Mercedes-Benz C-Clas 2016 Owner's Manual page 89

Key
86
Problem
You can no longer lock or
unlock the vehicle using
KEYLESS-GO.
The engine cannot be
started using the key.
The engine cannot be
started using the Start/
Stop button. The key is in
the vehicle.
Possible causes/consequences and M M Solutions
KEYLESS-GO has been deactivated.
Reactivate KEYLESS-GO (
X
The key battery is weak or discharged.
Check the key battery (
X
( page 84).
Y
If this does not work:
Lock or unlock the vehicle using the emergency key element
X
( page 89).
Y
Interference from a powerful source of radio waves.
Lock or unlock the vehicle using the emergency key element
X
( page 89).
Y
Fault with KEYLESS-GO.
Lock or unlock the vehicle using the remote control function of the
X
key.
Have the vehicle and key checked at a qualified specialist work-
X
shop.
If the vehicle cannot be locked or unlocked even using the remote
control function:
Lock or unlock the vehicle using the emergency key element
X
( page 89).
Y
Have the vehicle and key checked at a qualified specialist work-
X
shop.
The on-board voltage is too low.
Switch off non-essential consumers, e.g. seat heating or interior
X
lighting, and try to start the engine again.
If this does not work:
Check the starter battery and charge it if necessary (
X
or
Jump-start the vehicle (
X
or
Consult a qualified specialist workshop.
X
The vehicle is locked.
Unlock the vehicle and try to start the vehicle again.
X
The key battery is weak or discharged.
Check the key battery (
X
( page 84).
Y
If this does not work:
Start your vehicle with the key in the ignition lock.
X
Interference from a powerful source of radio waves.
Start your vehicle with the key in the ignition lock.
X
page 82).
Y
page 84) and replace if necessary
Y
page 333).
Y
page 84) and replace if necessary
Y
page 332).
Y