Keys, doors and windows 21Extend the key and open the unit.Replace the battery (battery typeCR2032), paying attention to theinstallation position. Close the unitand synchronise.Radio remote controlsynchronisationAfter replacing the battery, unlock thedoor with the key in the driver's doorlock. The radio remote control will besynchronised when you switch on theignition.Memorised settingsBy removing the key from the ignitionswitch the settings are automaticallysaved for the key being used:■ Electronic climate control■ Lighting■ Infotainment system■ Power seats■ Power mirrors■ Central locking systemThe saved settings are automaticallyused when the key is inserted into theignition switch.Vehicle personalisation 3 97.Central locking systemUnlocks and locks doors, loadcompartment and fuel filler flap.A pull on an interior door handleunlocks the entire vehicle and opensthe door.NoticeIn the event of an accident ofa certain severity, the vehicleunlocks automatically.UnlockingPress button c.Two settings are possible: To unlockonly the driver's door, press button conce, and to unlock all doors, loadcompartment and fuel filler flap, pressbutton c twice.Settings can be changed in the menuSettings in the Info-Display. Vehiclepersonalisation 3 97.The settings can be saved for the keybeing used, Memorised settings3 21.