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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, check and repair stoplight system 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 DIAGNOSIS, perform next test listed.
  3. Remove ECM with connector attached. See Figure. Turn ignition switch to ON position. Measure voltage (backprobe) between ground and terminal No. 20 (Green/White wire) of ECM 22-pin harness connector E14. See Figure. 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 DIAGNOSIS, perform next test listed.
  4. Check for open circuit in wiring harness and connectors between ECM and stoplight switch. Repair as necessary and retest system. If wiring harness and connectors are okay, replace ECM and retest system.
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