Dead key

[Chad]

Hi, anybody changed battery on Csl key mine has died, or is it just a new key from dealers. 🤔

[CraigMillwardCroft]

Hi, anybody changed battery on Csl key mine has died, or is it just a new key from dealers. 🤔

What won't it do mine has never failed.

[azrael]

They charge when in the ignition, so good to switch keys periodically

[cslsuperfan]

They charge when in the ignition, so good to switch keys periodically

Remember being told this 10 years ago and couldn't believe it

Bloody clever them gerries!!!

[Chad]

Key dead

What won't it do mine has never failed.

Hi Craig Keys no longer locking doors on button, have to use key In lock, will change to other key, not used that for some time maybe that will charge up,but sure that has gone the some way, as azrael & Ben said I Remember BMW service telling me they charge in ignition but thats not working now, was hoping you could fit new battery, BMW say you have to get new key, i like to do my own repairs and services when I can,don't want a f..ing battery to beet me ��

[Bounce]

New key I'm afraid,you need to swop keys now and again to keep them both charged as said above.

[Chad]

New key I'm afraid,you need to swop keys now and again to keep them both charged as said above.

If my memory is correct not much change out of £200 for new key Chad

[Bounce]

If my memory is correct not much change out of £200 for new key Chad

Yeah,I think £150 odd for key then needs to be coded in,unless you can do it yourself

[select]

I am sure you can just replace the battery and dont need to replace the whole key :smt101

there are lots of youtube vids on that topic. I would try that first, as a new key from bmw certainly wont be cheap.

[philj]

Same thing happened to me. Key just needed recoding. Elms sorted it and it wasn't expensive.

[Monkey]

I am sure you can just replace the battery and dont need to replace the whole key :smt101

there are lots of youtube vids on that topic. I would try that first, as a new key from bmw certainly wont be cheap.

You cannot replace the batteries in these keys I'm afraid. Well thats not strictly true, but you'll never get the key back together again.

If it starts the car, and its just the remote that isn't working, carry out this sequence

1.Unlock the car with the good key.
2.Get in and shut the door.
3.Switch the ignition on.
4.Switch the ignition off.
5.Remove the key.
6.Push and hold the unlock button.
7.Push the lock button 3 times.
8.Release both buttons together.

The doors will lock and unlock if initialised correctly. Repeat steps 7 and 8 immediately with the other key, they need to be initialised together.

The key needs to be used for approx 1.5 days a year to retain its charge. Hope that helps!

[Chad]

Dead key

You cannot replace the batteries in these keys I'm afraid. Well thats not strictly true, but you'll never get the key back together again.

If it starts the car, and its just the remote that isn't working, carry out this sequence

1.Unlock the car with the good key.
2.Get in and shut the door.
3.Switch the ignition on.
4.Switch the ignition off.
5.Remove the key.
6.Push and hold the unlock button.
7.Push the lock button 3 times.
8.Release both buttons together.

The doors will lock and unlock if initialised correctly. Repeat steps 7 and 8 immediately with the other key, they need to be initialised together.

The key needs to be used for approx 1.5 days a year to retain its charge. Hope that helps!

Hi monkey just tried to initialise keys ,not worked, That has worked in the past. will try sledge hammer see if that does the job. chad🔨

[nw942]

http://www.bmwforums.info/3-series-guides/7863-bmw-e46-key-battery-replacement.html

[select]

Ok thanks guys for clarifying. Seems like i was mistaken.

I now shall be using the secondary key from time to time.
Hope it still works.. haven't used it since 2 years.:smt022

[NZ_M3]

You can charge the key on an Oral B electric tooth brush ring charger. It works via induction so the same principle as your electric tooth brush.

Just make sure it's the older style Oral B charger that's an "0" shaped base. Put the diamond side of the key in there and leave it for about half an hour. Should be as good as new.

You can cut the key plastic open and resolder a new battery on - many available on ebay, but you will not be able to glue the key back together as before. So just buy a copied diamond blank off ebay, get it cut at a lock smith and put the newly soldered battery IC board in the new housing and glue it together. Presto, brand new key and battery.