Trailer power supply
The trailer socket of your vehicle is equipped at the factory with a permanent power supply. The permanent power supply is supplied via trailer socket pin 4.
You can connect accessories with a maximum power consumption of 240 W to the
permanent power supply. You must not charge a trailer battery using the power supply.
The trailer's permanent power supply is switched off in the event of low vehicle supply voltage and after six hours at the latest. You can obtain further information about installing the trailer's electrical equipment from a qualified specialist workshop, e.g. an authorized Mercedes-Benz Center.
See also:
How the occupant classification system works
The Occupant Classification System (OCS)
categorizes the occupant on the frontpassenger
seat by means of a weight sensor.
The front-passenger front air bag is
deactivated automatically for cert ...
Overview
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Activation conditions
You can activate the HOLD function if:
Rthe vehicle is stationary.
Rthe engine is running.
Rthe driver's door is closed or if your seat belt is fastened.
Rthe electric parking brake is released.
...