I don't recall the relay setup, but the solar power circuit in a D2 totally bypasses the hedgehog and all other controls and basically just connects the panel straight to the fan motor.
It really is a simple setup; I think Ian (IT) documented the retrofit here long ago.
I only really looked at the circuitry in order to fit a cutoff switch, which I placed in the earth side of the solar panel circuit. Easily accessible around the front passenger footwell.
My (failing) memory says that I thought the relay was actually in the HVAC unit, but it may be that it's an external relay and the HVAC controls it.
Either way, the D2 relay is in the more complex +ve circuitry, which is why I went for the solar earth for my switch.
I would expect (hope) that the D3 didn't "reinvent the wheel" so follows a similar pattern/logic.
My fan motor problems (currently not manifest) were equally evident in either mode by the way.
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2003 D2 FL S8. Irish Green Pearl/Beige. Solar sunroof, auto-dim mirrors, electric rear seat functions, ski hatch retrofit; extended leather. Aftermarket DVB-T, reversing camera and full XCarlink (Bluetooth etc.).
2016 Volvo V40 T5 Cross Country (4WD) with ALL the toys including adaptive cruise etc. etc. Osmium Grey with Blonde/Charcoal leather interior. Polestar performance "optimisation".  (A much rarer model than a D2 S8 by the way!) Oh, and a brand new engine at just under 30,000 miles on the factory one! 
Finally: gone, but not forgotten.....
1998 D2 PF S8. AgateGrey/Platinum. Every option (I think) except electric rear seats, tiptronic steering wheel, ski hatch, towbar & dimming door mirrors.
e.g. Cruise control, NavPlus/TV, Bose, GSM, Xenons, Solar roof, Parking sensors, Alcantara/leather everywhere of course.  (internal dimming mirror added later)
1998 (very early) Ford Focus 1.8 Zetec; ABS/TCS, Heated screen/mirrors, Aircon, Auto-dim mirror, Leather, Trip computer, Cruise control, OEM Ford SatNav with CD changer.
And before that a lot of Rover 800s, a few oddities, a lovely Triumph Dolomite 1850HL with Overdrive and way back in my schooldays an Austin Seven aka Mini 850!
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