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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 DIAGNOSIS, perform next test listed.
  3. Remove cruise control ECU with harness connector attached. Turn ignition on. Using DVOM connected to chassis ground, backprobe cruise control ECU connector terminal No. 6 (Green/White wire). See WIRING DIAGRAMS . With brake pedal depressed, battery voltage should exist. With brake pedal released, voltage should be less than one volt. If voltage reading is not as specified, go to next step. If voltage reading 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 cruise control ECU and stoplight switch. See WIRING DIAGRAMS . Repair as necessary and retest system. If wiring harness and connectors are okay, replace cruise control ECU and retest system.
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