Mercedes-Benz M-Class Owner's Manual page 285

Display messages
282
Display messages
&
inoperative See
Owner's Man.
Telephone No
Service
¥
Top up washer fluid
Key
Display messages
+
Key does not
belong to vehicle
+
Replace key
+
Change key batter‐
ies
+
Key not detec‐
ted(red display mes-
sage)
Possible causes/consequences and M Solutions
The auxiliary heating has a temporary malfunction or is faulty.
When the vehicle is on a level surface and the engine has cooled
X
down, make up to four attempts to switch on the auxiliary heat-
ing, waiting several minutes between each attempt
( page 130).
Y
If the auxiliary heating does not switch on, consult a qualified
X
specialist workshop.
Your vehicle is outside the network provider's transmitter/
receiver range.
Wait until the mobile phone operational readiness symbol
X
appears in the multifunction display.
The washer fluid level in the washer fluid reservoir has dropped
below the minimum.
Top up the washer fluid (
X
Possible causes/consequences and M Solutions
You have put the wrong key in the ignition lock.
Use the correct key.
X
The key needs to be replaced.
Visit a qualified specialist workshop.
X
The batteries of the KEYLESS-GO key are discharged.
Change the batteries (
X
The KEYLESS-GO key is not in the vehicle.
A warning tone also sounds.
If the engine is switched off, you can no longer lock the vehicle
centrally or start the engine.
Pull over and stop the vehicle safely as soon as possible, paying
X
attention to road and traffic conditions.
Apply the electric parking brake.
X
Locate the KEYLESS-GO key.
X
page 321).
Y
page 74).
Y