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DTC 49: Stoplight Switch: Testing

  1. Depress brake pedal. Check stoplight operation. If stoplight bulbs illuminate, go to next step. Replace stoplight bulb if necessary.
  2. Remove ABS ECU with connectors still connected. Depress brake pedal. Check voltage by backprobing Green/White wire at ECU connector A18 terminal No. 12 (Non-Turbo) or connector A20 terminal No. 5 (Turbo). If voltage is not 10-14 volts, go to next step. If voltage is 10-14 volts, go to next operation or procedure under symptom diagnosis.
  3. Check for open in Green/White wire between stoplight switch terminal No. 1 and ECU connector A18 terminal No. 12 (Non-Turbo) or connector A20 terminal No. 5 (Turbo). See appropriate wiring diagram under WIRING DIAGRAM . Repair wiring if necessary. If no problems are found, perform appropriate ECU pin voltage test under PIN VOLTAGE .
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