Can anyone help me out with the rear door speakers? I've tried finding the headphone button/option that I have read in other discussions with no luck! I don't know if I'm just looking in the wrong area or what but I feel like I've pushed every button possible and looked in every menu and submenu on the display. When we are listening to the radio the rear door speakers do not work at all. The 3rd row speakers seem to work just fine. When I switch the balance to the back I can hear sounds from the very back but not the back seat. My kid is keeps asking to turn the radio up and I can only handle KidzBop at a certain level. Can anyone help me with this? TIA!