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Cruise Control Inoperative/Malfunctioning (Using Tester J42958): Notes

NOTE: The following test is specially designed for GM Cruise Control Tester (J42958). GM has noted that using this tester on vehicles with high resistance or an open in cruise control module ground circuit causes the LED(s) on the tester to light abnormally. If this situation is experienced, confirm ground circuit integrity before continuing the test.
  1. Perform cruise control diagnostic system check. See DIAGNOSTIC SYSTEM CHECK  under SELF-DIAGNOSTIC SYSTEM. After completing diagnostic system check, go to next step.
  2. Turn ignition switch to OFF position. Connect Cruise Control Tester (J42958) between cruise control module and cruise control module harness connector. Turn cruise control switch to OFF position. Turn ignition switch to ON position. If IGNITION LED illuminates, go to next step. If IGNITION LED does not illuminate, go to step  20 .
  3. If BRAKE/TCC LED is illuminated, go to next step. If BRAKE/TCC LED is not illuminated, go to step  22 .
  4. If BRAKE LIGHTS LED is not illuminated, go to next step. If BRAKE LIGHTS LED is illuminated, go to step  23 .
  5. Press and release brake pedal. If BRAKE/TCC LED turned off when brake pedal was depressed, go to next step. If BRAKE/TCC LED remained on, go to step  25 .
  6. Turn cruise control switch to ON position. If ON/OFF and INHIBIT/ENABLE LEDs illuminate, go to next step. If ON/OFF and INHIBIT/ENABLE LEDs do not illuminate, go to step  27 .
  7. If CRUISE LAMP LED illuminates, go to next step. If CRUISE LAMP LED does not illuminate, go to step  28 .
  8. Press and release SET/COAST switch. If SET/COAST LED illuminates when switch is pressed and turns off when switch is released, go to next step. If SET/COAST LED does not function as described, go to step  31 .
  9. Press and release RESUME/ACCEL switch. If RESUME/ACCEL LED illuminates when switch is pressed and turns off when switch is released, go to next step. If RESUME/ACCEL LED does not function as described, go to step  32 .
  10. Perform the following operations in sequence:
    • Press and release INHIBIT OVERRIDE button on cruise control tester.
    • Press and release BRAKE button on cruise control tester.
    • Press and release SET/COAST button on cruise control tester.
    If CRUISE ENGAGE LED illuminates continuously after SET/COAST button was pressed and released, go to next step. If CRUISE ENGAGE LED does not illuminate as described, go to step  20 .
  11. While observing throttle lever at throttle body, press and hold RESUME/ACCEL button on cruise control tester for 5 seconds, then release. If throttle lever moves toward wide open throttle then closes to about one-half throttle, go to next step. If throttle lever did not operate as described, go to step  36 .
  12. While observing throttle lever at throttle body, press and hold SET/COAST button on cruise control tester for 5 seconds, then release. If throttle lever moves toward closed throttle then returns to about one-half throttle, go to next step. If throttle lever did not operate as described, go to step  36 .
  13. Press and release (tap) RESUME/ACCEL button on cruise control tester 3 times. Press and release BRAKE button on cruise control tester. If CRUISE ENGAGE LED turns off and throttle lever returns to closed position, go to next step. If CRUISE ENGAGE LED and throttle lever do not operate as described, go to step  36 .
  14. Raise and support vehicle. Block one drive wheel and place transaxle in DRIVE position. Turn ignition switch to ON position. If VSS LED flashes while rotating drive wheel, go to next step. If VSS LED does not flash while rotating drive wheel, go to step  29 .
  15. Check cruise control module harness connector. If Dark Green wire is attached to terminal "H", go to next step. If there is no wire attached to terminal "H", go to step  19 .
  16. Connect scan tool to DLC. Turn ignition switch to ON position. Select POWERTRAIN SPECIAL FUNCTIONS and then OUTPUT CONTROLS for CRUISE INHIBIT on scan tool. Observe INHIBIT ENABLE LED while using scan tool to enable cruise control. If INHIBIT ENABLE LED dimmed during enable command, go to next step. If INHIBIT ENABLE LED did not dim during enable command, go to step  33 .
  17. Turn ignition switch to OFF position. Disconnect cruise control tester and reconnect wiring harness to cruise control module. Road test vehicle at speeds greater than 25 MPH and exercise cruise control system. Using scan tool, monitor cruise inhibit status. If scan tool displays ENABLED at speeds above 25 MPH, go to next step. If scan tool does not display ENABLED at speeds above 25 MPH, see appropriate SELF-DIAGNOSTICS article in ENGINE PERFORMANCE.
  18. If cruise control system operated normally, problem is intermittent. See PRELIMINARY INSPECTION  under TROUBLE SHOOTING. If cruise control system did not operate normally, go to step  36 .
  19. Reconnect all components. Road test vehicle at speeds greater than 25 MPH and exercise cruise control system. If cruise control system operated normally, problem is intermittent. See PRELIMINARY INSPECTION  under TROUBLE SHOOTING. If cruise control system does not operate normally, go to step  36 .
