Mercedes-Benz GL-Class 2007 Owners Manual - Manual (Page 508)

507
Practical hints
Replacing SmartKey batteries
3 Batteries
4 Contact spring
̈ Pull out batteries 3.
̈ Using a line-free cloth, insert new
batteries
3 under contact springs 4
with the positive terminal (+) side
facing up.
̈ Return battery compartment 2 into
housing until it locks into place.
̈ Slide mechanical key 1 back into the
SmartKey or SmartKey with
KEYLESS-GO*.
̈ Check the operation of the SmartKey
or SmartKey with KEYLESS-GO*.