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Test 7, Stoplight Switch Circuit

  1. Check stoplight operation. If stoplight operation is okay, go to next step. If stoplights do not operate correctly, check STOP fuse and replace if necessary. If fuse is okay, go to next step.
  2. Perform CANCEL SWITCHES test under CRUISE CONTROL CIRCUIT FUNCTION TEST  under TROUBLE SHOOTING. If stoplight input signal is as specified, go to next trouble code displayed or appropriate TROUBLE SHOOTING BY SYMPTOM . If input signal is not as specified, remove CC ECU with connectors connected. Turn ignition on.
  3. Using voltmeter positive lead, backprobe CC ECU connector terminal No. 16/STP- (Green/White wire) and ensure battery voltage exists between CC ECU connector and ground with brake pedal depressed. Ensure less than one volt exists between terminal No. 16/STP- (Green/White wire) and ground with brake pedal released. If voltage is as specified, go to test for next trouble code displayed or appropriate TROUBLE SHOOTING BY SYMPTOM . If voltage is not as specified, go to next step.
  4. Check for open in harness and connectors between CC ECU and stoplight switch. Repair or replace as necessary. If harness and connectors are okay, replace CC ECU and retest system.
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