Battery at 2nd ride after car wash empty – my guess is damaged cable insulation

Hello @all, someone has an idea, where in the course of the car wash with the Renault Megane Scenic 2 Exception BJ 12.2005 can enter the body everywhere so much water, so that possibly with defective cable insulation a bridging can occur? Before another info the problem: My problem looks like this: First I was in a wash road and had a ride of about 600km 4 days before. With this ride the battery should definitely be fully charged. A knap The problem with the rear flap no longer occurred, but now also about 1 week later there are problems for 2 days with the unlocking sensors. The vehicle can be unlocked by means of the remote control, but the sensors attached to the door handles no longer work. (How far this can be related to the other problem.) , unfortunately I don’t know why I wanted to mention this.) Does anyone have any idea if it will be due to a damaged cable insulation, where the electricity from the battery will be discharged via a bridge through water in the body or will be something else? I thank you already in advance for your suggestions. EDIT: In case of light to moderate rains of the last time there were none of the described problems. LG Matze202