Anti-Theft Protection - Mercedes-Benz C-Class Convertible 2021 Operator's Manual

82 Opening and closing
Make sure that no parts of the body are
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in the closing area.
To stop the closing process, release the
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button or press the button again to
reopen the side window.
A side window cannot be closed and you can‐
not see the cause.
Check to see whether any objects are in the
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window guide.
Adjust the side windows.
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Adjusting the side windows
If a side window is obstructed during closing and
reopens again immediately:
Immediately after this, pull and hold the cor‐
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responding button again until the side win‐
dow has closed and hold the button for at
least one more second (re-adjustment).
The side window will be closed without the
automatic reversing function.
If the side window is obstructed again and
reopens again immediately:
Immediately after this, pull and hold the cor‐
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responding button again until the side win‐
dow has closed and hold the button for at
least one more second (follow-up adjust‐
ment).
The side window will be closed without the
automatic reversing function.
The side windows cannot be opened or
closed using the convenience opening fea‐
ture.
Possible cause:
The SmartKey battery is weak or discharged.
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Check the battery using the indicator lamp
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( page 63).
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Replace the SmartKey battery, if necessary
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( page 65).
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Anti-theft protection

Function of the immobilizer
The immobilizer prevents your vehicle from being
started without the correct SmartKey.
The immobilizer is automatically activated when
the ignition is switched off and deactivated when
the ignition is switched on.
When leaving the vehicle, always take the Smart‐
Key with you and lock the vehicle. Anyone can
start the engine if a valid SmartKey has been left
inside the vehicle.
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In the event the engine cannot be started
(yet the vehicle's battery is charged), the
system is not operational. Contact an
authorized Mercedes-Benz Center or call
1-800-FOR-MERCedes (in the USA) or
1-800-387-0100 (in Canada).
ATA (anti-theft alarm system)
Function of the ATA system
If the ATA system is armed, a visual and audible
alarm is triggered in the following situations:
When a door is opened
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When the trunk lid is opened
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When the hood is opened
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