Lost - Mercedes-Benz C Class Owner's Manual

Practical advice
Troubleshooting
Problem
You cannot lock or unlock the
vehicle using the key.
The battery check lamp on the
key does not light up when
tested.
You have lost a key.
You have lost the emergency
key element.
The key cannot be turned in the
ignition lock.
276
Possible cause/consequence Suggested solutions
The key is faulty.
The key batteries are dis-
charged.
The on-board voltage is too low.
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E
Lock ( e page 280) or unlock (
the emergency key element.
E
Have the key checked at a qualified specialist workshop.
E
e
Change the batteries ( page 283).
E
Have the key cancelled at a Mercedes-Benz Service Centre.
E
Report the loss immediately to the vehicle insurers.
E
If necessary, have the manual locks changed too.
E
Report the loss immediately to the vehicle insurers.
E
If necessary, have the manual locks changed too.
E
Switch off non-essential consumers, e.g. the seat heating* or
interior lighting, and try to turn the key again.
If this does not work:
E
Check the starter battery and recharge it if necessary
( e page 302).
or
E
Jump-start the vehicle ( e
or
E
Consult a qualified specialist workshop.
e page 279) the vehicle using
page 303).