I have this issue occasionally in my 2014. I purchased a new one when it first went out (and I may not have needed to). The new one worked fine, but then from time to time it goes out, sometimes entirely or just the rear will work. Pull the module out, unplug the section that isn't working and plug it back in. See if that works. I have no idea why this happens occasionally as the plug is never loose and is always properly seated. But this fixes the issue for me every time for a couple months. However, I didn't replace an entire door, so it could be something downline in that door, inspect as well. A quick unplug and re-plug is worth a shot anyway.