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Cruise Control Inoperative

WARNING: This page does not describe the selected car, but rather 6 other vehicles, including the 2000 GMC Yukon XL, 2000 GMC Yukon, 2000 GMC Sierra, 2000 Chevrolet Tahoe, and 2000 Chevrolet Suburban. However, it is still accessible from the selected car via links, so may be relevant.
NOTE: To avoid misdiagnosis, perform PRELIMINARY INSPECTION  under TROUBLE SHOOTING.
  1. If cruise control diagnostic system check has been performed, go to next step. If cruise control diagnostic system check has not been performed, go to CRUISE CONTROL DIAGNOSTIC SYSTEM CHECK  under SELF-DIAGNOSTIC SYSTEM.
  2. Turn ignition switch to OFF position. Disconnect Throttle Actuator Control (TAC) module harness connector. See COMPONENT LOCATIONS  table. Turn ignition switch to ON and cruise control switch to OFF positions. Using test light connected to ground, individually probe TAC module harness connector C1 terminals No. 2 (Gray wire), No. 4 (Dark Blue wire) and No. 5 (Gray/Black wire). If test light does not illuminate, go to next step. If test light illuminates at any terminal, go to step  16 .
  3. Turn ignition and cruise control switches to ON position. Using test light connected to ground, probe TAC module harness connector C1 terminal No. 2 (Gray wire). If test light illuminates, go to next step. If test light does not illuminate, go to step  17 .
  4. Using test light connected to ground, probe TAC module harness connector C1 terminal No. 4 (Dark Blue wire). Press and hold SET/COAST switch. If test light illuminates when SET/COAST switch is pressed, go to next step. If test light does not illuminate when SET/COAST switch is pressed, go to step  19 .
  5. Using test light connected to ground, probe TAC module harness connector C1 terminal No. 5 (Gray/Black wire). Press and hold RESUME/ACCEL switch. If test light illuminates when RESUME/ACCEL switch is pressed, go to next step. If test light does not illuminate when RESUME/ACCEL switch is pressed, go to step  20 .
  6. Using test light connected to ground, probe TAC module harness connector C1 terminal No. 6 (Light Blue wire). If test light illuminates, go to step  23 . If test light does not illuminate, leave test light connected and go to next step.
  7. While monitoring test light, press and hold brake pedal. If test light illuminates, go to next step. If test light does not illuminate, go to step  21 .
  8. If vehicle is equipped with M/T, go to next step. If vehicle is equipped with A/T, go to step  11 .
  9. Turn ignition switch to OFF position. Disconnect PCM harness connectors. Turn ignition switch to ON position. Using test light connected to ground, probe PCM harness connector C1 terminal No. 35 (Gray wire). If test light illuminates, leave test light connected and go to next step. If test light does not illuminate, go to step  14 .
  10. While monitoring test light, press and hold clutch pedal. If test light goes out, go to next step. If test light remains illuminated, go to step  27 .
  11. Using test light connected to ground, probe TAC module harness connector C1 terminal No. 6 (Light Blue wire). If test light illuminates, leave test light connected and go to next step. If test light does not illuminate, go to step  15 .
  12. Press and hold brake pedal while monitoring test light. If test light remains illuminated, go to step  24 . If test light goes out, go to next step.
  13. Check speedometer for normal operation. If speedometer operates normally, go to step  33 . If speedometer does not operate normally, see appropriate ANALOG INSTRUMENT PANELS article.
  14. Turn ignition switch to OFF position. Disconnect Clutch Pedal Position (CPP) switch harness connector. Using test light connected to ground, probe CPP switch harness connector terminal "E" (Brown wire). If test light illuminates, go to step  28 . If test light does not illuminate, go to step  26 .
  15. Turn ignition switch to OFF position. Disconnect brakelight switch harness connector. Using test light connected to ground, probe brakelight switch harness connector terminal "B" (Orange wire). If test light illuminates, go to step  25 . If test light does not illuminate, go to step  29 .
  16. Check wire(s) causing test light to illuminate for short to battery voltage. See WIRING DIAGRAMS  . Repair wire(s) as necessary. After repair, go to step  38 . If wires in question are okay, go to step  32 .
  17. Individually check Gray, Dark Blue and Gray/Black wires between cruise control functional switch harness connector and TAC module harness connector C1 for open, high resistance or short to ground. See WIRING DIAGRAMS  . Repair wire(s) as necessary. After repair, go to step  38 . If wire(s) is okay, go to next step.
