08 key fob no longer charging

djpro1 · 09-10-2015, 02:58 AM

hi guys, my key fob is no longer charging and therefore I can't open and lock the car using it. It does allow me to turn the ignition on. I've driven around several hours and it still doesn't charge.

I don't have comfort access either

What options do I have? I don't want to buy a new key fob!

Cheers, Andrew

naynay · 09-10-2015, 03:00 AM

change the battery

djpro1 · 09-10-2015, 03:03 AM

Quote:

Originally Posted by naynay

change the battery

http://www.e90post.com/forums/showthread.php?t=782996

ever done this before? if so, where did you get the battery?

vtl · 09-10-2015, 03:06 AM

Normally you can't change the battery as the key is glued together. But with some persuasion with a scalpel/screwdriver you can get it open though. The battery is a coin cell rechargable that is soldered onto the board:

http://www.e90post.com/forums/showthread.php?t=811431

Looks easy enough to desolder it and put in a new one if you have the skills. Could help you out if you were in Melb but I see you're in Sydney.

Battery link: [EDITED to correct one]
http://www.ebay.com.au/itm/Panasonic...item4aecdbc671

naynay · 09-10-2015, 03:17 AM

lol didnt even realised theres two types of keys. i got the one on the left haha

LotusBMW · 09-10-2015, 06:14 AM

You can recharge the key battery? I got comfort access and have never put it into the dash in a year of owning the car. This will charge it? Literally yesterday there was a key battery warning on my dash.

vtl · 09-10-2015, 06:22 AM

Comfort access has a user replaceable battery that is not rechargeable. If it runs out, you just replace the battery.

Normal keys are sealed with rechargable batteries. They are charged via induction when placed in the ignition. When the rechargable battery dies, you are supposed to replace the key fob. If you're handy you can solder a new battery in though.

Scotty89 · 09-10-2015, 07:03 AM

I have some of the batteries for comfort access keys.

They are cheap on eBay. I replaced both when I bought the car, and it has not missed a beat since.

LotusBMW · 09-10-2015, 07:44 AM

Quote:

Originally Posted by vtl

Comfort access has a user replaceable battery that is not rechargeable. If it runs out, you just replace the battery.

Normal keys are sealed with rechargable batteries. They are charged via induction when placed in the ignition. When the rechargable battery dies, you are supposed to replace the key fob. If you're handy you can solder a new battery in though.

Thanks

09-10-2015, 02:58 AM	#1
djpro1 Private First Class 13 Rep 161 Posts Drives: 08 E93 335i Join Date: Mar 2014 Location: Sydney, Pymble iTrader: (0)	08 key fob no longer charging hi guys, my key fob is no longer charging and therefore I can't open and lock the car using it. It does allow me to turn the ignition on. I've driven around several hours and it still doesn't charge. I don't have comfort access either What options do I have? I don't want to buy a new key fob! Cheers, Andrew
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09-10-2015, 03:00 AM	#2
naynay Banned 185 Rep 1,426 Posts Drives: 2006 E92 335i FBO Join Date: May 2013 Location: Melbourne Australia iTrader: (0)	change the battery
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09-10-2015, 03:06 AM	#4
vtl Brigadier General 1514 Rep 3,148 Posts Drives: 2008 BMW 135i MT Join Date: Apr 2015 Location: Melbourne, Australia iTrader: (0)	Normally you can't change the battery as the key is glued together. But with some persuasion with a scalpel/screwdriver you can get it open though. The battery is a coin cell rechargable that is soldered onto the board: http://www.e90post.com/forums/showthread.php?t=811431 Looks easy enough to desolder it and put in a new one if you have the skills. Could help you out if you were in Melb but I see you're in Sydney. Battery link: [EDITED to correct one] http://www.ebay.com.au/itm/Panasonic...item4aecdbc671 __________________ Build Thread
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09-10-2015, 03:17 AM	#5
naynay Banned 185 Rep 1,426 Posts Drives: 2006 E92 335i FBO Join Date: May 2013 Location: Melbourne Australia iTrader: (0)	lol didnt even realised theres two types of keys. i got the one on the left haha
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09-10-2015, 06:14 AM	#6
LotusBMW Fast Wagoner 25 Rep 219 Posts Drives: E91 335i \| E36 M3 and more... Join Date: Aug 2014 Location: Melbourne Australia iTrader: (0)	You can recharge the key battery? I got comfort access and have never put it into the dash in a year of owning the car. This will charge it? Literally yesterday there was a key battery warning on my dash. __________________ E36 M3 \| E91 335i \| Nissan Skyline R32 GTR \| Porsche 996 GT3
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09-10-2015, 06:22 AM	#7
vtl Brigadier General 1514 Rep 3,148 Posts Drives: 2008 BMW 135i MT Join Date: Apr 2015 Location: Melbourne, Australia iTrader: (0)	Comfort access has a user replaceable battery that is not rechargeable. If it runs out, you just replace the battery. Normal keys are sealed with rechargable batteries. They are charged via induction when placed in the ignition. When the rechargable battery dies, you are supposed to replace the key fob. If you're handy you can solder a new battery in though. __________________ Build Thread
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09-10-2015, 07:03 AM	#8
Scotty89 Buy a 335 they said... It'll be fun they said... 119 Rep 995 Posts Drives: 2007 E92 335i Join Date: Jun 2014 Location: Melbourne, Australia iTrader: (0) Garage List 2007 BMW 335i [10.00]	I have some of the batteries for comfort access keys. They are cheap on eBay. I replaced both when I bought the car, and it has not missed a beat since.
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