See also:

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 wit ...

Important safety notes
Service products include the following:  - fuels (e.g. gasoline, diesel)  - additives for exhaust gas aftertreatment (DEF)  - lubricants (e.g. engine oil, transmission oil) ...

Towing a vehicle with both axles onthe ground
When having your vehicle towed, observe the important safety notes. WARNING   The power assistance for the steering and the brake force booster do not work when the engine is not runnin ...