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Go Back   E46Fanatics > Tuning & Tech > DIY: Do It Yourself

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 10-18-2007, 07:14 AM   #41
SamXp
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Quote:
Originally Posted by 2kwiq View Post
the other day, my friend's little brother said they were studying the 80s in high school history class... HISTORY? that's OURSTORY...
LOL no way!
I'll tell you one thing about the 80's - you'd be paying $200 for a key at the stealer because there was no internet, other than a handful of newsgroups, and there sure as heck wouldn't be a sweet pictorial DIY like this one, complete with part numbers and links!
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Old 10-18-2007, 09:51 AM   #42
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Damn, I almost had to do this because I though my key stopped working. I did the procedure to re-sync the key with the car and it works like a champ now
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Old 10-18-2007, 11:21 AM   #43
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sucks, I need to buy a new key now.. its my second dead battery, seems like it doesnt want to charge anymoer
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Old 10-25-2007, 02:24 AM   #44
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Jason77,
I am on mouser.com looking for a battery and I get two batteries for VL2020.

1. VL Lithium Coin Cell Batteries 3V 20mAH 2 PIN VERT
2. VL Lithium Coin Cell Batteries 3V 20mAH 2 PIN HORZ

Which one do I need?
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Old 10-27-2007, 12:36 AM   #45
peanut_man
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Think it's the HORZ one

BTW, does it matter if I have the alarm installed? Registering the keys would be the same procedure?

Thanks
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Old 10-27-2007, 12:46 AM   #46
mike greco
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Great Info
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Old 10-31-2007, 07:21 AM   #47
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By the way, guys, if some of you have key fobs that work, but have really horrible range - it might not be the battery. See this thread:
http://www.m3forum.net/m3forum/showthread.php?t=160179

I'd been having horrible range with my key fob. I basically have to hold it right against the roof to make it work. I ordered the batteries from Mouser, figuring they just weren't taking much of a charge any more. Well, recently the electrochromatic fluid in my rearview mirror leaked out. The manufacturer, Magna Donnelly is replacing them pro bono. When I put my new mirror in, my keyless range came back! I could unlock the car from across the parking lot!

My guess is the electrochromatic fluid has shielding properties and killed the antenna range for the keyless entry system. When I removed the mirror, the keyless entry didn't work at all, so the antenna has got to be up there somewhere.

Might help someone out and prevent them having to chop open their key.
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Old 10-31-2007, 11:12 AM   #48
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Great Info. Thanks.
Saved me money
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Old 11-01-2007, 08:04 AM   #49
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No cigar

Update from hell

Well I eventually managed to get the battery out. I broke the tiny spot welds where the metal straps are tacked onto the battery (upper and lower).

I couldn't find the Panasonic VL2020 here in Belgium (backward country) but I got a generic 3v battery of the same dimensions. This isn't rechargable but should do until I get the right (i.e rechargable battery)?

Anyway, I put the battery in and it still doen't work. Dead as a doornail - f%&*^#$ spewing. Not only that; I discovered that without the circuit board inside the fob, the dumbarse thing won't start the car once it has been locked with the remaining good key. i.e. If the wife drives the car and locks it with her remote, then I can't start car but CAN open car and turn alarm off. Go figure. Anyway, I have put the circuit board back in the fob so I can start the pile of schiesen.

BMW need shooting for;
1. Having such a dumbarse key fob that doesn't allow you to easily change the battery.
2. Then trying to arse-rape you for 250EU to get a new fob when the battery goes flat. Not only that; here in Belgium I need to do a mountain of paperwork for the BMW stealer before I can get a new fob.

All bollocks.
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Old 11-01-2007, 09:45 AM   #50
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Re my post above.

Of course, I tried reprogramming the key (many, many times) after putting in the new battery.

So now am I right assume the circuit board is rooted?

If the PCB is rooted what are my options to get some remote loving happening without getting taken to Browntown by the BMW stealers?
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Old 11-01-2007, 01:55 PM   #51
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Quote:
Originally Posted by Geno68 View Post
Re my post above.

Of course, I tried reprogramming the key (many, many times) after putting in the new battery.

So now am I right assume the circuit board is rooted?

If the PCB is rooted what are my options to get some remote loving happening without getting taken to Browntown by the BMW stealers?
sucks to hear all that, try to solder the welds back on or go to a professional and get it done. MOUSER.com has the battery, dont use anything else.

I didn't have to reprogram the key, it worked fine after I replaced it, post up a pic of your remote maybe we can helpy ou out then
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Old 11-03-2007, 03:56 PM   #52
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i got the new battery in but it still doesnt work
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Old 11-05-2007, 07:03 PM   #53
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Can this be done IF the only key I have has the dead battery?
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Old 11-13-2007, 04:06 PM   #54
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lol i tried this today. i cut myself 3 times trying to open this horrible key fob and then when i went to glue it back together i got glue all over it and now it looks like piss.

hahaha i hate these damn keys!
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Old 11-13-2007, 08:50 PM   #55
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damnit. why doesnt mine work! i gotta figure it out
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Old 11-13-2007, 10:35 PM   #56
bmw_dna
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i have 2 spare set of batteries for this project
$5 for 2
in Orange County, SoCal
let me know
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Old 11-27-2007, 01:00 AM   #57
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Just opened my key and saw that i had sawed away some of the squiggly lines on the circuit board at the end. $#@$@ oh well. think i could reconnect those lines with some wire and sodder? Why is it squiggly like that.. they don't appear connected to anything on the back side of the board?

Worst thing is that the battery in the key fob is showing 3.39volts. My new battery has 3.15 volts. (Yes I tried reprogramming the key many times without luck before opening
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Old 12-07-2007, 10:36 AM   #58
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Great DIY, saved me a bunch of $$$
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Old 12-07-2007, 11:44 AM   #59
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Anyone got a working key fob from a junked car they don't want
Alternatively I can try to buy a silver/gold pen from radio shack and retrace those antenna wires. But the fob wasn't working to begin with anyway.
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Old 12-10-2007, 07:32 PM   #60
wack0
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someone on ebay makes nice empty key fobs with uncut keys really cheap, i got one and its nice as heck
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