Before working on the loom / wire harness, I propose to check first KVM module and receiver for unlocking via remote control.
The receiver is located at no. 1 on this page: #12
Is there maybe water entry by the antenna connection, or bad connection at all?
In another thread a member found out how to set "ignition on" for the BCM with an additional wire at the BCM connector.
Reason was to get "ignition on for frogramming with Forscan" for a car without a real key.
Maybe with this "ignition on" you can check if you can reach the KVM. If not, I assume that the KVM has a breakdown.
In #37 it's told that it was pin 15 of C connector (blue one).
Good luck!