Owner's Manual

Problem Possible causes/consequences and Solutions
Repeatedly tap the key against your palm until battery falls out.
Insert the new battery with the positive terminal facing upwards. Use a lint-free cloth to do so.
Make sure that the surface of the battery is free of lint, grease and other contamination.
Insert the front tabs of battery compartment cover into the housing and then press to close it.
Insert emergency key element into the key .
Check the function of all key buttons on the vehicle.
Problems with the key
You can no longer lock or unlock the
vehicle using the key.
The key battery is weak or discharged.
Check the key battery and replace if necessary .
If this does not work:
Lock or unlock the vehicle using the emergency key element .
Interference from a powerful source of radio waves.
Lock or unlock the vehicle using the emergency key element .
The key is faulty.
Lock or unlock the vehicle using the emergency key element .
Have the key checked at a qualified specialist workshop.
You can no longer lock or unlock the
vehicle using KEYLESS-GO.
KEYLESS-GO has been deactivated.
Reactivate KEYLESS-GO .
The key battery is weak or discharged.
Check the key battery and replace if necessary .
If this does not work:
Lock or unlock the vehicle using the emergency key element .
Interference from a powerful source of radio waves.
Lock or unlock the vehicle using the emergency key element .
Fault with KEYLESS-GO.
Lock or unlock the vehicle using the remote control function of the key.
Have the vehicle and key checked at a qualified specialist workshop.
If the vehicle cannot be locked or unlocked even using the remote control
function:
Lock or unlock the vehicle using the emergency key element .
Have the vehicle and key checked at a qualified specialist workshop.
The engine cannot be started using the
key.
The on-board voltage is too low.
Switch off non-essential consumers, e.g. seat heating or interior lighting,
and try to start the engine again.
If this does not work:
Check the starter battery and charge it if necessary .
or
Jump-start the vehicle .
or
Consult a qualified specialist workshop.
The engine cannot be started using the
Start/Stop button. The key is in the
vehicle.
The vehicle is locked.
Unlock the vehicle and try to start the vehicle again.
The key battery is weak or discharged.
Check the key battery and replace if necessary .
If this does not work:
Start your vehicle with the key in the ignition lock.
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Interactive Owner's Manual
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http://moba.i.daimler.com/baix/cars/w205/en_GB/index.html