Celica L4-122 1998cc 2.0L DOHC Turbo (3S-GTE) (1990)
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Power Transistor HVAC: Testing and Inspection
INSPECTION OF POWER TRANSISTOR
1. Connect the positive (+) leads from the battery to terminal 1 through a 3.4 W test bulb and terminal 3 of a 120 ohm resistor.
2. Connect the negative (-) lead from the battery to terminal 2, then check that the test bulb lights up.
If operation is not as specified, replace the power transistor.