  18. Check Brown wire between cruise control functional switches harness connector terminal A13 and fuse block CRUISE fuse (10-amp) harness connector C1 terminal E2 for open, high resistance or short to ground. Repair Brown wire as necessary. After repair, go to step  38 . If wire is okay, go to step  32 .
  19. Check Dark Blue wire between cruise control functional switches harness connector terminal A14 and TAC module harness connector C1 terminal No. 4 for open, high resistance or short to ground. See WIRING DIAGRAMS  . Repair Dark Blue wire as necessary. After repair, go to step  38 . If wire is okay, go to step  32 .
  20. Check Gray/Black wire between cruise control functional switches harness connector terminal A15 and TAC module harness connector C1 terminal No. 5 for open, high resistance or short to ground. Repair Gray/Black wire as necessary. After repair, go to step  38 . If wire is okay, go to step  32 .
  21. Check Light Blue wire between engine wiring harness junction block harness connector C2 terminal A10 and TAC module harness connector C1 terminal No. 6 for open, high resistance or short to ground. Repair Light Blue wire as necessary. After repair, go to step  38 . If wire is okay, go to next step.
  22. Check Orange wire between brakelight switch harness connector terminal "B" and engine wiring harness junction block STOP LPS fuse (20-amp) harness connector C1 terminal F12 for open, high resistance or short to ground. Repair Orange wire as necessary. After repair, go to step  38 . If wire is okay, go to step  31 .
  23. Check Light Blue wire between engine wiring harness junction block harness connector C2 terminal A10 and TAC module harness connector C1 terminal No. 6 for short to voltage. Repair Light Blue wire as necessary. After repair, go to step  38 . If wire is okay, go to step  31 .
  24. Check White wire between brakelight switch harness connector terminal "A" and engine wiring harness junction block harness connector C1 terminal D11 for short to voltage. Repair White wire as necessary. After repair, go to step  38 . If wire is okay, go to step  31 .
  25. Check Light Blue wire between engine wiring harness junction block harness connector C2 terminal A10 and TAC module harness connector C1 terminal No. 6 for open or high resistance. Repair Light Blue wire as necessary. After repair, go to step  38 . If wire is okay, go to step  31 .
  26. Check Gray wire between CPP switch harness connector terminal "F" and PCM harness connector C1 terminal No. 35 for open, high resistance or short to ground. Repair Gray wire as necessary. After repair, go to step  38 . If wire is okay, go to step  30 .
  27. Check Gray wire between CPP switch harness connector terminal "F" and PCM harness connector C1 terminal No. 35 for short to voltage. Repair Gray wire as necessary. After repair, go to step  38 . If wire is okay, go to step  30 .
  28. Repair open in Brown wire between CPP switch harness connector terminal "E" and fuse block CRUISE fuse (10-amp) harness connector C1 terminal C1. After repair, go to step  38 .
  29. Repair open in Orange wire between stoplight switch harness connector terminal "B" and engine wiring harness junction block STOP LPS fuse (20-amp) harness connector C1 terminal F12. Fuse block is located on left side of engine compartment. After repair, go to step  38 .
  30. Check for poor connections or connector damage at CPP switch harness connector. Repair or replace as necessary. After repair, go to step  38 . If connections are okay, go to step  34 .
  31. Check for poor connections or connector damage at stoplight switch harness connector. Repair or replace as necessary. After repair, go to step  38 . If connections are okay, go to step  35 .
  32. Check for poor connections or connector damage at cruise control functional switches harness connector. Repair or replace as necessary. After repair, go to step  38 . If connections are okay, go to step  36 .
  33. Check for poor connections or connector damage at TAC module harness connector. Repair or replace as necessary. After repair, go to step  38 . If connections are okay, go to step  37 .
  34. Replace CPP switch. See BRAKELIGHT & CLUTCH PEDAL POSITION (CPP) SWITCHES  under REMOVAL & INSTALLATION. After repair, go to step  38 .
  35. Replace stoplight switch. See BRAKELIGHT & CLUTCH PEDAL POSITION (CPP) SWITCHES  under REMOVAL & INSTALLATION. After repair, go to step  38 .
  36. Replace cruise control functional switches. See CRUISE CONTROL FUNCTIONAL SWITCHES  under REMOVAL & INSTALLATION. After repair, go to step  38 .
  37. Replace TAC module. See THROTTLE ACTUATOR CONTROL (TAC) MODULE  under REMOVAL & INSTALLATION. After repair, go to next step.
  38. Road test vehicle and operate cruise control system. If cruise control system operates normally, repairs are complete. If cruise control system still malfunctions, return to step  2 .
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