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Test B: Cruise Control Inoperative/Malfunctioning (Without Electronic Throttle Control): Testing

  1. If diagnostic system check has been performed, go to next step. If diagnostic system check has not been performed, perform CRUISE CONTROL DIAGNOSTIC SYSTEM CHECK  under SELF-DIAGNOSTIC SYSTEM.
  2. Turn ignition switch to OFF position. Disconnect cruise control module 10-pin harness connector. Cruise control module is located on left front frame rail, behind bumper. Turn ignition switch to RUN position. Connect a test light between ground and cruise control harness connector terminal "F" (Pink wire). See Figure. If test light illuminates, go to next step. If test light does not illuminate, go to step  36.
  3. Connect test light between cruise control module harness connector terminals "E" (Black wire) and "F" (Pink wire). If test light illuminates, go to next step. If test light does not illuminate, go to step  37.
  4. Ensure cruise control switch is in OFF position. Connect a test light between ground and cruise control module harness connector terminals "A" (Gray wire), "B" (Dark Blue wire) and "C" (Gray/Black wire). See Figure. If test light does not illuminate at all terminals, go to next step. If test light illuminates at any terminal, go to step  16.
  5. Turn cruise control switch to ON position. Connect a test light between ground and 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. Connect a test light between ground and cruise control module harness connector terminal "B" (Dark Blue wire). Press and hold SET (Set/Coast) button. If test light illuminates, go to next step. If test light does not illuminate, go to step  19.
  7. Connect a test light between ground and cruise control module harness connector terminal "C" (Gray/Black wire). Press and hold R/A (Resume/Accelerate) button. If test light illuminates, go to next step. If test light does not illuminate, go to step  20.
  8. Connect a test light between ground and cruise control module harness connector terminal "D" (Brown wire). See Figure. If test light illuminates, 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. Connect a test light between ground and cruise control module harness connector terminal "G" (Light Blue wire). If test light does not illuminate, 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. Connect a test light between battery positive and cruise control module harness connector terminal "H" (Dark Green wire). See Figure. If test light does not illuminate, go to next step. If test light illuminates, go to step  25.
  13. Using scan tool, command cruise inhibit OFF. If test light illuminates, go to next step. If test light does not illuminate, go to step  26.
  14. Using a DVOM, measure voltage between ground and cruise control module harness connector terminal "J" (White wire). See Figure. If voltage exists, go to next step. If voltage does not exist, go to step  27.
  15. Test drive vehicle, and verify speedometer operation. If speedometer operates correctly, go to step  28. If speedometer does not operate correctly, repair speedometer as necessary. See ANALOG INSTRUMENT PANELS - CAMARO & FIREBIRD article.
  16. Inspect for a short to voltage between multifunction switch harness connector terminals "J" (Gray/Black wire), "K" (Dark Blue wire) and "L" (Gray wire) and cruise control module terminals "A" (Gray wire), "B" (Dark Blue wire), and "C" (Gray/Black wire). See Figure. If a short to voltage is not found at any terminal, go to step  34. If a short to voltage is found at any terminal, repair suspect circuit as necessary. After repair, go to step  43.
  17. Inspect Gray wire for an open or high resistance between cruise control module harness connector terminal "A" and multifunction lever switch harness connector terminal "L". See Figure and Figure . If an open or high resistance is not found, go to next step. If an open or high resistance is found, repair Gray wire as necessary. After repair, go to step  43.
  18. Inspect Pink wire for an open or high resistance between cruise control switch harness connector terminal "M" and cruise control module harness connector terminal "F". If an open or high resistance is not found, go to step  34. If an open or high resistance is found, repair Pink wire as necessary. After repair, go to step  43.
  19. Inspect Dark Blue wire for an open or high resistance between multifunction switch harness connector terminal "K" and cruise control module harness connector terminal "B". See Figure. If an open or high resistance is not found, go to step  34. If an open or high resistance is found, repair Dark Blue wire as necessary. After repair, go to step  43.
  20. Inspect Gray/Black wire for an open or high resistance between multifunction switch harness connector terminal "J" and cruise control module harness connector terminal "C". See Figure. If an open or high resistance is not found, go to step  34. If an open or high resistance is found, repair Gray/Black wire as necessary. After repair, go to step  43.
  21. Inspect Brown wire for an open or high resistance between cruise control release switch harness connector terminal "A" and cruise control module harness connector terminal "D". See Figure. If an open or high resistance is not found, go to step  29. If an open or high resistance is found, repair Brown wire as necessary. After repair, go to step  43.
