Remote Locking not working

[UK_3.0D Sport]

Hi all,

I have owned my X5 for about a month and the remote locking has never worked. I have just joined the forum today but have been reading it for the last month.

So locking wise everything works with the actual central locking either physically with the key or the locking button by the hazard switch but there is no response to any of the key presses.

I have tried every version of re-syncing I can find to no avail. I have swapped the GM3 (I think it's called) behind the glovebox. I have probed the amplifier in the rear hatch on pin 3 and the voltage changes when the key buttons are pressed.

Hoping someone can point me where to go next..

Thanks,

Steve