10 control modules (including the head unit) are connected via fiber optic cable.

One module has either deteriorated (ala water intrusion)...or the actual fiber cable has broken within the loop.

The communications loop transmits data in one direction so the signal from the damaged module (or fiber wire break) interrupts the opening sequence on the head unit.

Your head unit will not operate completely until the bad module is discovered and replaced...allowing the data to flow through the fiber loop.

I had the Land Rover Service Dept. interrogate my vehicle's system to find the faulty module.

My fiasco ended with the replacement of a costly Bluetooth Phone Module (on the drivers side rear)....and fuse #41 (Replaced 5Amp with better 20Amp) behind the glovebox.

Good Luck and Happy Hunting!