Mercedes-Benz C Class Owner's Manual page 279

KEYLESS GO*
Problem
You cannot lock or unlock the
vehicle using the KEYLESS GO
key.
You cannot lock or unlock the
vehicle using the KEYLESS GO
key.
You cannot lock or unlock the
vehicle using the KEYLESS GO
key.
The battery check lamp in the
KEYLESS GO key does not light
up when tested.
Possible cause/consequence Suggested solutions
The KEYLESS GO key batteries
are discharged or nearly dis-
charged.
There is a fault with KEYLESS
GO.
There is interference from a
powerful source of radio waves.
The KEYLESS GO key batteries
are discharged.
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E
Lock or unlock the vehicle using the remote control function
of the KEYLESS GO key. Point the tip of the key at the driver's
door handle from close range, as for the summer opening or
the convenience closing feature, (
the vehicle again.
If this does not work:
E
Lock or unlock the vehicle using the emergency key element
e
( page 280).
E
Check the KEYLESS GO key batteries and change them if nec-
essary ( e page 283).
E
Check the KEYLESS GO key batteries (
e
them if necessary ( page 283).
E
Have the KEYLESS GO key checked at a qualified specialist
workshop.
E
Lock or unlock the vehicle using the emergency key element
( e page 280).
e
Change the batteries ( page 283).
Practical advice
Troubleshooting
e page 107) and try to open
e
page 77) and change
277
ee