Mercedes-Benz 2007 E 320 BLUETEC Operator's Manual page 443

Practical hints
Replacing SmartKey batteries
Pull battery compartment 2
( page 441) out of the housing.
3 Batteries
4 Contact springs
Pull out batteries 3.
442
Using a lint-free cloth, insert new bat-
teries 3 under contact springs 4 with
the positive terminal (+) side facing up.
Return battery compartment 2
( page 441) into housing until it locks
into place.
Slide mechanical key 1 ( page 441)
back into the SmartKey/SmartKey
with KEYLESS-GO*.
Check the operation of the
SmartKey/SmartKey with
KEYLESS-GO*.