AC control problems
 

I have a 2005 G35 sedan.

My AC has gone in spouts where it controls itself lately. Every now and then it will be ok but most of the time, the buttons don't work and the AC turns on full blast.

I have an an aftermarket kenwood dnx 1560. I had to get the adapter so it would fit in the car.

I saw a similar thread to this that was placed recently but it seemed like in that one, the guy was having trouble with the radio controls as well. This is not the case in my situation as the air is the only problem.

Any help would be great!