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Power Transistor Test

  1. Disconnect the 4P connector from the power transistor.
  2. Measure the resistance between the No. 1 and No. 3 terminals of the power transistor. It should be about 1.5 kohm;.
    • If the resistance is within the specifications, go to step  4.
    • If the resistance is not within the specifications, replace the power transistor.
      Fig 1: Measuring The Resistance Between The No. 1 And No. 3 Terminals Of The Power Transistor
      G03690856Courtesy of AMERICAN HONDA MOTOR CO., INC.
  3. Carefully release the lock tab on the No. 2 terminal (BLU/YEL) (A) in the 4P connector, then remove the terminal and insulate it from body ground.
    Fig 2: Releasing Lock Tab On The No. 2 Terminal (BLU/YEL) In The 4P Connector
    G03690857Courtesy of AMERICAN HONDA MOTOR CO., INC.
  4. Reconnect the 4P connector to the power transistor.
  5. Make sure the BLU/YEL wire is completely isolated, then supply 12 V to the No. 2 cavity with a jumper wire.
  6. 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.
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