Problems with the cooling with air dehumidification function
When you press the 
button, the
indicator lamp in the button flashes three
times or remains off. You can no longer switch
on the cooling with air dehumidification
function.
Consult a qualified specialist
workshop.
See also:
Body testing facility: the M-Class on the road simulator
A totally dependable body and chassis systems that can cope with high levels
of strain under even the most demanding conditions over hundreds of thousands of
kilometres are particularly indispensa ...
SmartKey
Display messages
Possible causes/consequences and •► Solutions
Key Does Not
Belong to Vehicle
You have put the wrong SmartKey in the ignition lock.
•► Use the correct ...
High-beam spot lamp (vehicles with halogen daytime running lamps)
Switch off the lights.
Open the hood.
Turn housing cover 1 counter-clockwise
and pull it out.
Turn bulb holder 2 counter-clockwise and
pull it out.
Take the bulb out of bulb holder 2.
...