lexus es300 power transistor circuitThe 2003 Lexus ES300 control assembly controls the blower speed by varying the voltage at terminal BLW which applies the base current to the . The control assembly also monitors the collector voltage at terminal, VM to control blower air volume precisely. The following schematic shows the 2003 Lexus ES300 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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