Mercedes-Benz E-Class: Changing the battery - Smart Key battery - Smart Key - Opening/closing - Mercedes-Benz E-Class Owners ManualMercedes-Benz E-Class: Changing the battery

You require a CR 2025 3 V cell battery.

•► Take the mechanical key out of the SmartKey

•► Press mechanical key 2 into the opening

•► Press mechanical key 2 into the opening in the SmartKey in the direction of the arrow until battery tray cover 1 opens.

When doing so, do not hold cover 1 shut.

•► Remove battery tray cover 1.

•► Repeatedly tap the SmartKey against your

•► Repeatedly tap the SmartKey against your palm until battery 3 falls out.

•► Insert the new battery with the positive terminal facing upwards. Use a lint-free cloth to do so.

•► Make sure that the surface of the battery is free from lint, grease and all other forms of contamination.

•► Insert the front tabs of battery tray cover 1 and then press to close it.

•► Insert the mechanical key into the SmartKey.

•► Check the function of all SmartKey buttons on the vehicle.

    Checking the battery
    •► Press the or button. The battery is working properly if battery check lamp 1 lights up briefly If battery check lamp 1 does not light up briefly during the test, the battery is ...

    Problems with the SmartKey
    Problem Possible causes/consequences and  Solutions You cannot lock or unlock the vehicle using the SmartKey. The SmartKey battery is discharged or nearly discharged ...

    See also:

    Where to Put the Restraint
    According to accident statistics, children and infants are safer when properly restrained in a child restraint system or infant restraint system secured in a rear seating position. We recom ...

    Connecting electrical devices
    Sockets The lighter socket can be used as a socket for electrical equipment while the engine is running or when the ignition is switched on. The total load of all sockets must not exceed 140 wa ...

    Replacing batteries in the remote key/ PCC
    The battery/batteries in the remote key/PCC should be replaced if: The information symbol lights up and a text appears in the information display. and/or the vehicle's locks repeatedly do ...