  22. Inspect Brown wire for a short to voltage between cruise control release switch harness connector terminal "A" and cruise control module harness connector terminal "D". See Figure. If a short to voltage is not found, go to step  29. If a short to voltage is found, repair Brown wire as necessary. After repair, go to step  43.
  23. Inspect Light Blue wire for a short to voltage between stoplight switch harness connector terminal "B" and cruise control module harness connector terminal "G". See Figure. If a short to voltage is not found, go to step  30. If a short to voltage is found, repair Light Blue wire as necessary. After repair, go to step  43.
  24. Inspect Light Blue wire for an open or high resistance between stoplight switch harness connector terminal "B" and cruise control module harness connector terminal "G". See Figure. If an open or high resistance is not found, go to step  30. If an open or high resistance is found, repair Light Blue wire as necessary. After repair, go to step  43.
  25. Inspect Dark Green wire for a short to ground between Powertrain Control Module (PCM) harness connector C2 terminal No. 37 and cruise control module harness connector terminal "H". See Figure. If a short to ground is not found, go to step  33. If a short to ground is found, repair Dark Green wire as necessary. After repair, go to step  43.
  26. Inspect Dark Green wire for an open, high resistance or short to voltage between PCM harness connector C2 terminal No. 37 and cruise control module harness connector terminal "H". See Figure. If an open, high resistance or short to voltage is not found, go to step  33. If an open, high resistance or short to voltage is found, repair Dark Green wire as necessary. After repair, go to step  43.
  27. Inspect White wire for an open, high resistance or short to voltage between PCM harness connector C2 terminal No. 13 and cruise control module harness connector terminal "J". See Figure. If an open, high resistance or short to voltage is not found, go to step  33. If an open, high resistance or short to voltage is found, repair White wire as necessary. After repair, go to step  43.
  28. Inspect Dark Green/White wire for an open or high resistance between PCM harness connector terminal No. 50 and cruise control module harness connector terminal "K". See Figure and Figure . If an open or high resistance is not found, go to step  35. If an open or high resistance is found, repair Dark Green/White wire as necessary. After repair, go to step  43.
  29. Inspect cruise control release switch for proper adjustment. If adjustment is not necessary, go to step  31. If adjustment is necessary, see CRUISE CONTROL RELEASE SWITCH, STOPLIGHT SWITCH & TORQUE CONVERTER CLUTCH/BRAKE SWITCH  under ADJUSTMENTS. After repair, go to step  43.
  30. Inspect stoplight switch for proper adjustment. If adjustment is not necessary, go to step  32. If adjustment is necessary, see CRUISE CONTROL RELEASE SWITCH, STOPLIGHT SWITCH & TORQUE CONVERTER CLUTCH/BRAKE SWITCH  under ADJUSTMENTS. After repair, go to step  43.
  31. Inspect cruise control release switch harness connector for poor connections. If poor connections are not found, go to step  38. If poor connections are found, repair cruise control release switch harness connector as necessary. After repair, go to step  43.
  32. Inspect stoplight switch harness connector for poor connections. If poor connections are not found, go to step  39. If poor connections are found, repair stoplight switch harness connector as necessary. After repair, go to step  43.
  33. Inspect PCM harness connector for poor connections. If poor connections are not found, go to step  40. If poor connections are found, repair PCM harness connector as necessary. After repair, go to step  43.
  34. Inspect multifunction lever switch harness connector for poor connections. If poor connections are not found, go to step  41. If poor connections are found, repair multifunction switch harness connector as necessary. After repair, go to step  43.
  35. Inspect cruise control module harness connector for poor connections. If poor connections are not found, go to step  42. If poor connections are found, repair cruise control module as necessary. After repair, go to step  43.
  36. Repair open in Pink wire between cruise control module and bottom underhood fuse block. After repair, go to step  43.
  37. Repair open in Black wire between cruise control module and ground. Ground point is located at left front frame rail. After repair, go to step  43.
  38. Replace cruise control release switch. After repair, go to step  43.
  39. Replace stoplight switch. After repair, go to step  43.
  40. Replace PCM. Program PCM. See POWERTRAIN CONTROL MODULE  under PROGRAMMING. After repair, go to step  43.
  41. Replace multifunction lever switch. After repair, go to step  43.
  42. Replace cruise control module, then go to next step.
  43. Operate system to verify repair. If cruise control system is not operating properly, repeat test beginning at step  2.
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