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Cruise Control Inoperative/Malfunctioning

  1. Following manufacturer's instructions, connect GM Tech I or Tech II scan tool. Perform DIAGNOSTIC SYSTEM CHECK. See appropriate SELF-DIAGNOSTIC article in ENGINE PERFORMANCE. If DIAGNOSTIC SYSTEM CHECK has been performed, go to next step.
  2. Turn ignition switch to OFF position. Disconnect cruise control module harness connector. Turn ignition switch to ON position. Using test light connected to ground, 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. Using test light connected to cruise control module 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  37 .
  4. Turn ignition and cruise control switches to OFF position. Using test light connected to ground, individually probe cruise control module harness connector terminals "B" (Dark Blue wire) and "C" (Gray/Black wire). If test light does not illuminate, go to next step. If test light illuminates on either circuit, go to step  16 .
  5. Turn ignition and cruise control switches to ON position. Using 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  17 .
  6. Using test light connected to ground, probe cruise control module harness connector terminal "B" (Dark Blue wire). Press and hold SET/CRUISE button. If test light illuminates, go to next step. If test light does not illuminate, go to step  19 .
  7. Using test light connected to ground, probe cruise control module harness connector terminal "C" (Gray/Black wire). Press and hold RESUME/ACCEL button. If test light illuminates, go to next step. If test light does not illuminate, go to step  20 .
  8. Using test light connected to ground, probe cruise control module harness connector terminal "D" (Purple wire). If test light illuminates, leave test light connected and go to next step. If test light does not illuminate, go to step  21 .
  9. Press brake pedal while observing test light. If test light does not illuminate, go to next step. If test light illuminates, go to step  22 .
  10. Using test light connected to ground, probe cruise control module harness connector terminal "G" (Light Blue wire). If test light does not illuminate, leave test light connected and go to next step. If test light illuminates, go to step  23 .
  11. Depress brake pedal while observing test light. If test light illuminates, go to next step. If test light does not illuminate, go to step  24 .
  12. Using test light connected to battery voltage, probe cruise control module harness connector terminal "H" (Dark Green wire). If test light does not illuminate, leave test light connected and go to next step. If test light illuminates, go to step  25 .
  13. Using manufacturer's instructions, connect GM Tech I or 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  26 .
  14. Using 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 voltage does not exist, go to step  27 .
  15. Raise and support vehicle so that drive wheels may be rotated. Block one drive wheel. Using DVOM connected to ground, probe cruise control module harness connector terminal "K" (Dark Green/White wire). Observe voltage reading while rotating unblocked drive wheel. If voltage varies 0-5 volts, go to step  35 . If voltage does not vary 0-5 volts, go to step  28 .
  16. Check wire that caused test light to illuminate for short to voltage. After repair, go to step  43 . If wire(s) is okay, go to step  34 .
  17. Check Gray wire between cruise control module harness connector terminal "A" and cruise control functional switches harness connector terminal "D" for open or high resistance. Repair Gray wire as necessary. After repair, go to step  43 . If wire is okay, go to next step.
  18. Check Brown wire between CRUISE SW fuse (2-amp) harness connector at right instrument panel junction block and cruise control functional switches harness connector terminal "A" for open or high resistance. Repair Brown wire as necessary. After repair, go to step  43 . If wire is okay, go to step  34 .
  19. Check Dark Blue wire between cruise control module harness connector terminal "B" and cruise control functional switches harness connector terminal "B" for open or high resistance. Repair Dark Blue wire as necessary. After repair, go to step  43 . If wire is okay, go to step  34 .
  20. Check Gray/Black wire between cruise control module harness connector terminal "C" and cruise control functional switches harness connector terminal "C" for open or high resistance. Repair Gray/Black wire as necessary. After repair, go to step  43 . If wire is okay, go to step  34 .
  21. Check Purple wire between cruise control module harness connector terminal "D" and cruise control brake switch harness connector terminal "B" for open or high resistance. Repair Purple wire as necessary. After repair, go to step  43 . If wire is okay, go to step  29 .
