The remote control key is not physically used when starting since the car is equipped with support for keyless starting (Passive Start) as standard. You simply need to have the key in the front part of the passenger compartment.
For cars equipped with keyless locking and unlocking (Passive Entry)* the key can be anywhere in the car to start the car. For cars with Passive Entry, a slightly smaller, lighter and button-less key (Key Tag) can also be purchased as an accessory.
The remote control keys2 can be linked to different driver profiles to save personal preferences in the car.
Warning
The remote control key contains a button cell battery. Keep new and used batteries out of the reach of children. If someone swallows a battery it may cause serious injury.
If damage is discovered, e.g. if the battery cover cannot be closed properly, then the product should not be used. Keep defective products out of the reach of children.
Remote control key buttons
Locking - Pressing the button locks the doors, tailgate and fuel filler flap and also arms the alarm*. - Press and hold to close all of the windows and the panoramic roof* simultaneously.
Unlocking - Pressing the button unlocks the doors, tailgate and fuel filler flap and also deactivates the alarm.- A longer press opens all windows simultaneously. This total airing function can be used, for example, to quickly air the car in hot weather.
Tailgate - Unlocks the tailgate only and disarms its alarm. On cars with power operated tailgate*, the tailgate is opened automatically when the button is held depressed. The tailgate is also closed with a long press – acoustic warning signals sound. 
Panic function - Used to attract attention in an emergency. Press and hold the button for at least 3 seconds or press it twice within 3 seconds to activate the direction indicators and the horn. The function can be turned off with the same button once it has been active for at least 5 seconds. Otherwise the function switches off automatically after 3 minutes.
Warning
If anyone is left in the car, make sure the power windows and panoramic roof* are de-energised by always taking the remote control key with you when you leave the car.
Note
Be aware of the risk of locking the remote control key in the car.
A remote control key or key tag left in the car will be deactivated when the car is locked and the alarm is armed using another valid key. The "Double lock" function is also deactivated. The key left behind is reactivated when the car is unlocked.
Button-less key (Key Tag)*
A Key Tag can be ordered as an accessory for cars equipped with the keyless locking and unlocking function. A key tag works the same way as the normal remote control key when it comes to keyless starting and locking and unlocking. The key is waterproof to a depth of approx. 10 metres (30 feet) for up to 60 minutes. It has no detachable key blade and the battery cannot be replaced.
Care Key - restricted remote control key
A Care Key allows the car owner to set a limit for the speed of the car. The limitation is intended to encourage the car to be driven in a safe manner, e.g. when being loaned out.
Interference
Remote control key functions for keyless starting and keyless locking and unlocking* can be disrupted by electromagnetic fields and screening.
Note
If there is still interference - use the remote control key's detachable key blade to unlock and then place the key in the backup reader in the cup holder to disarm the car and allow the car to be started.