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Cruise Control Inoperative/Malfunctioning

NOTE: To avoid misdiagnosis, ensure preliminary inspection and all checks have been performed. See TROUBLE SHOOTING  .
  1. Turn ignition switch to OFF position. Disconnect cruise control module harness connector. Turn ignition switch to ON position. Using a test light connected to ground, probe cruise control module harness connector terminal "F" (Brown wire). See WIRING DIAGRAMS  . If test light illuminates, go to next step. If test light does not illuminate, go to step  35 .
  2. Using a test light connected to cruise control harness connector terminal "E" (Black wire), probe cruise control module harness connector terminal "F" (Brown wire). If test light illuminates, go to next step. If test light does not illuminate, go to step  36 .
  3. Turn ignition switch to ON position. Turn cruise control main switch to OFF position. Using a test light connected to ground, individually probe cruise control module harness connector terminals "A" (Gray wire), "B" (Dark Blue wire) and "C" (Gray/Black wire). If test light does not illuminate, go to next step. If test light illuminates at any connection, go to step  15 .
  4. Turn ignition and cruise control main switches to ON position. Using a test light connected to ground, probe cruise control module harness connector terminal "A" (Gray wire). If test light illuminates, go to next step. If test light does not illuminate, go to step  16 .
  5. Using a test light connected to ground, probe cruise control module harness connector terminal "B" (Dark Blue wire). If test light illuminates, go to next step. If test light does not illuminate, go to step  18 .
  6. Using a test light connected to ground, probe cruise control module harness connector terminal "C" (Gray/Black wire). If test light illuminates, go to next step. If test light does not illuminate, go to step  19 .
  7. Using a test light connected to ground, probe cruise control module harness connector terminal "D" (Brown wire). If test light illuminates, leave test light connected and go to next step. If test light does not illuminate, go to step  20 .
  8. Press brake pedal and observe test light. If test light does not illuminate, go to next step. If test light illuminates, go to step  21 .
  9. Using a test light connected to ground, probe cruise control module harness connector terminal "G" (White wire). If test light does not illuminate, leave test light connected and go to next step. If test light illuminates, go to step  22 .
  10. Press brake pedal while observing test light. If test light illuminates, go to next step. If test light does not illuminate, go to step  23 .
  11. Using a test light connected to ground, probe cruise control module harness connector terminal "H" (Dark Green wire). If test light does not illuminate, go to next step. If test light illuminates, go to step  24 .
  12. Following manufacturer's instructions, connect GM Tech II scan tool. Command CRUISE INHIBIT/ENABLE OFF. If test light illuminates, go to next step. If test light does not illuminate, go to step  25 .
  13. Using a DVOM connected to ground, check voltage at cruise control module harness connector terminal "J" (Light Blue/Black wire). If battery voltage exists, go to next step. If battery voltages not exist, go to step  26 .
  14. Raise and support vehicle so drive wheels may be rotated. Block one drive wheel. Set gear selector in DRIVE position. Set DVOM to volts AC scale. Using DVOM connected to ground, probe cruise control module harness connector terminal "K" while rotating unblocked drive wheel. If voltage varies 0-5 volts, go to step  34 . If voltage does not vary as specified, go to step  27 .
  15. Check wire that illuminated test light for short to voltage. See WIRING DIAGRAMS  . Repair wire as necessary. After repair, check system for normal operation. If condition still exists, go to step  33 .
  16. Check Gray wire between cruise control harness connector terminal "A" and cruise control main switch harness connector for open or high resistance. Repair Gray wire as necessary. After repair, check system for normal operation. If wire is okay, go to next step.
  17. Check Brown wire between cruise control harness connector terminal "F" and CRUISE fuse (10-amp) located in instrument panel fuse block for open or high resistance. Repair Brown wire as necessary. After repair, check system for normal operation. If wire is okay, go to step  33 .
  18. Check Dark Blue wire between cruise control harness connector terminal "B" and cruise control functional switches harness connector for open or high resistance. Repair Dark Blue wire as necessary. After repair, check system for normal operation. If wire is okay, go to step  33 .
  19. Check Gray/Black wire between cruise control harness connector terminal "C" and cruise control functional switches harness connector for open or high resistance. Repair Gray/Black wire as necessary. After repair, check system for normal operation. If wire is okay, go to step  33 .
