Mercedes-Benz E-Class 2009 Owner's Manual page 251

Troubleshooting
248
Problem
You can no longer lock
or unlock the vehicle
using KEYLESS GO*.
You have lost a key.
You have lost the emer-
gency key element.
The key cannot be
turned in the ignition
lock.
Possible causes/consequences and M M Solutions
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.
KEYLESS-GO* is malfunctioning.
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 the key checked at a qualified specialist workshop.
X
There is interference from a powerful source of radio waves.
Lock/unlock the vehicle as described in the "Opening and clos-
X
ing in an emergency" section (
Have the key cancelled at a Mercedes-Benz Service Centre.
X
Report the loss immediately to the vehicle insurers.
X
If necessary, have the manual locks changed too.
X
Report the loss immediately to the vehicle insurers.
X
If necessary, have the manual locks changed too.
X
The key has been in position 0 for a considerable time.
Remove the key and reinsert it into the ignition lock.
X
Check the starter battery and charge it if necessary
X
( page 273).
Y
Start the engine.
X
The on-board voltage is too low.
Switch off non-essential consumers, e.g. seat heating* or inte-
X
rior lighting, and try to turn the key again.
If this does not work:
Check the starter battery and charge it if necessary
X
( page 273).
Y
or
Jump-start the vehicle (
X
or
Consult a qualified specialist workshop.
X
page 249).
Y
page 276).
Y
* optional