  20. Check Brown wire (Pink wire on Grand Prix) between cruise control module harness connector terminal "F" and ignition feed circuit in right instrument panel fuse block for open, high resistance or short to ground. See WIRING DIAGRAMS  . Repair Brown wire (Pink wire on Grand Prix) as necessary. After repair, go to step  39 . If no problem was found or condition still exists, go to next step.
  21. Repair open or high resistance in Black wire between chassis ground and cruise control module harness connector terminal "E". After repair, go to step  39 . If no problem was found or condition still exists, go to step  36 .
  22. Check cruise control release switch for proper adjustment. See CRUISE CONTROL RELEASE SWITCH & BRAKELIGHT SWITCH  under ADJUSTMENTS. Adjust switch if necessary. After adjustment, go to step  39 . If no problem was found or condition still exists, go to step  24 .
  23. Check brakelight switch for proper adjustment. See CRUISE CONTROL RELEASE SWITCH & BRAKELIGHT SWITCH  under ADJUSTMENTS. Adjust brakelight switch if necessary. After adjustment, go to step  39 . If no problem was found or condition still exists, go to step  26 .
  24. Repair open or short to ground in Brown wire between cruise control module harness connector terminal "D" and cruise control release switch harness connector. See WIRING DIAGRAMS  . After repair, go to step  39 . If no problem was found or condition still exists, go to step  34 .
  25. Repair short to voltage in Brown wire between cruise control module harness connector terminal "D" and cruise control release switch harness connector. See WIRING DIAGRAMS  . After repair, go to step  39 . If no problem was found or condition still exists, go to step  34 .
  26. Repair open or high resistance in White wire (Purple wire on Regal) between brakelight switch harness connector and cruise control module harness connector terminal "G". See WIRING DIAGRAMS  . After repair, go to step  39 . If no problem was found or condition still exists, go to step  35 .
  27. Repair open or short to ground in Gray wire between cruise control functional switches harness connector and cruise control module harness connector terminal "A". After repair, go to step  39 . If no problem was found or condition still exists, go to step  37 .
  28. Disconnect cruise control tester from cruise control module, but leave it connected to wiring harness. If CRUISE LAMP LED remained off after disconnection, go to step  30 . If CRUISE LAMP LED illuminated after disconnection, go to step  36 .
  29. Check Dark Green wire between cruise control module harness connector terminal "J" and Blue PCM harness connector C1 terminal No. 55 for open, short to ground or short to battery voltage. See WIRING DIAGRAMS  . Repair Dark Green wire as necessary. After repair, go to step  39 . If no problem was found or condition still exists, go to step  38 .
  30. Check White wire between cruise control module harness connector terminal "J" and Clear PCM harness connector C2 terminal No. 59 for open or short to ground. Repair White wire as necessary. After repair, go to step  39 . If no problem was found or condition still exists, go to step  38 .
  31. Check Dark Blue wire between cruise control module harness connector terminal "B" and cruise control functional switches harness connector for open or short to ground. Repair Dark Blue wire as necessary. After repair, go to step  39 . If no problem was found or condition still exists, go to step  37 .
  32. Check Gray/Black wire between cruise control module harness connector terminal "C" and cruise control functional switches harness connector for open or short to ground. See WIRING DIAGRAMS  . Repair Gray/Black wire as necessary. After repair, go to step  39 . If no problem was found or condition still exists, go to step  37 .
  33. Check Dark Green wire between Blue PCM harness connector C1 terminal No. 72 and cruise control module harness connector terminal "H" for open or high resistance. Repair Dark Green wire as necessary. After repair, go to step  39 . If no problem was found or condition still exists, go to step  38 .
  34. Replace cruise control release switch. See CRUISE CONTROL RELEASE SWITCH & BRAKELIGHT SWITCH  under REMOVAL & INSTALLATION. Adjust cruise control release switch. See CRUISE CONTROL RELEASE SWITCH & BRAKELIGHT SWITCH  under ADJUSTMENTS. After repair, go to step  39 .
  35. Replace brakelight switch. See CRUISE CONTROL RELEASE SWITCH & BRAKELIGHT SWITCH  under REMOVAL & INSTALLATION. Adjust cruise control brakelight switch. See CRUISE CONTROL RELEASE SWITCH & BRAKELIGHT SWITCH  under ADJUSTMENTS. After repair, go to step  39 .
  36. Replace cruise control module. See CRUISE CONTROL MODULE  under REMOVAL & INSTALLATION. After repair, go to step  39 .
  37. Replace cruise control functional switches. See CRUISE CONTROL FUNCTIONAL SWITCHES  under REMOVAL & INSTALLATION. After repair, go to step  39 .
  38. Replace and program PCM. See POWERTRAIN CONTROL MODULE (PCM)  under REMOVAL & INSTALLATION. To program PCM, see COMPUTER RELEARN PROCEDURES - GENERAL MOTORS CORP. article in GENERAL INFORMATION. After repair, go to next step.
  39. Road test vehicle and operate cruise control system. If cruise control functions normally, system is okay. If cruise control will not set or malfunctions, go to DIAGNOSTIC AIDS  .
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