Problem
Possible causes/consequences and
M
Solutions
The auxiliary heating sys-
tem switches off auto-
matically and/or cannot
be switched on.
The on-board voltage is too low. The auxiliary heating has switched
itself off or cannot be switched on.
X
Drive for a considerable distance.
The battery charges. The auxiliary heating is operational again as
soon as the on-board electrical system voltage is sufficient.
The auxiliary heating sys-
tem switches off auto-
matically and/or cannot
be switched on.
The fuse is malfunctioning.
X
Replace the fuse; see the "Fuse allocation" supplement.
X
Have the cause of the blown fuse determined at a qualified spe-
cialist workshop.
The auxiliary heating sys-
tem switches off auto-
matically and/or cannot
be switched on.
A malfunction has occurred.
X
Have the auxiliary heating checked at a qualified specialist work-
shop.
Auxiliary warm-air heater
General notes
!
Operating the auxiliary warm-air heater
draws from the vehicle battery. For this rea-
son, drive for a longer distance after using the
heater twice, at the latest.
!
Make sure that the flow of hot air is not
blocked. The auxiliary heating will otherwise
overheat and switch off.
Always observe the important safety instruc-
tions when operating the auxiliary heating
(
Y
page 144)
The air-intake aperture for the auxiliary warm-air
heater is located on the inner side of the left
front seat base. The warm-air outlet is located
on the rear side of this seat facing the rear com-
partment.
The auxiliary warm-air heater supplements the
climate control system of your vehicle and has
an auxiliary heating function.
The auxiliary heating system heats the air in the
vehicle interior to the set temperature (prese-
lection temperature). This occurs without using
the heat of the running engine. The auxiliary
heating is operated directly using the vehicle's
fuel. For this reason, the tank content must be at
least at reserve fuel level to ensure that the aux-
iliary heating functions.
The auxiliary heating switches off automatically
when the engine is switched off or when the set
heating time has elapsed.
The immediate heating mode of the auxiliary
heating supports the climate control system
when the engine is running and the outside tem-
perature is low.
You can operate the auxiliary heating:
R
via the timer in the stowage compartment
under the centre console (
Y
page 152)
R
using the remote control (
Y
page 150)
You can use the timer to specify up to 3 depar-
ture times, one of which may be preselected:
Operating the auxiliary heating using
the remote control
General notes
You can switch the auxiliary heating on and off
as well as set the operating duration with a
remote control. The remote control must be
synchronised with the auxiliary heating system
receiver. For more information, please contact a
qualified specialist workshop.
Store the remote control for the auxiliary heat-
ing such that the auxiliary heating function can-
not be switched on unintentionally. In particular,
ensure that the remote control is kept out of the
reach of children.
The remote control has a range of approximately
300 metres. This range is reduced by:
R
sources of radio interference
R
solid objects between the remote control and
the vehicle
150
Operating the auxiliary heating system
Climate control
