Blower Power Transistor Test

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

1. Measure the resistance between the No. 3 and No. 4 terminals of the power transistor. It should be about 1.4−1.5 kΩ.
   - If the resistance is within the specifications, go to Step 3 .
   - If the resistance is not within the specifications, replace the power transistor.

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

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

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

1. 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.