Mercedes-Benz E-Wagon 2014 Owners Manual - Manual (Page 88)

X Make sure that the surface of the battery is
free of lint, grease and other contaminants.
X
Insert the front tabs of battery
compartment cover : into the housing
first and then press to close it.
X Insert mechanical key ; into the
SmartKey (
Y
page 84).
X Check the function of all SmartKey buttons
on the vehicle.
86
SmartKey
Opening
and
closing