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Test SC-7A - Repairing Cruise Control Set Switch Circuit

NOTE: For connector terminal identification, refer to CONNECTOR IDENTIFICATION  . For appropriate wiring diagram, see appropriate chassis wiring diagram in the WIRING DIAGRAMS section.
  1. Turn ignition switch to OFF position. On XJ models go to step 6).On ZJ models, disconnect PCM module. Inspect connector and clean and repair as needed. Turn ignition on. Ensure cruise control switch is in ON position. Using DRB-II in voltmeter mode, backprobe (with connector connected) cruise control set switch sense circuit voltage at terminal No. 4 (Brown/Red wire) of switch connector.
  2. If voltage is less than 10 volts, replace cruise control switch. Perform TEST SC-VER  . If voltage is more than 10 volts, backprobe (with connector connected) cruise control set switch sense circuit at terminal No. 4 (Brown/Red wire) of clockspring connector using DRB-II in voltmeter mode. See Figure in TEST SC-2A.
  3. If voltage is less than 10 volts, replace clockspring assembly. Perform TEST SC-VER  . If voltage is more than 10 volts, check cruise control set switch sense circuit voltage at terminal No. 48 (Brown/Red wire) of PCM connector.
  4. If voltage is less than 10 volts, repair open cruise control set switch sense circuit between switch and PCM. If voltage is more than 10 volts, hold set switch in ON position.
  5. Check cruise control set switch sense circuit voltage at terminal No. 48 (Brown/Red wire) of PCM connector. If voltage is more than 10 volts, replace cruise control switch. Perform TEST SC-VER  . If voltage measures less than 10 volts, replace the PCM module. Perform TEST SC-VER  .
  6. Disconnect PCM module. Inspect connector and clean and repair as needed. Turn ignition on. Using DRB-II in voltmeter mode, check cruise control set switch sense circuit voltage at terminal No. 48 (Brown/Red wire) of PCM connector. If voltage is more than 10 volts, replace cruise control switch. Perform TEST SC-VER  .
  7. If voltage is less than 10 volts, hold set switch button in ON position. Backprobe (with connector connected) cruise control set switch sense circuit voltage at terminal No. 3 (Brown/Red wire) of cruise control switch connector. If voltage is less than 10 volts, replace cruise control switch. Perform TEST SC-VER  .
  8. If voltage is more than 10 volts, check cruise control set switch sense circuit voltage at terminal No. 48 (Brown/Red wire) of PCM connector. Continue to hold down set switch button. If voltage is less than 10 volts, repair open cruise control set switch sense circuit between switch and PCM. Perform TEST SC-VER  . If voltage is more than 10 volts, replace PCM module. Perform TEST SC-VER  .
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