Keys, doors and windows 21Extend the key and open the unit.Replace the battery (battery typeCR 2032), paying attention to theinstallation position. Close the unitand synchronise.Key with fixed key sectionHave the battery replaced by aworkshop.Radio remote controlsynchronisationAfter replacing the battery, unlock thedoor with the key in the driver's doorlock. The radio remote control will besynchronised when the ignition isswitched on.Memorised settingsWhenever the key is removed fromthe ignition switch, the followingsettings are automatically memorisedby the key:■ Lighting■ Infotainment system (only CD 400)■ Central locking system■ Comfort settingsThe saved settings are automaticallyused the next time the memorised keyis inserted into the ignition switch andturned to position 1 3 128.A precondition is that Personalizationby driver is activated in the personalsettings of the Graphic-Info-Display.This must be set for each key used.On vehicles equipped withColour-Info-Display, thepersonalisation is permanentlyactivated.Vehicle personalisation 3 106.Central locking systemUnlocks and locks doors, loadcompartment and fuel filler flap.A pull on an interior door handleunlocks the respective door. Pullingthe handle once more opens the door.NoteIn the event of an accident in whichairbags or belt pretensioners aredeployed, the vehicle isautomatically unlocked.UnlockingPress button c.Two settings are selectable:■ To unlock only the driver's door andthe fuel filler flap, press button conce. To unlock all doors and theload compartment, press button ctwice,or■ press button c once to unlock alldoors, load compartment and fuelfiller flap.
