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HOMESERVICE MANUALSHONDA2009S2000 BASEREPAIR AND DIAGNOSISHEATING, VENTILATION & A/C (HVAC)HVAC CONTROL SYSTEMSHEATING SYSTEMPOWER TRANSISTOR TEST
2009 Honda S2000 Base

Power Transistor Test

2009 Honda S2000 BaseSECTION 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 kΞ©.
    NOTE: Also check the blower motor. Power transistor failure can be caused by a defective blower motor.
    • If the resistance is within the specifications, go to step Β 3.
    • If the resistance is not within the specifications, replace the power transistor.
    Fig 1: Measuring Resistance Between Terminals Of Power Transistor
    G05115918Courtesy of AMERICAN HONDA MOTOR CO., INC.
  3. Carefully release the lock tab on the No. 3 terminal (BLU/YEL) (A) in the 5P connector, then remove the terminal and insulate it from body ground.
    Fig 2: Removing Terminal And Body Ground
    G05115919Courtesy 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 to ON (II), and check that the blower motor runs.
    • If the blower motor does not run, replace the power transistor.
      NOTE: A faulty blower motor can cause the power transistor to fail. If the power transistor is replaced, also check the blower motor for binding, and replace it if necessary.
    • If the blower motor runs, the power transistor is OK.
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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • β€’ You smell fuel, burning insulation, or see smoke.
  • β€’ Brakes feel soft, pull hard to one side, or make grinding noises.
  • β€’ The engine overheats, stalls repeatedly, or misfires under load.
  • β€’ You are missing required tools, torque specs, or safe lifting equipment.
  • β€’ You are not confident in the next step or safety outcome.