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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 Brown wire between fuse block and cruise control module assembly. See WIRING DIAGRAMS  . Replace CRUISE fuse (10-amp).
  5. Check RADIO 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 7).
  6. Repair short to ground in Yellow wire between fuse block and cruise control main switch. See WIRING DIAGRAMS  . Replace RADIO fuse (10-amp).
  7. Turn cruise control main 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" (Brown wire). See WIRING DIAGRAMS  . If test light illuminates, go to next step. If test light does not illuminate, go to step 20).
  8. Using a test light, probe between cruise control module assembly connector (harness side) terminals "F" (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 21).
  9. Turn cruise control main 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).
  10. Press and hold cruise control switch in COAST/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 27).
  11. Press and hold cruise control switch in RES/ACCEL 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 next step. If test light does not illuminate, go to step 32).
  12. 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 34).
  13. Set parking brake. Raise drive wheels. Using a DVOM, measure voltage between cruise control module assembly connector (harness side) terminal "K" (Dark Green/White 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 40).
  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). Using scan tool, command SMCC to ALLOW cruise. 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 43). 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) terminals "F" (Brown wire) and "H" (Dark Green wire). 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 Brown 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 connected to ground, backprobe cruise control main switch connector (harness side) terminal "D" (Yellow wire). See WIRING DIAGRAMS  . If test light illuminates, go to next step. If test light does not illuminate, go to step 24).
  23. Using a test light connected to ground, backprobe cruise control main switch connector (harness side) terminal "A" (Gray wire). See WIRING DIAGRAMS  . If test light illuminates, go to step 25). If test light does not illuminate, go to step 26).
  24. Repair poor connection or open in Yellow wire between fuse block and cruise control main switch.
  25. Repair poor connection or open in Gray wire between cruise control main switch, cruise control functional switches and cruise control module assembly.
  26. Replace cruise control main switch. See CRUISE CONTROL MAIN SWITCH  under REMOVAL & INSTALLATION.
  27. Check for a poor connection or open in Dark Blue wire between cruise control module assembly and cruise control functional switches. See WIRING DIAGRAMS  . If Dark Blue wire is faulty, go to next step. If Dark Blue wire is okay, go to step 29).
  28. Repair poor connection or open in Dark Blue wire between cruise control module assembly and cruise control functional switches.
  29. Check for a poor connection or open in Gray wire between cruise control main switch, 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 31).
  30. Repair poor connection or open in Gray wire between cruise control main switch, cruise control functional switches and cruise control module assembly.
  31. Replace cruise control functional switches. See procedures in CRUISE CONTROL FUNCTIONAL SWITCHES  .
  32. Check for a poor connection or open 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 31).
  33. Repair poor connection or open in Gray/Black wire between cruise control functional switches and cruise control module assembly.
  34. Using a test light, backprobe between cruise control release switch connector (harness side) terminal "A" (Brown wire) and cruise control module assembly connector (harness side) terminal "E" (Black wire). See WIRING DIAGRAMS  . If test light illuminates, go to next step. If test light does not illuminate, go to step 36).
  35. Repair poor connection or open in Brown wire between cruise control release switch and cruise control module assembly.
  36. Using a test light, backprobe between cruise control release switch connector (harness side) terminal "B" (Brown/White wire) and cruise control module assembly connector (harness side) terminal "E" (Black wire). See WIRING DIAGRAMS  . If test light illuminates, go to next step. If test light does not illuminate, go to step 38).
  37. Replace cruise control release switch. See CRUISE CONTROL RELEASE SWITCH & BRAKE SWITCH  .
  38. Check for a poor connection or open in Brown/White wire between cruise control release switch and cruise control functional switches. See WIRING DIAGRAMS  . If Brown/White wire is faulty, go to next step. If Brown/White wire is okay, go to step 31).
  39. Repair poor connection or open in Brown/White wire between cruise control release switch and cruise control functional switches.
  40. Check for a poor connection or open in Dark Green/White wire between cruise control module assembly and Powertain Control Module (PCM). See WIRING DIAGRAMS  . If Dark Green/White wire is faulty, go to next step. If Dark Green/White wire is okay, go to step 42).
  41. Repair poor connection or open in Dark Green/White wire between cruise control module assembly and Powertrain Control Module (PCM).
  42. Check PCM. See TESTS W/CODES article in ENGINE PERFORMANCE section.
  43. 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 42). If above parameters are not within range, go to next step.

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