I was generally under the impression that pin codes were independent of AP discounts. It perhaps is more likely that you get pin codes if you also have an AP.
For the SWW trip we just had, when I called to book it room only, I asked if I had a discount code. I have never, ever been told I have one, so I said as much, but that I was a
DVC, AP, and Disney Visa holder, so if anything would apply, I was all for it. He looked, and came up with a 40% pin code valid for the days of the trip.
He also tried to apply the same code to the other trip I also had booked (had a couple of weekend days booked at POR), but it wouldn't apply because it was blacked out for some reason.