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Cruise Control Inoperative/Malfunctioning

WARNING: This page is about a different car, the 2000 Cadillac Catera. 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 diagnostic system check, go to next step.
  2. Turn ignition switch to OFF position. Disconnect Black ECM harness connector C2. Turn ignition switch to ON position with engine off. Using a test light connected to ground, probe RESUME/DECEL signal circuit (Black/Green wire at ECM harness connector C2 terminal No. 10) and SET/ACCEL signal circuit (Black/Yellow wire at ECM harness connector C2 terminal No. 43). If test light illuminates, go to step  11 . If test light does not illuminate, go to next step.
  3. Using a test light connected to ground, probe ON/OFF signal circuit (Black/Red wire at ECM harness connector C2 terminal No. 42). If test light illuminates, go to step  5 . If test light does not illuminate, go to next step.
  4. Turn ignition switch to OFF position. Disconnect cruise control functional switches harness connector at multifunction turn signal lever pigtail connector. Turn ignition switch to ON position with engine off. Using a test light connected to ground, probe ignition feed circuit (Brown wire at cruise control functional switches connector terminal "B"). If test light illuminates, go to step  12 . If test light does not illuminate, go to step  13 .
  5. Using a test light connected to ground, probe SET/ACCEL signal circuit (Black/Yellow wire at ECM harness connector C2 terminal No. 43). Press and hold SET/ACCEL switch. If test light illuminates with switch depressed, go to next step. If test light does not illuminate with switch depressed, go to step  14 .
  6. Using a test light connected to ground, probe RESUME/DECEL signal circuit (Black/Green wire at ECM harness connector C2 terminal No. 10). Press and hold RESUME/DECEL switch. If test light illuminates with switch depressed, go to next step. If test light does not illuminate with switch depressed, go to step  15 .
  7. Using a test light connected to ground, probe brakelight switch signal circuit (Black/Yellow wire at ECM harness connector C2 terminal No. 27). See WIRING DIAGRAMS  . If test light does not illuminate, go to next step. If test light illuminates, go to step  21 .
  8. While probing brakelight switch signal circuit (Black/Yellow wire at ECM harness connector C2 terminal No. 27) with test light connected to ground, apply brake pedal. If test light illuminates with brake pedal applied, go to next step. If test light does not illuminate with brake pedal applied, go to step  16 .
  9. Using a test light connected to ground, probe cruise release signal circuit (Black/Brown wire at ECM harness connector C2 terminal No. 26). If test light illuminates, go to next step. If test light does not illuminate, go to step  17 .
  10. While probing cruise release signal circuit (Black/Brown wire at ECM harness connector C2 terminal No. 26) with test light connected to ground, apply brake pedal. See WIRING DIAGRAMS  . If test light illuminates with brake pedal applied, go to next step. If test light does not illuminate with brake pedal applied, go to step  17 .
  11. Test signal circuit (RESUME/DECEL or SET/ACCEL) that caused test light to illuminate for short to voltage. Repair as necessary. After repair, go to step  30 . If no problem was found or condition still exists, go to step  23 .
  12. Test ON/OFF signal circuit (Black/Red wire at ECM harness connector C2 terminal No. 42) for an open or high resistance. See WIRING DIAGRAMS  . Repair as necessary. After repair, go to step  30 . If no problem was found or condition still exists, go to step  22 .
  13. Test ignition feed circuit (Brown wire at cruise control functional switches connector terminal "B") for an open, high resistance, or short to ground. Test cruise control signal circuits (ON/OFF, RESUME/DECEL and SET/ACCEL) at Black ECM harness connector C2 for shorts to ground. See WIRING DIAGRAMS  . Repair required circuit as necessary. After repair, go to step  30 . If no problem was found or condition still exists, go to step  24 .
  14. Test SET/ACCEL signal circuit (Black/Yellow wire at ECM harness connector C2 terminal No. 43) for an open, high resistance or short to ground. Repair circuit as necessary. After repair, go to step  30 . If no problem was found or condition still exists, go to step  24 .
