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Power Transistor Test

  1. Disconnect the 5P connector from the power transistor.
  2. Measure the resistance between terminal No. 1 and No. 4 of the power transistor. It should be about 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.
    NOTE: Also check the blower motor. Power transistor failure can be caused by a defective blower motor.
    Fig 1: Measuring Resistance Between Terminal No. 1 And No. 4 Of Power Transistor
    G05968433Courtesy of AMERICAN HONDA MOTOR CO., INC.
  3. Carefully release the lock tab on terminal No. 3 (BLU/YEL) (A) in the 5P connector, then remove the terminal and insulate it from body ground.
    Fig 2: Identifying Power Source On Vehicle
    G05968434Courtesy of AMERICAN HONDA MOTOR CO., INC.
  4. Reconnect the 5P connector to the power transistor.
  5. Make sure the BLU/YEL wire is completely isolated, then supply 12 V to the No. 3 cavity with a jumper wire.
  6. 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.
    • If the blower motor runs, the power transistor is OK.
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