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Cruise Control Is Inoperative

NOTE: To avoid misdiagnosis, perform rev test and trouble shooting. See REV TEST  and TROUBLE SHOOTING. Check for stored DTCs. See TESTS W/CODES article in ENGINE PERFORMANCE section.
  1. Check STOP LAMPS fuse (15-amp) located in fuse block, in right front door opening. If fuse is blown, go to next step. If fuse is okay, go to step 3).
  2. Repair short to ground in Orange wire between fuse block and brake switch. See WIRING DIAGRAMS  . Replace STOP LAMPS fuse.
  3. Check CRUISE fuse (10-amp) located in fuse block, in right front door opening. If fuse is blown, go to next step. If fuse is okay, go to step 5).
  4. Repair short to ground in Pink wire between fuse block and cruise control module assembly. See WIRING DIAGRAMS  . Replace CRUISE fuse (10-amp).
  5. Turn cruise control switch to OFF position. Disconnect cruise control module assembly connector. Turn ignition switch to RUN position. Using a test light connected to ground, probe cruise control module assembly connector (harness side) terminal "F" (Pink wire). See WIRING DIAGRAMS  . If test light illuminates, go to next step. If test light does not illuminate, go to step 20).
  6. Using a test light, probe between cruise control module assembly connector (harness side) terminals "F" (Pink wire) and "E" (Black wire). See WIRING DIAGRAMS  . If test light illuminates, go to next step. If test light does not illuminate, go to step 21).
  7. Turn cruise control switch to ON position. Using a test light, probe between cruise control module assembly connector (harness side) terminals "A" (Gray wire) and "E" (Black wire). See WIRING DIAGRAMS  . If test light illuminates, go to next step. If test light does not illuminate, go to step 22).
  8. Press and hold cruise control switch in SET position. Using a test light, probe between cruise control module assembly connector (harness side) terminals "B" (Dark Blue wire) and "E" (Black wire). See WIRING DIAGRAMS  . If test light illuminates, go to next step. If test light does not illuminate, go to step 30).
  9. Press and hold cruise control switch in SET position. Using a test light, probe between cruise control module assembly connector (harness side) terminals "C" (Gray/Black wire) and "E" (Black wire). See WIRING DIAGRAMS  . If test light illuminates, go to step 34). If test light does not illuminate, go to next step.
  10. Using a test light, probe between cruise control module assembly connector (harness side) terminals "D" (Brown wire) and "E" (Black wire). See WIRING DIAGRAMS  . If test light illuminates, go to next step. If test light does not illuminate, go to step 36).
  11. Using a test light, probe between cruise control module assembly connector (harness side) terminals "B" (Dark Blue wire) and "E" (Black wire). See WIRING DIAGRAMS  . If test light illuminates, go to step 43). If test light does not illuminate, go to next step.
  12. Using a test light, probe between cruise control module assembly connector (harness side) terminals "C" (Gray/Black wire) and "E" (Black wire). See WIRING DIAGRAMS  . If test light illuminates, go to step 45). If test light does not illuminate, go to next step.
  13. Set parking brake. Raise drive wheels. Using a DVOM, measure voltage between cruise control module assembly connector (harness side) terminal "K" (Dark Green wire) and ground while rotating drive wheels. See WIRING DIAGRAMS  . If voltage is 0-5 volts, go to next step. If voltage is not 0-5 volts, go to step 47).
  14. Turn ignition switch to OFF position. Check for a poor connection or open in Dark Green wire (cruise disable output circuit) between cruise control module assembly and Powertrain Control Module (PCM). Reinstall cruise control module assembly. Connect scan tool to Data Link Connector (DLC). Start engine. Clear any existing Diagnostic Trouble Codes (DTCs). Using scan tool, monitor SMCC INHIBITED display. Attempt to operate vehicle in cruise control. If SMCC INHIBITED is displayed on scan tool, go to step 49). If SMCC INHIBITED is not displayed on scan tool, go to next step.
  15. Turn ignition switch to OFF position, and then to RUN position. Clear any existing DTCs. Using scan tool, select MODE 4 diagnostics. Using scan tool, command SMCC to ALLOW cruise. Using a test light, probe between cruise control module assembly connector (harness side) terminal "H" (Dark Green wire) and battery voltage. See WIRING DIAGRAMS  . If test light illuminates, go to next step. If test light does not illuminate, go to step 17).
  16. Replace cruise control module assembly. See procedures in CRUISE CONTROL MODULE ASSEMBLY  .
  17. Check for a short to voltage in Dark Green wire between cruise control module assembly and Powertrain Control Module (PCM). See WIRING DIAGRAMS  . If Dark Green wire is faulty, go to next step. If Dark Green wire is okay, go to step 19).
  18. Repair short to voltage in Dark Green wire between cruise control module assembly and Powertrain Control Module (PCM).
  19. Check PCM. See TESTS W/CODES article in ENGINE PERFORMANCE section.
  20. Repair poor connection or open in Pink wire between fuse block and cruise control module assembly.
  21. Repair poor connection or open in Black wire between cruise control module assembly and ground connection.
