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Cruise Control Is 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. Disconnect cruise control module assembly connector. Turn ignition switch to RUN position. Connect a test light between cruise control module assembly connector (harness side) terminal "F" (Brown wire) and ground. See WIRING DIAGRAMS  . If test light illuminates, go to next step. If test light does not illuminate, repair open in Brown wire between instrument panel fuse block and cruise control module assembly.
  2. Connect a test light between cruise control module assembly connector (harness side) terminal "E" (Black/White wire) and ground. See WIRING DIAGRAMS  . If test light illuminates, go to next step. If test light does not illuminate, repair open in Black/White wire between cruise control module assembly and ground connection.
  3. Turn cruise control switch to ON position. Connect a test light between cruise control module assembly connector (harness side) terminal "A" (Gray wire) and ground. See WIRING DIAGRAMS  . If test light does not illuminate, go to next step. If test light illuminates, go to step 6).
  4. Disconnect multifunction lever (cruise control switch) connector. Connect a test light between multifunction lever (cruise control switch) connector (harness side) terminal A13 (Brown wire) and ground. See WIRING DIAGRAMS  . If test light illuminates, go to next step. If test light does not illuminate, repair open in Brown wire between instrument panel fuse block and multifunction lever (cruise control switch).
  5. Connect a test light between multifunction lever (cruise control switch) connector (pigtail side) terminals A13 (Brown wire) and A12 (Gray wire). See WIRING DIAGRAMS  . If test light illuminates, repair open in Gray wire between multifunction lever (cruise control switch) and cruise control module assembly. If test light does not illuminate, repair open in Brown wire or Gray wire of multifunction lever (cruise control switch) pigtail. If Brown wire and Gray wire are okay, replace multifunction lever (cruise control switch). See STEERING COLUMN SWITCHES article.
  6. Turn cruise control switch to OFF position. Connect a test light between cruise control module assembly connector (harness side) terminal "B" (Dark Blue wire) and ground. See WIRING DIAGRAMS  . If test light does not illuminate, go to next step. If test light illuminates, repair short to voltage in Dark Blue wire between multifunction lever (cruise control switch) and cruise control module assembly.
  7. Turn cruise control switch to ON position. Connect a test light between cruise control module assembly connector (harness side) terminal "B" (Dark Blue wire) and ground. See WIRING DIAGRAMS  . Press and hold cruise control switch in SET position. If test light does not illuminate, go to next step. If test light illuminates, go to step 9).
  8. Disconnect multifunction lever (cruise control switch) connector. Connect a test light between multifunction lever (cruise control switch) connector (harness side) terminal A14 (Dark Blue wire) and cruise control module assembly connector (harness side) terminal "B" (Dark Blue wire). See WIRING DIAGRAMS  . If test light illuminates, repair open in Dark Blue wire of multifunction lever (cruise control switch) pigtail. If Dark Blue wire is okay, replace multifunction lever (cruise control switch). See STEERING COLUMN SWITCHES article. If test light does not illuminate, repair open in Dark Blue wire between multifunction lever (cruise control switch) and cruise control module assembly.
  9. Connect a test light between cruise control module assembly connector (harness side) terminal "G" (White wire) and ground. See WIRING DIAGRAMS  . If test light illuminates, go to next step. If test light does not illuminate, go to step 11).
  10. Disconnect TCC/brake switch connector. Connect a test light between TCC/brake switch terminals "E" (Orange wire) and "F" (White wire). See WIRING DIAGRAMS  . If test light illuminates, replace TCC/brake switch. See BRAKE & CLUTCH RELEASE SWITCHES  . If test light does not illuminate, repair short to voltage in White wire between TCC/brake switch and cruise control module assembly.
  11. Connect a test light between cruise control module assembly connector (harness side) terminal "G" (White wire) and ground. See WIRING DIAGRAMS  . Apply brake pedal. If test light illuminates, go to step 13). If test light does not illuminate, go to next step.
  12. Disconnect TCC/brake switch connector. Connect a test light between TCC/brake switch connector (harness side) terminal "F" (White wire) and cruise control module assembly connector (harness side) terminal "G" (White wire). See WIRING DIAGRAMS  . If test light illuminates, replace TCC/brake switch. See BRAKE & CLUTCH RELEASE SWITCHES  . If test light does not illuminate, repair open in White wire between TCC/brake switch and cruise control module assembly.
