07 R320 Diesel battery drain
My radio can be powered on without even starting the car if I push the button at anytime even without the key in the ignition, I just have to open the door and I can push it on.
I've tried to pull the #25 fuse and have taken off the negative battery terminal to reset this but can still turn the radio on at anytime.
I was wondering if there was a relay or something to stop this, and where it would be located or if anyone knows of any other reasons the battery can drain in this type of vehicle. I would really appreciate it.


