LEMON Manuals: Even more car manuals for everyone: 1960-2025
Home >> Saturn >> 2000 >> SW2 Standard >> Repair and Diagnosis >> External Pages >> Different car >> Section 7 (Cruise Control System) >> Symptom Tests >> Cruise Control Inoperative
April 5, 2026: LEMON Manuals is launched! Read the announcement.

Cruise Control Inoperative

WARNING: This page is about a different car, the 2000 Chevrolet Corvette. 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 TROUBLE SHOOTING  . Ensure proper operation of brakelight system.
  1. Perform cruise control diagnostic system check. See DIAGNOSTIC SYSTEM CHECK  under SELF-DIAGNOSTIC SYSTEM. After completing system check, go to next step.
  2. Turn ignition switch to OFF position. Install scan tool. Turn ignition switch to ON position. Display Powertrain Control Module Cruise Control data list on scan tool. Turn cruise control functional switch to ON position. If scan tool displays cruise switch ON, go to step  3 . If scan tool does not display cruise switch ON, go to step  8 .
  3. Press and release R/A switch. If scan tool displays resume/accelerate switch ON and OFF, go to next step. If scan tool does not display resume/accelerate switch ON and OFF, go to step  16 .
  4. With cruise control switch in ON position, press and release SET switch. If scan tool displays SET switch ON and OFF, go to next step. If scan tool does not display SET switch ON and OFF, go to step  17 .
  5. Depress and release brake pedal. If scan tool displays TCC/CC brake switch APPLIED and RELEASED, go to next step. If scan tool does not display TCC/CC brake switch APPLIED and RELEASED, go to step  23 .
  6. Using scan tool. display CRUISE CONTROL DISENGAGE HISTORY 1-8. If display does not indicate a malfunction which would cause faulty operating condition, go to next step. If display indicates any condition(s) which could cause faulty operating condition, check and repair condition as necessary. After repair, check system for normal operation.
  7. Check cruise control switch signal circuits (ON/OFF, R/A and SET) for intermittent open or high resistance. See WIRING DIAGRAMS  . If problem is not found and corrected, system is okay at this time. If problem is found and corrected, go to step  29 .
  8. Check CR CONT fuse No. 20 (10-amp) located in instrument panel electrical center. If fuse is blown, go to next step. If fuse is okay, go to step  14 .
  9. Remove CR CONT fuse No. 20. Disconnect 4-pin multifunction switch harness connector C-217. Check Pink wire for short to ground between instrument panel electrical center CR CONT fuse terminal and multifunction switch harness connector C-217. See WIRING DIAGRAMS  . Repair Pink wire as necessary. After repair, go to step  29 . If no problem was found or condition still exists, go to next step.
  10. With 4-pin multifunction switch harness connector C-217 disconnected, connect test light to battery voltage. Probe multifunction switch terminal "B" (Pink wire). Turn cruise control switch to ON position. Press and release SET switch. Press and release R/A switch. If test light does not illuminate on any switch function, go to next step. If test light does illuminate on any switch function, go to step  22 .
  11. Connect test light to battery voltage. Probe multifunction switch harness connector terminals "A" (Gray wire), "C" (Dark Blue wire) and "D" (Gray/Black wire). See WIRING DIAGRAMS  . If test light does not illuminate on any circuit, problem is intermittent. Check for faulty connections and/or wiring. After repair, go to step  29 . If test light does illuminate on any circuit, go to next step.
  12. Disconnect Throttle Actuator Control (TAC) module harness 16-pin connector. To access TAC module, see THROTTLE ACTUATOR CONTROL (TAC) MODULE  under REMOVAL & INSTALLATION. Using a test light connected to battery voltage, probe multifunction switch harness connector terminals "A" (Gray wire), "C" (Dark Blue wire) and "D" (Gray/Black wire). If any circuit causes test light to illuminate, go to next step. If test light does not illuminate on any circuit, go to step  28 .
  13. Repair short to ground in circuit that caused test light to illuminate (Gray wire, Dark Blue wire and/or Gray/Black wire). See WIRING DIAGRAMS  . After repair, go to step  29 .
  14. Disconnect 4-pin multifunction switch harness connector C-217. Turn ignition switch to ON position. Connect test light between ground and multifunction switch harness connector C-217 terminal "B" (Pink wire). If test light illuminates, go to next step. If test light does not illuminate, go to step  18 .
  15. Connect a DVOM between multifunction switch harness connector C-217 terminals "A" (Gray wire) and "B" (Pink wire). Turn cruise control switch to ON position. If resistance is 0-2 ohms, go to step  19 . If resistance is not 0-2 ohms, go to step  22 .
  16. Disconnect 4-pin multifunction switch harness connector C-217. Connect a DVOM between multifunction switch harness connector C-217 terminals "B" (Pink wire) and "D" (Gray/Black wire). Press cruise control switch to R/A position. If resistance is 0-2 ohms, go to step  20 . If resistance is not 0-2 ohms, go to step  22 .
