Mercedes-Benz 2007 E -Class Wagon Operator's Manual page 442

Pull battery compartment 2
( page 440) out of the housing.
3 Battery
4 Contact spring
Pull out batteries 3.
Using a lint-free cloth, insert new bat-
teries 3 under contact spring 4 with
the positive terminal (+) side facing up.
Return battery compartment 2
( page 440) into housing until it locks
into place.
Slide mechanical key 1 ( page 440)
back into the SmartKey/SmartKey
with KEYLESS-GO*.
Check the operation of the
SmartKey/SmartKey with
KEYLESS-GO*.
Practical hints
Replacing SmartKey batteries
441