Each time I park my Mercedes Benz w202 over night. What I discovered next day was a flat battery the car would not start again.. I run scan on the said car no solution yet...
MercedesMedic 1 week 5 days ago
A scan is not going to show anything. What you have is a system not going to sleep and draining the battery.
You need a multimeter that can measure current draw. Then pull one fuse at a time and check which system is drawing over 0.3A.
Start with the audio gateway. If not that check the rest of the circuits.
MBFanatic 1 week 5 days ago
Check out this video on how to find a parasitic darw.