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-   -   Final Stage Resistor fix DIY (https://xoutpost.com/bmw-sav-forums/x5-e53-forum/75414-final-stage-resistor-fix-diy.html)

greggw2gs 07-30-2011 12:34 PM

I just replaced mine last week for $55 plus 1 1/2 hours of beer drinking work. I would recommend just replacing the unit if you have the money. Getting access to this resistor isn't the easiest thing to do so I wouldn't want to have to go in there again...

Jordo 07-30-2011 03:37 PM

I just noticed my rear vents not working. I thought I noticed it getting weaker, but could have been in my head. Does this part control the rear fan motor?

Thanks!

HEISING 07-30-2011 06:54 PM

This fsr does not effect your rear fan.

Hey guys, glad to see people benefitting from the the DIY! Such an easy fix too. Eventually your new fsr will do the same thing "greggw2gs" so better stock up on the beer :D Hope you saved the old one so you have something to swap in.

greggw2gs 08-01-2011 06:26 PM

Wow I hope the new one lasts long enough to make it worthwhile... I did save the old one but I can't see myself putting that old one back in...

HEISING 08-01-2011 07:01 PM

Quote:

Originally Posted by greggw2gs (Post 836791)
Wow I hope the new one lasts long enough to make it worthwhile... I did save the old one but I can't see myself putting that old one back in...

You would not swap in the old one after you have rebuilt it? I guess if your unsure of the process, or don't have a soldering iron, this could pose a problem.

For some, it's better to just purchase a new one.

bbh03 08-01-2011 09:58 PM

Repaired doesn't last forever I guess. Mine crapped out again today after less than one year. Time to go with the new design.

HEISING 08-01-2011 11:37 PM

Sorry to hear your didn't last. Mine...it has been 2 years and still no problems. Do you think it may be your soldering job? Your solder should look like mine.

Compare photos on page 1.

There is no other part in the FSR that fails other than solder and the motor drivers. Usually the only reason the motor drivers fail is due to the solder, so it's kind of a circle. The biggest problem here is the pad area around the driver is not big enough. This is why the solder area is larger in my rebuilt FSR.
If you can not make the solder job look like my picture, the FSR may not last. The connections get very hot (driver transistors) so its imperative the solder flows properly.

What ever your solution, I wish you luck :thumbup:

katit 08-14-2011 03:28 PM

Fixed mine today. Yes, solder on second picture looks like why it failed again.. If one can solder I don't see point in buying new one.

Thanks!

bbh03 08-15-2011 07:31 AM

I can solder just fine, but I was not able to get the area clean enough so I just went with it. I was surprised it worked at at the time because of the amount of resin garbage left there. Regardless, I was able to get a new part for $35 so no big deal.

katit 08-15-2011 12:14 PM

Brake clean and some q-tips worked very good for me


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