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#1
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key batteries
Got two E46 keys here, both with dead batteries. Seems they're of a sealed design, not user replaceable. BMW says buy new keys, at a few $hundred per.
Found this internet guy who does key surgery; he cuts the key open and does a battery transplant. Anyone ever used him? Seems a lot more cost effective than buying new keys. http://www.bmwgm5.com/kr.htm
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George 2004 BMW 325iT 1998 MB E300 turbo Vindaloo Racing FTW!! 944's are fun When the Wright brothers set out to create a flying machine, Science told them it was impossible. |
#2
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Not sure if e46 keys are the same, but I was able to replace the battery in one of my e53 keys as a DIY. It was pretty straight forward, but required a bit of soldering. I didn't have a soldering iron (or any soldering experience, actually), but lucky for me, I was working with another Dorki at the time who was able to help me out. Can't remember who it was, though.
Anyway, e53 DIY here: http://www.xoutpost.com/articles/x5/...y-fob-e53.html I think I even have a brand new battery left over from when I replaced mine, which you're welcome to if it'll work in your key... and you can find someone to solder it in for you. EDIT: Are you sure the batteries are dead? Might try reprogramming to see if that helps. Again, not sure on the e46, but e53 procedure here: http://www.xoutpost.com/articles/x5/...ob-bmw-x5.html
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John P. 1994 968 - DD 1984 944 NA - Low income housing for mice / Lemons Car Past: 1986 951 - sold 1987 944 S2 Conversion - sold 1989 944 NA - sold 1986 944 NA - donated |
#3
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Shame on BMW for making such a stupid (though profit motivating...) design.
The guy you linked does seem to know his stuff. Seems like it would be worthwhile to try him first, before furking over alot more $$ to BMW.
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- Tony P. Currently - 1984 944 SP2 racer - 1977 911 KM Special vintage racer - 2012 Cayman R (also the wife's) - 2000 Boxster S (now mine) - 1995 993 (garage queen) - 2007 Cayman S (wife's track beast) - 2017 F350 (tow monster) - 2018 Jeep Wrangler Gone but not forgotten - 1989 944S2 - 1979 RX7 - 1986 944 - 1991 944S2 (in car heaven...) - 2001 Chevy Suburban 2500 (FIL's beast now) |
#4
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I would be genuinely surprised if the E53 key John posted is appreciably different from the E46 key. They all run off of a battery and I guarantee they're constructed identically. You may need to get the key reprogrammed after battery replacement, but it looks like the guy in the E53 link didn't even need to go that far.
So, I say pull the sucker apart, desolder the battery, and slap the new one back in there.
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Collin M. I wear a cowboy hat. '86 951: lucky number 13...rare 6.0L edition. '06 M3: hers. |
#5
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Quote:
Yeah I read about folks doing this "reprogramming" procedure. I'll give it a shot. Although this is a 2004, which makes these batteries 9 years old at this point, so I'm not too hopeful.
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George 2004 BMW 325iT 1998 MB E300 turbo Vindaloo Racing FTW!! 944's are fun When the Wright brothers set out to create a flying machine, Science told them it was impossible. |
#6
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I always thought the BMW keys recharged when in the ignition?
Did you try leaving in the ignition over night (assuming a secure location).
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2007 Turbo 2005 Lexus SC 430 1966 912 - sold in 2022 2005 BMW X3 - sold in 2022 1975 Vette - sold in 2015 2004 Cabriolet - sold in 2013 1977 924 - sold in 1991 |
#7
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E46 DIY here - http://forum.e46fanatics.com/showthr...ht=key+battery
Battery source here - http://www.batterybob.com/product.asp?intProdID=309012
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Tony K PCA Potomac, Rennlist Member 89 944 Turbo 85 Carrera - Sold TrackVision 944Cup |
#8
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Id try reprogramming first. Mine are from 2003 and still work fine.
I too read somewhere that they charge when in ignition...
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Wonger EX-#121 IP/GTS3 BMW E36 M3 HERE-#121 GTS3/4 BMW E46 M3 http://www.Salazar-Racing.com http://www.brakeswap.com PM me parts/brake requests and orders. I will donate a portion of order to DorkiBoard! |
#9
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Yes, they recharge when the key is in the ignition but the batteries can die and/or develop sketchy connections that need re-soldering. Best bet may be to buy new replacement shell and blade and a battery, get it cut to match your original, then do the transplant surgery to move the RFID and remote transmitter into the new shell.
Seems that every bloody car in our fleet requires a process like this to replace a key [vs shell out silly money to the dealer] Its the challenge, really.
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Tony K PCA Potomac, Rennlist Member 89 944 Turbo 85 Carrera - Sold TrackVision 944Cup |
#10
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We just had http://www.bmwgm5.com/kr.htm repair a non functioning E46 key. Followed his instructions and a few days later the key was mailed back to us. Did the sync thing and the key has been working perfectly ever since. $60 bucks well spent. I going to send him our other non functioning key too. The dealer quote I got was $200 for a new key.
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