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Cruise Control Inoperative/Malfunctioning (Using Tester J42958)

  1. Connect cruise control tester (J42598) between cruise control module harness connector and cruise control module. Ensure cruise control switch is in OFF position. Turn ignition switch to ON position. If IGNITION LED on cruise control tester illuminates, go to next step. If IGNITION LED does not illuminate, go to step  19 .
  2. If BRAKE/TCC LED on cruise control tester illuminates, go to next step. If BRAKE/TCC LED does not illuminate, go to step  21 .
  3. If BRAKE LIGHTS LED on cruise control tester illuminates, go to next step. If BRAKE LIGHTS LED does not illuminate, go to step  22 .
  4. Press and release brake pedal. If BRAKE/TCC LED on cruise control tester illuminates, go to next step. If BRAKE/TCC LED does not illuminate, go to step  24 .
  5. Turn cruise control switch to ON position. If ON/OFF and INHIBIT/ENABLE LEDs on cruise control tester illuminate, go to next step. If ON/OFF and INHIBIT/ENABLE LEDs do not illuminate, go to step  26 .
  6. If CRUISE LAMP LED on cruise control tester illuminates, go to next step. If CRUISE LAMP LED does not illuminate, go to step  27 .
  7. Press and release cruise control SET/COAST switch. If SET/COAST LED on cruise control tester illuminates when switch is pressed and goes out when switch is released, go to next step. If SET/COAST LED does not illuminate as described, go to step  29 .
  8. Press and release cruise control RESUME/ACCEL switch. If RESUME/ACCEL LED on cruise control tester illuminates when switch is pressed and go out when switch is released, go to next step. If RESUME/ACCEL LED does not illuminate as described, go to step  30 .
  9. Perform the following operations in the sequence listed:
    • Press and release INHIBIT OVERRIDE button on cruise control tester.
    • Press and release BRAKE button on cruise control tester.
    • Press and release S/C button on cruise control tester.
    If CRUISE ENGAGE LED on cruise control tester illuminates continually after S/C switch is pressed, go to next step. If CRUISE ENGAGE LED does not illuminate as described, go to step  19 .
  10. While observing throttle lever on throttle body, press and hold R/A button on cruise control tester for 5 seconds, then release. If throttle lever moves toward full open throttle, then closes to about one-half throttle position when R/A button is released, go to next step. If throttle lever does not function as described, go to step  36 .
  11. While observing throttle lever on throttle body, press and hold S/C button on cruise control tester for 5 seconds, then release. If throttle lever moves toward closed throttle, then returns to about one-half throttle position when S/C button is released, go to next step. If throttle lever does not function as described, go to step  36 .
  12. Press and release (tap) R/A button on cruise control tester 3 times. Press and release BRAKE button on cruise control tester. If CRUISE ENGAGE LED on cruise control tester turns off and throttle lever closes, go to next step. If CRUISE ENGAGE LED and throttle lever do not respond as described, go to step  35 .
  13. Raise and support vehicle so drive wheels may be rotated. Block one drive wheel to prevent rotation. Turn ignition switch to ON position and set gear selector in DRIVE position. Observe VSS LED on cruise control tester while rotating unblocked drive wheel. If VSS LED flashes during wheel rotation, go to next step. If VSS LED does not flash, go to step  32 .
  14. If cruise control module harness connector has a Green wire attached to terminal "H", go to next step. If there is no wire attached to terminal "H", go to step  18 .
  15. Following manufacturer's instructions, connect General Motors Tech 2 scan tool. Turn ignition switch to ON position. Select POWERTRAIN SPECIAL FUNCTIONS and then OUTPUT CONTROLS for CRUISE INHIBIT. While observing INHIBIT ENABLE LED on cruise control tester, command scan tool to ENABLE cruise control system. If INHIBIT ENABLE LED on cruise control tester illuminates, go to next step. If INHIBIT ENABLE LED does not illuminate, go to step  31 .
  16. Turn ignition switch to OFF position. Disconnect cruise control tester and reconnect wiring harness to cruise control module. Road test vehicle at greater than 25 MPH. Engage cruise control system. Using scan tool, observe CRUISE INHIBIT status. If scan tool displays ENABLED, go to next step. If scan tool does not display ENABLED, go to appropriate SELF-DIAGNOSTICS article in ENGINE PERFORMANCE.
  17. If cruise control system operates normally, problem is intermittent. Go to PRELIMINARY INSPECTION  under TROUBLE SHOOTING. If cruise control system does not operate normally, go to step  35 .
