•  Controls the supply voltage to the rear blower motor according to the gate voltage sent from the front climate control unit and adjusts the rotation speed (airflow volume).

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•  There are four electrodes: source, gate, drain and feedback electrodes.

•  The resistance between terminals B and A (between drain and source) changes according to the voltage (gate voltage) applied to terminal C (gate).

•  When the gate voltage increases, the resistance between terminals B and A decreases, allowing the current to flow easily.