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DIY: Do It Yourself
Post here to share or improve your wrench turning skills! All BMW E46 DIY tips, tales, and projects discussed inside. Learn to work on your car and know the right BMW parts you will need!

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Old 10-03-2014, 09:49 AM   #1
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Is this a Final Stage Resistor problem

Hello, first time poster here. I searched across a number of different forums and was unable to find an answer if my problem is indeed a Final Stage Resistor problem.

In most of the forum posts that I have read, it is mentioned that before the FSR goes, you will notice the cabin fan blowing at sporadic speeds. This did not happen in my case. About an hour and a half into a four hour drive just before last spring the blower on my heating just stopped! That's it, it was working one moment, and while driving, it just stopped.

Heat still very slowly flows out of the vent while driving, but the fan does not work. I have checked all of the fuses and they are all good.

It looks exactly like an FSR issue, but for the lack of sporadic blowing speeds before the fan gave up the ghost.

Is there any other way if I could tell if the problem is the FSR, or do I just have to replace it and find out the hard way?

The car is an 320d Sports Touring early 2005.

Thanks for reading and thanks for all of the guides.

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Old 10-03-2014, 09:33 PM   #2
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Failed FSR can also stop airflow completely as well. If all of the fuses are good then the next step is the FSR. The blower motor itself is a big and pricey job compared to the FSR which is a lot cheaper/easier to change (which I think it is anyways)
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Old 10-04-2014, 09:40 AM   #3
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Sometimes the FSR connector will burn (for whatever reason) and won't provide power to the FSR. I'd pull the FSR and check it and its connector.

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Old 10-04-2014, 10:53 AM   #4
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This sounds exactly how mine failed the first time. No notice... Just stopped blowing when it was about 10 degrees outside. It was a cold ride home!
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Old 10-04-2014, 07:00 PM   #5
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Thanks for the advice guys. I went ahead and replaced the FSR today, that one screw took quite some time. But no luck, everything is exactly the same as before after using a brand new genuine BMW part. I didn't notice any issue with the connector when working on it, so I'm a little puzzled with what do to next.

I did look over all of the fuses again, and noticed that there was a 15amp fuse where a 5amp fuse should have gone, I didn't note the fuse number at the time. I replaced it with a 5amp, but nothing changed.
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Old 10-04-2014, 11:39 PM   #6
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Couple months after I got my car, blower went out first, followed by FSR. You can test your blower motor by completing the circuit at the FSR connector.

Use thick wires and don't **** up. If blower spools up then it is working fine, otherwise you found part of the problem.
If it does spool up then check voltage on pin 3 with key turned to ignition. With blower setting set to lowest there should be up to 2V, I think. When blower speed is set to max on HVAC, voltage will be 8V.

Or could be DOA FSR.
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Old 10-13-2014, 04:09 PM   #7
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After following Pancakes instructions, if you find out the FSR works, don't get too disgusted with yourself for replacing your FSR. BMW redesigned them due to all the problems they were giving people, including starting a few electrical fires. If it hadn't already been replaced once, it needed to be regardless, originals were crap.
If it turns out to be OK, it's probably the blower fan.
Search for: Blower Fan DIY by paraklas for an easy fix with the blower fan from an X3. I've got to order one, mine likes to sing to me.

Last edited by DEADF15H; 10-13-2014 at 04:16 PM.
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