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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 07-03-2012, 03:06 PM   #381
ShaTR
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Quote:
Originally Posted by VIKTR View Post
With my other key, the car would automatically lock all the doors when I drove off.

With the key I now use, the doors don't lock unless I lock them.

I had thought that the function was programmed into the car, but I do remember reading in the manual that the car can be programmed to where different keys have different settings.
ah cool. Gonna have to check this out in bmwscanner. Maybe there's an option to unlock all doors with first press
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Old 07-03-2012, 03:07 PM   #382
VIKTR
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Quote:
Originally Posted by ShaTR View Post
ah cool. Gonna have to check this out in bmwscanner. Maybe there's an option to unlock all doors with first press
If you find something, let me know.
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Old 07-03-2012, 04:52 PM   #383
eneka
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Quote:
Originally Posted by VIKTR View Post
With my other key, the car would automatically lock all the doors when I drove off.

With the key I now use, the doors don't lock unless I lock them.

I had thought that the function was programmed into the car, but I do remember reading in the manual that the car can be programmed to where different keys have different settings.
you can have various functions programmed as "defualt" and others that go with the keys. If i use the door lock to unlock my car then it'll operate with the default settings that are on my car. If i use the remote then it'll set to driver 1/2
Quote:
Originally Posted by ShaTR View Post
ah cool. Gonna have to check this out in bmwscanner. Maybe there's an option to unlock all doors with first press
I believe that is possible.
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Old 07-03-2012, 05:32 PM   #384
VIKTR
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Hmm, now I'll have to read into what other functions I can program into the car as default.
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Old 09-16-2012, 10:21 PM   #385
dangdude
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Re: horizontal or vertical mount

They are selling the horizontal (flat) mount on eBay. I bought horizontal mount last time, it wasn't great. The horizontal mount tabs are 180 degrees apart, the vertical tabs are 0 degrees apart (with some spacing), and the key is expecting a battery with terminals 90 degrees apart, so neither is "right". After trying a horizontal mount, I think the vertical mount will be easier to modify to work. Mouser shows a horizontal mount battery for both types (it's wrong). Digikey has the right pic for vertical mount:
http://www.digikey.com/product-detai.../P082-ND/17263

These tabs might be bent to fit the circuit board's 90 degree apart placement. I'll be buying these from now on. Don't worry about using a "cheater" wire between one tab and the circuit board if you have to. If I remember I'll report back on how the vertical tab mount worked.
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Old 10-25-2012, 02:00 AM   #386
annag
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Wish I'd found this thread last week - both my keys have been working/not working intermittently and so I have been locking manually and eventually the central locking failed. I took to our BMW specialist who seemed confused and have now had the car for 6 days. They fixed the central locking and thought that would fix the keys (even though I told them it wouldnt as keys werent working before) They then replaced the "diversity unit" but still wasnt working so have now programmed a donor key and decided that both keys were broken. Seems weird that both keys could break and now thinking if I'd reprogrammed the keys before I took it into garage it would be working now and saved me 600!!!!! I think Ive been ripped off and am so fed up. Any advice please or is it too late now Ive let them spend the money. I just want my car back now and they say hopefully before the weekend!
Thanks
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Old 10-25-2012, 08:42 AM   #387
dangdude
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Quote:
Originally Posted by dangdude View Post
Digikey has the right pic for vertical mount:
http://www.digikey.com/product-detai.../P082-ND/17263
.
Reporting back. The vertical mount batteries weren't any better. I still ended up having to make a jumper wire. Buy the horizontal mount battery. Good news is I've now fixed 3 keys thanks to this thread.
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Old 11-20-2012, 02:14 AM   #388
tdm
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My remote suddenly stopped working yesterday after about 2 years of keyless bliss. I asked google and it found this thread. So I read the first page of this thread, then sliced open the key (clean job, no damage to key or fingers, yay!)

I started to order a new battery but I was horrified that shipping was 2x the price of the battery so I read some more before hitting 'buy'. I found a post that mentioned good battery but bad contacts, so I checked .. the battery has 3.1v normally and low 2's when a button is depressed. So the battery seems good.

The solder joints look good visually and the positive feels stuck on pretty well. I haven't pulled it out to check the negative.

Does anyone have suggestions on how to further diagnose between (1) battery contacts, (2) a bad fob circuit board, (3) something in the car (FZV amp?), or (4) something else? I'm afraid that I don't have a whole lot of time or equipment to be tinkering too much, but on the other hand, I'd hate to just start replacing things at random.

Thanks in advance for any advice. This thread has been a huge help already!
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Old 11-20-2012, 05:17 AM   #389
Shonky
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It really shouldn't drop in voltage that much when transmitting. Have you driven around with it for a reasonable time to charge the battery? The battery should have enough charge to work initially

Also have you re-synced the key to the car since replacing the battery?

If you soldered it in, there really can't be bad battery contacts. The spot welds to the battery are either connected (or not)
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Old 11-20-2012, 09:01 AM   #390
dangdude
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tdm, Shonky is right, a 1/3 drop in voltage is unacceptable. If the voltage is less than ~2.7 under load, a signal is probably not even being produced. My O-Reilly's has a "key transmitter tester" tool that lights up when it detects a keyfob signal. You could see if a local car shop has that tool, but even so, the frequency might not be correct with so low of a voltage. If your key IS sending a signal but your car isn't unlocking, that's more proof that the battery is too weak.

