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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 05-04-2013, 07:27 AM   #1
Jayp07
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Replacing The Final Stage Resistor (FSR aka Hedgehod) Video

Hi All,

I changed my FSR last weekend and i filmed the process. I ran into a few problems that were not mentioned in the guide i was using so I made this video of my experience start to finish, spark and all!



Hope it helps.
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Old 05-04-2013, 07:36 AM   #2
Big Rick
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I remember using a few choice words when I replaced mine... It can be a bear to change.

Your video should help a lot of frustrated people!
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Old 05-04-2013, 08:12 AM   #3
Jayp07
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Cheers Rick! I appreciate that... I hope it does, it is a DIY job but like you said it can be very frustrating. Still don't know the actual function of the metal spikes but I'll leave that to someone else.
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Old 05-06-2013, 12:57 AM   #4
dznuts007
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I think the spikes act as a "heatsink" and increases the surface area to allow for better cooling
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Old 05-06-2013, 06:38 AM   #5
Jayp07
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Thanks for posting 'D'... I see what you mean - I read that it provides a constant resistance to regulate the fan speed, and i guess as its failing the resistance it provides varies hence fluctuating fan speed ? I was concerned about the spacing between the pins and whether or not they have to remain equal. The new resistor pins have a lot of play compared to the original one.
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Old 05-06-2013, 06:48 AM   #6
dznuts007
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Yeah the newer one has shorter pins, but more pins. If I'm correct on surface area theory of those pins, then having more pins would be increasing the surface area to allow for better cooling compared to the longer, larger pins. Possibly the original ones weren't cooling as well and blowing out easier?
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Old 05-07-2013, 09:21 AM   #7
Packer
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Thanks for the vid. I need to do this soon...

Did it fix your battery drain issue? If not then try replacing the voltage regulator - apparently that is a common cause of this too.
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Old 05-07-2013, 04:17 PM   #8
effay
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thanks i have to do this very soon
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Old 05-07-2013, 06:25 PM   #9
Jayp07
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Quote:
Originally Posted by Packer View Post
Thanks for the vid. I need to do this soon...

Did it fix your battery drain issue? If not then try replacing the voltage regulator - apparently that is a common cause of this too.


No problem lads - I'm glad it will help you I put it off for ages but it has made a big difference.

So far so good with the battery now that it has been done. Sods law i'll go out tomorrow am and it will be flat.

After the ecu stops doing its thing the battery draw drops and holds at 0.08 amps.

Never heard of the voltage regulator before - i will definitely keep that in mind just incase it's not over. Cheers!
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