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Test C: Cruise Control Inoperative/Malfunctioning

WARNING: This page is about a different car, the 2002 Pontiac Grand Am and 2002 Oldsmobile Alero. However, it is still accessible from the selected car via links, so may be relevant.
NOTE: To avoid misdiagnosis, ensure preliminary inspection and all checks have been performed. See PRELIMINARY INSPECTION  under TROUBLE SHOOTING.

Before performing test procedure, inspect for proper operation of brakelights. Inspect throttle linkage for mechanical binding. Inspect cruise control cable adjustment. Ensure SIR coil integrity on vehicles equipped with steering wheel controls by rotating steering wheel to each stop position while testing cruise control switch signal circuits. EMI on speed sensor signal circuit may cause erratic cruise control operation.

  1. If cruise control diagnostic system check has been performed, go to next step. If cruise control diagnostic system check has not been performed, go to CRUISE CONTROL DIAGNOSTIC SYSTEM CHECK  under SELF-DIAGNOSTIC SYSTEM. After completing system check, go to next step.
  2. Turn ignition switch to OFF position. Disconnect Cruise Control Module (CCM) 10-pin harness connector. CCM is located at passenger side front corner of engine compartment. See Figure . Turn ignition switch to RUN position. Using a test light connected to ground, probe CCM harness connector terminal "F" (Brown wire). See Figure . If test light illuminates, go to next step. If test light does not illuminate, go to step  40 .
  3. Connect a test light between CCM harness connector terminals "E" (Black wire) and "F" (Brown wire). If test light illuminates, go to next step. If test light does not illuminate, go to step  41 .
  4. Turn ignition switch to RUN position. Ensure cruise control switch is in OFF position. Using a test light connected to ground, probe CCM 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 terminal, go to step  18 .
  5. Turn cruise control switch to ON position. Using a test light connected to ground, probe CCM harness connector terminal "A" (Gray wire). If test light illuminates, go to next step. If test light does not illuminate, go to step  19 .
  6. Using a test light connected to ground, probe CCM harness connector terminal "B" (Dark Blue wire). Press and hold SET/COAST switch. If test light illuminates, go to next step. If test light does not illuminate, go to step  21 .
  7. Using a test light connected to ground, probe CCM 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  22 .
  8. Using a test light connected to ground, probe CCM 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  23 .
  9. While monitoring test light at terminal "D" (Purple wire), depress brake pedal. If test light does not illuminate, go to next step. If test light illuminates, go to step  24 .
  10. Using a test light connected to ground, probe CCM harness connector terminal "G" (Light Blue wire). If test light does not illuminate, leave test light connected to terminal "G" and go to next step. If test light illuminates, go to step  25 .
  11. While monitoring test light, depress brake pedal. If test light illuminates, go to next step. If test light does not illuminate, go to step  26 .
  12. Using a test light connected to battery voltage, probe CCM harness connector terminal "H" (Dark Green wire). If test light does not illuminate, go to next step. If test light illuminates, go to step  29 .
  13. Turn ignition to OFF. Connect CCM and disconnect PCM. Measure voltage between ground and CCM harness connector terminal "H" (Dark Green wire). If battery voltage exists, go to next step. If battery voltage does not exist, go to step  30 .
  14. Turn ignition OFF and connect PCM. Turn ignition to RUN and measure voltage between ground and CCM 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  31 .
  15. Turn ignition switch to OFF position. Disconnect Body Control Module (BCM) Gray 24-pin harness connector C2. BCM is located under passenger side of instrument panel. See Figure . Turn ignition switch to RUN position. Using a test light connected to ground, probe BCM harness connector C2 terminal A8 (Light Green wire). See Figure . If test light illuminates, leave test light connected and go to next step. If test light does not illuminate, go to step  27 .
  16. Monitor test light while pressing cruise control cancel switch. If test light does not illuminate, go to next step. If test light illuminates, go to step  28 .
