Mercedes-Benz M-Class Owner's Manual page 137

Operating the climate control system
134
Problems with the auxiliary heating/ventilation
Display messages
$
FAIL
FAIL
©
FAIL
Possible causes/consequences and M Solutions
The signal transmission between the transmitter and the vehicle
is faulty.
Change your position in relation to the vehicle, moving closer if
X
necessary.
Make another attempt to switch the auxiliary heating on or off
X
using the remote control.
This display message will only appear if you attempt to activate
the auxiliary heating.
There is not enough fuel in the fuel tank, or the auxiliary heating
is faulty.
Refuel at the nearest filling station.
X
Make another attempt to switch on the auxiliary heating using
X
the remote control.
Have the auxiliary heating checked at a qualified specialist
X
workshop.
This display message may appear if you attempt to activate the
auxiliary heating or during a status query.
If the auxiliary heating does not switch on or has switched off while
running, this has occurred due to one of the following reasons:
the auxiliary heating was started more than twice when the
R
engine was switched off.
the starter battery is not sufficiently charged.
R
there is too little fuel in the fuel tank.
R
the auxiliary heating is faulty.
R
If the auxiliary heating was switched on more than twice:
Switch on the engine and let it run for more than 10 seconds.
X
Make another attempt to switch on the auxiliary heating using
X
the remote control.
If the starter battery is not sufficiently charged:
Charge the starter battery.
X
Make another attempt to switch on the auxiliary heating using
X
the remote control.
If there is not enough fuel:
Refuel at the nearest filling station.
X
Make another attempt to switch on the auxiliary heating using
X
the remote control.