  15. Test SET/ACCEL signal circuit (Black/Green wire at ECM harness connector C2 terminal No. 10) for an open, high resistance or short to ground. Repair circuit as necessary. After repair, go to step  30 . If no problem was found or condition still exists, go to step  24 .
  16. Test ignition feed circuit (Red wire at brakelight switch harness connector terminal No. 1) for an open, high resistance or short to ground. Repair circuit as necessary. After repair, go to step  30 . If no problem was found or condition still exists, go to step  20 .
  17. Test cruise release signal circuit (Black/Brown wire at ECM harness connector C2 terminal No. 26) for an open, high resistance or short to ground. Repair circuit as necessary. After repair, go to step  30 . If no problem was found or condition still exists, go to next step.
  18. Test ignition feed circuit (Brown wire at cruise control release switch harness connector terminal No. 1) for an open, high resistance or short to ground. Repair circuit as necessary. After repair, go to step  30 . If no problem was found or condition still exists, go to step  22 .
  19. Test cruise release signal circuit (Black/Brown wire at ECM harness connector C2 terminal No. 26) for short to voltage. Repair circuit as necessary. After repair, go to step  30 . If no problem was found or condition still exists, go to step  22 .
  20. Test brakelight switch signal circuit (Black/Yellow wire at ECM harness connector C2 terminal No. 27) for an open, high resistance or short to ground. Repair circuit as necessary. After repair, go to step  30 . If no problem was found or condition still exists, go to step  23 .
  21. Test brakelight switch signal circuit (Black/Yellow wire at ECM harness connector C2 terminal No. 27) for short to voltage. Repair circuit as necessary. After repair, go to step  30 . If no problem was found or condition still exists, go to step  23 .
  22. Inspect harness and connector at cruise control release switch. Inspect for damaged pins, corrosion and loose wires. An intermittent problem can be caused by a poor connection, rubbed-through wire insulation or broken wire inside insulation. Repair as necessary. After repair, go to step  30 . If no problem was found or condition still exists, go to step  26 .
  23. Inspect harness and connector at brakelight switch. Inspect for damaged pins, corrosion and loose wires. An intermittent problem can be caused by a poor connection, rubbed-through wire insulation or broken wire inside insulation. Repair as necessary. After repair, go to step  30 . If no problem was found or condition still exists, go to step  27 .
  24. Inspect harness and connector at cruise control functional switches harness connector at multifunction turn signal lever pigtail connector. Inspect for damaged pins, corrosion and loose wires. An intermittent problem can be caused by a poor connection, rubbed-through wire insulation or broken wire inside insulation. Repair as necessary. After repair, go to step  30 . If no problem was found or condition still exists, go to step  28 .
  25. Inspect harness and connectors at ECM. Inspect for damaged pins, corrosion and loose wires. An intermittent problem can be caused by a poor connection, rubbed-through wire insulation or broken wire inside insulation. Repair as necessary. After repair, go to step  30 . If no problem was found or condition still exists, go to step  29 .
  26. Replace cruise control release switch. See CRUISE CONTROL RELEASE SWITCH  under REMOVAL & INSTALLATION. Adjust switch. See CRUISE CONTROL RELEASE SWITCH  under ADJUSTMENTS. After repair, go to step  30 .
  27. Replace brakelight switch. See BRAKELIGHT SWITCH  under REMOVAL & INSTALLATION. Adjust switch. See BRAKELIGHT SWITCH  under ADJUSTMENTS. After repair, go to step  30 .
  28. Replace multifunction switch. See CRUISE CONTROL FUNCTIONAL SWITCHES  article. After repair, go to step  30 .
  29. Replace ECM switch. See ENGINE CONTROL MODULE (ECM)  under REMOVAL & INSTALLATION. After repair, go to next step.
  30. Operate vehicle within conditions for cruise control system operation. Fully test functionality of cruise control system. If cruise control system operates properly, system is okay. If cruise control system does not operate properly, inspect for proper operation of brakelights and ensure no DTCs are stored in ECM memory. Perform OBD system check. See SELF-DIAGNOSTICS -- GASOLINE -- 3.0L "V" BODY article in ENGINE PERFORMANCE.
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