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DIY: Do It Yourself
Post here to share or improve your wrench turning skills! All BMW E46 DIY tips, tales, and projects discussed inside. Learn to work on your car and know the right BMW parts you will need!

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Old 01-07-2014, 11:14 AM   #421
riverjamie
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Jason, do you remember which battery you ordered was it the one with Horizontal or Vertical pins? Thanks
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Old 01-12-2014, 09:34 AM   #422
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To what AC said... I just re-did this job for about the fifth time. The last time I did it was several months ago, and that time the remote worked for only a few weeks before it failed again. I really thought I might have damaged the inductor or something else that allowed the battery to recharge, and was just about to give in and order a brand new key. But I gave it one more try, and it worked perfectly. As he mentioned, it was probably just a bad solder that lost contact.

It's amazing how much more this makes me like my car -- I'm not one who cares about luxury or a bunch of bells and whistles, but remote locks are a must IMO. Besides, when I repaired the window regulator on my drivers side a few weeks ago, I left out one cable clip and it make my door latch fail. So I was one accidental lock from not being able to get in my car anymore. And from months of using my key in the physical lock, I was starting to feel some wear in there. With the remote locks, that wouldn't have been an issue.

BTW, riverjamie... I got the horizontal pins. You don't have to get that one, but I do think it makes it a little easier. Years ago when I first did this repair, that wasn't even an option.

Last edited by Chocolate Lab; 01-12-2014 at 09:39 AM.
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Old 01-13-2014, 10:12 AM   #423
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Chocolate lab, do you remember which style of battery you used? did it have Vertical or Horizontal pins on it for soldering? Also where did you purchase it from, and item number. Thannks
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Old 01-18-2014, 02:07 PM   #424
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Quote:
Originally Posted by riverjamie View Post
Chocolate lab, do you remember which style of battery you used? did it have Vertical or Horizontal pins on it for soldering? Also where did you purchase it from, and item number. Thannks
Sorry, just seeing this... I got it from Mouser here:

http://ca.mouser.com/ProductDetail/P...jiByYlW3jlUA==

You can get it from Digikey also, but I got it here because I'm only about 120 miles from Mouser and I wanted to get it faster.

Actually, I think I looked afterwards and it may have been a fraction cheaper from some ebay sellers -- just be sure and get a genuine Panasonic and not a cheap knockoff which I've read can be duds.
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Old 01-18-2014, 07:54 PM   #425
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Thanks for getting back. So you used the one in the link with Horizontal pins and not Vertical?

Thanks again
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Old 01-18-2014, 10:56 PM   #426
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Yep, that's the one. I ordered two and if I could find the other one, I'd send it to you for a few bucks. But I don't know what I did with it.

You could use the vertical one -- some people take the tabs all the way off so it doesn't matter. I left one in and stuck it through the board and soldered it on the opposite side. Probably not the preferred method, but again I did this the first time years ago when this info was just getting out there, and that's just the way I did it.

Last edited by Chocolate Lab; 01-18-2014 at 10:57 PM.
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Old 01-19-2014, 11:36 AM   #427
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Thanks Chocolate Lab, mine is still working but my next door neighbor who has a X5 was having the problem with the key not taking a charge. She just didn't want to wait for a battery. So she got a new key $170. Just curious how long did it take to charge up the new key? I heard you can put it in a Sonicare Tooth brush charger overnight to charge it up?
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Old 01-19-2014, 11:38 AM   #428
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I wanted to ask, if you buy a new replacement key with a different code. Then you the the procedure to recode the new key, what happens to the second key with the old code? Do you have to do the recode procedure for the old key? Do you do them at the same time? Thanks
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Old 01-19-2014, 07:22 PM   #429
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Great thread, looking forward to figuring out my keyless issues on my recently purchased e46 after reading the whole thing. Yes, I sat down and took the time to read the entire thing. Don't be lazy if you want to fix it yourself and please read it all before posting your questions, they have most likely been answered several times already.
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Old 01-21-2014, 07:44 PM   #430
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Link below specifies BMW FOB, can someone confirm that's the right one to purchase?

http://www.ebay.com/itm/Panasonic-ML...item25865a8391
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Old 01-21-2014, 10:25 PM   #431
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Originally Posted by golanM3 View Post
Link below specifies BMW FOB, can someone confirm that's the right one to purchase?

http://www.ebay.com/itm/Panasonic-ML...item25865a8391
That is the one I got
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Old 02-10-2014, 09:29 AM   #432
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So if replacing the battery it is highly recommended to replace it with one of these VL2020 from Panasonic?

All I find locally is CR2016, CR2025 etc..
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Old 02-10-2014, 09:29 AM   #433
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Scratch that.. ordered the proper batteries online.

Last edited by jeepo23; 02-10-2014 at 12:58 PM.
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Old 02-10-2014, 03:41 PM   #434
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CR20xx batteries are not rechargeable so not suitable.
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Old 03-12-2014, 07:42 AM   #435
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Here is another data point for an old thread.

My key fob for my 2002 330i had not worked in over a year. Before doing anything I went to my local O'Reilly's and used their RF fob tester and found that no signal was being emitted. With this information my obvious next step was to cut it apart. I used a razor that allows the length of exposed blade to be precisely controlled as others in this thread have suggested. After I removed the cover I measured the existing battery without removing it: 3.2 volts without load and 2.8 volts when any button was pressed. Then, out of nowhere, it started working again when I tested it! What a surprise. Must have been a loose connection that was reconnected by all the jostling I did when cutting it apart. I inspected the board carefully and found no obvious cracks or loose solder connections. I taped it together and plan to use for awhile until I can verity that it continues to work before I glue it back together.
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Old 03-12-2014, 07:42 AM   #436
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duplicate
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Old 03-25-2014, 11:41 AM   #437
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Hi! Great write up ! I didnt remove the copper coiled transponder, either the 8 pin thing. I just put my old transponder in the key, and I can start my car, but there is one big problem - The key could not be programmed, I tried to do it but no reaction... My exicting key programms succesfully, but the new one has no reaction?! Any guessings??? Is there a way to tell that a button is pressed (in the diamond key) ? to the old key a light comes up when you press a button... Many thanks!!!
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Old 03-31-2014, 05:51 PM   #438
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No one?
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Old 04-04-2014, 07:14 PM   #439
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Just got my replacement battery today and installed it, quick question. Will I screw it up if I try it w/o re syncing it? I have one other working key, but saw some got lucky and it worked w/o reprogramming? I'm just paranoid about rendering both keys useless.

Sidenote: I used a sharp fileting knife and got through the entire casing in less than 2 minutes, if by chance that helps anyone. The long blade and handle and razor sharpness really worked, just used a little sawing motion.
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Old 04-04-2014, 09:24 PM   #440
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Well I tried programming it, nada. I think I ruined the battery trying to solder it. Gonna order another one and just slip it in there(no solder). I'm really pissed at myself, cause I did it real quick and neat but was just a little off center, and cover wouldn't fit right, so I heated to loosen it, and think that's when I fried the battery. Incidently the original one I took out was dead as a door nail. New one starts car fine, just like old one, no door locking or trunk. I don't want to crack it open again till I get a new one, but will try longshot of driving with it tomorrow and see if by miracle it charges itself.
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