Hi friends!

Just a quick sum up before closing this thread. Will post a dedicated subject once my problems get definitely solved.

After a lot of search, my mechanic and me came across the hypothesis of a failure of both the SKREEM and the RCM.

One for the Remote fob not working, the other for the Instrument Cluster powered on but no start.

Turns out there was even more (lol), as the previous owner installed a "no antilock" device inside the ECU.

I had to rely on the deep expertise of @Viper-666 who successfully and quickly sent me another, working SKREEM with another ECU.

And for additionnal security, I purchased a new RCM from Mercedes (237€ with VAT), to replace what seemed to be an already replaced RCM from 2018.

Situation is very fine, FOB works locally and remotely, my XF restarts like a charm, either cold or warm start there's no issue anymore.

next stop : regaining the TPM, cruise control, and solving some CAN generic errors that pop up from time to time.

Thanks to all the enthusiasts involved in the thread!!

PS : the new alarm part is A 219 820 32 2664, you'll need an additionnal bolt (different stick mechanism) but overall the alarm seems to be pretty much the same. costs 183€ VAT included, which is f* yuge