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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 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) 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, repair open in Black wire between cruise control module assembly and ground connection.
  3. Connect a test light between cruise control module assembly connector (harness side) terminal "A" (Gray wire) and ground. See WIRING DIAGRAMS . Turn cruise control switch to ON position. If test light illuminates, go to step 5). If test light does not illuminate, go to next step.
  4. Using a DVOM, check for continuity in Gray wire between multifunction lever (cruise control switch) and cruise control module assembly. See WIRING DIAGRAMS . If continuity exists, replace multifunction lever (cruise control switch). See STEERING COLUMN SWITCHES article. If continuity does not exist, repair open in Gray wire between multifunction lever (cruise control switch) and cruise control module assembly.
  5. Connect a test light between cruise control module assembly connector (harness side) terminal "B" (Dark Blue wire) and ground. See WIRING DIAGRAMS . While observing test light, press and hold cruise control switch in SET position. If test light illuminates, go to step 7). If test light does not illuminate, go to next step.
  6. Using a DVOM, check for continuity in Dark Blue wire between multifunction lever (cruise control switch) and cruise control module assembly. See WIRING DIAGRAMS . If continuity exists, replace multifunction lever (cruise control switch). See STEERING COLUMN SWITCHES article. If continuity does not exist, repair open in Dark Blue wire between multifunction lever (cruise control switch) and cruise control module assembly.
  7. Connect a test light between cruise control module assembly connector (harness side) terminal "C" (Gray/Black wire) and ground. See WIRING DIAGRAMS . While observing test light, press and hold cruise control switch in R/A position. If test light illuminates, go to step 9). If test light does not illuminate, go to next step.
  8. Using a DVOM, check for continuity in Gray/Black wire between multifunction lever (cruise control switch) and cruise control module assembly. See WIRING DIAGRAMS . If continuity exists, replace multifunction lever (cruise control switch). See STEERING COLUMN SWITCHES article. If continuity does not exist, repair open in Gray/Black wire between multifunction lever (cruise control switch) and cruise control module assembly.
  9. Disconnect TCC/brake switch connector. Connect a test light between TCC/brake switch connector (harness side) terminal "B" (Orange wire) and ground. See WIRING DIAGRAMS . If test light illuminates, go to next step. If test light does not illuminate, repair open in Orange wire between instrument panel fuse block and TCC/brake switch.
  10. Connect a test light between TCC/brake switch connector (harness side) terminal "D" (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 TCC/brake switch.
  11. Ensure brakes are not applied. Using a DVOM, check for continuity between TCC/brake switch connector (harness side) terminals "C" (Purple wire) and "D" (Brown wire). See WIRING DIAGRAMS . If continuity exists, go to next step. If continuity does not exist, replace TCC/brake switch. See BRAKE & CLUTCH RELEASE SWITCHES .
  12. Apply brakes. Using a DVOM, check for continuity between TCC/brake switch connector (harness side) terminals "C" (Purple wire) and "D" (Brown wire). See WIRING DIAGRAMS . If continuity does not exist, go to next step. If continuity exists, replace TCC/brake switch. See BRAKE & CLUTCH RELEASE SWITCHES .
  13. Ensure brakes are not applied. Using a DVOM, check for continuity between TCC/brake switch connector (harness side) terminals "A" (White wire) and "B" (Orange wire). See WIRING DIAGRAMS . If continuity does not exist, go to next step. If continuity exists, replace TCC/brake switch. See BRAKE & CLUTCH RELEASE SWITCHES .
  14. Apply brakes. Using a DVOM, check for continuity between TCC/brake switch connector (harness side) terminals "A" (White wire) and "B" (Orange wire). See WIRING DIAGRAMS . If continuity exists, go to next step. If continuity does not exist, replace TCC/brake switch. See BRAKE & CLUTCH RELEASE SWITCHES .
  15. Using a DVOM, check for continuity in White wire between TCC/brake switch and cruise control module assembly. See WIRING DIAGRAMS . If continuity exists, go to next step. If continuity does not exist, repair open in White wire between TCC/brake switch and cruise control module assembly.
  16. Using a DVOM, measure resistance of White wire between TCC/brake switch and CHMSL resistor (located behind left kick panel). See WIRING DIAGRAMS . If resistance is 460-560 ohms, go to next step. If resistance is less than 460 ohms, repair short to ground in White wire between TCC/brake switch, cruise control module assembly and CHMSL resistor. If resistance is more than 560 ohms, check for an open in Black wire between CHMSL resistor and ground connection. If Black wire is okay, replace CHMSL resistor (located behind left kick panel).
  17. Using a DVOM, check for continuity in Purple wire between TCC/brake switch and cruise control module assembly. See WIRING DIAGRAMS . If continuity exists, go to next step. If continuity does not exist, repair open in Purple wire between TCC/brake switch and cruise control module assembly.
  18. Using a DVOM, check for continuity in Purple wire between TCC/brake switch and VCM 24-pin connector C4 (Black), terminal No. 10. See WIRING DIAGRAMS . If continuity exists, go to next step. If continuity does not exist, repair open in Purple wire between TCC/brake switch and VCM.
  19. Using a DVOM, check for continuity in Light Blue/Black wire between cruise control module assembly and VCM 24-pin connector C4 (Black), terminal No. 24. See WIRING DIAGRAMS . If continuity exists, go to next step. If continuity does not exist, repair open in Light Blue/Black wire between cruise control module assembly and VCM.
  20. Using a DVOM, check for continuity in Dark Green/White wire between cruise control module assembly and VCM 24-pin connector C4 (Black), terminal No. 3. See WIRING DIAGRAMS . If continuity exists, go to next step. If continuity does not exist, repair open in Dark Green/White wire between cruise control module assembly and VCM.
  21. Check if Malfunction Indicator Light (MIL) is illuminated and/or if a VSS Diagnostic Trouble Code (DTC) is set. If MIL is illuminated or a VSS DTC is set, see TESTS W/CODES article in ENGINE PERFORMANCE section. If MIL is not illuminated and no VSS DTC is set, replace cruise control module assembly. See CRUISE CONTROL MODULE ASSEMBLY .
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