See also:

General notes
WARNING All categories of messages contain important information which should be taken note of and, where a malfunction is indicated, addressed as soon as possible at an authorized Mercedes-B ...

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: ...

Immobilizer
The immobilizer prevents your vehicle from being started without the correct SmartKey. When leaving the vehicle, always take the SmartKey with you and lock the vehicle. The engine can be started ...