CAUTION■The running auxiliary heater consumes fuel from the vehicle tank and auto-
matically controls the filling level. If only a low quantity of fuel is present in the
fuel tank, the auxiliary heating switches off.■
The exhaust pipe of the auxiliary heating, which is located on the underside
of the vehicle, must not be clogged and the exhaust flow must not be blocked.
■
If the auxiliary heating is running, the vehicle battery discharges. If the auxili-
ary heating and ventilation has been operated several times over a longer peri-
od, the vehicle must be driven a few kilometres in order to recharge the vehi-
cle battery.
■
The air inlet in front of the windscreen must be free (e.g. of ice, snow or
leaves) to ensure that the auxiliary heating operates properly.
Note
■ The auxiliary heating switches on the blower B » Fig. 125 on page 119 orC » Fig. 126 on page 119 only if it has achieved a coolant temperature of ap-
prox. 50 °C.■
At low outside temperatures, this can result in a formation of water vapour in
the area of the engine compartment. This is quite normal and is not an operat-
ing problem.
■
So that warm air can flow into the vehicle interior after switching on the aux-
iliary heating, you must maintain the comfort temperature normally selected
by you, leave the fan switched on and leave the air outlet vents in an open po-
sition. It is recommended to put the air flow in the position
or
.
Switching on/off
Fig. 127
Button for switching on/off the system directly on the operating
part of the air conditioning/Climatronic
Read and observe and on page 121 first.
The auxiliary heating can be switched on/off as follows.
Manually switching on Using the button on the operating part of the manual air conditioning/Cli-
matronic. The indicator light in the button illuminates » Fig. 127.
By using the radio remote control » page 123.
Manually switching off Using the button on the operating part of the manual air conditioning/Cli-
matronic. The indicator light in the button goes out » Fig. 127.
By using the radio remote control » page 123.
After switching the system off, the auxiliary heating will continue running a lit- tle while longer in order to burn the remaining fuel in the auxiliary heater.
After switching off the auxiliary heating, the coolant pump still runs for a short
period.
Switching on automatically
The auxiliary heater is switched on according to the Infotainment set-
tings » Infotainment manual , chapter Vehicle settings .
When automatic switching on is activated, the indicator light in the symbol
button lights up for about 10 seconds after the ignition is turned off.
Switching off automatically
Turning off the auxiliary heating occurs in the following cases.
› The switch-off time set in Infotainment has been achieved
» Operating in-
structions for Infotainment , chapter Vehicle settings .
› The fuel level has reached the reserve area (the warning icon
illuminates).
› The charge state of the vehicle battery has reduced too much
» page 200.
122Using the system
Fig. 223
Cover for the fuse box in the en-
gine compartment: Plastic clip
for fuses
Read and observe and on page 228 first.
Replacing fuses
›
Press together the interlocks of the cover simultaneously in the direction of
the arrow
1
» Fig. 222 .
›
Remove the cover in the direction of the arrow
2
.
›
Replace the appropriate fuse.
›
Place the cover on top of the fusebox.
›
Push in the interlocks on the cover and lock.
CAUTION
The cover for the fuse box in the engine compartment must always be applied
correctly. Water may get into the fuse box if the cover is not replaced properly
- there is a risk of damage to the vehicle.
Assignment of fuses in the engine compartment
Read and observe
and on page 228 first.
No.Consumer1Control unit for ESC, ABS2Control unit for ESC, ABS3Engine control unit4Radiator fan, oil temperature sensor, air volume sensor, control
valve for fuel pressure, relay for electrical auxiliary heating5Coil of the relay for the ignition system, coil of the CNG relay6Brake sensor7Coolant pump, radiator shutter8Lambda probeNo.Consumer9Ignition, control unit for preheating system10Control unit for fuel pump, ignition11Electrical auxiliary heating system12Electrical auxiliary heating system13Control unit for automatic gearbox14Not assigned15Horn16Ignition, fuel pump17Control unit for ABS, ESC, engine control unit18Data bus control unit19Windscreen wipers20Alarm21Windscreen heater - left22Engine control unit23Starter24Electrical auxiliary heating system31Not assigned32Not assigned33Not assigned34Windscreen heater - right35Not assigned36Not assigned37Control unit for auxiliary heating38Not assigned
Bulbs
Introduction
This chapter contains information on the following subjects:
Bulb arrangement in the headlights
232
Replacing the low beam bulb
233
231Fuses and light bulbs
