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Stoplight Switch Circuit

  1. Check stoplight operation. If stoplight operation is okay, go to next step. If stoplights do not operate correctly, repair stoplights as necessary. See WIRING DIAGRAMS in EXTERIOR LIGHTS article.
  2. Perform CANCEL SWITCHES  test under CRUISE CONTROL FUNCTION TEST under TROUBLE SHOOTING. If stoplight input signal is not as specified, go to next step. If stoplight input signal is as specified, no problem is indicated at this time. Fault may be intermittent. If sent here from SYMPTOM TESTS, perform next test listed.
  3. Remove cruise control ECU with connector attached. See Figure. Turn ignition switch to ON position. Backprobing cruise control ECU connector, measure voltage between ground and cruise control ECU connector terminal No. 2 (Green/White wire). With brake pedal depressed, battery voltage should exist. With brake pedal released, voltage should be less than one volt. 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 TESTS, perform next test listed.
  4. Check for open circuit in wiring harness and connectors between cruise control ECU and stoplight switch. Repair as necessary and retest system. If wiring harness and connectors are okay, replace cruise control ECU and retest system.
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