  22. Check Purple wire between cruise control module harness connector terminal "D" and cruise control brake switch harness connector terminal "B" for short to voltage. Repair Purple wire as necessary. After repair, go to step  43 . 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 short to voltage. Repair Light Blue wire as necessary. After repair, go to step  43 . If wire is okay, go to step  30 .
  24. Check Light Blue wire between cruise control module harness connector terminal "G" and brakelight switch harness connector for open or high resistance. Repair Light Blue wire as necessary. After repair, go to step  43 . If wire is okay, go to step  30 .
  25. Check Dark Green wire between cruise control module harness connector terminal "H" and PCM harness connector C1 terminal No. 72 for short to ground. Repair Dark Green wire as necessary. After repair, go to step  43 . If wire is okay, go to step  33 .
  26. Check Dark Green wire between cruise control module harness connector terminal "H" and PCM harness connector C1 terminal No. 72 for open, high resistance or short to voltage. Repair Dark Green wire as necessary. After repair, go to step  43 . If wire is okay, go to step  33 .
  27. Check Light Blue/Black wire between cruise control module harness connector terminal "J" and PCM harness connector C2 terminal No. 59 for open, high resistance or short to voltage. Repair Light Blue/Black wire as necessary. After repair, go to step  43 . If wire is okay, go to step  33 .
  28. Check Dark Green/White wire between PCM harness connector C1 terminal No. 65 and cruise control module harness connector terminal "K" for open or high resistance. Repair Dark Green/White wire as necessary. After repair, go to step  43 . If wire is okay, go to step  33 .
  29. Check cruise control brake switch for proper adjustment. See BRAKELIGHT SWITCH & CRUISE CONTROL BRAKE SWITCH  under ADJUSTMENTS. Adjust cruise control brake switch if necessary. After repair, go to step  43 . If adjustment is okay, go to step  31 .
  30. Check brakelight switch for proper adjustment. See BRAKELIGHT SWITCH & CRUISE CONTROL BRAKE SWITCH  under ADJUSTMENTS. Adjust brakelight switch if necessary. After repair, go to step  43 . If adjustment is okay, go to step  32 .
  31. Check for poor connection or connector damage at cruise control brake switch. Repair or replace as necessary. After repair, go to step  43 . If connection is okay, go to step  38 .
  32. Check for poor connection or connector damage at brakelight switch. Repair or replace as necessary. After repair, go to step  43 . If connection is okay, go to step  39 .
  33. Check for poor connection or connector damage at PCM harness connectors. Repair or replace as necessary. After repair, go to step  43 . If connections are okay, go to step  40 .
  34. Check for poor connection or connector damage at cruise control functional switches harness connectors. Repair or replace as necessary. After repair, go to step  43 . If connections are okay, go to step  41 .
  35. Check for poor connection or connector damage at cruise control module harness connector. Repair or replace as necessary. After repair, go to step  43 . If connections are okay, go to step  42 .
  36. Repair Brown wire between cruise control module harness connector terminal "F" and right instrument panel junction block CRUISE fuse (10-amp) harness connector C1 terminal B4. After repair, go to step  43 .
  37. Repair Black wire between cruise control module harness connector terminal "E" and ground. See WIRING DIAGRAMS  . After repair, go to step  43 .
  38. Replace cruise control brake switch. See CRUISE CONTROL BRAKE SWITCH  under REMOVAL & INSTALLATION. After repair, go to step  43 .
  39. Replace brakelight switch. See BRAKELIGHT SWITCH  under REMOVAL & INSTALLATION. After repair, go to step  43 .
  40. Replace PCM. See POWERTRAIN CONTROL MODULE (PCM)  under REMOVAL & INSTALLATION. Program replacement PCM using appropriate equipment and latest software. See COMPUTER RELEARN PROCEDURES article in GENERAL INFORMATION. After repair, go to step  43 .
  41. Replace cruise control functional switches. See CRUISE CONTROL FUNCTIONAL SWITCHES  under REMOVAL & INSTALLATION. After repair, go to step  43 .
  42. Replace cruise control module. See CRUISE CONTROL MODULE  under REMOVAL & INSTALLATION. After repair, go to next step.
  43. Road test vehicle at speeds greater than 25 MPH. Operate cruise control system. If cruise control system operates normally, repairs are complete. If cruise control system still malfunctions, return to step  2 .
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