I have a 2011 Dodge Grand Caravan Crew. I seem to be having issues with me rear sliding doors. My passenger side rear slider does not seem to lock, I can go into a store, come out and my door is wide open. It appears that maybe the proximity sensor will just open even if I am inside a building. Now my drivers side rear slider, when I unlock the doors emits a loud buzzing noise. It happens with the car running or not, but anytime you hit the unlock button from the front door panel or the key fob you get this loud buzzing noise.

Does anyone have any ideas of where I should start?

Thanks,
ChellLvng