Assuming it's the same as an Acadia (and I'm sure it is), You can set it to be in sync with the front. You cannot manually control the rear zone separately from the front, however. You CAN pretty easily reach the rear controls from the front though, as long as you memorize which buttons do what so you can do it by feel 
We actually do this with the rear audio controls from time to time.
We actually do this with the rear audio controls from time to time.
