Are USB Ports Inactive when car parked?
#2
Senior Member
I think all all the accessories work ONLY with they key on position II (park the car with key on position II will work on the radio & other accessories, put to the limit depend on the battery). my 2012 ML350 the accessories (radio, SD card, DVD video work up to 25-30 minutes, then turn off, my wife 2012 E350, the accessories work only 10-20 minutes then turn off. I asked my SA @ MB dealer, he said that the power management of the car turn the accessories off to save the energy for the next start, otherwise the car cannot start with a dry (empty) battery.