AC auto turn on and won't turn off

The climate and radio controls depend on the radio power supply to function. If your radio starts to go bad the climate control will default to automatic setting.

In addition to your problem, my radio did not work. Brought it to Infiniti dealer said: The radio needs to be replaced and that the wires that control the a/c controls run into the back of the radio. I am having the work done right now,so I hope this helps.

I have the same problem, took it to the dealer and it was a fried circuit board. They are repairing it now.