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Power Transistor Test

  1. Disconnect the 4P connector from the power transistor.
  2. Measure the resistance between power transistor terminals No. 3 and No, 4. 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.
      NOTE: Also check the blower motor. Power transistor failure can be caused by a defective blower motor.
      Fig 1: Measuring Resistance Between Power Transistor Terminals No. 3 And No. 4
      G06680525Courtesy of AMERICAN HONDA MOTOR CO., INC.
  3. Carefully release the lock tab on terminal No. 1 (BLU/YEL) (A) in the 4P connector, then remove the terminal and insulate it from body ground.
    Fig 2: Identifying 4P Connector Terminal Lock Tab
    G06680526Courtesy of AMERICAN HONDA MOTOR CO., INC.
  4. Reconnect the 4P connector to the power transistor.
  5. Supply 12 V to cavity No. 1 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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