Cannot charge the AC

[ArtD14]

First, hello everyone! I've been a Toyota owner for...well, lets just say a very long time. We currantly have a very nice 2012 Yaris with a manual gearbox and about 112,000 miles on the old girl.A while ago while on the interstate a large rock from an uncovered dump truck hit the grill dead center and took out both the radiator and the AC condenser. I changed everything out with new parts. I pumped the system down and it held negative pressure for 15-20 min. Then I tried to charge the system. The system will not take freon. I cannot get a bit of freon in the system. I have been able to charge our 2002 Echo with no problem, as well as a variety of other cars and trucks. I have never had a system not take freon. I have the right equipment and tools and while not the greatest with AC I generally can get by.

So what is going on? I can't find a shop manual anywhere for a 2012 Yaris. Either paper or a CD, and no-where on line either. I have seen on-line where there is a low pressure switch in "some" Toyotas that is designed to protect the compressor. No-one seems to know exactly what models, if any have this switch or what years they came in, or where the switch is located for that matter. The thing is Toyota does not seem to know anything about this mystery switch. Anything anyone can share concerning charging one of these systems will be greatly appreciated!