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Cruise Control Inoperative

NOTE: To avoid misdiagnosis, perform system test and trouble shooting. See SYSTEM TEST  and TROUBLE SHOOTING. Check for stored DTCs. See appropriate TESTS W/CODES article in ENGINE PERFORMANCE section:
  1. Connect scan tool to Data Link Connector (DLC). Using scan tool, select CRUISE CONTROL, and then select SPECIAL FUNCTIONS. Turn ignition switch to ON position with engine off. Using scan tool, select STEPPER MOTOR TEST. Observe throttle and actuate stepper motor. If throttle moves to Wide Open Throttle (WOT), go to step 6). If throttle does not move to WOT, go to next step.
  2. Turn cruise control switch to OFF position. Disconnect cruise control module connector. Turn ignition switch to On position. Using a DVOM, measure voltage between cruise control module connector (harness side) terminal "F" (Brown wire) and ground. See WIRING DIAGRAMS  . If battery voltage is present, go to step 4). If battery voltage is not present, go to next step.
  3. Locate and repair open or high resistance in Brown wire between cruise control module and fuse block located behind left side of instrument panel. After repairs, go to step 27).
  4. Using a DVOM, measure resistance between cruise control module connector (harness side) terminal "E" (Black wire) and ground. See WIRING DIAGRAMS  . If resistance is less than 5 ohms, go to step 6). If resistance is greater than 5 ohms, go to next step.
  5. Locate and repair open or high resistance in Black wire between cruise control module and ground connection. After repairs are complete, go to step 27).
  6. Using scan tool, select TIP SWITCH 0 from data list. Turn cruise control switch to ON position. If scan tool displays tip switch ACTIVE, go to step 8). If scan tool does not display ACTIVE, go to next step.
  7. Disconnect cruise control switch connector. Connect a fused jumper wire between cruise control switch connector (harness side) terminals "A" (Black/Red wire) and "B" (Brown wire). See WIRING DIAGRAMS  . Turn ignition switch to ON position. If scan tool now displays ACTIVE, go to step 9). If scan tool does not display ACTIVE, go to step 10).
  8. Using scan tool, select TIP SWITCH 1 from data list. Press and hold SET/ACCEL button. If scan tool displays ACTIVE, go to step 11). If scan tool does not display ACTIVE, go to step 12).
  9. Replace cruise control functional switch. See procedures in CRUISE CONTROL FUNCTIONAL SWITCHES  . After repairs, go to step 27).
  10. Locate and repair open or high resistance in Black/Red wire between cruise control module and cruise control switch. Locate and repair open or high resistance in Brown wire between cruise control switch and fuse block located behind left side of instrument panel. After repairs, go to step 27).
  11. Using scan tool, select CRUISE CONTROL. Turn ignition switch to ON position with engine off. Depress brake pedal. Shift transmission into Drive. Release brake pedal. If scan tool displays ALLOWED, go to step 13). If scan tool does not display ALLOWED, go to step 14).
  12. Disconnect cruise control switch connector. Connect a fused jumper wire between cruise control switch connector (harness side) terminals "D" (Black/Yellow wire) and "B" (Brown wire). See WIRING DIAGRAMS  . If scan tool displays ACTIVE, go to step 15). If scan tool does not display ACTIVE, go to step 16).
  13. Prepare vehicle for a road test. Using scan tool, select VEHICLE SPEED. Road test vehicle and observe vehicle speed on scan tool. If scan tool displays vehicle speed, go to step 17). If scan tool does not display vehicle speed, go to step 18).
  14. Disconnect cruise control module connector. Turn ignition switch to ON position. Depress brake pedal. Shift transmission into Drive. Release brake pedal. Using a DVOM, measure voltage between cruise control module connector (harness side) terminal "D" (Black/Blue wire) and ground. See WIRING DIAGRAMS  . If battery voltage is present, go to step 19). If battery voltage is not present, go to step 20).
  15. Replace cruise control functional switch. See procedures in CRUISE CONTROL FUNCTIONAL SWITCHES  . After repairs, go to step 27).
  16. Locate and repair open or high resistance in Black/Yellow wire between cruise control module and cruise control switch. Locate and repair open or high resistance in Brown wire between cruise control switch and fuse block located behind left side of instrument panel. After repairs, go to step 27).
  17. Check for poor connections between Electronic Brake Traction Control Module (EBTCM) and cruise control module. If connections are okay, replace cruise control module. See procedures in CRUISE CONTROL MODULE  . After repairs, go to step 27).
  18. Check for current ABS DTCs 44 and 45. If DTC(s) is set, diagnose DTC(s). See ANTI-LOCK BRAKE article in BRAKES section. If DTC(s) is not set, go to step 21).
  19. While monitoring DVOM, depress brake pedal. Depress brake pedal several times to ensure cruise control release switch does not intermittently stick. If battery voltage is present, go to step 23). If battery voltage is not present, go to step 25).
  20. Disconnect cruise control release switch connector. Connect a fused jumper wire between cruise control release switch connector (harness side) terminals No. 1 (Black/Yellow wire) and No. 2 (Black/Blue wire). See WIRING DIAGRAMS  . Shift transmission into Drive. Using a DVOM, measure voltage at cruise control module connector (harness side) terminal "D" (Black/Blue wire). If battery voltage is present, go to step 24). If battery voltage is not present, go to step 25).
  21. Disconnect cruise control module connector. Raise drive wheels. Turn ignition switch to ON position. Set DVOM to AC scale. Using DVOM, measure voltage at cruise control module connector (harness side) terminal "K" (Blue/Red wire) and ground while rotating left rear drive wheel. See WIRING DIAGRAMS  . If voltage is greater than one volt, go to next step. If voltage is one volt or less, go to step 26).
  22. Check for poor connection at cruise control module. If connection is okay, replace cruise control module. See CRUISE CONTROL MODULE  . After repairs, go to step 27).
  23. Check for a short to voltage in Black/Blue wire between cruise control release switch and cruise control module. If Black/Blue wire is okay, replace cruise control release switch. See procedures in CRUISE CONTROL RELEASE SWITCH & BRAKE SWITCH  . After repairs, go to step 27).
  24. Replace cruise control release switch. See procedures in CRUISE CONTROL RELEASE SWITCH & BRAKE SWITCH  . After repairs, go to step 27).
  25. Locate and repair poor connections or open in Black/Yellow wire between cruise control module and automatic transmission range switch. After repairs, go to step 27).
  26. Locate and repair poor connections or open in Blue/Red wire between Electronic Brake Traction Control Module (EBTCM) and cruise control module. After repairs, go to next step.
  27. Reconnect all connectors and components. Ensure cruise control system operates properly. If cruise control system does not operate properly, go to step 1).
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