Mercedes-Benz E-Class Owner's Manual page 84

Problems with the key
Problem
You cannot lock or
unlock the vehicle
using the key.
You can no longer lock
or unlock the vehicle
using KEYLESS-GO.
You have lost a key.
Possible causes/consequences and M Solutions
The key battery is discharged or nearly discharged.
Try again to lock/unlock the vehicle using the remote control
X
function of the key. Point the tip of the key at the driver's door
handle from close range and press the % or & button.
If this does not work:
Check the key battery (
X
( page 79).
Y
Lock ( page 84) or unlock (
X
Y
the emergency key element.
The key is faulty.
Lock ( page 84) or unlock (
X
Y
the emergency key element.
Have the key checked at a qualified specialist workshop.
X
KEYLESS-GO is in standby mode because the vehicle has not been
unlocked for an extended period.
Pull the door handle and then turn the key to position 2 in the
X
ignition lock.
There is interference from a powerful source of radio waves.
Lock/unlock the vehicle using the remote control function of
X
the key. Point the tip of the key at the driver's door handle from
close range and press the % / & button.
There is a fault with KEYLESS-GO.
Lock/unlock the vehicle using the remote control function of
X
the key. Point the tip of the key at the driver's door handle from
close range and press the % / & button.
Have KEYLESS-GO checked at a qualified specialist workshop.
X
If this does not work:
Check the key battery (
X
( page 79).
Y
Lock ( page 84) or unlock (
X
Y
the emergency key element.
Have the key deactivated at a qualified specialist workshop.
X
Report the loss immediately to the vehicle insurers.
X
If necessary, have the locks changed as well.
X
page 79) and replace it if necessary
Y
page 84) the vehicle using
Y
page 84) the vehicle using
Y
page 79) and replace it if necessary
Y
page 84) the vehicle using
Y
Key
81
Z