  18. Reconnect all components. Road test vehicle at speeds greater than 25 MPH. Operate cruise control. If system operates normally, problem is intermittent. Go to PRELIMINARY INSPECTION  under TROUBLE SHOOTING. If system does not operate normally, go to step  35 .
  19. Check Brown wire between cruise control module harness connector terminal "F" and CRUISE fuse No. 6 (10-amp) in instrument panel fuse block for open, high resistance or short to ground. Repair Brown wire as necessary. After repair, check system for normal operation. If wire is okay, go to next step.
  20. Repair open or high resistance in Black wire between cruise control module harness connector terminal "E" and ground. After repair, check system for normal operation. If problem still exists, go to step  34 .
  21. Check cruise control release switch for proper installation, adjustment or damage. See BRAKE PEDAL POSITION (BPP) SWITCH  under ADJUSTMENTS. Repair or replace as necessary. After repair, check system for normal operation. If no problem is found, go to step  23 .
  22. Check brakelight switch for proper installation, adjustment or damage. See BRAKE PEDAL POSITION (BPP) SWITCH  under ADJUSTMENTS. Repair or replace as necessary. After repair, check system for normal operation. If no problem is found, go to step  25 .
  23. Repair open or high resistance in Purple wire between cruise control module harness connector terminal "D" and BPP switch harness connector terminal "C". See WIRING DIAGRAMS  . After repair, check system for normal operation. If problem still exists, go to step  33 .
  24. Repair short to voltage in Purple wire between cruise control module harness connector terminal "D" and BPP switch harness connector terminal "C". After repair, check system for normal operation. If problem still exists, go to step  33 .
  25. Repair open or high resistance in White wire between cruise control module harness connector terminal "G" and BPP switch harness connector terminal "A". After repair, check system for normal operation. If problem still exists, go to step  34 .
  26. Repair open or short to ground in Gray wire between cruise control module harness connector terminal "A" and cruise control functional switches harness connector terminal A12. After repair. check system for normal operation. If problem still exists, go to step  35 .
  27. Disconnect cruise control tester from cruise control module, but leave it connected to harness connector. If CRUISE LAMP LED on cruise control tester remains off, go to next step. If CRUISE LAMP LED illuminates, go to step  35 .
  28. Check Light Blue/Black wire between cruise control module harness connector terminal "J" and VCM harness connector C4 terminal No. 24 for open or short to ground. Repair Light Blue/Black wire as necessary. After repair, check system for normal operation. If wire is okay, go to step  36 .
  29. Check Dark Blue wire between cruise control module harness connector terminal "B" and cruise control functional switches harness connector terminal A14 for open or short to ground. Repair Dark Blue wire as necessary. After repair, check system for normal operation. If wire is okay, go to step  35 .
  30. Check Gray/Black wire between cruise control module harness connector terminal "C" and cruise control functional switches harness connector terminal A15 for short to voltage. Repair Gray/Black wire as necessary. After repair, check system for normal operation. If wire is okay, go to step  35 .
  31. Check Light Blue/Black wire between cruise control module harness connector terminal "J" and VCM harness connector C4 terminal No. 24 for open or high resistance. Repair Light Blue/Black wire as necessary. After repair, check system for normal operation. If wire is okay, go to step  37 .
  32. Check Dark Green/White wire between cruise control module harness connector terminal "K" and VCM harness connector C4 terminal No. 3 for open or high resistance. See WIRING DIAGRAMS  . Repair Dark Green/White wire as necessary. After repair, check system for normal operation. If wire is okay, go to step  37 .
  33. Replace cruise control release switch. See BRAKE PEDAL POSITION (BPP) SWITCH  under REMOVAL & INSTALLATION. After repair, check system for normal operation.
  34. Replace brakelight switch. See BRAKE PEDAL POSITION (BPP) SWITCH  under REMOVAL & INSTALLATION. After repair, check system for normal operation.
  35. Replace cruise control module assembly. See CRUISE CONTROL MODULE ASSEMBLY  under REMOVAL & INSTALLATION. After repair, check system for normal operation.
  36. Replace cruise control functional switches. See CRUISE CONTROL FUNCTIONAL SWITCHES  under REMOVAL & INSTALLATION. After repair, check system for normal operation.
  37. Replace VCM. See appropriate SELF-DIAGNOSTICS article in ENGINE PERFORMANCE. After repair, check system for normal operation. If cruise control system is still inoperative or malfunctioning, return to step  1 .
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