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Cruise Control Indicator Light Circuit

  1. Remove cruise control ECU with connectors connected. See Figure. Turn ignition switch to ON position. Measure voltage by backprobing between cruise control ECU C15 connector terminals No. 5 (Red/Blue wire) and No. 16 (White/Black wire). With cruise ON-OFF switch in OFF position, battery voltage should exist. With cruise ON-OFF switch in ON position, voltage should be less than 1.2 volts. If voltage is not as specified, go to next step. If voltage is as specified, no problem is indicated at this time. Fault may be intermittent. If sent here from SYMPTOM TESTING, perform next test listed.
  2. Check instrument cluster. See appropriate INSTRUMENT PANELS article. Repair as necessary. If instrument cluster is okay, replace cruise control ECU and retest system.
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