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Home >> Chevrolet >> 2002 >> Blazer 4D Utility, 4WD, Part Time >> Repair and Diagnosis >> External Pages >> Different car >> Section 21 (Analog Instrument Panels) >> System Tests >> Test Q: Brake Warning Indicator Inoperative >> Without Daytime Running Lights

Without Daytime Running Lights

WARNING: This page does not describe the selected car, but rather 6 other vehicles, including the 2001 GMC Savana Special, 2001 GMC Savana Camper Special, 2001 GMC Savana, 2001 Chevrolet RV Cutaway, and 2001 Chevrolet Cutaway. However, it is still accessible from the selected car via links, so may be relevant.
  1. If brake warning system diagnostic system description and operation has been reviewed, go to next step. If brake warning system description and operation has not been reviewed, go to BRAKE WARNING  under INDICATORS in OPERATION.
  2. Verify fault exists. If brake warning indicator does not operate properly, go to next step. If brake warning indicator functions normally, check for intermittent or poor connections. Repair as necessary.
  3. Turn ignition switch to OFF position for 5 seconds, then turn ignition switch to RUN position while observing brake warning indicator. If brake warning indicator does not illuminate for 3 seconds and turn off, go to next step. If brake warning indicator illuminates for 3 seconds, then turns off, go to step  5 .
  4. Turn ignition switch to OFF position. Connect scan tool to Data Link Connector (DLC), located below steering column. See Figure . Select 4WAL 3 SENSOR CURRENT DIAGNOSTIC TROUBLE CODES function on scan tool. If scan tool does not display DTC C0288, go to step  10 . If scan tool displays DTC C0288, diagnose and repair anti-lock brake system fault. See appropriate ANTI-LOCK - TRUCKS article in BRAKES.
  5. Apply parking brake. If brake warning indicator does not illuminate, go to next step. If brake warning indicator illuminates, go to step  16 .
  6. Disconnect park brake warning switch harness connector. Connect a jumper wire between ground and park brake warning switch harness connector terminal "A" (Light Blue wire). If brake warning indicator does not illuminate, go to next step. If brake warning indicator illuminates, go to step  8 .
  7. Repair open in Tan/White wire between DRL control module, in-line diode D202 and IPC. After repair, go to step  23 .
  8. Check park brake warning switch connector for intermittent or poor terminal contact. If terminal contact is okay, go to next step. If terminal contact is not okay, repair as necessary. After repair, go to step  23 .
  9. Replace park brake warning switch. After repair, go to step  23 .
  10. Turn ignition switch to OFF position. Disconnect EBCM Black 10-pin harness connector. Connect a jumper wire between ground and EBCM harness connector C1 terminal "H" (Purple wire). Turn ignition switch to RUN position. If brake warning indicator does not illuminate, go to next step. If brake warning indicator illuminates, go to step  21 .
  11. Turn ignition switch to OFF position. Reconnect EBCM harness connector. Remove IPC. Connect a test light between IPC harness connector terminals A13 (Tan/White wire) and B11 (Orange wire). See Figure . Turn ignition switch to RUN position. If test light does not illuminate for 3 seconds, then turn off, go to next step. If test light illuminates for 3 seconds, then turns off, go to step  13 .
  12. Repair open in Purple wire between EBCM and brake pressure differential switch. After repair, go to step  23 .
  13. Check brake warning indicator bulb for an open filament. If bulb is okay, go to next step. If bulb is not okay, replace bulb. After repair, go to step  23 .
  14. Check IPC connector for intermittent or poor terminal contact. If terminal contact is okay, go to next step. If terminal contact is not okay, repair as necessary. After repair, go to step  23 .
  15. Replace IPC. After repair, go to step  23 .
  16. Disconnect differential pressure switch harness connector. Connect a jumper wire between ground and EBCM harness connector C1 terminal "H" (Purple wire). If brake warning indicator does not illuminate, go to next step. If brake warning indicator illuminates, go to step  18 .
  17. Repair open in Purple wire between EBCM and brake pressure differential switch. After repair, go to step  23 .
  18. Check for open in Black wire between ground and brake pressure differential switch. If Black wire is okay, go to next step. If Black wire is not okay, repair as necessary. After repair, go to step  23 .
  19. Check brake pressure differential connector for intermittent or poor terminal contact. If terminal contact is okay, go to next step. If terminal contact is not okay, repair as necessary. After repair, go to step  23 .
  20. Replace brake pressure differential switch. After repair, go to step  23 .
  21. Check EBCM connector for intermittent or poor terminal contact. If terminal contact is okay, go to next step. If terminal contact is not okay, repair as necessary. After repair, go to step  23 .
  22. Replace EBCM. Perform tire size calibration procedure. See appropriate ELECTRONIC BRAKE CONTROL MODULE & BRAKE PRESS in ANTI-LOCK article in BRAKES. After repair, go to next step.
  23. Operate system to verify fault no longer exists. If fault still exists, go to step  3 .
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