I'd say that's definitely a 'wire up' for an optional extra which you don't have installed on the car :smile: unfortunately I would have no idea which extra that is...:iono:
Most makes actually fit the full array of wiring looms to all the variants of a particular model and then just wire up what the individual car has installed.
I've stripped alot of my previous cars for various DIY installs and found this to be the case with all of them