RSX Blower Fan Power Transistor Repair - Team Integra Forums - Team Integra
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RSX Blower Fan Power Transistor Repair

Posted 03-31-2009 at 09:27 PM by knavekid

The heater/AC blower fan just stopped working and there is no setting that will make it run.* The likely culprit is the Power Transistor Module.* This is part number 79330‑S6M‑941 and can be seen as item #4 in the diagram below.

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This part can be purchased for about $40 online, but if you are handy with a soldering iron and have access to a multi-meter, this could be a $5 repair, with spares.* The likely cause of the power transistor failure is the thermal cutoff device within the power transistor module.* If the power transistor overheats, this device opens like a fuse and disables the circuit.* If your cabin air filter is clogged, reducing air flow, the power transistor may overheat, so it is a good idea to replace the cabin air filter at the same time as this repair.

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The first thing to do is remove the power transistor which is located just above the ECU in the passenger foot well.* Remove the courtesy panel by pressing in the center of the three fasteners directly below the glove box and then pull out each fastener.* The panel can then be removed by dropping the panel underneath the glove box and pulling it towards the front seat.

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Once the panel is removed, the power transistor can be seen above and to the left of the ECU as shown (circled in red).

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First, remove the connector by squeezing the retainer (circled in blue) and pulling on the connector and fold the harness out of the way.

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Once the connector is out, remove the two screws using a short Phillips head screwdriver.

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You should now have in your hands the power transistor module.* The black plastic cover may be removed to reveal a small circuit card.

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You can now test the thermal cutoff by measuring the continuity across it.* Use an multi-meter to measure the resistance between the two solder terminals as shown.* If the resistance is high or open, the thermal cutoff is blown.* A good thermal cutoff will measure an ohm or less.

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Once you have determined that the thermal cutoff is blown, you will need to purchase a replacement.* These can be purchased from http://www.digikey.com for about 45 cents plus shipping.* Be sure to select First Class Mail for your shipping option (about $2).* The correct part number is Panasonic EYP-2BN135 which is rated to blow at 140C.* However, if they dont have stock of this part, part number EYP-2BN143 may be substituted which is rated to blow at 145C.* These parts are shown here.

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Now it is time to remove the failed thermal cutoff.* Use a solder-absorbent braid like Soder-Wick or Chem-Wick to remove the solder from the five terminals as shown.







After making sure that the five terminals are loose from the circuit card, carefully lift the circuit card from the housing as shown.







Next, remove the white insulator to expose the transistor, thermal cutoff, and retainer clip.* Remove the Phillips head screw and carefully remove the retainer clip and thermal cutoff.* Do not remove the transistor.



The failed thermal cutoff is shown here.* Remove the blue insulation sleeves and move them to the new thermal cutoff or install new insulation on the new thermal cutoff.* Heat-shrink tubing may be used.* The 114C is shown for illustration purposes only.* The 140C or 145C part is the correct part to use.

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Trim and bend the leads on the new thermal cutoff to match the lengths and shape of the old device that was removed.* Check to make sure the leads align properly with the holes in the circuit card.* Put the new thermal cutoff into the housing and reinstall the retainer clip and screw as shown.

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Replace the insulator followed by the circuit card, being careful to get the terminals through the proper holes in the circuit card.

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Now, solder the five terminals and clean any flux residue from the solder joints.







Finally, put the plastic cover back onto the power transistor module and reattach it to the blower housing as you had removed it.







Once the power transistor module has been reinstalled and the harness connected to it, try out the blower and make sure it is working.* Then, reinstall the courtesy panel.* Remove the center parts from the fasteners before installing them.* Once the fasteners are in place, press the center parts into the fasteners to retain them.
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  1. Old Comment
    Just wanted to say thanks Dave for posting this, def came in handy today diagnosing and fixing the problem, I ended up replacing the part but thanks to this and the DIY I was able to save all the money taking it in to figure out what was wrong!
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    Posted 05-28-2015 at 10:20 PM by RSlowX RSlowX is offline
 
 
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