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Home >> Lexus >> 1992 >> ES 300 V6-3.0L (3VZ-FE) >> Repair and Diagnosis >> Heating and Air Conditioning >> Testing and Inspection >> Component Tests and General Diagnostics >> Power Transistor Circuit

Power Transistor Circuit

Power Transistor Circuit
The 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.

Diagnostic Chart:




Wiring Diagram:






Inspection Procedure - Step 1:




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