  17. Test drive vehicle. If speedometer operates normally, go to step  32 . If speedometer does not operate normally, repair speedometer. See ANALOG INSTRUMENT PANELS - ALERO & GRAND AM article.
  18. Repair short to voltage in wire that lit test light. See WIRING DIAGRAMS  . After repair, go to step  47 . If no problem was found or condition still exists, go to step  38 .
  19. Check for open or high resistance in Gray wire between cruise control functional switch harness connector terminal "D" and CCM harness connector terminal "A". Check for short to ground in Gray/Black wire between cruise control functional switches terminal "C" and CCM harness connector terminal "C". Check for short to ground in Dark Blue wire between cruise control functional switches terminal "B" and CCM harness connector terminal "B". See Figure . See WIRING DIAGRAMS  . If no problem was found, go to next step. If problem is found, repair as necessary and go to step  47 .
  20. Check for open or high resistance in Brown wire between cruise control functional switches harness connector terminal "A" and passenger side instrument panel junction block harness connector C1 terminal B6. See Figure . If problem is found, repair as necessary and go to step  47 . If no problem was found or condition still exists, go to step  38 .
  21. Check for open or high resistance in Dark Blue wire between cruise control functional switches harness connector terminal "B" and CCM harness connector terminal "B". If problem is found, repair as necessary and go to step  47 . If no problem was found or condition still exists, go to step  38 .
  22. Check for open or high resistance in Gray/Black wire between cruise control functional switches harness connector terminal "C" and CCM harness connector terminal "C". If problem is found, repair as necessary and go to step  47 . If no problem was found or condition still exists, go to step  38 .
  23. Check for open or high resistance in circuit 420 (Purple wire) between TCC/Brake switch harness connector "B" and CCM harness connector terminal "D". See Figure and Figure . If problem is found, repair as necessary and go to step  47 . If no problem was found or condition still exists, go to step  33 .
  24. Check for short to voltage in circuit 420 (Purple wire) between TCC/Brake switch harness connector "B" and CCM harness connector terminal "D". See Figure . If problem is found, repair as necessary and go to step  47 . If no problem was found or condition still exists, go to step  33 .
  25. Check for short to voltage in Light Blue wire between brakelight switch and CCM harness connector terminal "G". See Figure . If problem is found, repair as necessary and go to step  47 . If no problem was found or condition still exists, go to step  34 .
  26. Check for open or high resistance in Light Blue wire between brakelight switch and CCM harness connector terminal "G". See Figure . If problem is found, repair as necessary and go to step  47 . If no problem was found or condition still exists, go to step  34 .
  27. Check for open or high resistance in Light Green wire between cruise control switch harness connector terminal "H" and BCM harness connector C2 terminal A8. See Figure . If problem is found, repair as necessary and go to step  47 . If no problem was found or condition still exists, go to step  38 .
  28. Check for short to voltage in Light Green wire between cruise control switch harness connector terminal "H" and BCM harness connector C2 terminal A8. See Figure . If problem is found, repair as necessary and go to step  47 . If no problem was found or condition still exists, go to step  38 .
  29. Check for short to ground in Dark Green wire between CCM harness connector terminal "H" and PCM harness connector C1 terminal 49 (2.2L) or 72 (3.4L). See CONNECTOR IDENTIFICATION  and WIRING DIAGRAMS  . If problem is found, repair as necessary and go to step  47 . If no problem was found or condition still exists, go to step  37 .
  30. Check for open or high resistance in Dark Green wire between CCM harness connector terminal "H" and PCM harness connector C1 terminal 49 (2.2L) or 72 (3.4L). See CONNECTOR IDENTIFICATION  and WIRING DIAGRAMS  . If problem is found, repair as necessary and go to step  47 . If no problem was found or condition still exists, go to step  37 .
