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Cruise Control Inoperative

WARNING: This page is about a different car, the 1998 Pontiac Grand Am, 1998 Oldsmobile Achieva, and 1998 Buick Skylark. However, it is still accessible from the selected car via links, so may be relevant.
NOTE: To avoid misdiagnosis, perform rev test and trouble shooting. See REV 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. 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 step 3). If test light does not illuminate, go to next step.
  2. Check CRUISE fuse (10-amp). Replace as necessary. If fuse is okay, repair poor connection or open in Pink wire between cruise control module assembly and fuse block.
  3. Using a test light, probe between cruise control module assembly connector (harness side) terminals "F" (Pink wire) and "E" (Black/White wire). See WIRING DIAGRAMS  . If test light illuminates, go to step 5). If test light does not illuminate, go to next step.
  4. Repair poor connection or open in Black/White wire between cruise control module assembly and ground connection.
  5. 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/White wire). See WIRING DIAGRAMS  . If test light illuminates, go to step 11). If test light does not illuminate, go to next step.
  6. 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/White wire). See WIRING DIAGRAMS  . If test light illuminates, go to next step. If test light does not illuminate, go to step 8).
  7. Check for a poor connection, open or short to ground in Gray wire between multifunction lever (cruise control switch) and cruise control module assembly. Repair as necessary. If Gray wire is okay, replace multifunction lever (cruise control switch). See STEERING COLUMN SWITCHES article.
  8. Press and hold cruise control switch in R/A position. Using a test light, probe between cruise control module assembly connector (harness side) terminals "C" (Gray/Black wire) and "E" (Black/White wire). See WIRING DIAGRAMS  . If test light illuminates, go to next step. If test light does not illuminate, go to step 10).
  9. Check Dark Blue wire for a short to Gray/Black wire, or a short to ground. Check for a poor connection at multifunction lever (cruise control switch). Repair as necessary. If Dark Blue wire and conneciton are okay, replace multifunction lever (cruise control switch). See STEERING COLUMN SWITCHES article.
  10. Check for a poor connection or open in multifunction lever (cruise control switch) wiring harness. Check for a poor connection or open in Pink wire between cruise control module assembly and fuse block. Repair as necessary. If Pink wire and connection are okay, replace multifunction lever (cruise control switch). See STEERING COLUMN SWITCHES article.
  11. 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/White wire). See WIRING DIAGRAMS  . If test light illuminates, go to step 13). If test light does not illuminate, go to next step.
  12. Check for a poor connection, open or short to ground in Dark Blue wire between multifunction lever (cruise control switch) and cruise control module assembly. Repair as necessary. If Dark Blue wire is okay, replace multifunction lever (cruise control switch). See STEERING COLUMN SWITCHES article.
  13. Press and hold cruise control switch in R/A position. Using a test light, probe between cruise control module assembly connector (harness side) terminals "C" (Gray/Black wire) and "E" (Black/White wire). See WIRING DIAGRAMS  . If test light illuminates, go to step 15). If test light does not illuminate, go to next step.
  14. Check for a poor connection, open or short to ground in Gray/Black wire between multifunction lever (cruise control switch) and cruise control module assembly. Repair as necessary. If Gray/Black wire is okay, replace multifunction lever (cruise control switch). See STEERING COLUMN SWITCHES article.
  15. Using a test light, probe between cruise control module assembly connector (harness side) terminals "D" (Brown/White wire on M/T; Purple wire on A/T) and "E" (Black/White wire). See WIRING DIAGRAMS  . If test light illuminates, go to step 21). If test light does not illuminate, go to next step.
  16. Using a test light connected to ground, backprobe cruise control release switch connector (harness side) terminal "B" (Brown wire on M/T; Purple wire on A/T). See WIRING DIAGRAMS  . If test light illuminates, go to step 18). If test light does not illuminate, go to next step.
  17. Check ALARM fuse (20-amp). Replace as necessary. If fuse is okay, check for a poor connection or open in Pink wire between cruise control release switch and fuse block. Check cruise control release switch for proper adjustment. See CRUISE CONTROL RELEASE SWITCH & BRAKE SWITCH ADJUSTMENT  . If Pink wire is okay and cruise control release switch is properly adjusted, replace cruise control release switch. See CRUISE CONTROL RELEASE SWITCH & BRAKE SWITCH  .
  18. On A/T models, repair poor connection or open in Purple wire between cruise control release switch and cruise control module assembly. On M/T models, using a test light connected to ground, backprobe cruise control clutch switch connector (harness side) terminal "B" (Brown/White wire). See WIRING DIAGRAMS  . If the test light illuminates, go to next step. If the test light does not illuminate, go to step 20).
  19. Repair poor connection or open in Brown/White wire between cruise control clutch switch and cruise control module assembly.
  20. Check for a poor connection or open in Brown wire between cruise control clutch switch and cruise control release switch. If Brown wire is okay, replace cruise control clutch switch. See procedures in CRUISE CONTROL CLUTCH SWITCH (M/T)  .
  21. Set parking brake. Raise drive wheels. Turn ignition switch to RUN position. Place transmission in Neutral and slowly rotate front wheels. 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 varies, go to step 23). If voltage does not vary, go to next step.
  22. Check for a poor connection or open in Dark Green/White wire (VSS output circuit) between cruise control module assembly and Powertrain Control Module (PCM). See appropriate TESTS W/CODES article in ENGINE PERFORMANCE section:
  23. 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). Repair as necessary. Reinstall cruise control module assembly. Connect scan tool to Data Link Connector (DLC). Start engine. Clear any Diagnostic Trouble Codes (DTCs). Using scan tool, monitor CRUISE INHIBITED display. Attempt to operate cruise control system. If scan tool displays CRUISE INHIBITED, go to next step. If scan tool does not display CRUISE INHIBITED, go to step 25).
  24. PCM is not allowing operation of cruise control system. Diagnose PCM, cruise disable output circuit, or other PCM-controlled related circuits and components affecting cruise control operation. See appropriate TESTS W/CODES article in ENGINE PERFORMANCE section:
  25. Clear any DTCs. Using scan tool, command PCM to ALLOW cruise. Using a DVOM connected to battery voltage, probe cruise control module assembly connector (harness side) terminal "H" (Dark Green wire). See WIRING DIAGRAMS  . If battery voltage is not present, go to next step. If battery voltage is present, replace cruise control module assembly. See CRUISE CONTROL MODULE ASSEMBLY  .
  26. Check for a short to voltage in Dark Green wire (cruise disable output circuit) between cruise control module assembly and Powertrain Control Module (PCM). If Dark Green wire is okay, diagnose PCM. See appropriate TESTS W/CODES article in ENGINE PERFORMANCE section:
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