We have 17000 km and our Sienna is 9 months old and just happened that it would not start…had it towed to the dealer and they said it was the battery. Why now? They turned off the sensors and have called Toyota as they have had some problems with sensors draining the batteties so they said.We have about 8000 miles on it and all the sudden it has been not starting.. I go out open the sliding doors with the button; so they auto open just fine. Put my kids in. Go to close the doors; by the button and it won’t close. Go to start it lights and sounds but won’t start. The dealer replaced the battery earlier this week then it happened again. They kept it this weekend and I am going to go back and fingers crossed they find something but I’m afraid they won’t. We have been through making sure no lights are left on and nothing plugged in. We have also stopped keeping the key fob inside the van because the dealer believed that could cause an issue. I disagree with that though because we leave it in the car because we have a garage and have done that ever since we got it and never had an issue until recently.