update I did buy the Woyo Tester, and I confirm my BMW key does not make it show any number.

But for my garage opener when I press a button it shows a random number (the number changes each time I press it, is that normal?)

and I have to say the Woyo Tester just randomly shows numbers even when I dont press anything. but when I have the garage door opnner click next to it, it changes same time as I click so I know it works.


so now that I know the problem is the remote, what should I do ? is there a link to follow to replace the battery ?

another update,
I was able to get the Lock Button emmit a signal (on a flaky manner) and (like if I long-press 3-4 times) and it shows "314.8" one or two times of it.

however the open and trunk buttons do not send anything at all.

X5 e53: can unlock with central lock button but not with remote
 

Sounds like classic button switches broken situation. Order a new key from the online dealer and save like $60.

I nursed broken keys back to function a few times before replacing the key (only to total the car using a deer months later). Was a very happy time with properly working key though!

It's really *never the battery*. Find my thread on key/battery. I show how to poke pins through the key to measure battery voltage. https://uploads.tapatalk-cdn.com/202...80a3c6bfc2.jpg


https://uploads.tapatalk-cdn.com/202...ee8d67b5b5.jpg
Actually I found the pictures. Red is positive.
https://uploads.tapatalk-cdn.com/202...ed0bfe3d8e.jpg
While charging at 20 mA the voltage climbed to 3.6v ish but not charging was close to 3 and dipped appreciably when a button was pressed.

If no voltages dip when pressing a button, the switch is not working or a solder joint has failed. It also makes impossible to sync with the car and will lose remote functions.

where is that online place to order keys? on BMW website it says to call a number

An alternative, if you're not in a hurry, is to order a cut key from Aliexpress. Probably more than one option, I used this one:

https://www.aliexpress.us/item/2255800045851419.html

About $15 cut, make sure your pictures are clear and be prepared to use a wire brush to smooth out the rough edges. Mine was hard to insert before doing that and adding some lubricant. The BMW logo for the center button came inside the keys I ordered.

If you're concerned about someone in China having a picture of your key, have a friend order the key to a different address for you so it's not tied to yours.

Then you need the AK90 programmer and a PC to program the EWS module, which must be removed from the X5. Several videos on YouTube about this procedure.

About $20 for the programmer.

So $35 for the first key and $15 for any subsequent ones. Probably best to do two at once at that price, since removing the EWS module and doing the programming will take some time.

ok I have a bad news :(
I changed the battery, using this https://www.ebay.com/itm/183640986098
and I repaired the key, but now I can not even start the engine with it anymore (it wont open the doors either)

what can I do to be able to start the car again?

any link for the programmer ?

also with the new battery the Lock Button emits a Frequency to my tester, but unlock and trunk buttons do not emit any frequency.

I have an odd question, I have an Old BMW e46 Key (that has not been charged for 10 years) but if I put the battery in to that one, can I pair that one with my e53 ? and can I attach the Physical metal key from my e53 to the board from E46 that had been programmed to a different car in the past ? (or is that impossible)