Anyone know what this wire feeds?

Carp catcher

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Whilst I was fitting the puddle lights at the weekend, I had a SOS (silly old sod) moment.
The instructions from Saxoboy said in the bunch of wires going to the door catch, t tap into the brown black wire.
I, for the life of me couldn't se it. So I read down the puddle light thread, & saw that someone else had the same problem & connected into the yellow brown wire, the wire in the centre of the bunch.
I should have read a bit further, because in another post they said they immediately lost the DAB signal. This is what happened to me.
Anyway, next day I had another look & did se the correct brown black wire. I connected into that wire & DAB signal came back. However, now when I open either door, I loose the signal for a couple of seconds.
I think I may have damaged the cable slightly, so need to cut it & re join it.
Does anyone know what it feeds & if it is safe to cut without blowing something?IMG_0058.JPG
 
Brown/yellow in the passenger door is from the BCM to the central locking motor
 
Thanks for the response.
Do you know why that wire would affect the DAB signal, & what would be the best waybto repair it.
I am slightly concerned now you have mentioned the BCM?
 
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