2009 Mercedes CLS-Class Owner's Manual - Page 309
2009 Mercedes CLS-Class Manual
Page 309 highlights
Practical hints Replacing SmartKey batteries When inserting the batteries, make sure they are clean and free of lint. When replacing batteries, always replace both batteries. X X Insert mechanical key 1 into opening. Press mechanical key 1 in direction of arrow. Battery compartment 2 is unlatched. Pull battery compartment 2 out of the SmartKey housing. X X Slide mechanical key 1 back into the SmartKey. Check the operation of the SmartKey as well as the KEYLESS-GO function. i The required replacement batteries are available at any authorized Mercedes-Benz Center. Replacement batteries: Lithium, type CR 2025 or equivalent. X Remove the mechanical key from the SmartKey (Y page 303). X 3 Batteries 4 Contact springs X Pull out batteries 3. Insert new batteries 3 under contact springs 4 with the positive terminal (+) side facing up. Return battery compartment 2 into SmartKey housing until it locks into place. Z 1 Mechanical key 2 Battery compartment X X 307