Keys, doors and windows 23NoticeDo not put the electronic key in theload compartment or in front of theInfo-Display.Replacing battery in electronickeyReplace the battery as soon as thesystem no longer operates properlyor the range is reduced. The need forbattery replacement is indicated by amessage in the Driver InformationCentre 3 119.Battery replacement, see 'Radioremote control' 3 21.Electronic key synchronisationThe electronic key synchronises itselfautomatically during every startingprocedure.FaultIf the central locking cannot beoperated or the engine cannot bestarted, the cause may be one of thefollowing:● Fault in electronic key.● Electronic key is out of receptionrange.● The battery voltage is too low.● Overload of the central lockingsystem by operating at frequentintervals; the power supply isinterrupted for a short time.● Interference from higher-powerradio waves from other sources.To rectify the cause of the fault,change the position of the electronickey.Manual unlocking 3 24.Memorised settingsWhenever the ignition is switched off,the following settings areautomatically memorised by theremote control unit or the electronickey:● automatic climate control● lighting● Infotainment system● central locking system● Sport mode settings● comfort settingsThe saved settings are automaticallyused the next time the ignition isswitched on with the memorised keywith remote control unit 3 155 orelectronic key 3 22.A precondition is that Personalisationby Driver is activated in the personalsettings of the Info-Display. This mustbe set for each remote control unit orelectronic key which is used.Also memorised are the adjustmentsof the driver's seat and exteriormirrors, independent of the memorypositions 3 50.Power seat automatically moves intothe saved position when unlockingand opening the driver's door with thememorised remote control orelectronic key and Auto MemoryRecall in the Info-Display is activated.Vehicle personalisation 3 121.
