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Cruise Indicator Light Circuit

  1. Turn ignition on. Measure voltage (backprobe) between cruise control ECU connector terminal No. 4 and ground. See Figure. With main cruise control switch button released, voltage should be 10-14 volts. With main cruise control switch button pressed, voltage should be less than 1.2 volts. If voltage is not as specified, go to next step. If voltage is as specified, perform next procedure listed in SYMPTOM DIAGNOSIS  table under TROUBLE SHOOTING.
  2. Check instrument cluster. See appropriate INSTRUMENT PANELS article. Replace instrument cluster as necessary. If instrument cluster is okay, check cruise control ECU. See CRUISE CONTROL ECU PIN VOLTAGE TESTS  under COMPONENT TESTS. If cruise control ECU is defective, replace ECU.
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