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02-04-2009, 02:02 PM
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#1 |
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CSL Register Uber-poster!
Join Date: Jun 2008
Posts: 4,247
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car key battery
I thought my car battery was dead but it appears to be the key fob, any ideas how to open the key to change the battery
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02-04-2009, 02:03 PM
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#2 |
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Driving it like I nicked it
Join Date: Sep 2008
Posts: 2,099
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You need a soldering iron...
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02-04-2009, 02:20 PM
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#3 |
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S5, Sport On, DSC M-track
Join Date: Nov 2008
Location: Scotland (sw)
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and a really big hammer...
Good question though. |
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02-04-2009, 02:37 PM
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#4 |
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S5, Sport Off, DSC M-track
 
Join Date: Sep 2008
Location: CORNWALL
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has the car been stood? if so the battery might just be flat it charges when driving might have just gone out of sync
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02-04-2009, 02:42 PM
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#5 |
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CSL Register Uber-poster!
 
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Use the key they charge when it is in the ignition
 Like dave1 said |
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02-04-2009, 06:25 PM
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#6 |
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CSL Register Uber-poster!
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Thanks, I will give it a go, I've used the spare for the trip, I didn't know they re charged
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02-04-2009, 09:15 PM
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#7 |
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S2 - Picking it up
Join Date: Feb 2009
Location: South
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The keys don't have a battery as such you can change. Is a coil which is charged when the key is in the ignition when running.
If you are having trouble opening the doors with the key it could be the GM5 module on the way out. Common problem with E46's. Not sure how affected the coupes are as they have less doors to unlock!! Just had to replace two relays in the module on my E46 Touring. Good site for info. http://www.bmwgm5.com/ |
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02-04-2009, 09:30 PM
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#8 | |
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Driving it like I nicked it
Join Date: Dec 2007
Location: Northern Ireland
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Cheers JD, some good info there. So, in theory, if you never use your spare keys, could they loose there charge and result in being defunct?
Is it a good idea to rotate keys then?
__________________
 My Car 2004 M3 CSL with Supersprint Lightweight Race and AP's front and rear Quote:
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02-04-2009, 09:43 PM
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#9 |
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S5, Sport On, DSC M-track
Join Date: Jun 2008
Location: Scotland
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i thought they had a battery and it was charged via induction maybe im wrong but how does it store a charge for so long as coils don't store electricity, capacitors can
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02-04-2009, 10:19 PM
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#10 | |
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S2 - Picking it up
Join Date: Feb 2009
Location: South
Posts: 74
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Quote:
Didn't want to get too technical but yes the key uses a rechargeable battery charged via induction coil. You can replace the battery but involves taking the key apart and having to resolder in a new one once you found the correct type. Is a DIY on it on E46fanatics i think. Other issues could be that the key has lost its sync with the car and requires re-coding. I try to remember to rotate the use of the keys to keep them charged but it is possible that the battery can eventually die... |
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Linear Mode
