M3taCaf3: Hey everyone, check what batteries your key is using BEFORE ordering those CR2016 batteries, my key actually uses CR1220 batteries (2 for one key!).
Victor Rodriguez: Hi Dave !! Great Instructional video,I have the same key remote for an e46 1999 Since a few days It all the times locks without flashing the lights or sound and it wont unlock and the alarm doesn´t activates. sometimes it comes all to normal and then again the issue :s do you think it could be that the battery needs replacement. Thanks
Mark Howard: My E39 2000 540i has the diamond shaped battery. It was designed with screwing the owner in mind. The whole dang key is 'disposable' when the battery dies. I am in the process of breaking it open, mangling the contacts, and attempting to introduce a new Panasonic battery. Wish me luck.
metroman1991: If you have 2 smaller ones it is 2 cr1220.
Ibrahim Beelut: so what size battery should i be buying if i have 1997 528i
Dennis The menace: Hello Dave, thank you for the instructional video!Would theese steps work for a 1997 BMW E38 as well?I only have the two battery keys, not the master key, and the batteries have gone dead, leaving me with a unstartable car ;-)
Killian665: For you guys with the diamond key. You can't replace the battery. It uses a rechargeable cell that recharges while it is in the ignition. There's no way to replace it if it has gone bad, you have to get a new key.
Dewaltd Gagiano: i replaced my battery for my key (bmw 525 1998) but i had the battery out for a while, when i try to re-sync the key with the car, it doesnt work, i have tried all day, with no luck. every time i complete the process, and leave the bottom button, the red light just flashes for a while, but it still doesnt lock or unlock. please reply as soon as you can with some ideas that could work. thank you
Joe Sixmore Lagswing: Thanks for this great tutorial,esp. part 2.
Q: any chance space-wise CR2032 sticks also without breaking clamps?
arwenvalodifellatio: hi can i use defrent key instead my old key i try to change my car REMOTE KEY
Pat Pat.: Great video really helped me out with my e46! Nice to see an instructional vid by a brit too, trawled through loads of yank ones which didnt help at all. Top walkthrough!
Gio Ferrigno: @DebenDave I have a 2002 E39 with the diamond shaped key. can you post something for that or direct me to a known source. i've been looking everywhere.
Repair Fanatic: Make more video only on your BMW
Yeroon: Thanks for sharing! :-)
DebenDave: @TravisBurrell is it diamond shaped?
TravisBurrell: umm.. I have an E39 M5. My key looks nothing like that? It doesnt have an opening like that, and there is no light anywhere?
DebenDave: @DebenDave really!!!
John B. Irvin: Being in America. That make you buy a new key. No battery replacement. I just paid $250 US. If the Germany can steal money from the US they will. I don't think my next purchase will be a BMW.
syahya01: Excellent set of instructions. Can you do one for a BMW 525i, year 2003 model key, too? (US model, just in case European models have a different kind of key). Thanks.
DebenDave: @harri38 You dont need fours keys but that is what the car is supplied with when new. The car of course will work with just one key.
BMW E39 changing the key battery - Part 15
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