  17. Disconnect 4-pin multifunction switch harness connector C-217. Connect a DVOM between multifunction switch harness connector C-217 terminals "B" (Pink wire) and "C" (Dark Blue wire). Turn cruise control switch to ON position. If resistance is 0-2 ohms, go to step  21 . If resistance is not 0-2 ohms, go to step  22 .
  18. Repair open or high resistance in ignition feed circuit (Pink wire) between instrument panel electrical center and multifunction switch harness connector C-217. See WIRING DIAGRAMS  . After repair, go to step  29 .
  19. Repair open or high resistance in cruise control on/off signal circuit (Gray wire) between TAC module harness 16-pin connector and multifunction switch harness connector C-217 terminal "A". See WIRING DIAGRAMS  . If problem is found, repair wiring as necessary. If wire is okay, replace TAC module. See THROTTLE ACTUATOR CONTROL (TAC) MODULE  under REMOVAL & INSTALLATION. After repair, go to step  29 .
  20. Repair open or high resistance in cruise control R/A signal circuit (Gray/Black wire) between TAC module harness 16-pin connector and multifunction switch harness connector C-217 terminal "D". See WIRING DIAGRAMS  . If problem is found, repair wiring as necessary. If wire is okay, replace TAC module. See THROTTLE ACTUATOR CONTROL (TAC) MODULE  under REMOVAL & INSTALLATION. After repair, go to step  29 .
  21. Repair open or high resistance in cruise control SET signal circuit (Dark Blue wire) between TAC module harness 16-pin connector and multifunction switch harness connector C-217 terminal "C". See WIRING DIAGRAMS  . If problem is found, repair wiring wire as necessary. If wire is okay, replace TAC module. See THROTTLE ACTUATOR CONTROL (TAC) MODULE  under REMOVAL & INSTALLATION. After repair, go to step  29 .
  22. Replace multifunction switch. See MULTIFUNCTION SWITCH under REMOVAL & INSTALLATION in STEERING COLUMN SWITCHES - CORVETTE article. After repair, go to step  29 .
  23. Inspect brakelight switch for proper adjustment. See TCC BRAKE SWITCH (A/T), CRUISE CONTROL BRAKE SWITCH (M/T) & BRAKELIGHT SWITCH  under ADJUSTMENTS. If adjustment is okay, disconnect brakelight switch harness connector. Turn ignition switch to ON position. Using a test light connected to ground, probe Light Blue wire at brakelight switch harness connector. If test light illuminates, go to next step. If test lamp does not illuminate, go to step  26 .
  24. Turn ignition switch to OFF position and disconnect TCC brake switch (A/T) or cruise control brake switch (M/T) harness connector. Using a DVOM, test continuity of switch by probing between terminal "A" (Purple wire) and terminal "B" (Pink wire) while applying and releasing brakes. If switch opens and closes while applying and releasing brakes, go to next step. If switch does not open and close while applying and releasing brakes, go to step  27 .
  25. Repair open or high resistance in TCC brake switch (A/T)/cruise control brake switch (M/T) input circuit (Purple wire) between TCC brake switch (A/T)/cruise control brake switch (M/T) and Blue PCM harness connector C1 terminal No. 33. See WIRING DIAGRAMS  . If circuit is okay, replace and reprogram PCM. See POWERTRAIN CONTROL MODULE (PCM)  under REMOVAL & INSTALLATION. To program PCM, see COMPUTER RELEARN PROCEDURES -- GENERAL MOTORS article in GENERAL INFORMATION. After repair, go to step  29 .
  26. Repair open or high resistance in ignition feed circuit (Pink wire) between underhood fuse block and TCC brake switch (A/T)/cruise control brake switch (M/T). See WIRING DIAGRAMS  . After repair, go to step  29 .
  27. Replace brakelight switch. See TCC BRAKE SWITCH (A/T)/CRUISE CONTROL BRAKE SWITCH (M/T), BRAKELIGHT SWITCH & CLUTCH SWITCH (M/T)  under REMOVAL & INSTALLATION. After repair, go to step  29 .
  28. Replace TAC module. See THROTTLE ACTUATOR CONTROL (TAC) MODULE  under REMOVAL & INSTALLATION. After repair, go to step  29 .
  29. Install scan tool and clear any DTCs which may be set. See CLEARING DIAGNOSTIC TROUBLE CODES  under SELF-DIAGNOSTIC SYSTEM. Road test vehicle and fully exercise cruise control system. If system functions properly without setting any DTCs, repair is complete. If condition still exists, go to DIAGNOSTIC SYSTEM CHECK  under SELF-DIAGNOSTIC SYSTEM.
scientia non olet · About LEMON Manuals