Page 126 of 223
Note■After coupling the trailer and connecting up the power socket, check the rear
lights on the trailer to ensure they work.■
If there is an error in the trailer lighting system, check the fuses in the fuse box
in the dashboard » page 193.
■
If you tow a trailer frequently, you should also have your car inspected between
service intervals.
■
The handbrake on the towing vehicle must be applied when coupling and un-
coupling the trailer.
Anti-theft alarm system
First read and observe the introductory information and safety warn-
ings
on page 121.
When the vehicle is locked, the alarm is activated as soon as the electrical con- nection to the trailer is interrupted.
Always switch off the anti-theft alarm system before a trailer is coupled or uncou- pled » page 35 .
Conditions for including a trailer in the anti-theft alarm system. The vehicle is factory-fitted with an anti-theft alarm system and towingequipment.
The trailer is electrically connected to the towing vehicle by means of the
trailer socket.
The electrical system of the vehicle and trailer is functional. The vehicle is locked with the vehicle key and the anti-theft alarm system isactivated.
Note
For technical reasons, trailers with rear LED lights cannot be connected to the an-
ti-theft alarm system.
123Towing a trailer
Page 196 of 223
Fuses in the dash panelFig. 150
Underside of the dash panel:
Distribution board cover.
Fig. 151
Schematic representation of the fuse box for vehicles with left-
hand steering/right-hand steering
First read and observe the introductory information and safety warn-
ings
on page 192.
The fuses are located on the left side of the dash panel behind a cover.
› Carefully remove the cover in the direction of the arrow
» Fig. 150.
› After the fuse has been replaced, replace the cover in the dash panel in the op-
posite direction of the arrow so that the guide lugs are guided into the open- ings of the dash panel. Close the cover until it clicks into place.
Fuse assignment in the dash panel
No.Power consumer1S-contact2START-STOP, air-conditioning system3Instrument cluster, headlamp beam adjustmentNo.Power consumer4Control unit for ABS, button for START STOP5Petrol engine: Speed regulating system6Reversing light (manual gearbox)7Ignition, engine control unit, automatic gearbox8Brake pedal switch, clutch pedal switch9Operating controls for the heating, control unit for air conditioning sys-
tem, parking aid, control unit for cornering lights, radiator fan, washing nozzles10Windscreen Wiper and Washer System11Mirror adjustment12Control unit for trailer detection13Automatic gearbox control unit14Motor for halogen projector headlights with cornering light function15PDA navigation system16Electrohydraulic power steering17Light switch power supply18Mirror heater19S-contact20Alarm21Reversing light, fog lights with the function CORNER22Operating controls for the heating, control unit for air conditioning sys-
tem, parking aid, mobile phone, instrument cluster, steering angle
sender, ESC, vehicle voltage control unit, multifunction steering wheel23Interior lighting, storage compartment and luggage compartment, side
lights24Central control unit25Seat heaters26Rear window wiper27Telephone preinstallation28Petrol engine: AKF valve, Diesel engine: Control flap29Injection, coolant pump30Fuel pump, ignition, Cruise control system, operation of PTC relay31Lambda probe 193Fuses and light bulbs
Page 197 of 223
No.Power consumer32High pressure fuel pump, pressure valve33Engine control unit34Engine control unit, vacuum pump35Daytime running lights/radio for vehicles with START-STOP36Main beam37Rear fog light, DC/DC converter START-STOP38Fog lights39Air blower for heating40-41Not assigned42Rear window heater43Horn44Windscreen wipers45Central control unit for convenience system46Engine control unit, fuel pump47Cigarette lighter, power socket in the luggage compartment48ABS, START-STOP (DC/DC) converter ESP49Turn signal lights, brake lights50START-STOP (DC/DC) transformer, radio51Electrical power window (front and rear) - left side52Electrical power window (front and rear) - right side53Parking light = left side, electrical sliding/tilting roof54START-STOP (instrument cluster), alarm55Automatic gearbox control unit56Headlight cleaning system, parking light - right side57Left low beam, headlight range adjustment58Low beam on the right
Fuses in the engine compartmentFig. 152
Vehicle battery: Distribution board cover.
Fig. 153
Schematic representation of
fuse box in engine compartment
First read and observe the introductory information and safety warn-
ings on page 192.
› Press the securing clips on the fuse box cover together at the same time in the
direction of arrow
A
» Fig. 152 and remove the cover in the direction of arrow
B
.
› Release the fixtures in the openings
C
using a flat screwdriver and fold the
cover upwards in direction of arrow
D
.
Fuse assignment in engine compartment
No.Power consumer1Alternator2Not assigned3Interior4Electrical auxiliary heating system 194Do-it-yourself
Page 213 of 223
Index
A
Abroad Driving abroad
109
Unleaded petrol109
ABS112
warning light24
Accessories147
Adjusting Exterior mirrors
53
Head restraints57
Steering wheel95
Adjusting the seats125
Adjustment Headlight beam
44
Seats55
Adjustments and technical changes Spoiler
149
Adjustments and technical modifications Airbags
149
Aerial151
See windows153
Airbag133
Adjustments and impairment of the airbag sys- tem
149
Deactivating138
Deployment133
Front airbag135
Head airbag137
Side airbag136
Switching off the front passenger airbag138
Airbag system133
Air conditioning Operation
81
Air conditioning system Air outlets
77
Climatronic83
Manual air conditioning system80
Air outlets77
Alarm35
Anti-theft alarm system35
Operation36
Trailer123
Antilock Braking System112
Armrest75
Ashtray69
ASR112
warning light23
Assist systems ABS
24, 112
ASR23, 112
Cruise control system114
EDS and XDS112
ESC23, 111
Parking aid113
START-STOP116
Auto Check Control19
Automatic gearbox Selector lever-emergency unlocking
103
Starting-off and driving102
Tiptronic102
Automatic load deactivation172
Automatic transmission100
Kickdown102
Malfunction103
Selector lever lock101
Using the selector lever101
AUX94
Avoiding damage to the vehicle Driving through water
109
Avoiding damage to your vehicle108
B
Ball head Check fitting
120
Fitting119
Ready position119
Removing120
Belts128
Belt tensioners131
Bicycle carrier65
Bonnet Closing
162
Opening162
Boot Cover
61
Emergency unlocking38
Fastening elements59
Fixing nets60
Folding hooks60
see Boot lid37
Unlocking the boot lid38
Boot lid37
Automatic locking37
Brake assist111
Brake booster99
Brake fluid168
Changing169
Checking168
Display messages20
Brakes Brake booster
99
Brake fluid168
Handbrake99
Indicator light20
Running in104
Braking Information for braking
98
Breakdown kit186
Bulbs Changing
195
In the rear light199
Button in the driver's door Electrical power windows
38
C
Car care
145
Washing150
210Index