  31. Check for open, high resistance or short to voltage in Light/Blue Black wire between CCM harness connector terminal "J" and PCM harness connector C2 terminal 53 (2.2L) or 59 (3.4L). See CONNECTOR IDENTIFICATION  and WIRING DIAGRAMS  . If problem is found, repair as necessary and go to step  47 . If no problem was found or condition still exists, go to step  37 .
  32. Check for open or high resistance in Dark/Green White wire between CCM harness connector terminal "K" and PCM harness connector C1 terminal 34 (2.2L) or terminal 55 (3.4L). If problem is found, repair as necessary and go to step  47 . If no problem was found or condition still exists, go to step  39 .
  33. Check TCC/Brake switch adjustment. See CRUISE RELEASE SWITCH ADJUSTMENT  under ADJUSTMENTS. Adjust TCC/Brake switch if necessary. After adjustment, go to step  47 . If adjustment is okay or condition still exists, go to step  35 .
  34. Check brakelight switch for proper adjustment. See CRUISE RELEASE SWITCH ADJUSTMENT  under ADJUSTMENTS. Adjust brakelight switch if necessary, after adjustment go to step  47 . If adjustment is okay or condition still exists, go to step  36 .
  35. Check for poor, loose or corroded terminals at TCC/Brake switch. If problem is found, repair as necessary and go to step  47 . If no problem was found or condition still exists, go to step  42 .
  36. Check for poor, loose or corroded terminals at brakelight switch. If problem is found, repair as necessary and go to step  47 . If no problem was found or condition still exists, go to step  43 .
  37. Check for poor, loose or corroded terminals at PCM harness connectors. If problem is found, repair as necessary and go to step  47 . If no problem was found or condition still exists, go to step  44 .
  38. Inspect for poor, loose, corroded connections, or damaged wiring at cruise control switch harness connector. If problem is found, repair as necessary and go to step  47 . If no problem was found or condition still exists, go to step  45 .
  39. Check for poor, loose, corroded terminals, or connector damage at CCM. If problem is found, repair as necessary and go to step  47 . If no problem was found or condition still exists, go to step  46
  40. Repair open or short in Brown wire between passenger side instrument panel junction block CRUISE fuse (10-amp) and CCM harness connector terminal "F". See CONNECTOR IDENTIFICATION  and WIRING DIAGRAMS  . After repair are made, go to step  47 .
  41. Repair open in Black wire between ground and CCM harness connector terminal "E". See CONNECTOR IDENTIFICATION  and WIRING DIAGRAMS  . Ground point is located on driver side of engine compartment, near strut tower. After repairs are made, go to step  47 .
  42. Replace TCC/Brake switch. See TCC/BRAKELIGHT RELEASE SWITCH & CLUTCH RELEASE SWITCH  under REMOVAL & INSTALLATION. Adjust TCC/Brake switch. See CRUISE RELEASE SWITCH ADJUSTMENT  under ADJUSTMENTS. After repairs are made, go to step  47 .
  43. Replace brakelight switch. See TCC/BRAKELIGHT RELEASE SWITCH & CLUTCH RELEASE SWITCH  under REMOVAL & INSTALLATION. Adjust brakelight switch. See CRUISE RELEASE SWITCH ADJUSTMENT  under ADJUSTMENTS. After repairs are made, go to step  47 .
  44. Replace PCM. See POWERTRAIN CONTROL MODULE under REMOVAL & INSTALLATION in BODY CONTROL MODULES - ALERO & GRAND AM article. After repairs are made, go to step  47 .
  45. Replace cruise control functional switches. See CRUISE CONTROL FUNCTIONAL SWITCHES  under REMOVAL & INSTALLATION. After repairs are made, go to step  47 .
  46. Replace CCM. See CRUISE CONTROL MODULE  under REMOVAL & INSTALLATION. After repairs are made, go to next step.
  47. Road test vehicle at speeds greater than 25 MPH and fully exercise cruise control system. If cruise control system operates normally, system is okay. If system is inoperative or malfunctions, return to step  2 .
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