Power Transistor Test

WARNING: This page does not describe the selected car, but rather 6 other vehicles, including the 2015 Honda Crosstour, 2014 Honda Crosstour, 2013 Honda Crosstour, 2012 Honda Crosstour, and 2011 Honda Accord Crosstour. However, it is still accessible from the selected car via links, so may be relevant.

Remove the passenger's dashboard undercover (see DRIVER'S DASHBOARD UNDERCOVER REMOVAL/INSTALLATION ).
Disconnect the 4P connector from the power transistor.
Measure the resistance between terminals No. 2 and No. 4 of the power transistor. It should be about 1.5 kΩ.
- If the resistance is within the specifications, go to step 4.
- If the resistance is not within the specifications, replace the power transistor.
  NOTE: Also check the blower motor. Power transistor failure can be caused by a defective blower motor.
  
  Fig 1: Measuring Resistance Between Terminals No. 2 And No. 4 Of Power Transistor
  Courtesy of AMERICAN HONDA MOTOR CO., INC.
Carefully release the lock tab on terminal No. 1 (PUR) (A) in the 4P connector, then remove the terminal and insulate it from body ground.

Fig 2: Locating Terminal No. 1 (PUR) In 4P Connector
Courtesy of AMERICAN HONDA MOTOR CO., INC.
Reconnect the 4P connector to the power transistor.
Make sure the PUR wire is completely isolated, then supply 12 V to cavity No. 1 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.