Simple "thing". Changed the battery in my key fob. For some odd reason, when the battery gets low, the fob will partially function. Lock, rear hatch open, and panic all worked, but unlock would not. I thought there was another issue with my driver's door wiring loom, but couldn't find any visible breaks or cracks. I put up with this for a few months. Then a member here responded to a question for me, suggesting I check the fob battery. Sure enough, when I used my backup fob, the unlock function was working. New battery in my more heavily used fob, & I'm back in business. Now I can just be bothered with what splash screen & wallpaper to put on my new head unit.