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Test C: Cruise Control Inoperative/Malfunctioning

  1. Perform cruise control system check and go to next step. See SYSTEM CHECK  under TROUBLESHOOTING.
  2. Turn ignition off. Disconnect cruise control module harness connector. Turn ignition on. Connect test light between ground and 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  34 .
  3. Connect test light ground to cruise control module harness connector terminal "E" (Black/White wire) and probe 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 .
  4. Turn cruise control off. Connect a test light to ground and 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 on any circuits, go to next step. If test light illuminates on any circuits, go to step  16 .
  5. Turn cruise control on. Connect a test light to ground and probe cruise control module harness connector terminal "A"(Gray wire). See WIRING DIAGRAMS  . If test light illuminates, go to next step. If test light does not illuminate, go to step  17 .
  6. Connect test light to ground and probe cruise control module harness connector terminal "B" (Dark Blue wire). Depress and hold SET/COAST switch. See WIRING DIAGRAMS  . If test light illuminates, go to next step. If test light does not illuminate, go to step  19 .
  7. Connect test light to ground and probe cruise control module harness connector terminal "C" (Gray/Black wire). Depress and hold RESUME/ACCEL switch. See WIRING DIAGRAMS  . If test light illuminates, go to next step. If test light does not illuminate, go to step  20 .
  8. Connect test light to ground and probe cruise control module harness connector terminal "D" (Purple wire). If test light illuminates, go to next step. See WIRING DIAGRAMS  . If test light does not illuminate, go to step  21 .
  9. With test light still connected to cruise control module harness connector terminal "D", depress brake pedal. If test light does not illuminate, go to next step. If test light illuminates, go to step  24 .
  10. Connect test light to ground and probe cruise control module harness connector terminal "G" (Light Blue wire). If test light does not illuminate, go to next step. See WIRING DIAGRAMS  . If test light illuminates, go to step  22 .
  11. With test light still connected to cruise control module harness connector terminal "G" (Light Blue wire), depress brake pedal. See WIRING DIAGRAMS  . If test light illuminates, go to next step. If test light does not illuminate, go to step  26 .
  12. Connect test light to battery power and 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  27 .
  13. With test light still connected to cruise control module harness connector terminal "H" (Dark Green wire), command CRUISE INHIBIT OFF. See WIRING DIAGRAMS  . If test light illuminates, go to next step. If test light does not illuminate, go to step  28 .
  14. Measure voltage between ground and cruise control module harness connector terminal "J" (White wire). See WIRING DIAGRAMS  . If battery voltage exists, go to next step. If battery voltage does not exist, go to step  29 .
  15. Check speedometer for proper operation. If speedometer operates correctly, go to step  30 . If speedometer does not operate correctly, See INSTRUMENT PANEL CLUSTER under REMOVAL & REPLACEMENT in ANALOG INSTRUMENT PANELS - PARK AVENUE article.
  16. Check the circuit which illuminated the test light for a short to voltage. If problem was not found, go to step  34 . If problem was found and corrected, go to step  43 .
  17. Check for an open or high resistance in Gray wire between cruise control module harness connector terminal "A" and cruise control (multifunction) switch harness connector terminal B9. See WIRING DIAGRAMS  . If problem was not found, go to next step. If problem was found and corrected, go to step  43 .
  18. Check for an open or high resistance in Brown wire between cruise control (multifunction) switch harness connector terminal B6 and CR CONT fuse (10-amp) located in instrument panel junction block behind glove box. See WIRING DIAGRAMS  . If problem was not found, go to step  34 . If problem was found and corrected, go to step  43 .
  19. Check for an open or high resistance in Dark Blue wire between cruise control harness connector terminal "B" and cruise control (multifunction) switch harness connector terminal B8. See WIRING DIAGRAMS  . If problem was not found, go to step  34 . If problem was found and corrected, go to step  43 .
  20. Check for an open or high resistance in Gray/Black wire between cruise control module harness connector terminal "C" and cruise control (multifunction) switch harness connector terminal B7. See WIRING DIAGRAMS  . If problem was not found, go to step  34 . If problem was found and corrected, go to step  43 .
  21. Check adjustment of brake light switch. See CRUISE CONTROL RELEASE SWITCH & BRAKELIGHT SWITCH  under REMOVAL & INSTALLATION. If problem was not found, go to step  23 . If problem was found and corrected, go to step  43 .