  22. Using a test light, probe between cruise control module assembly connector (harness side) terminals "B" (Dark Blue wire) and "E" (Black wire). See WIRING DIAGRAMS  . While observing test light, press and hold cruise control switch in SET position. If test light illuminates, go to step 28). If test light does not illuminate, go to next step.
  23. Check for a short to ground in Gray wire between cruise control functional switches and cruise control module assembly. See WIRING DIAGRAMS  . If Gray wire is faulty, go to next step. If Gray wire is okay, go to step 25).
  24. Repair short to ground in Gray wire between cruise control functional switches and cruise control module assembly.
  25. Check for a poor connection or open in Gray wire between cruise control functional switches and cruise control module assembly. See WIRING DIAGRAMS  . If Gray wire is faulty, go to next step. If Gray wire is okay, go to step 27).
  26. Repair poor connection or open in Gray wire between cruise control functional switches and cruise control module assembly.
  27. Replace cruise control functional switches. See procedures in CRUISE CONTROL FUNCTIONAL SWITCHES  .
  28. Check for a poor connection or open in Pink wire between fuse block and cruise control module assembly. See WIRING DIAGRAMS  . If Pink wire is faulty, go to next step. If Pink wire is okay, go to step 27).
  29. Repair poor connection or open in Pink wire between fuse block and cruise control module assembly.
  30. Check for a short to ground in Dark Blue wire between cruise control functional switches and cruise control module assembly. See WIRING DIAGRAMS  . If Dark Blue wire is faulty, go to next step. If Dark Blue wire is okay, go to step 32).
  31. Repair short to ground in Dark Blue wire between cruise control functional switches and cruise control module assembly.
  32. Check for a poor connection or open in Dark Blue wire between cruise control functional switches and cruise control module assembly. See WIRING DIAGRAMS  . If Dark Blue wire is faulty, go to next step. If Dark Blue wire is okay, go to step 27).
  33. Repair poor connection or open in Dark Blue wire between cruise control functional switches and cruise control module assembly.
  34. Check Gray/Black wire for a short to Dark Blue wire between cruise control functional switches and cruise control module assembly. See WIRING DIAGRAMS  . If Gray/Black wire is faulty, go to next step. If Gray/Black wire is okay, go to step 27).
  35. Repair short in Gray/Black wire to Dark Blue wire between cruise control functional switches and cruise control module assembly.
  36. Using a test light connected to ground, backprobe between cruise control release switch connector (harness side) terminal "B" (Pink wire). See WIRING DIAGRAMS  . If test light illuminates, go to step 38). If test light does not illuminate, go to next step.
  37. Repair poor connection or open in Pink wire between fuse block and cruise control release switch.
  38. Check for a poor connection or open in Brown wire between cruise control release switch and cruise control module assembly. See WIRING DIAGRAMS  . If Brown wire is faulty, go to next step. If Brown wire is okay, go to step 40).
  39. Repair poor connection or open in Brown wire between cruise control release switch and cruise control module assembly.
  40. Check cruise control release switch for proper adjustment. See CRUISE CONTROL RELEASE SWITCH & BRAKE SWITCH ADJUSTMENT  . If cruise control release switch is properly adjusted, go to next step. If cruise control release switch is not properly adjusted, go to step 42).
  41. Replace cruise control release switch. See procedures in CRUISE CONTROL RELEASE SWITCH & BRAKE SWITCH  .
  42. Adjust cruise control release switch. See procedures in CRUISE CONTROL RELEASE SWITCH & BRAKE SWITCH ADJUSTMENT  .
  43. Check for a short to voltage in Dark Blue wire between cruise control functional switches and cruise control module assembly. See WIRING DIAGRAMS  . If Dark Blue wire is faulty, go to next step. If Dark Blue wire is okay, go to step 27).
  44. Repair short to voltage in Dark Blue wire between cruise control functional switches and cruise control module assembly.
  45. Check for a short to voltage in Gray/Black wire between cruise control functional switches and cruise control module assembly. See WIRING DIAGRAMS  . If Gray/Black wire is faulty, go to next step. If Gray/Black wire is okay, go to step 27).
  46. Repair short to voltage in Gray/Black wire between cruise control functional switches and cruise control module assembly.
  47. Check for a poor connection or open in Dark Green wire (vehicle speed signal circuit) between cruise control module assembly and Powertrain Control Module (PCM). See WIRING DIAGRAMS  . If Dark Green wire is faulty, go to next step. If Dark Green wire is okay, go to step 19).
  48. Repair poor connection or open in Dark Green wire (vehicle speed signal circuit) between cruise control module assembly and Powertrain Control Module (PCM).
  49. Using scan tool, monitor the following parameters:
    • Vehicle speed sensor should be 25-100 MPH.
    • Trans range should be 2nd, 3rd or 4th gear.
    • System voltage should be 9-17 volts.
    • Engine speed should be 500-5400 RPM.

    If listed parameters are within range, go to step 19). If above parameters are not within range, go to next step.

  50. Perform POWERTRAIN ON-BOARD DIAGNOSTIC (OBD) SYSTEM CHECK. See TESTS W/CODES article in ENGINE PERFORMANCE section.
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