I've got two problems with leaks in my 2011 Sienna. A few months ago my sons said water was pouring out of the slot where the front passenger seat belt enters the pillar, just behind the passenger seat. I stopped and looked. Boy were they right. It hasn't happened since. Now I've got water dripping on the front driver's side pillar between the windshield and the front door. It drips right where the plastic molding ends. There was a large puddle of ice on the floor. It doesn't seem to have occurred again, but then again, it hasn't rained or snowed since. I checked the drainage tubes from the sunroofs and they are clear, so I've no idea where the water was coming from.