The supply of water to the rear battery of the Lexus RX400h is a common problem for this car.
To find a leak, you have to open the luggage door and find a vertical weld in the place where the railing stops. The round loads of the seam are burst and the crack starts to increase over time. Through this crack, the water enters the salon between the body and the lining. The plating usually stays dark. The smoked water may disable the traction battery or the vehicle's transmission. If the crack is detected and sealed in time and the salon is dry, you can avoid serious breakdowns. For the owners of conventional petrol RX II, this crack is only wet with a wet mat in the trunk.