Hello, unfortunately, despite similar threads, I couldn't find an answer to my problem. If it has already been answered, I apologize for the question:

I bought a dashcam from 70mai with the 4G Hardwire Kit. For it to function properly, it requires a constant power supply, a ground connection, and a connection to an ACC circuit. So far, so good. The problem, however, is that this circuit must have 0 volts when the vehicle is turned off, meaning it should be completely off. In my A250e, all circuits (measured via the fuses) still have 12 volts even when the vehicle is off. Therefore, the hardwire kit does not work correctly because it never receives the off signal and thus does not switch to parking surveillance mode.

Interestingly, the hardwire kit does detect when the car is turned off. It turns off but without activating the parking surveillance mode afterward. So it seems to detect a voltage change, but not a complete drop to zero.

I hope the problem is clearly expressed. Maybe someone can help me. Supposedly, there are "switches" that I can use to detect the voltage change and then switch to zero volts?