  22. Check adjustment of cruise control release switch. See CRUISE CONTROL RELEASE SWITCH & BRAKELIGHT SWITCH  under REMOVAL & INSTALLATION. If problem was not found, go to step  25 . If problem was found and corrected, go to step  43 .
  23. Check for an open or high resistance in Purple wire between cruise control module harness connector terminal "D" and cruise control release switch harness connector terminal "B". See WIRING DIAGRAMS  . If problem was not found, go to step  31 . If problem was found and corrected, go to step  43 .
  24. Check for a short to voltage in Purple wire between cruise control module harness connector terminal "D" and cruise control release switch harness connector terminal "B". See WIRING DIAGRAMS  . If problem was not found, go to step  31 . If problem was found and corrected, go to step  43 .
  25. Check for a short to voltage in Light Blue wire between cruise control module harness connector terminal "G" and stoplight switch harness connector terminal "B". See WIRING DIAGRAMS  . If problem was not found, go to step  32 . If problem was found and corrected, go to step  43 .
  26. Check for an open or high resistance in Light Blue wire between cruise control module harness connector terminal "G" and stoplight switch harness connector terminal "B". See WIRING DIAGRAMS  . If problem was not found, go to step  32 . If problem was found and corrected, go to step  43 .
  27. Check for a short to ground in Dark Green wire between cruise control module harness connector terminal "H" and PCM harness connector terminal No. 72. See WIRING DIAGRAMS  . If problem was not found, go to step  33 . If problem was found and corrected, go to step  43 .
  28. Check for an open, high resistance or short to voltage in Dark Green wire between cruise control harness connector terminal "H" and PCM harness connector terminal No. 72. See WIRING DIAGRAMS  . If problem was not found, go to step  33 . If problem was found and corrected, go to step  43 .
  29. Check for an open, high resistance or short to voltage in White wire between cruise control harness connector terminal "J" and PCM harness connector terminal No. 59. See WIRING DIAGRAMS  . If problem was not found, go to step  33 . If problem was found and corrected, go to step  43 .
  30. Check for an open or high resistance in Dark Green/White wire between cruise control module harness connector terminal "K" and PCM harness connector terminal No. 55. See WIRING DIAGRAMS  . If problem was not found, go to step  35 . If problem was found and corrected, go to step  43 .
  31. Check for loose wires and poor connections at cruise control release switch harness connector. If problem was not found, go to step 38 . If a problem was found and corrected, go to step  43 .
  32. Check for loose wires and poor connections at stoplight switch harness connector. If problem was not found, go to step 39 . If a problem was found and corrected, go to step  43 .
  33. Check for loose wires and poor connections at PCM harness connectors. If problem was not found, go to step  40 . If a problem was found and corrected, go to step  43 .
  34. Check for loose wires and poor connections at cruise control (multifunction) switch. If problem was not found, go to step  41 . If a problem was found and corrected, go to step  43 .
  35. Check for loose wires and poor connections at cruise control module harness connector. If problem was not found, go to step  42 . If a problem was found and corrected, go to step  43 .
  36. Repair Brown wire between cruise control module harness connector terminal "F" and CR CONT fuse (10-amp) located in instrument panel fuse block behind glove box. See WIRING DIAGRAMS  . Go to step  43
  37. Repair open or high resistance in Black/White wire between cruise control harness connector terminal "E" and ground located at right rear of engine or on engine below power steering pump. See WIRING DIAGRAMS  . Go to step  43
  38. Replace cruise control release switch. See BRAKE LIGHT SWITCH under REMOVAL & INSTALLATION in appropriate BRAKE SYSTEM article. Go to step  43 .
  39. Replace stoplight switch. See BRAKE LIGHT SWITCH under REMOVAL & INSTALLATION in appropriate BRAKE SYSTEM article. Go to step  43 .
  40. Replace and reprogram PCM. See appropriate SELF-DIAGNOSTICS article in ENGINE PERFORMANCE. Go to step  43 .
  41. Replace multifunction turn signal lever. See CRUISE CONTROL (MULTIFUNCTION) SWITCH  under REMOVAL & INSTALLATION and go to step  43 .
  42. Replace cruise control module. See CRUISE CONTROL MODULE  under REMOVAL & INSTALLATION. Go to next step.
  43. Operate cruise control system. If cruise control system is operating correctly, system is okay at this time. If cruise control system is not operating correctly, return to step  2 .
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