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Power Transistor Test

  1. Disconnect the 5P connector from the power transistor.
  2. Measure the resistance between the No. 1 and No. 4 terminals of the power transistor. 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.
    Fig 1: Measuring The Resistance Between The No. 1 & No. 4 Terminals Of The Power Transistor
    G01465709Courtesy of AMERICAN HONDA MOTOR CO., INC.
  3. Carefully release the lock tab on the No. 3 terminal (ORN/BLK) (A) in the 5P connector, then remove the terminal and insulate it from body ground.
    Fig 2: Insulating No. 3 Terminal Of the Power Transistor 5P Connector
    G01465710Courtesy of AMERICAN HONDA MOTOR CO., INC.
  4. Reconnect the 5P connector to the power transistor.
  5. Supply 12 volts to the No. 3 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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