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Cruise Control Inoperative/Malfunctioning

  1. Following manufacturer's instructions, install scan tool. Check for any Diagnostic Trouble Codes (DTCs) which could effect operation of cruise control. If no DTCs exist, go to next step. If any DTCs exist, go to appropriate SELF-DIAGNOSTICS article in ENGINE PERFORMANCE.
  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" (Pink wire). See WIRING DIAGRAMS  . 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" (Pink wire). See WIRING DIAGRAMS  . If test light illuminates, go to next step. If test light does not illuminate, go to step  37 .
  4. Turn ignition switch to ON position. Turn cruise control functional switches to OFF position. Using test light connected to ground, 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  16 .
  5. Turn ignition and cruise control functional 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. With ignition and cruise control functional switches set to ON position, probe cruise control module harness connector terminal "B" (Dark Blue wire) using test light connected to ground. Press and hold SET/COAST switch. 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 SWITCH. 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 release switch Brown wire terminal. See WIRING DIAGRAMS  . If test light illuminates, leave test light connected and go to next step. If test light does not illuminate, go to step  21 .
  9. Depress 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" (White 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. Following manufacturer's instructions, connect 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, probe 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  27 .
  15. 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, measure voltage at cruise control module harness connector terminal "K" (Dark Green wire) while rotating unblocked drive wheel. If voltage varies 0-5 volts, go to step  35 . If voltage is not as described, go to step  28 .
  16. Check wire(s) that 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 no problem was found, go to step  34 .
  17. Check Gray wire between cruise control module harness connector terminal "A" and cruise control functional switches harness connector terminal A12 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.
  18. Check Pink wire between cruise control module harness connector terminal "F", cruise control functional switches terminal A13 and CRUISE fuse (10-amp) located in instrument panel fuse block for open or high resistance. Repair Pink wire as necessary. After repair, check system for normal operation. 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 A14 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  34 .
  20. Check Gray/Black wire between cruise control module harness connector terminal "C" and cruise control functional switches harness connector terminal A15 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  34 .
  21. Check Brown wire between cruise control release switch harness connector terminal "A" and cruise control module harness connector terminal "D" 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  29 .
  22. Check Brown wire between cruise control release switch harness connector terminal "A" 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  29 .
  23. Check White wire between brakelight switch harness connector terminal "B" 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  30 .
  24. Check White wire between brakelight switch harness connector terminal "B" 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  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. See WIRING DIAGRAMS  . Repair Dark Green wire as necessary. After repair, check system for normal operation. 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, check system for normal operation. If wire is okay, go to step  33 .
  27. Check White 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. See WIRING DIAGRAMS  . Repair White wire as necessary. After repair, check system for normal operation. If wire is okay, go to step  33 .
  28. Check Dark Green wire between cruise control module harness connector terminal "K" and PCM harness connector C1 terminal No. 55 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  33 .
  29. Check cruise control release switch for proper adjustment. See CRUISE CONTROL RELEASE & BRAKELIGHT SWITCHES  under ADJUSTMENTS. If adjustment is okay, go to step  31 .
  30. Check brakelight switch for proper adjustment. See CRUISE CONTROL RELEASE & BRAKELIGHT SWITCHES  under ADJUSTMENTS. If adjustment is okay, go to step  32 .
  31. Check for poor connections or connector damage at cruise control release switch. Repair or replace 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 brakelight switch. Repair or replace 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 PCM harness connector. Repair or replace 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 functional switches harness connector. Repair or replace as necessary. After repair, check system for normal operation. If connections are okay, go to step  41 .
  35. Check for poor connections or connector damage at cruise control module harness connector. Repair or replace as necessary. After repair, check system for normal operation. If connections are okay, go to step  42 .
  36. Repair Pink wire as necessary 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.
  37. Repair Black wire between cruise control module harness connector terminal "E" and chassis ground. See WIRING DIAGRAMS  . After repair, check system for normal operation.
  38. Replace cruise control release switch. See CRUISE CONTROL RELEASE & BRAKELIGHT SWITCHES  under REMOVAL & INSTALLATION. After repair, check system for normal operation.
  39. Replace brakelight switch. See CRUISE CONTROL RELEASE & BRAKELIGHT SWITCHES  under REMOVAL & INSTALLATION. After repair, check system for normal operation.
  40. Replace and program PCM. See appropriate SELF-DIAGNOSTICS article in ENGINE PERFORMANCE.
  41. Replace cruise control functional switches. See CRUISE CONTROL FUNCTIONAL SWITCHES  under REMOVAL & INSTALLATION. After repair, check system for normal operation.
  42. Replace cruise control module. See CRUISE CONTROL MODULE  under REMOVAL & INSTALLATION. After repair, check system for normal operation. If system is still inoperative or malfunctions, return to step  2 .
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