I can't say that the schematic/wiring diagram issue is what made me dump the POS (and that doesn't stand for Point-Of-Sale) I had, but it sure helped weigh in on the final decision. I tried to get the diagrams too, and my dealer and I got the same runaround as everyone else.
I had the POS for 6 months, and 5 (count 'em, FIVE) of those months was with it sitting at the dealer, waiting on authorization for them to proceed with my 6-page gripe list. GS refused to honor it, saying the dealer was padding the list. We finally took it to the factory and they worked on it for 2-weeks solid. Never did finish with it, when I threw in the towel and traded for something worthwhile.
Anyways, back to the question at hand. Several have suggested here that it may be GS is trying to keep the 'precious' information out of our hands because we might do some repairs ourselves and cheat the dealer out of their fair-share. Well, I don't follow that, since GS is keeping the info away from the dealer too, and then the dealer charges the time back to GS (if it's under warranty), and GS ends up paying anyways. Be cheaper for them to release them, like Winnie or the others.
I'm more apt to believe it's because of the replorable shape of the documentation in the first place. The dealer did show me a diagram (original was in pdf-format) he'd gotten from GS several years ago when tracing another wiring-issue, and GS was more open. OMG, a 6-year old kid could have done a better job! It was awful, as if someone was doodling in their spare time. And this was supposed to be a 120vac circuit to something non-lethal, simple and inexpensive like an air-conditioner? Made us wonder about how the rest of the stuff must look hidden away in Nappanee.
Sorry, but if this is how they treat and view the 'outside world' it must be a very interesting world they're in. And I for one, am disappointed to say that I'd bought into it (if even for only a while).