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Control Circuit

  1. Turn ignition on. Check voltage between fuse No. 18 and ground. If 10-13 volts is indicated, go to next step. If 10-13 is not indicated, check wiring and repair or replace as necessary. See WIRING DIAGRAMS  . Replace fuse No. 18 and recheck voltage.
  2. Turn ignition switch to OFF position. Remove cruise control main switch and disconnect harness connector. See CRUISE CONTROL MAIN SWITCH  under REMOVAL & INSTALLATION. Turn ignition switch to ON position. Using DVOM. measure voltage between ground and main switch harness connector terminal No. 3. See Figure . If 10 volts or greater is indicated, go to next step. If less than 10 volts is indicated, replace cruise control main switch.
  3. Turn cruise control main switch to ON position. Measure resistance between cruise control main switch terminals No. 3 and 5. If resistance is 10 ohms or less, go to next step. If resistance is greater than 10 ohms, replace cruise control main switch.
  4. Turn cruise control main switch to OFF position. Measure resistance between cruise control main switch terminals No. 3 and 5. If resistance is less than one megohm, go to next step. If resistance is one megohm or greater, replace cruise control main switch.
  5. Reconnect harness connector. Turn ignition and cruise control main switches to ON position. Using DVOM, backprobe cruise control main switch harness connector terminal No. 3. If 10 volts or greater is indicated, go to next step. If less than 10 volts is indicated, repair or replace harness as necessary. See WIRING DIAGRAMS  .
  6. Using DVOM, backprobe cruise control main switch harness connector terminal No. 5. If 10 volts or greater is indicated, go to next step. If less than 10 volts is indicated, repair or replace harness as necessary.
  7. Measure voltage between ground and cruise control module harness connector terminal No. 15. See Figure . If 10 volts or greater is indicated, replace cruise control module. If less than 10 volts is indicated, repair or replace harness as necessary.
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