Starter Battery Drain; How to stop ECU's etc from consuming battery when door opens?

[Quartermaster]

- I constantly hear a high-pitched beeping sound from a control unit

-> When this occurs, the SOC has also dropped significantly. SLEEP mode does not seem to work here, but the question is which control unit

I have the same and described it before somewhere here. I noticed, that this does not occur when i turn the ignition on again for a second after shutting down the engine.
I don't what is causing this, i would call it a high frequency Sound, barely noticable.

 

[stegelkamp]

I have the same and described it before somewhere here. I noticed, that this does not occur when i turn the ignition on again for a second after shutting down the engine.
I don't what is causing this, i would call it a high frequency Sound, barely noticable.

Hi, thx for your answer. so much content here....

I also can notice this high frequency sound even unlocking the IG... very strange. may a find the time to identify the area and other things around this.