Get to the DDE controller, it is under the hood of the car on the left side, on the windshield (when you are facing the car).
Unplug the plug and check the pins to see if there is 12v on the plug when the ignition is on. This may be an issue with the weight of the controller itself. If you have 12v on the pins, the controller is damaged. If it is below 12v, the problem is the ground cable going from the controller to the body.
In my first post on the topic, you have a link to a photo of the pins and you need to connect these pins with a multimeter from the side of the cube. And in the second one I have added a photo of the cable I am talking about and what problem I had.
Of course, close everything tightly again later. Also make sure that there is no water under the controller in the box in which it is mounted. Because I have already seen cases where such things happened.
Generally, these controllers tend to get damaged when simply replacing the battery.
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