Hi guys hope this helps,
I have 2011 AB TDV8 which has socket in boot space already, so I ordered trailer kit which contains plus for said socket & loom to 2x 7 pin trailer sockets (12n & 12s).
So I only need 7 pin and set that up according to instructions provided & terminated exposed wires for 2nd socket (may use these down the track for caravan).
So I proceeded to test each pin on socket I need and all pins checked ok except reverse, there was no voltage here!
A bit of research reveals that with the use of iid tool I can activate that pin, I think it is to let vehicle know that trailer is connected, therefore active dynamic suspension can sense loads for height & sway control. I have not yet been for drive with trailer to verify this but will update when I have.
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