  20. Check Brown wire between cruise control release switch harness connector and cruise control module harness connector terminal "D" for open or high resistance. Repair Brown wire as necessary. After repair, check system for normal operation. If wire is okay, go to step  28 .
  21. Check Brown wire between cruise control release switch harness connector and cruise control module harness connector terminal "D" for short to voltage. Repair Brown wire as necessary. After repair, check system for normal operation. If wire is okay, go to step  28 .
  22. Check White wire between brakelight switch harness connector and cruise control module harness connector terminal "G" for short to voltage. Repair White wire as necessary. After repair, check system for normal operation. If wire is okay, go to step  29 .
  23. Check White wire between brakelight switch harness connector and cruise control module harness connector terminal "G" for open or high resistance. Repair White wire as necessary. After repair, check system for normal operation. If wire is okay, go to step  29 .
  24. Check Dark Green wire between cruise control harness connector terminal "H" and PCM harness connector for short to ground. Repair Dark Green wire as necessary. After repair, check system for normal operation. If wire is okay, go to step  32 .
  25. Check Dark Green wire between cruise control harness connector terminal "H" and PCM harness connector for open or high resistance. Repair Dark Green wire as necessary. After repair, check system for normal operation. If wire is okay, go to step  32 .
  26. Check Light Blue/Black wire between cruise control harness connector terminal "J" and PCM harness connector for open or high resistance. Repair Light Blue/Black wire as necessary. After repair, check system for normal operation. If wire is okay, go to step  32 .
  27. Check Dark Green/White wire between cruise control harness connector terminal "K" and PCM harness connector for open or high resistance. Repair Dark Green/White wire as necessary. After repair, check system for normal operation. If wire is okay, go to step  32 .
  28. Check cruise control release switch for proper adjustment. See CRUISE CONTROL RELEASE SWITCH & BRAKELIGHT SWITCH  under ADJUSTMENTS. Adjust switch if necessary. If adjustment is okay, go to step  30 .
  29. Check brakelight switch for proper adjustment. See CRUISE CONTROL RELEASE SWITCH & BRAKELIGHT SWITCH  under ADJUSTMENTS. Adjust switch if necessary. If adjustment is okay, go to step  31 .
  30. Check for poor connections or connector damage at cruise control release switch harness connector. Repair as necessary. After repair, check system for normal operation. If connections are okay, go to step  37 .
  31. Check for poor connections or connector damage at brakelight switch harness connector. Repair as necessary. After repair, check system for normal operation. If connections are okay, go to step  38 .
  32. Check for poor connections or connector damage at PCM harness connector. Repair as necessary. After repair, check system for normal operation. If connections are okay, go to step  39 .
  33. Check for poor connections or connector damage at cruise control main switch and cruise control functional switch harness connectors. Repair as necessary. After repair, check system for normal operation. If connections are okay, go to step  40 .
  34. Check for poor connections or connector damage at cruise control module harness connector. Repair as necessary. After repair, check system for normal operation. If connections are okay, go to step  41 .
  35. Repair Brown wire between cruise control module harness connector terminal "F" and CRUISE fuse (10-amp) in instrument panel fuse block. After repair, check system for normal operation.
  36. Repair Black wire between cruise control module harness connector terminal "E" and chassis ground. After repair, check system for normal operation.
  37. Replace cruise control release switch. See CRUISE CONTROL RELEASE SWITCH & BRAKELIGHT SWITCH  under REMOVAL & INSTALLATION. After repair, check system for normal operation.
  38. Replace brakelight switch. See CRUISE CONTROL RELEASE SWITCH & BRAKELIGHT SWITCH  under REMOVAL & INSTALLATION. After repair, check system for normal operation.
  39. Replace and program PCM. See appropriate SELF-DIAGNOSTICS article in ENGINE PERFORMANCE. After repair, check system for normal operation.
  40. Replace cruise control main switch and/or cruise control functional switches. See CRUISE CONTROL MAIN SWITCH  and/or CRUISE CONTROL FUNCTIONAL SWITCHES  under REMOVAL & INSTALLATION. After repair, check system for normal operation.
  41. Replace cruise control module. See CRUISE CONTROL MODULE  under REMOVAL & INSTALLATION. After repair, check system for normal operation. If system still malfunctions, return to step  1 .
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