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Test A: Cruise Control Inoperative/Malfunctioning

  1. If cruise control diagnostic system check has been performed, go to next step. If cruise control diagnostic system check has not been performed, perform CRUISE CONTROL DIAGNOSTIC SYSTEM CHECK  .
  2. Turn ignition switch to OFF position. Disconnect Cruise Control Module (CCM) Black 10-pin harness connector. Turn ignition switch to RUN position. Connect a test light between ground and CCM 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 CCM 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. Turn cruise control functional switch to OFF position. Using 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 at any terminal, go to next step. If test light illuminates at any terminal, go to step  16 .
  5. Turn ignition switch to RUN position. Turn cruise control functional switch to ON position. Connect test light between ground and CCM 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 test light between ground and 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  19 .
  7. Connect test light between ground and 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  20 .
  8. Connect test light between ground and CCM harness connector terminal "D" (Brown 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. 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 test light between ground and CCM 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 CCM 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. Connect scan tool to DLC. DLC is located below left side of instrument panel, to right of steering column. Command CRUISE INHIBIT/ENABLE OFF. If test light illuminates, go to next step. If test light does not illuminate, go to step  26 .
  14. Measure voltage between ground and CCM harness connector terminal "J" (White wire). If voltage is at or near battery voltage, go to next step. If voltage is not at or near battery voltage, 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. Verify speedometer operates properly. If speedometer does not operate properly, diagnose speedometer fault. See ANALOG INSTRUMENT PANELS - MONTANA, SILHOUETTE & VENTURE article. If speedometer operates properly, go to step  28 .
  16. Check wire(s) that caused test light to illuminate for short to voltage. If all wires are okay, go to step  34 . If any wire is shorted to voltage, repair appropriate wire(s) as necessary. After repair, go to step  43 .
  17. Check for open or high resistance in Gray wire between CCM harness connector terminal "A" and cruise control functional switches harness connector terminal A12. See Figure and Fig 1 . Repair Gray wire as necessary. After repair, check system for normal operation. If Gray wire is okay, go to next step.
    Fig 1: Identifying Cruise Control Switch Harness Connector Terminals
    G00062295Courtesy of GENERAL MOTORS CORP.
  18. Check for open or high resistance in Pink wire between CCM harness connector terminal "F", cruise control functional switches terminal A13 and CRUISE fuse (10-amp) located in instrument panel fuse block. If Pink wire is okay, go to step  34 . If Pink wire is not okay, repair as necessary. After repair, go to step  43 .
  19. Check for open or high resistance in Dark Blue wire between CCM harness connector terminal "B" and cruise control functional switches harness connector terminal A14. See Figure and Fig 1 . If Dark Blue wire is okay, go to step  34 . If Dark Blue wire is not okay, repair wire as necessary. After repair, go to step  43 .
  20. Check for open or high resistance in Gray/Black wire between CCM harness connector terminal "C" and cruise control functional switches harness connector terminal A15. See Figure and Fig 1 . If Gray/Black wire is okay, go to step  35 . If Gray/Black wire is not okay, repair as necessary. After repair, go to step  43 .
  21. Check for open or high resistance Brown wire between cruise control release switch harness connector terminal "A" and cruise control module harness connector terminal "D". See Figure and Fig 1 . If Brown wire is okay, go to step  29 . If Brown wire is not okay, repair as necessary. After repair, go to step  43 .
  22. Check for short to voltage in Brown wire between cruise control release switch harness connector terminal "A" and cruise control module harness connector terminal "D". See Figure and Fig 1 . If Brown wire is okay, go to step  29 . If Brown wire is not okay, repair as necessary. After repair, go to step  43 .
  23. Check for short to voltage in White wire between brakelight switch harness connector terminal "B" and CCM harness connector terminal "G". See Figure and Fig 1 . If White wire is okay, go to step  30 . If White wire is not okay, repair as necessary. After repair, go to step  43 .
