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Circuit/System Testing

  1. Ignition ON, verify that the Stop Lamp Pedal Switch parameter in the ECM reads Released while depressing the brake pedal.
    • If the Stop Lamp Pedal Switch parameter reads Applied, replace the ECM.
  2. Ignition OFF, test the stop lamp switch signal circuit for an open/high resistance, a short to ground or a short to voltage. If the circuit tests normal, replace the BCM.
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