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Power Transistor Test

WARNING: This page is about a different car, the 2006 Acura MDX, 2005 Acura MDX, 2004 Acura MDX, and 2003 Acura MDX. However, it is still accessible from the selected car via links, so may be relevant.
  1. Disconnect the 5P connector from the power transistor, located under the right side of dashboard near the blower motor.
  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 Resistance Between No. 1 And No. 4 Terminals Of Power Transistor
      G03641890Courtesy 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: Releasing Lock Tab On No. 3 Terminal (ORN/BLK) In 5P Connector
    G03641891Courtesy of AMERICAN HONDA MOTOR CO., INC.
  4. Reconnect the 5P connector to the power transistor.
  5. Supply 12 V 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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