I think Facelift had potentially other options, such as auto-dim so it may not be very relevant.
Difficult to photo, but the glass is off so I'll describe the wiring as best I can:
Part label: 4D2 858 531 (+other number groups) 04.05.98
Captive socket that plugs in as unit is mounted: 7 pins of 10 (2,3,4,7,8,9,10) wires not accessible for further info.
Socket on fly lead: 7 pins of 10 - 3 of 4 outer large ones, 4 of 6 inner thin ones. No numbering visible, all 7 have wires on. I THINK this lead goes straight through the hinge mechanism to the mirror motors.
6 separate thin leads also appear through the hinge inside the unit, presumably from the "captive" socket:
2 black leads that appear to be for the heated mirror glass.
2 further black leads that loop back behind the glass to the outer side of what I think is probably the "folding" motor - can't see where they terminate.
Red & white leads that enter the inner side of the (presumed) folding motor.
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