  13. Connect a test light between cruise control module assembly connector (harness side) terminal "D" (Purple wire) and ground. See WIRING DIAGRAMS  . If test light does not illuminate, go to next step. If test light illuminates, go to step 16).
  14. Disconnect TCC/brake switch connector. Connect a test light between TCC/brake switch terminals "D" (Brown wire) and "C" (Purple wire). See WIRING DIAGRAMS  . If test light illuminates, go to next step. If test light does not illuminate, replace TCC/brake switch. See BRAKE & CLUTCH RELEASE SWITCHES  .
  15. Connect a test light between TCC/brake switch connector (harness side) terminal "D" (Brown wire) and ground. See WIRING DIAGRAMS  . If test light illuminates, repair open in Purple wire between TCC/brake switch and cruise control module assembly. If test light does not illuminate, repair open in Brown wire between TCC/brake switch and instrument panel fuse block. Also check for Diagnostic Trouble Codes (DTCs) related to Anti-Lock Brake System (ABS).
  16. Using a DVOM, measure voltage between cruise control module assembly connector (harness side) terminal "K" (Dark Green/White wire) and ground. See WIRING DIAGRAMS  . If voltage is present, go to next step. If voltage is not present, go to step 18).
  17. Disconnect VCM 24-pin connector C4 (Black). Using a DVOM, measure voltage between cruise control module assembly connector (harness side) terminal "K" (Dark Green/White wire) and ground. See WIRING DIAGRAMS  . If battery voltage is present, repair short to voltage in Dark Green/White wire between cruise control module assembly and VCM. If voltage is not present, replace VCM.
  18. Disconnect VCM 24-pin connector C4 (Black). Connect a test light between cruise control module assembly connector (harness side) terminal "K" (Dark Green/White wire) and VCM 24-pin connector C4 (harness side) terminal No. 3 (Dark Green/White wire). See WIRING DIAGRAMS  . If test light illuminates, go to next step. If test light does not illuminate, repair open in Dark Green/White wire between cruise control module assembly and VCM.
  19. Connect a test light between cruise control module assembly connector (harness side) terminal "K" (Dark Green/White wire) and ground. See WIRING DIAGRAMS  . If test light does not illuminate, go to next step. If test light illuminates, repair short to ground in Dark Green/White wire between cruise control module assembly and VCM.
  20. Reconnect VCM 24-pin connector C4 (Black). Leave cruise control module assembly disconnected. Using a DVOM, measure voltage between cruise control module assembly connector (harness side) terminal "K" (Dark Green/White wire) and ground. See WIRING DIAGRAMS  . Ensure radio is off. Operate vehicle while observing voltage. If voltage indicates up to 5 volts as vehicle speed increases, go to next step. If voltage does not respond with increase in vehicle speed, go to step 22).
  21. Continue to operate vehicle. Turn radio on. Observe voltage. If voltage indicates up to 5 volts as vehicle speed increases, replace cruise control module assembly. See procedures in CRUISE CONTROL MODULE ASSEMBLY  . If no voltage is present, replace radio.
  22. Turn ignition switch to OFF position. Disconnect VCM 24-pin connector C4 (Black). Connect a test light between cruise control module assembly connector (harness side) terminal "J" (Light Blue/Black wire) and ground. See WIRING DIAGRAMS  . If test light does not illuminate, go to next step. If test light illuminates, repair short to ground in Light Blue/Black wire between cruise control module assembly and VCM.
  23. Turn ignition switch to ON position. Turn cruise control switch to ON position. Using a DVOM, measure voltage between VCM 24-pin connector C4 (harness side) terminal No. 3 (Dark Green/White wire) and ground. See WIRING DIAGRAMS  . If voltage is greater than 4.5 volts, check for poor connections at VCM. If connections are okay, replace VCM. If voltage is less than 4.5 volts, check for poor connections at cruise control module assembly. If connections are okay, replace cruise control module assembly. See CRUISE CONTROL MODULE ASSEMBLY  .
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