See also:

Before changing a fuse
► Park the vehicle and apply the parking brake. ► Switch off all electrical consumers. ► Remove the SmartKey from the ignition lock. The fuses are located in various fuse boxes: ...

Checking tire pressure electronically
  Make sure that the SmartKey is in position 2 in the ignition lock.   Press the or button on the steering wheel to select the Service menu.   Press the or button to sel ...

Opening the DEF filler cap
The filler neck for DEF is behind the fuel filler flap. The fuel filler flap is unlocked or locked automatically when you open or close the vehicle with the SmartKey or with KEYLESSGO. - Swi ...