Just repaired one like this today, is the heatred rear window not working either and are there any other faults?
It's most likely to be a K-bus issue with a module if you have a FBH then try disconnecting it see if the fault disappears, if not then it's a case of disconnecting one by one the modules connected to K-Bus
If that doesn't work then it's likey to be corrosion inn the K-bus header under the carpets were all the wires from the various modules join this often happens if the carpets have been wet for a while
In todays case it was a bit more complex there was a K-bus controller problem caused by the FBH but some numpty had tried to resolve the issue by cutting the K-bus wire at the IPK and LSM and joining both of them together effectively isolating them from the rest of the system. End result no Sat-nav, ATC instant ERR message on selecting A/C, door s would only unlock on remote.
All issues solved upon rejoining the cut wires and unplugging the FBH plugs
Russ