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Hope this comes out well, I'm posting from my phone.
Will start with the AHV module wiring as this is same module across all years and models.
Pin 1 White/Blue 1.5mm2
Pin 7 White/Red 0.35mm2
Pin 9 White/Green 0.35mm2
Pin 10 White/Yellow 0.35mm2
All go to the actual swinging motor part of the towbar, plus a Brown Earth coming back, to be grounded inside the car.
Pin 12 White/Brown is tailgate contact switch, you'll find this at the tailgate lights.
This enables the operation of the towbar when tailgate is open.
Pins 5,6,14,15 all go to the towbar extension / retraction button as you say. Simply connect like colours.
Pin 11 Green / Black is ignition on from CAS. Pin 10 X13376
Pin 2 is main power F10 15A in junction box
Pin 4 is contol Unit Earth
Pin 13 loops to AHM module and provides a coded signal for evaluating the hitch position.
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