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E90/E91/E92/E93 (2006 - 2013)
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  #1  
Old 01-01-2011, 07:32 AM
MrVegas MrVegas is offline
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Replace battery in key fob?

I have a 2008 335i. Is there a battery in my key fob? If so, how do you replace it?

p.s.
I don't think I have Comfort Access, although I'm not really sure what that is.
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  #2  
Old 01-01-2011, 07:40 AM
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bwillia bwillia is online now
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There is a battery in your FOB but it recharges inductively when it is in the "ignition" slot in your car. Your owners manual talks about it. Make sure and use both of your keys periodically to recharge them.
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Old 01-01-2011, 11:26 AM
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GiaGiaJa GiaGiaJa is offline
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You can watch this or similar Video on YouTube save some money but ended up cut yourself in the hand and have to drive to UMC




Or Drive to Desert BMW and call it a day I think you might need dealer help for that.


Ahhh Nevermind...You are MrVegas but live in MD
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Old 01-01-2011, 11:35 AM
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markl53 markl53 is offline
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Quote:
Originally Posted by bwillia View Post
There is a battery in your FOB but it recharges inductively when it is in the "ignition" slot in your car. Your owners manual talks about it. Make sure and use both of your keys periodically to recharge them.
If the OP has CA, that fob does not have a rechargeable battery. You open the battery compartment by first removing the metal key part, then popping open the cover. Without CA, yes the battery recharges when in the key slot.

It's easy to know if you have CA on an '08 3 series. Your door (or all doors depending on setting) will unlock when you grab the outside handle to get in the car assuming the key is in your pocket or nearby. Also you can start the car without putting the key in the dashboard slot.
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Last edited by markl53; 01-01-2011 at 11:36 AM.
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  #5  
Old 01-01-2011, 11:38 AM
Tom K. Tom K. is offline
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Quote:
Originally Posted by GiaGiaJa View Post
You can watch this or similar Video on YouTube save some money but ended up cut yourself in the hand and have to drive to UMC




Or Drive to Desert BMW and call it a day I think you might need dealer help for that.


Ahhh Nevermind...You are MrVegas but live in MD
That video shows an E46 key, not an E90 Fob.

OP: If you have comfort access (you really need to find this out - it will be on the original window sticker), then the instructions for replacing the battery are in the owner's manual - it takes a CR2032.

If not, I'd have a dealer do it if the battery won't recharge when you drive the car.

Tom
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Old 01-01-2011, 03:33 PM
Southwest Southwest is offline
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My FOB is also broken although it does work off and on. It's the non-CA FOB. I'm going to make an appt. next week. While it's the only thing that has gone wrong with my 38-mth.-old car, my gut tells me the key FOB is a high-failure rate part (you think they put the back up key in the FOB out of the kindness of their hearts or as a sign of no confidence?).
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Old 01-01-2011, 06:21 PM
Vulpes Vulpes is offline
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Originally Posted by Southwest View Post
My FOB is also broken although it does work off and on. It's the non-CA FOB. I'm going to make an appt. next week. While it's the only thing that has gone wrong with my 38-mth.-old car, my gut tells me the key FOB is a high-failure rate part (you think they put the back up key in the FOB out of the kindness of their hearts or as a sign of no confidence?).
There is a key built into the FOB.. But I don't think it will actually start the car, maybe that is what you're referring to?

UPDATE: I misread your comment.. But on a slightly different note, how is your FOB failing?
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Last edited by Vulpes; 01-01-2011 at 06:23 PM. Reason: misread the post
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  #8  
Old 01-01-2011, 10:07 PM
Southwest Southwest is offline
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UPD
Quote:
ATE: I misread your comment.. But on a slightly different note, how is your FOB failing?
The car will start with the FOB but the FOB won't allow me to open or lock the car. Today I did about six unique errands and at times it would unlock the car and other times lock the car but for the most part it failed to do either. Same thing happens with the trunk (I have the sports wagon). I use the key inside the FOB to lock and unlock the car when the FOB doesn't do the job.
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