Blower Power Transistor Test

Blower Power Transistor Test

1.Disconnect the 4P connector from the power transistor.

2.Measure the resistance between the No. 3 and No. 4 terminals of the power transistor. It should be about 1.4-1.5 kW.

  • If the resistance is within the specifications, go to 3.
  • If the resistance is not within the specifications, replace the power transistor.


3.Carefully release the lock tab on the No. 1 terminal (BLU/YEL) (A) in the 4P connector, then remove the terminal and insulate it from body ground.


4.Reconnect the 4P connector to the power transistor.

5.Supply 12 volts to the No. 1 cavity with a jumper wire.

6.Turn the ignition switch ON (II), and check that the blower motor runs.

  • If the blower motor does not run, replace the power transistor.
  • If the blower motor runs, the power transistor is OK.