X5 E53 - On board phone not working

[maxandfriend]

Hi all,

I'm seeking advice as my facelift 2004 X5 phone stopped being aware that the sim card (europen gsm) is already inserted in the slot and keeps asking for it.

It started about a year ago with some occasional failure in recognizing sim card and then it went worse till now which doesnt recognize it at all anymore.

My phone is this and this.
I did already try to investigate the matter and had a try to:
- change sim card.
- put the card directly in the slot on the TCU (it usually sit in a slot on the armrest, but TCU has another one).
- Reset the whole phone by disconnecting car battery.
- Check the cable for pin to pin continuity between main unit and handset.
- scanned it with Navcoder (registered) and it didnt show any fault code.

BTW, the phone connects to the net and correctly works (had a successfull try in making an emergency call which doesn't require the sim card to work)... just doesn't recognize the sim, so I'm not allowed to make or receive any other call but an emergency one.

Is there anything else I can do or check to get it working again..?!?


As a last chance I found an used TCU on ebay but I'm not sure if it will fit on my car... the code is 84.11 6942591-01 and here it is.
Codes look compatible, but the new one doesnt show a BT code (PK) on the sticker.
And again... if I'm going to swap TCU, my old handset will be able to recognize the new unit and pair..?

Here is my old TCU (OEM code 84.11 6938763-01):


...and here is a pic of the one I found on ebay (OEM code 84.11 6942591-01):




Sorry for a long post... and thank you in advance to whoever will be kind enough to lend me an helping hand..!

Max


p.s.
Sorry for my english, but I'm from Italy... so, if something is not clear enough, just ask and I'll do my best to get it more understandable. Thx again.