Change the battery on my old key.

[just-in]

Hi it is me!

If any know me now just to let you all know, things are starting to look up.

But one thing has just stopped working.

My key dose not open the car door remotely, it did work one week ago, but I put it with the mechanic and when I got it back it was not working.

I have another key and that is working ok.

But I do not know how to change the battery on my old key.

Any one knows any thing.

[Quicksilver]

Much of this kind of information can be found on the home page. Why not look over some of the articles. You will enjoy the work that has been done to presant the information. http://www.xoutpost.com/articles/x5/e...ob-bmw-x5.html

[UCrewX5]

The battery is rechargable and it recharges when it is in the ignition. That is one of the main reasons why it is strongly recommended that you periodically use all keys.

[cmyX6go]

Originally Posted by UCrewX5

The battery is rechargable and it recharges when it is in the ignition. That is one of the main reasons why it is strongly recommended that you periodically use all keys.

This is why I love it here! Who knew

Who will be the first to say

[just-in]

Ok but when it is dead is it dead, never to come back?

Cos my dead one was even dead after 3 howers non stop driving.

do you think this will work?

Reprogramming Key Fob

To do this procedure you need to have one working key and one key that needs to be programmed.

1. with the both keys, get in the car and close all windows and doors.
2. Put working key into the ignition and turn to position 1 (the accessories should turn on)
3. turn the key back to position 0 and take key out of the ignition.
4. Using the working key, hold down the unlock button, press the Roundel (lock button) 3 times, and release the unlock button. Doors should lock and unlock.
5. With the new key, hold down the unlock button and press the Roundel (lock button) 3 times and let go of the unlock button. Doors should lock and unlock and you're done!!

Alternate procedure if above doesn't work or if you do not have a working remote:


1. turn key to position 1 five times very quickly

2. remove key

3. Hold unlock button then press lock button 3 times, release unlock button.

4. If you have another key do the same button pressing within 30 seconds

5 turn on igntion to finalize

[JonK]

I've having same problem for the last 9 days and knowing someone will say "we cover this already" I searched every post on remote key, tried, and miserably failed. In my case I have both of my keys not working.

To charge my key battery I made unnecessary a 60 mile trip, and leave the key in position 3 in my garage for 4 hours and nothing worked. My conclusion the battery is dead beyond repair.

Can someone give me a real solution?
I am taking this car in to a dealer Monday. If they cannot fix it, I might walk out with Lexus, or MB.
It pains my to reach the button in near the tranny shifter to get the doors for the passengers, bad example on usability.

[JonK]

I took the car to the dealer on Monday. The service rep tried to reset the key as the description above and failed, haha. He also checked the fuses and they checked out okay. The rep says there's no battery in the key unlike what was discussed above, only a microcessor, and I asked "then a capacitor?", he said "Yes."
Jason Giambi, yes relationship with the slugger that's his cusin GREAT MAN, with Valencia BMW took the car for the half day. He called me to inform me the both keys were fixed. I asked how, he says they reprogrammed the keys using the dealer computer. I also asked, "what would be the logical explanation for what happened." He says, "dunno."

I wish I had diagrams to show you hwo this works. But there's no battery to die. Take your key to your dealer, I hope you are still in warranty. EOF.

[noncom23]

Usually works.

Originally Posted by just-in

Ok but when it is dead is it dead, never to come back?

Cos my dead one was even dead after 3 howers non stop driving.

do you think this will work?

Reprogramming Key Fob

To do this procedure you need to have one working key and one key that needs to be programmed.

1. with the both keys, get in the car and close all windows and doors.
2. Put working key into the ignition and turn to position 1 (the accessories should turn on)
3. turn the key back to position 0 and take key out of the ignition.
4. Using the working key, hold down the unlock button, press the Roundel (lock button) 3 times, and release the unlock button. Doors should lock and unlock.
5. With the new key, hold down the unlock button and press the Roundel (lock button) 3 times and let go of the unlock button. Doors should lock and unlock and you're done!!

Alternate procedure if above doesn't work or if you do not have a working remote:


1. turn key to position 1 five times very quickly

2. remove key

3. Hold unlock button then press lock button 3 times, release unlock button.

4. If you have another key do the same button pressing within 30 seconds

5 turn on igntion to finalize

[WolfX5]

Logic check guys...OF COURSE there's a battery inside the key . Any radio transmitter needs a power source, even the weak 315mhz transmitters inside a BMW key fob (not that you'd want to destroy your $150.00 key just to get to it mind you, but yes - there IS a little battery inside in case you were wondering). A capacitor is not a subsitute for a constant power source, and would simply not have the reserve capacity to repeatedly transmit without being recharged after each use. Try locking/unlocking your doors a dozen or so times and you'll see what I'm talking about...

[JonK]

Originally Posted by WolfX5

Logic check guys...OF COURSE there's a battery inside the key . Any radio transmitter needs a power source, even the weak 315mhz transmitters inside a BMW key fob (not that you'd want to destroy your $150.00 key just to get to it mind you, but yes - there IS a little battery inside in case you were wondering). A capacitor is not a subsitute for a constant power source, and would simply not have the reserve capacity to repeatedly transmit without being recharged after each use. Try locking/unlocking your doors a dozen or so times and you'll see what I'm talking about...

Now I am very tempted to crack my key open. Perhaps I am killing a goose laying golden eggs?
If you mean battery as something separtely replacable, perhaps not, like old remote. They're many chips out there not requiring those, i.e. My HOA fobs...
Mobil express fob, I don't know the exact name, some smart cards. They don't need batteries... If anyone know the details let me know. I am curious to know.