Felicia Drake

I'm having a problem with my power locks in my 2009 Journey. When I press the lock button on either the driver or passenger side, all of the doors lock, but only the driver door UNlocks. The only way to open the other 3 doors is to do so manually, but I don't believe there is anyway to manually open my lift gate, which is rather inconvenient. Has anyone else had this problem, and hopefully be able to point me in the right direction? Any help is greatly appreciated!