2012 GMC Acadia Owner's Manual - Page 112

4-2 Storage Armrest Storage Center Console Storage Vehicles with a rear seat armrest have two cupholders. Pull the armrest down to access the cupholders. Pull up on the lever, located on the front of the center console armrest, to slide it forward and backward. To open the armrest storage area, press the button located on the front of the armrest. There is additional storage under the armrest. Move the armrest all the way to the rear position then slide the storage cover back to access.