  24. Check for open or high resistance in White wire between brakelight switch harness connector terminal "B" and CCM harness connector terminal "G". See Figure and Fig 1 . If White wire is okay, go to step  30 . If White wire is not okay, repair as necessary. After repair, go to step  43 .
  25. Check for short to ground in Dark Green wire between CCM harness connector terminal "H" and PCM harness connector C1 terminal No. 72. See Figure and Figure . If Dark Green wire is okay, go to step  33 . If Dark Green wire is not okay, repair as necessary. After repair, go to step  43 .
  26. Check for open, high resistance or short to voltage Dark Green wire between CCM harness connector terminal "H" and PCM harness connector C1 terminal No. 72. See Figure and Figure . If Dark Green wire is okay, go to step  33 . If Dark Green wire is not okay, repair as necessary. After repair, go to step  43 .
  27. Check for open, high resistance or short to voltage in White wire between CCM harness connector terminal "J" and PCM harness connector C2 terminal No. 59. See Figure and Figure . If White wire is okay, go to step  33 . If White wire is not okay, repair as necessary. After repair, go to step  43 .
  28. Check for open or high resistance in Dark Green wire between CCM harness connector terminal "K" and PCM harness connector C1 terminal No. 55. See Figure and Figure . If wire is okay, go to step  33 . If Dark Green wire is not okay, repair as necessary. After repair, go to step  43 .
  29. Check cruise control release switch for proper adjustment. See CRUISE CONTROL RELEASE & BRAKELIGHT SWITCHES  under ADJUSTMENTS. Adjust as necessary. After repair, go to step  43 . If adjustment is okay, go to step  31 .
  30. Check brakelight switch for proper adjustment. See CRUISE CONTROL RELEASE & BRAKELIGHT SWITCHES  under ADJUSTMENTS. Adjust as necessary. After repair, go to step  43 . If adjustment is okay, go to step  32 .
  31. Check cruise control release switch harness connector for poor terminal contact or damage. Repair or replace as necessary. After repair, go to step  43 . If terminal contact is okay, go to step  38 .
  32. Check brakelight switch harness connector for poor terminal contact or damage. Repair or replace as necessary. After repair, go to step  43 . If terminal contact is okay, go to step  39 .
  33. Check PCM harness connector for poor terminal contact or damage. Repair or replace as necessary. After repair, go to step  43 . If terminal contact is okay, go to step  40
  34. Check cruise control functional switches harness connector for poor terminal contact or damage. Repair or replace as necessary. After repair, go to step  43 . If terminal contact is okay, go to step  41 .
  35. Check CCM harness connector for poor terminal contact or damage. Repair or replace as necessary. After repair, go to step  43 . If terminal contact is okay, go to step  42 .
  36. Repair Pink wire as necessary between CCM harness connector terminal "F" and CRUISE fuse (10-amp) in instrument panel fuse block. After repair, go to step  43 .
  37. Repair Black wire between CCM harness connector terminal "E" and chassis ground. Ground point G202 is located behind left side of dash, on underside of cross car beam. See Figure . After repair, go to step  43 .
  38. Replace cruise control release switch. See CRUISE CONTROL RELEASE & BRAKELIGHT SWITCHES  under REMOVAL & INSTALLATION. After repair, go to step  43 .
  39. Replace brakelight switch. See CRUISE CONTROL RELEASE & BRAKELIGHT SWITCHES  under REMOVAL & INSTALLATION. After repair, go to step  43 .
  40. Replace PCM. See POWERTRAIN CONTROL MODULE  under REMOVAL & INSTALLATION. Program PCM as necessary. See PROGRAMMING in BODY CONTROL MODULES - MONTANA, SILHOUETTE & VENTURE article. 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 CCM. See CRUISE CONTROL MODULE  under REMOVAL & INSTALLATION. After repair, go to next step .
  43. Operate vehicle to verify fault(s) no longer exist. If cruise control system does not operate properly, go to step  2 .
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