Mercedes-Benz CLS-Class 2008 Owners Manual - Manual (Page 404)

403
Practical hints
Replacing SmartKey batteries
3 Batteries
4 Contact springs
̈ Pull out batteries 3.
̈ Using a line-free cloth, insert new bat-
teries
3 under contact springs 4 with
the positive terminal (+) side facing up.
̈ Return battery compartment 2
( ୴ page 402) into housing until it locks
into place.
̈ Slide the mechanical key back into the
SmartKey/SmartKey with
KEYLESS-GO*.
̈ Check the operation of the SmartKey/
SmartKey with KEYLESS-GO*.