Mercedes-Benz C-Class 2014 Owner's Manual page 98

Problems with the key
Problem
You can no longer lock
or unlock the vehicle
using the key.
You can no longer lock
or unlock the vehicle
using KEYLESS-GO.
Possible causes/consequences and M M Solutions
The key battery is discharged or nearly discharged.
Check the key battery (
X
( page 94).
Y
If this does not work:
Unlock ( page 98) or lock (
X
Y
emergency key element.
There is interference from a powerful source of radio waves.
Unlock ( page 98) or lock (
X
Y
emergency key element.
The key is faulty.
Unlock ( page 98) or lock (
X
Y
emergency key element.
Have the key checked at a qualified specialist workshop.
X
KEYLESS-GO was deactivated.
Reactivate KEYLESS-GO (
X
The key battery is discharged or nearly discharged.
Check the key battery (
X
( page 94).
Y
If this does not work:
Unlock ( page 98) or lock (
X
Y
emergency key element.
There is interference from a powerful source of radio waves.
Unlock ( page 98) or lock (
X
Y
emergency key element.
There is a fault with KEYLESS-GO.
Lock/unlock the vehicle using the remote control function of
X
the key.
Have the vehicle and key checked at a qualified specialist work-
X
shop.
If the vehicle can also not be locked/unlocked using the remote
control function:
Unlock ( page 98) or lock (
X
Y
emergency key element.
Have the vehicle and key checked at a qualified specialist work-
X
shop.
page 94) and replace it if necessary
Y
page 100) the vehicle using the
Y
page 100) the vehicle using the
Y
page 100) the vehicle using the
Y
page 91).
Y
page 94) and replace it if necessary
Y
page 100) the vehicle using the
Y
page 100) the vehicle using the
Y
page 100) the vehicle using the
Y
Key
95
Z