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Cruise Control Inoperative/Malfunctioning

  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" (Pink wire). If test light illuminates, go to next step. If test light does not illuminate, go to step  35 .
  2. Connect test light to cruise control module harness connector terminal "E" (Black wire). Probe cruise control module harness connector terminal "F" (Pink 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 and cruise control switch to OFF position. Individually probe cruise control module harness connector terminals "A" (Gray wire), "B" (Dark Blue wire) and "C" (Gray/Black wire). See WIRING DIAGRAMS  . If test light does not illuminate, go to next step. If test light illuminates on any circuit(s), go to step  15 .
  4. Turn ignition and cruise control 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. Depress brake pedal while observing 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" (Light Blue wire). If test light illuminates, leave test light connected and go to next step. If test light does not illuminate, go to step  22 .
  10. Depress 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 battery voltage, probe cruise control module harness connector terminal "H" (Dark Green wire). See WIRING DIAGRAMS  . If test light does not illuminate, go to next step. If test light illuminates, go to step  24 .
  12. Following manufacturer's instructions, connect General Motors Tech 2 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 for battery voltage at cruise control module harness connector terminal "J" (White wire). If battery voltage exists, go to next step. If battery voltage does 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 on AC voltage scale. Using DVOM connected to ground, measure voltage at cruise control module harness connector terminal "K" (Dark Green/White wire) while rotating unblocked drive wheel. If voltage varies 0-5 volts, go to step  34 . If voltage is not as described, go to step  27 .
  15. Check circuit(s) which caused test light to illuminate for short to voltage. See WIRING DIAGRAMS  . Repair wire(s) as necessary. After repair, check system for normal operation. If wire(s) is okay, go to step  33 .
  16. Check Gray wire between cruise control module harness connector terminal "A" and cruise control functional switches 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 Pink wire between cruise control module harness connector terminal "F" and A/C CRUISE fuse (15-amp) wiring harness junction block No. 2 for open or high resistance. Repair Pink 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 module harness connector terminal "B" and cruise control functional switches harness connector for open or high resistance. See WIRING DIAGRAMS  . 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 module 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 module harness connector terminal "D" and cruise control release switch or brakelight switch harness connectors for open or high resistance. See WIRING DIAGRAMS  . 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 module harness connector terminal "D" and cruise control release switch or brakelight switch harness connectors 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 Light Blue wire between cruise control module harness connector terminal "G" and brakelight switch harness connector for short to voltage. Repair Light Blue wire as necessary. After repair, check system for normal operation. If wire is okay, go to step  29 .
  23. Check Light Blue wire between cruise control module harness connector terminal "G" and brakelight switch harness connector for open or high resistance. See WIRING DIAGRAMS  . Repair Light Blue 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 module 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 module 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 White wire between cruise control module harness connector terminal "J" and PCM harness connector for open or high resistance. See WIRING DIAGRAMS  . Repair White 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 module 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 and clutch switches for proper adjustment. See CRUISE CONTROL RELEASE (ABS/TCC) SWITCH & BRAKELIGHT SWITCH  and/or CRUISE CONTROL CLUTCH ANTICIPATE SWITCH & CRUISE CONTROL CLUTCH SWITCH  under ADJUSTMENTS. Adjust switch(es) as necessary. After repair, check system for normal operation. If adjustment is okay, go to step  30 .
  29. Check brakelight switch for proper adjustment. See CRUISE CONTROL RELEASE (ABS/TCC) SWITCH & BRAKELIGHT SWITCH  under ADJUSTMENTS. Adjust switch as necessary. After repair, check system for normal operation. If adjustment is okay, go to step  31 .
  30. Check for poor connections or connector damage at cruise control release and clutch switch harness connectors. Repair or replace as necessary. If no problem is found, go to step  37 .
  31. Check for poor connections or connector damage at brakelight switch harness connector. Repair or replace as necessary. If no problem is found, go to step  38 .
  32. Check for poor connections or connector damage at PCM harness connector. Repair or replace as necessary. If no problem is found, go to step  39 .
  33. Check for poor connections or connector damage at cruise control functional switches harness connector. Repair as necessary. If no problem is found, go to step  40 .
  34. Check for poor connections or connector damage at cruise control module harness connector. Repair as necessary. If no problem is found, go to step  41 .
  35. Repair Pink wire as necessary. See WIRING DIAGRAMS  . 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 and/or cruise control clutch switch. See CRUISE CONTROL RELEASE (ABS/TCC) SWITCH & BRAKELIGHT SWITCH  and/or CRUISE CONTROL CLUTCH ANTICIPATE SWITCH & CRUISE CONTROL CLUTCH SWITCH  under REMOVAL & INSTALLATION. After repair, check system for normal operation.
  38. Replace brakelight switch. See CRUISE CONTROL RELEASE (ABS/TCC) 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 functional switches. See 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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