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)

Related Post

Cadillac Concours Window Defogger Circuit and Wiring Diagram
20W Car Radio Power Amplifier using TDA2005
MSD Briggs & Stratton | Tecumseh Ignition System Wiring Diagram
2001 Toyota Sequoia Ignition Coil Schematic Diagram
2013 BMW 5 Series (F10) 528i Oil Supply Hydraulic Circuit Diagram