I think you really need to replace the battery. One of the keys I've opened actually had a broken pin from the battery mount so it was obviously an open circuit, but another had a weak battery like yours, and replacing the battery fixed it. I agree that the shipping is high (you sound cheap like me!). I bought a few batteries on the last order, and have fixed two keys from it, so it helps spread the cost.

Another tip. I have learned the hard way to sand smooth the rough edges left by cutting open the key before gluing them back together. Two of the keys I fixed broke apart when their respective keychains were dropped on cement. Sanding the edges smooth and flat using a sandpaper block resulted in (so far) break-free repairs.

Finally, if your SO uses one of the keys you fixed, explain to (her) how to put the circuitboard back in the shell and tape/rubberband it in to get the car to start so she's not stranded if she drops it and it breaks when she's out.
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Old 11-26-2012, 06:39 PM   #391
TopazBlu02
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My two key fobs stopped working today. Jumped on Ebay and ordered two Panasonic batteries for $14.90 which includes free shipping.

So I could just program one key fob at a time and the other one doesn't have to be working correct? Hopefully I could be lucky like one member here where he just replaced the battery and didn't have to do any further programming.
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Old 11-26-2012, 06:40 PM   #392
Shonky
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Sometimes you don't have to reprogram I found. However if you do reprogram you have to do them all at once.
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Old 11-28-2012, 04:20 PM   #393
jensdad
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Cool replacing battery in key fob

great diy, great thread. I opened up the key fob, no problem. I detached the old battery by using a jacknife blade to gently pry under and break the welds on positive side. I then lifted ( bent) that positive moon shaped connector arm vertically and out of the way. I then lifted the old battery up to expose the welds on the negative side and I used the knife to break the welds on neg side. The battery came away then. I then straightened out ( re-bent) flattened the pos. and neg. connector arms that I had twisted during removal of old battery. Both pos. and neg. conn. arms are still soldered attached to the circuit board. Kind of like a sandwich. So, when I receive the new battery, why can't I just slide it in between the pos. and neg. arms ( top and bottom), maybe use epoxy to hold the new battery in place and be done? Did I miss anything?
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Old 12-02-2012, 09:10 AM   #394
jensdad
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as noted prev., I have the old battery out. When I opened up the fob, I noticed a whitish film or corrosion on the circuit board in the area of the squiggly (antenna) line and going up the board a bit. I tested the old battery & got 3v. I placed the old battery back in the battery clamshell holder and tested the actual battery contacts on the circuit board, 3v. Good. So I have battery contact. I then put the tester probes on each side of the little push button switch that opens the doors (there are 3 switches). I had my wife use a toothpick and push down that switch, nothing, no reading just 000. I then did the same on the center switch, got 3 v. I didn't test the last switch. I wonder if I have a bad "door opener" switch due to past corrosion? I will still install the new battery when it's delivered but corrosion may have damaged the circuit board. I'll keep you posted.
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Old 12-02-2012, 09:32 AM   #395
scottjoh
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I keep telling people to measure the battery before doing anything, because, very very rarely does it need to replaced. Brand new batteries measure 2.95-3.00 Volts. The original battery will measure between 3.05 and 3.25 Volts. I usually fine bad buttons switches, broken connections or a cracked component. Failures I see are due to mechanical stress (1000's of button presses and physical shock to the key).
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Old 12-04-2012, 06:07 AM   #396
jensdad
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scottjoh. Do you work on these circuit boards, replacing components?
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Old 12-14-2012, 11:15 AM   #397
loangolfer
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wow great thread! I just got a new key from the (s)dealer. Paid $178 for the fob & $122 for the lock cylinder. They delivered them to the dealer in 3 days. Programmed key in 10 sec works great. Dealer guy said the old key may "revive" if you reprogram at the same time. No luck, so I'm going to try some of the DIY's posted here. The E46 is an '01 so the key probably has been used a lot, so a mechanical failure is possible. I just replaced Alternator, power steering pump, water pump, PVC (oil separator) did the oil flush and replaced mobil 1 with Liqui Moli ..... what a difference, smoother than before also less "cranks" to start. So I know that mechanical things wear out. With the E46 replacing this stuff makes it run like new! OK wrong thread sorry..... now I did find a "fix it" guy for the diamond key.

http://www.bmwkey.com/?gclid=CKCi492pmrQCFUQw4AodTjQAZw

I didn't use him yet but the cost is 1/2 what I paid!
To bad I didn't find him before..........

If anyone uses this guy please post good or bad review.

Andrew

Last edited by loangolfer; 12-14-2012 at 11:17 AM. Reason: hit touch pad posted b4 i was done
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Old 12-16-2012, 07:37 PM   #398
cgd
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Check you BASIC fuses! Out of the three relateded to central lock the #25amp was blown. Repaced and all LOCKING issues resolved. Start simple!
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Old 12-26-2012, 02:28 PM   #399
Juliopinto03
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Thanks for the info! I'm in the same shoes where I have a working Key and one that the battery died.
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Old 01-05-2013, 06:16 PM   #400
andy_bee
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Question for you guys. How many had to reprogram the key afterwards to get the remote working.

The issue I have is about a yr ago, someone tried to break into my car and bust my lock. I got a cover to go over the lock and now my remote key has stopped working. Unfortunately as its a 2nd hand car, I only have one key.

So...I have no way to get into the car If the remote doesnt need re-programming after a new battery, then I have a chance. otherwise I'm buggered. Key still works in the trunk of course, but I dont have a Ski-hatch (or that think LOL)

Thoughts?
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