Deactivating the function of the key
If you deactivate the key function, the KEYLESS-GO functions are also deactivated. Access or drive authorization by KEYLESS-GO is then no longer possible with that particular key. Activate the function of the key so that all its functions will again be available. You can also deactivate the function of the key to reduce the energy consumption of the key if you do not use the vehicle or a key for an extended period of time.
If you do not use the vehicle or a key for an extended period of time, you can also deactivate the function of the key to reduce the energy consumption of the key.
To deactivate:
press the 
button on the key twice in quick succession. The key indicator lamp flashes twice briefly and lights up once.
To activate:
press any button on the key. When the vehicle is started with the key in the stowage compartment of the centre console, the function of the key is automatically activated More.
Overview of emergency call systems
Both the Mercedes-Benz emergency call system as well as the 112 emergency call system (EU eCall) can help to reduce the time between an accident and the arrival of emergency services at the site of the accident. They help locate an accident site in places that are difficult to access.
Both emergency call systems can initiate an emergency call automatically More or manually More.
Only make emergency calls if you or others are in need of rescue. Do not make an emergency call in the event of a breakdown or a similar situation.
Messages on the display
The following messages appear in the display of both emergency call systems:
SOS NOT READY: the vehicle is not switched on or the emergency call system is malfunctioning. This does not necessarily indicate complete failure of the emergency call system. Emergency calls call still be transmitted.
The display only refers to the vehicle and does not take account of the availability of mobile phone networks and the Mercedes-Benz emergency call centre.
The functional readiness of the emergency call system on the vehicle can be seen when the SOS NOT READY display disappears once the vehicle is switched on.
: The icon appears in the display during an active emergency call.
If there is a malfunction in the emergency call system (e.g. a fault with the speaker, microphone, airbag, SOS button), a corresponding message appears on the instrument display.
Emergency guide
In the event of an accident or breakdown, the emergency guide shows safety notes on the central display.
These include, for example:
Recommended actions when leaving the vehicle
Procedure for safely removing seat belts in the event of an accident whereby the vehicle comes to rest on its roof
The emergency guide is activated in the following situations:
Occupant protection system has been triggered
An emergency call is made
Certain breakdown situations
The availability as well as the scope of the emergency guide can vary depending in the country and vehicle equipment.