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 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 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.
See also:
Headlamp cleaning system
The headlamps are cleaned automatically if the "Wipe with washer fluid" function
is operated ten times while the lights are on and the engine is running (). When you switch off the ignitio ...
Fuel filler flap
The fuel filler flap is unlocked or locked
automatically when you open or close the
vehicle with the SmartKey or using KEYLESS-GO.
The position of the fuel filler cap is displayed
in the instru ...
DISTRONIC displays in thespeedometer
When DISTRONIC is activated, one or
two segments in the set speed range light up.
For design reasons, the speed displayed
in the speedometer may differ slightly from
the speed set for DISTRON ...
