what year is yours? neither of mine work not sure what it could be??
dunno... how can u tell?
Brown is typically earth, and that is almost certainly the earth wire from the door control unit to the earth point down at the bottom of the A-pillar.
The electric mirror wires will all be within the door, there's no reason for them to come out through that cableway.
The red/brown twisted pair is a databus - not Can-Bus, it's too early for that (and the wrong colours) - connecting the drivers control unit to the control units in the other doors.
The drivers side mirror will have eight wires coming out of it to an eight-way connector on the door control unit, if it has electric fold. Only five wires if it's manual, and three if it's not heated.
Lee's list of fuses in this thread should help. Shows fuse 27 for the rear wiper.
There is one fuse for mirror heating, but no separate fuse for the mirror fold.
The door control unit is attached to the electric window motor. Have you had any work done on the drivers side electric window, or had a replacement winding motor?
Damaged earth wiring isn't a good idea - I'd get that repaired if you can.