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BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Technical Forums > Mechanical Maintenance: Break-in / Oil & Fluids / Servicing / Warranty > Battery for keyless



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      12-03-2009, 02:26 PM   #1
burberry
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Battery for keyless



What kind of battery does the keyless entry use? Do I have to purchase it from BMW dealer?
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      12-03-2009, 05:36 PM   #2
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If it's non-Comfort Access, it's rechargeable.

If it's Comfort Access, it's one CR2032. You can buy a 2-pack of them at Wal-Mart for less than $5.
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      12-04-2009, 03:45 PM   #3
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They make rechargeable key FOBs? How does it charge?
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      12-04-2009, 06:11 PM   #4
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Quote:
Originally Posted by FCPGroton View Post
They make rechargeable key FOBs? How does it charge?
If you don't have Comfort Access, the battery charges while the fob is engaged in the slot below the start button. Obviously this is only for cars with push-button start and no key.
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      12-07-2009, 11:07 AM   #5
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how do you know if there is comfort access or not?
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      12-07-2009, 12:04 PM   #6
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Opening your door by just touching your door knob without pushing the remote,

or you can start your engine without having to insert the fob in the slot.

basically having your key in your pocket the entire time.
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      12-07-2009, 02:37 PM   #7
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Quote:
Originally Posted by sidekick96 View Post
Opening your door by just touching your door knob without pushing the remote,

or you can start your engine without having to insert the fob in the slot.

basically having your key in your pocket the entire time.
yeah that's what i have. so i guess i have to replace batteries. so do they use two of them or just one?
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      12-07-2009, 02:44 PM   #8
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Quote:
Originally Posted by Thunder Dump View Post
If it's non-Comfort Access, it's rechargeable.

If it's Comfort Access, it's one CR2032. You can buy a 2-pack of them at Wal-Mart for less than $5.
thanks for the information regarding what type of battery it is. I just ordered the "CR2032" from eBay, 5 pieces for 4.69$ with free shipping.
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      12-07-2009, 05:11 PM   #9
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You can get them from the grocery store for about $1.50.
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      12-07-2009, 06:26 PM   #10
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Quote:
Originally Posted by burberry View Post
yeah that's what i have. so i guess i have to replace batteries. so do they use two of them or just one?
Only needs one.
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      12-07-2009, 06:57 PM   #11
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How do you get to the battery to change it? A picture would really help.
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      12-08-2009, 12:01 AM   #12
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Quote:
Originally Posted by kgoto View Post
How do you get to the battery to change it? A picture would really help.
It's very easy. Remove the metal key first. The backside of the remote has an obvious battery door on it. Once you remove the metal key you'll see a small slot that you can use something (fingernail, paper clip etc) to lift up the cover and remove the battery. The cover just friction fits on the back with a rubber gasket/seal.
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      12-08-2009, 04:16 PM   #13
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Quote:
Originally Posted by Thunder Dump View Post
It's very easy. Remove the metal key first. The backside of the remote has an obvious battery door on it. Once you remove the metal key you'll see a small slot that you can use something (fingernail, paper clip etc) to lift up the cover and remove the battery. The cover just friction fits on the back with a rubber gasket/seal.
Got it!, thanks...
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      02-20-2010, 08:48 AM   #14
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Thank you for this info
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