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DTC 33: Stoplight Switch System

NOTE: DTC is set if ECU detects stoplight switch stays on for 15 minutes or more, or an open circuit in stoplight switch system.
  1. Check if stoplights are functioning correctly. If stoplights function correctly, go to next step. If stoplights do not function correctly, check and repair stoplight circuit. See WIRING DIAGRAMS  .
  2. Turn ignition off. Disconnect ECU 22-pin connector. Using DVOM, measure voltage between ECU 22-pin connector terminal No. 34 and ground while depressing brake pedal. See Figure -6. If battery voltage is present, go to next step. If battery voltage is not present, check and repair connectors and related wiring harness between stoplight switch and ECU. See WIRING DIAGRAMS  .
  3. Check and repair ECU 22-pin connector. If connector is okay, replace ECU.
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