Thom Blair

My first post. I have stock DL3 wiring. Bought a used 2009 2500hd. Are the mirrors supposed to power fold? I don’t hear anything and nothing happens when I press the buttons. The switch has 3 plugs, all plugged in. The manual says something about manually folding and trying again if they don’t work. Do I need to repair something? Do I need to replace a fuse? Or am I just misunderstanding about these being able to fold by pushing a button? Thanks!