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Front Power Transistor Test

  1. Remove the passenger's dashboard undercover (see PASSENGER'S DASHBOARD UNDERCOVER REMOVAL/INSTALLATION ).
  2. Disconnect the 4P connector from the front power transistor.
  3. Measure the resistance between terminals No. 3 and No. 4 of the front 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 front power transistor.
      NOTE: Also check the front blower motor. Front power transistor failure can be caused by a defective front blower motor.
      Fig 1: Measuring Resistance Between Terminals No. 3 And 4 Of Front Power Transistor
      G08090282Courtesy of AMERICAN HONDA MOTOR CO., INC.
  4. Reconnect the 4P connector to the front power transistor.
  5. Disconnect HVAC control unit connector B (16P).
  6. Connect HVAC control unit connector B (16P) terminals No. 13 and No. 15 with a jumper wire.
    Fig 2: Identifying Connection Between HVAC Control Unit Connector B (16P) Terminals No. 13 And 15 Using Jumper Wire
    G08090283Courtesy of AMERICAN HONDA MOTOR CO., INC.
  7. Turn the ignition switch to ON (II), and check that the front blower motor runs.
    • If the front blower motor does not run, replace the front power transistor.
      NOTE: A faulty front blower motor can cause the front power transistor to fail. Before replacing the front power transistor, check the front blower motor for binding, and replace it if necessary.
    • If the front blower motor runs, the front power transistor is OK.
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