No power at HVAC control panel?

Okay, I've narrowed it down to a couple of connectors. This connector I310 is a bulk connector in a place that can possibly be exposed to moisture intrusion, down by your left leg as in diagram 1. It has the power feeds to the Hvac Module, Humidity sensor, In-car Temperature sensor, plus an Ignition switch feed, K Line network, CAN C Bus Network Low side, for the Keyless ignition Node Module and Radio Frequency Hub Module (for remote start). I don't know what else runs through this connector, so I wouldn't just pull it apart, It may have SRS (airbag) wiring running through it. And you don't want to set any of them off. But this connector may have corrosion inside of it effecting some pins and causing voltage drop across it. (Diagrams 1 through 4)

The 2nd possibility is a Ground G212 although it doesn't explain the 9 volts reading. Its Ground for the Hvac module, humidity sensor, In-car temp sensor, And the Keyless Ignition Node Module. (Diagrams 5 through 7).
I found a bunch of safety recalls I'm going to post as well.

Okay, with the 9-volt issue, I think checking the Connector I310 first would be a good idea, If you had a bad ground to any of these modules, you would still have a 12volt feed depending on where you were using for ground with the meter. The 9 volts makes me suspect a connector issue or splice, but since you are now having issues with the remote start, which runs through the I310 connector too. The network in this truck is pretty complex, but it's tough to say exactly what's going on since you have 12v at the hvac module, The last page above is the verification for the hvac module.
At this point I would try erasing all the codes and see what comes back right away. You can also try the wiggle test with that connector and see if any hvac control comes back. It's the one connector that ties all the issues together, my next test would be to de-pin the CAN bus network pins out of the hvac module and keep it powered up by check if a signal was coming out of the module itself, that way none of the network would be connected and you could see if anything was coming out of the CAN bus pins. I assume you have tried erasing the codes after the new modules were installed. And by the way there are 9 safety recalls I have for you. Pages 1 and 2 go together, and 9 and 10 go together. These are Safety Recalls, that's why I am posting them, if they were regular recalls I wouldn't be as concerned.

Okay, if that's where the issue was, and there was no corrosion, then it's a pin fitment issue on that connector. Normal vibrations from driving and the engine can cause things to loosen up over time, if the issue shows up again go right to that connector and see if the female pins are spread or loose at all. They're probably small pins, communication pins usually are since they carry very low current. Glad it's working for you though.

This is an old post from almost a year ago, and his codes were U0164 and U1190. His vehicle has a different design then yours does. We would need all the vehicle information to begin with. I dont see an connector i310 for your AC Heater Module and In Car Temp Sensor, it looks to be i311 possibly in your vehicle, but you are better off to start a new post with your question and the codes you are getting. Add year, make, model, engine size, turbo or non turbo. That way this issue can be addressed correctly. The wiring colors are most likely different as well. I know its only a 2 year difference, but technology is advancing faster each year. Start a new post and someone will be able to help you with a fresh start. This case youre posting to was very complicated. We are instructed to have different vehicles to start a new post.