Mercedes-Benz S-Class Coupe, Owner'S Manual

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Display messages
Possible causes/consequences and M M Solutions
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Key not detected Key not detected
(red display message)
The key is not in the vehicle.
A warning tone also sounds.
If the engine is switched off, you can no longer lock the vehicle
centrally or start the engine.
X
Pull over and stop the vehicle safely as soon as possible, paying
attention to road and traffic conditions.
X
Secure the vehicle to prevent it from rolling away (
Y
page 178).
X
Locate the key.
X
Press a on the steering wheel to confirm the display mes-
sage.
Because there is interference from a strong source of radio waves,
the key is not detected whilst the engine is running.
A warning tone also sounds.
X
Pull over and stop the vehicle safely as soon as possible, paying
attention to road and traffic conditions.
X
Secure the vehicle to prevent it from rolling away (
Y
page 178).
X
Operate the vehicle with the key in the ignition lock if necessary.
Â
Remove starting Remove starting
button, then button, then
insert key insert key
The key is continually undetected.
The key detection function has a temporary malfunction or is
faulty. A warning tone also sounds.
X
Insert the key into the ignition lock and turn it to the desired
position.
X
Visit a qualified specialist workshop.
Display messages
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