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HOMESERVICE MANUALSCHEVROLET2001CAVALIER LS, 2.4 TREPAIR AND DIAGNOSISSTEERINGSTEERING COLUMNSTEERING WHEEL AND STEERING COLUMNSYSTEM TESTSTEST B: HORNS INOPERATIVE
2001 Chevrolet Cavalier LS, 2.4 T

Test B: Horns Inoperative

2001 Chevrolet Cavalier LS, 2.4 TSECTION Test B: Horns Inoperative
  1. If horns diagnostic system check has been performed, go to next step. If horns diagnostic system check has not been performed, go to HORNS DIAGNOSTIC SYSTEM CHECK  under SELF-DIAGNOSTIC SYSTEM.
  2. Press horn switch on steering wheel. If horns operate normally, go to next step. If horns do not operate normally, go to step  5 .
  3. Turn ignition switch to OFF position. Connect scan tool to Data Link Connector (DLC). DLC is located under left side of instrument panel. Turn ignition switch to RUN position. Using scan tool, command Body Control Module (BCM) horn output On and Off. If horns do not sound continuously, go to next step. If horns sound continuously, horn concern may be intermittent. See PRELIMINARY INSPECTION  under TROUBLE SHOOTING.
  4. Check for open or high resistance in Black wire between BCM harness connector C1 terminal A4 and underhood junction block harness connector C3 terminal C12. See Figure and Figure . If problem is found, go to step  24 . If no problem is found, go to step  13 .
  5. Turn ignition switch to OFF position. Remove horn relay from underhood junction block. Underhood junction block is located at right front corner of engine compartment, near A/C accumulator. Using test light connected to ground, probe horn relay coil voltage supply socket. See WIRING DIAGRAMS  . If test light illuminates, go to next step. If test light does not illuminate, go to step  16 .
  6. Connect test light between horn relay coil voltage supply and horn relay control circuits. See WIRING DIAGRAMS  . Press and hold horn switch. If test light illuminates, go to next step. If test light does not illuminate, go to step  17 .
  7. Using test light connected to ground, probe horn relay switch voltage circuit. See WIRING DIAGRAMS  . If test light illuminates, go to next step. If test light does not illuminate, go to step  18 .
  8. Momentarily connect a fused (15 amp) jumper wire between horn relay switch voltage circuit and horn control circuit. See WIRING DIAGRAMS  . If horns do not sound, go to next step. If horns sound, go to step  14 .
  9. Reinstall horn relay. Disconnect horn assembly 2-pin harness connector. Using a test light connected to ground, probe horn assembly harness connector terminal "B" (Dark Green wire). Press horn switch on steering wheel. If test light illuminates, go to next step. If test light does not illuminate, go to step  19 .
  10. Connect test light between horn assembly harness connector terminals "A" (Black wire) and "B" (Dark Green wire). Press and hold horn switch. If test light illuminates, go to next step. If test light does not illuminate, go to step  20 .
  11. Check for poor, loose or corroded terminals in horn assembly harness connector. If no problem is found, go to next step. If problem is found, repair as necessary and go to step  24 .
  12. Connect a fused (15 amp) jumper wire between the positive battery terminal and underhood junction block harness connector C2 terminal C12. Connect another jumper wire between the negative battery terminal and horn assembly harness connector terminal "A" (Black wire). If horn sounds, go to step  15 . If horn does not sound, go to step  23 .
  13. Check for poor, loose or corroded terminals at BCM harness connector C1. If problem is found, repair as necessary and go to step  24 . If no problem is found, go to step  21 .
  14. Check for poor, loose or corroded terminals in horn relay socket connector. If problem is found, repair as necessary and go to step  24 . If no problem is found, go to step  22 .
  15. Repair high resistance in Dark Green wire between underhood junction block harness connector C2 terminal C12 and horn assembly harness connector terminal "B". Repair high resistance in Black wire between ground horn assembly harness connector terminal "A". Ground point is located on left side of engine compartment, near strut tower. See WIRING DIAGRAMS  . After repairs are made, go to step  24 .
  16. Repair open or high resistance in horn relay coil voltage circuit. See WIRING DIAGRAMS  . After repairs are made, go to step  24 .
  17. Disable air bag system. See AIR BAG RESTRAINT SYSTEMS article. For 2002, see AIR BAG RESTRAINT SYSTEMS article. Repair open or short to voltage in horn relay control circuit. Horn relay control circuit includes horn slip ring and horn switch. See WIRING DIAGRAMS  . After repairs are made, go to step  24 .
  18. Repair open or high resistance in horn relay switch voltage circuit. See POWER DISTRIBUTION article in SYSTEM WIRING DIAGRAMS. For 2002, see POWER DISTRIBUTION article in SYSTEM WIRING DIAGRAMS. After repairs are made, go to step  24 .
  19. Repair open or high resistance in horn control circuit. See WIRING DIAGRAMS  . After repairs are made, go to step  24 .
  20. Repair open or high resistance in horn ground circuit. Ground point is located on left side of engine compartment, near strut tower. See WIRING DIAGRAMS  . After repairs are made, go to step  24 .
  21. Replace BCM. See BODY CONTROL MODULES article. For 2002, see BODY CONTROL MODULES article. After repairs are made, go to step  24 .
  22. Replace horn relay. After repairs are made, go to step  24 .
  23. Replace horn assembly. After repairs are made, go to step  24 .
  24. Operate horns. If horn operates normally, testing is complete. If horns do not operate normally, go to step  1 .
RENDER: 1.0x

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