lexus es300 power transistor circuitThe 2003 Lexus ES300 air conditioning control assembly controls the blower speed by varying the voltage at terminal BLW which applies the base current to the power transistor. The air conditioning control assembly also monitors the power transistor collector voltage at terminal, VM to control blower air volume precisely. The following schematic shows the 2003 Lexus ES300 Power Transistor circuit and wiring diagram. The system composed of heater main relay, blower motor, extra-hi relay, lo resistor, A/C control assembly. (click image to enlarge)

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