Power Transistor Test

WARNING: This page is about a different car, the 2009 Honda S2000 and 2008 Honda S2000. However, it is still accessible from the selected car via links, so may be relevant.

Disconnect the 5P connector from the power transistor.
Measure the resistance between the No. 1 and No. 4 terminals of the power transistor. It should be about 1.4-1.5 kΩ.
NOTE: Also check the blower motor. Power transistor failure can be caused by a defective blower motor.
- If the resistance is within the specifications, go to step 3.
- If the resistance is not within the specifications, replace the power transistor.
Fig 1: Measuring Resistance Between Terminals Of Power Transistor
Courtesy of AMERICAN HONDA MOTOR CO., INC.
Carefully release the lock tab on the No. 3 terminal (BLU/YEL) (A) in the 5P connector, then remove the terminal and insulate it from body ground.

Fig 2: Removing Terminal And Body Ground
Courtesy of AMERICAN HONDA MOTOR CO., INC.
Reconnect the 5P connector to the power transistor.
Supply 12 V to the No. 3 cavity with a jumper wire.
Turn the ignition switch to ON (II), and check that the blower motor runs.
- If the blower motor does not run, replace the power transistor.
  NOTE: A faulty blower motor can cause the power transistor to fail. If the power transistor is replaced, also check the blower motor for binding, and replace it if necessary.
- If the blower motor runs, the power transistor is OK.