Mercedes-Benz C-Class, Owner'S Manual

Page: 98 / 489

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