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Blower motor not working

Tiny
XAKEP
  • MEMBER
  • 2004 ACURA TSX

The blower motor does not blow air whether the AC itself is on or off. I think that the AC itself works because when I turn the AC on and drive I feel cold air coming thru. It is just does not matter what setting I choose for the fan, it does not blow at all. I checked the related fuses, they are fine. I have a multi meter and I understand electric diagrams pretty good. The problem is I don't have a diagram if I had one I think it would be easy to diagnose the issue. Please advise on a way to diagnose the problem without a repair shop.

thank you
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Tuesday, August 19th, 2008 AT 10:19 PM

9 Replies

Tiny
2CARPRO JACK
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Start by testing for power at the blower motor to see if it is getting any. Ifiti has power adn doesnt blow, check continuity of other wire or housing to ground, if good the blower motor is bad, if no power, check fuse 21 in underhood power center. If ok, try swapping the blower motor relay with another to see if that works, if that doesnt work, itis probably th eblower motor power transitor, located on the bottom of blower unit, see if it has power in but not out
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Wednesday, August 20th, 2008 AT 7:57 AM
Tiny
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I thought about doing this but I cannot figure out which one is the blower relay. The pictures on the fuse box are not very self-explanatory. Could anybody tell me which relay is the blower one? There are total 5 as far as I remember, 3 at the upper part and 2 at the bottom of the fuse box
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Wednesday, August 20th, 2008 AT 9:01 AM
Tiny
KHLOW2008
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Hi xakep,

Did you test the power supply to the blower motor as advised?

I suspect the blower motor is faulty.
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Wednesday, August 20th, 2008 AT 9:25 AM
Tiny
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The blower motor unit works. I checked by connecting power to it directly. It blows pretty good :).
Next I checked if it gets any power. When I disconnect the power plug from the blower motor unit the multimeter shows 12.5VDC, whether ac is on or off. When I connect the plug back to the blower unit the meter shows 0 to very small Volts, whether AC is on or off. The fuses are all fine. I was not able to trace where the wire goes exactly. Can anybody tell me where those wires go or what should be the next checkpoint? I think that the blower motor power transitor is located outside the blower unit, do you know where it is on acura tsx?
Thanks
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Thursday, August 21st, 2008 AT 9:34 AM
Tiny
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Hi xakep,

Hope the diagrams help.
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Thursday, August 21st, 2008 AT 9:47 AM
Tiny
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Thanks a lot for the diagram, but I cannot read it well. The image was probably resized by the web-site. Could you please upload it to some image/file sharing web-site that does not resize images or at least keeps a decent resolution. Alternatively, could you email it here please tigran_m@mail. Ru.

Thank you
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Thursday, August 21st, 2008 AT 12:42 PM
Tiny
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I am pretty sure that I got a failed blower transistor because when I connect the blue/black wire to the ground the blower motor runs. The blue/black wire is connected to the negative of the blower motor.

Please help to find where the speed control transistor is mounted.
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Thursday, August 21st, 2008 AT 7:52 PM
Tiny
KHLOW2008
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Hi xakep,

Under the right side of the dash

See the diagram below
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Friday, August 22nd, 2008 AT 7:56 AM
Tiny
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THANKS! I located the transistor. Trying to order it now.
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Friday, August 22nd, 2008 AT 2:14 PM

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