SmartKey
SmartKey with remote control
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Panic alarm
W220s sold in the US and Canada have a panic button on the SmartKey keyfob. W220s sold elsewhere in the world do not have a panic button.
If panic button is pressed an audible alarm and flashing exterior lamps will operate for approximately 2.5 minutes.
To activate press and hold button (1) for at least one second. To deactivate press button (1) again or insert SmartKey in starter switch.
Replacing batteries
Replacement batteries: Lithium, type CR 2025 or equivalent.
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Remove mechanical key (1). Insert the mechanical key (1) in side opening and push gray slide. The battery compartment is unlatched. Pull the battery compartment (2) out of the SmartKey housing in direction of arrow. Remove the batteries.
Using a lint-free cloth, insert new batteries (3) under the contact spring (4) with the plus (+) side facing up. Return battery compartment into housing until it locks into place.
In case of KEYLESS-GO the SmartKey contains only a single battery on the other side.
SmartKey dissected
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KEYLESS-GO
KEYLESS-GO SmartKey has only one battery and electronic board contains two coils.
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