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Rearview Mirror Remote Receiver Damage...or Fob Battery?

Old 07-07-2018, 08:45 AM
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Join Date: May 2013
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Exclamation Rearview Mirror Remote Receiver Damage...or Fob Battery?

I have a 2007 Mini Cooper S and for a couple years I've had a leak through my rearview mirror. I've seen a number of other people complain about it so I know it isn't that unique...after a heavy rain I'll be driving and water will be dripping out of the bottom of the rear view mirror. It was never more than an annoyance until recently when the remote keyless entry stopped working. I don't have the easy-access key fob, so it's not easy to open up the fob and look at the rechargable battery. I did remove and open up the rearview mirror and found some corrosion on the electronic chip. I cleaned it off with a toothbrush and isopropyl, plugged it back in, but it still doesn't work. (see attached before and after photos). So I have a few questions.
*If the chip is fried and I buy a new chip or a salvaged mirror and swap the chip, does the key need to be reprogrammed by Mini?
*Is there any way to tell if the battery in the fob is at fault without taking it to the Mini dealer and paying $80 just to find out?
*I checked the fuses for the lock icons, but are there other fuses I should be looking at as possible culprits?
*Has anyone ever actually found a solution for this waterfall out of the mirror issue? I've seen others complain that it's after a windshield is replaced...and mine was replaced a number of years ago so that may be it. But unsure how to stop it now.

Thank you in advance for your help!!
Attached Thumbnails Rearview Mirror Remote Receiver Damage...or Fob Battery?-20180707_073823.jpg   Rearview Mirror Remote Receiver Damage...or Fob Battery?-20180707_083024.jpg  
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