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General E46 Forum
This is the place to get answers, opinions and everything you need related to your E46 (sedan, coupe, convertible and wagon) BMW!

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Old 06-05-2009, 02:28 PM   #41
Elusive
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OP, great write up on the DIY, one thing to add that I tried, I was trying to reinitialize my key since it had stopped working, I have all 4 of the keys that came with it so I had another "master" key, it wasnt working to do the reprog so I thought, ok new battery, used your DIY and opened the key, you mentioned patience, a lot is required!, once I had it open I thought ok, so what about trying to prog it with the board out of the case, did the reinitialize steps and it worked! Saved the battery time, hopefully it keeps working, but for now, it does. So once you open the key try to program it again with just the board, I thnk mine was getting a bad button push so just doing it without the case made all the difference, but again, OP great DIY!!!

Thanks
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Old 06-08-2009, 03:16 AM   #42
DBeemerphileWnaB
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Can any locksmith (I am not counting the idiots at Home Depot) cut the groove in a duplicate blank key? Or does it require a specal dealer-only tool or resource?
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Old 12-24-2009, 11:00 AM   #43
mobes
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Thanks benmuellerb for the write-up!

I ended up following djarndtsfo's technique and swapped in a CR-2025. Works great!
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Old 12-24-2009, 11:03 AM   #44
mobes
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Quote:
Originally Posted by DBeemerphileWnaB View Post
Can any locksmith (I am not counting the idiots at Home Depot) cut the groove in a duplicate blank key? Or does it require a specal dealer-only tool or resource?
Good ones can. They are commonly referred to as "track keys" so call around and ask who can cut "track keys".

I've read that some Volkswagen dealers can cut the grooves as well.

Don't forget though that we also have a transponder and the key may get you in the door once cut but it won't start the car unless it's coded to the DME.
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Old 09-09-2012, 09:19 PM   #45
BimmerBloke
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Horiz or Vert

Several people on the thread asked if they should buy the Horizontal or the Vertical battery.

This forum has saved me a fortune over the years, so I decided to take one for the team and buy both. Mouser still has the best price in the USA.

Here's a photo I took of the two variants:


While you can make either work, I found the Horizontal to be best. I used a solder sucker to remove the old battery, then soldered the + terminal of the new battery into the board and bent the - terminal around the battery. I attached a wire from that terminal to the board (shown in green).
The key immediately worked, I didn't need to reprogram it.
My thanks to all the contributors to this thread, especially benmuellerb.
Doug

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