (burned out) filament. Did you find and correct the condition? If so go to step  23 . If not go to next step.
  14. Inspect for poor connections at the harness connector of the IPC. Did you find and correct the condition? If so go to step  23 . If not go to next step.
  15. Replace the instrument panel cluster. See INSTRUMENT PANEL CLUSTER REPLACEMENT . After repairs are complete, go to step  23 .
  16. Disconnect the differential pressure switch harness connector. See COMBINATION VALVE  . Connect a jumper wire between the ABS pressure differential sensor signal circuit and a good ground. Does the brake warning indicator illuminate? If so go to step  18 . If not go to next step.
  17. Repair the open in the ABS pressure differential sensor signal circuit. After repairs are complete, go to step  23 .
  18. Test the ground circuit of the brake pressure differential switch for an open. Did you find and correct the condition? If so go to step  23 . If not go to next step.
  19. Inspect for poor connections at the harness connector of the brake pressure differential switch. Did you find and correct the condition? If so go to step  23 . If not go to next step.
  20. Replace the brake pressure differential switch. See COMBINATION VALVE  . After repairs are complete, go to step  23 .
  21. Inspect for poor connections at the harness connector of the EBCM. Did you find and correct the condition? If so go to step  23 . If not go to next step.
  22. Replace the EBCM. See Electronic Brake Control Module (EBCM) Replacement in Anti-Lock Brake System. Following EBCM replacement, use the scan tool to perform the Tire Size Calibration procedure. After repairs are complete, go to next step.
  23. Verify the system is repaired. Does the brake warning indicator function normally? If so, system is okay. If system is not okay, go to step  3 .
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