Page 148 of 311
146LightingTo prevent discharge of the vehicle
battery when driving, the following
systems are reduced automatically in two stages and finally switched off:
● auxiliary heater
● heated rear window and mirrors ● heated steering wheel
● heated mirrors
● heated seats
● fan
In the second stage, a message
which confirms the activation of the
vehicle battery discharge protection
will be displayed in the Driver
Information Centre.
Switching off electric lights To prevent discharge of the vehicle
battery when the ignition is switched off, some interior lights are switched
off automatically after some time.
Page 149 of 311

Climate control147Climate controlClimate control systems.............147
Heating and ventilation system 147
Air conditioning system ...........148
Electronic climate control system .................................... 150
Auxiliary heater ........................155
Air vents ..................................... 155
Adjustable air vents .................155
Fixed air vents ......................... 155
Maintenance .............................. 156
Air intake ................................. 156
Air conditioning regular operation ................................ 156
Service .................................... 156Climate control systems
Heating and ventilation system
Controls for: ● temperature
● air distribution l, M and K
● fan speed Z
● demisting and defrosting V
Heated rear window Ü 3 43.
Heated exterior mirrors Ü 3 40.
Heated seats ß 3 54.
Heated steering wheel * 3 92.
Temperaturered:warmblue:cold
Heating will not be fully effective until
the engine has reached normal
operating temperature.
Air distribution
l:to windscreen and front door
windowsM:to head area via adjustable air
ventsK:to foot well and windscreen
All combinations are possible.
Fan speed Adjust the air flow by switching the fan
to the desired speed.
Page 150 of 311

148Climate controlDemisting and defrosting
●Press V: the air distribution is
directed towards the windscreen.
● Set temperature control to warmest level.
● Set fan speed to highest level.
● Switch on heated rear window Ü.
● Open side air vents as required and direct them towards the doorwindows.
Air conditioning system
Controls for:
● temperature
● air distribution l, M and K
● fan speed Z
● demisting and defrosting V
A/C:cooling4:air recirculationÜ:heated rear window
Heated rear window Ü 3 43.
Heated exterior mirrors Ü 3 40.
Heated seats ß 3 54.
Ventilated seats A 3 54.
Heated steering wheel A 3 92.
Cooling A/C
Press A/C to switch on cooling.
Activation is indicated by the LED in
the button. Cooling is only functional
when the engine is running and
climate control fan is switched on.
Press A/C again to switch off cooling.
The air conditioning system cools and
dehumidifies (dries) as soon as the
outside temperature is slightly above the freezing point. Therefore
condensation may form and drip from under the vehicle.
Page 153 of 311
Climate control151Heated exterior mirrors Ü 3 40.
Heated seats ß 3 54.
Ventilated seats A 3 54.
Heated steering wheel A 3 92.
Each change of settings is shown in
the Info Display for a few seconds.
The electronic climate control system
is only fully operational when the
engine is running.
Automatic mode AUTO
Basic settings for automatic control
with maximum comfort:
● Press AUTO, the air distribution
and fan speed are regulated
automatically.
● Open all air vents to allow optimised air distribution in
automatic mode.
● Press A/C to switch on optimal
cooling and demisting. The LED in the button illuminates to
indicate activation.
● Set the preselected temperatures for driver and front
passenger using the left and right
rotary knob. Recommended
temperature is 22 °C.
The fan speed regulation in automatic mode can be changed in the Settings menu.
Vehicle personalisation 3 123.
Temperature preselection
Page 251 of 311
Vehicle care249No.Circuit1Rear seat heating (only for vehi‐cles without alarm horn)2Climate control system / fan3Power seat driver side4Power seat passenger side5–6Power window front7ABS8Heated steering wheel9Body control module 810Power window rear11Sunroof12Body control module 413Seat heating (only on vehicles
without alarm horn)14Exterior mirror15Body control module 116Body control module 7No.Circuit17Body control module 618Body control module 319Data link connector20Airbag system21Climate control system22Central locking system / tailgate23Electronic key system24Power seat memory function25Airbag system steering wheel26Ignition switch / Steering
column lock27Body control module 228USB socket29Cigarette lighter / Power outlet
front30Selector lever31Rear window wiper32Transmission control module
Page 308 of 311

306Head restraint adjustment .............8
Head restraints ............................ 46
Heated mirrors ............................. 40
Heated rear window ..................... 43
Heated steering wheel .................92
Heating .................................. 54, 56
Heating and ventilation system . 147
High beam ......................... 112, 138
High beam assist ................112, 136
Hill start assist ........................... 178
Horn ....................................... 14, 92
I
Identification plate .....................281
Ignition switch positions .............158
Immobiliser .......................... 38, 112
Indicators .................................... 102
Info Display ................................. 119
Information displays.................... 114
Instrument cluster ........................99
Instrument panel fuse box .........248
Instrument panel illumination control .................................... 143
Instrument panel overview ........... 10
Interior care ............................... 275
Interior lighting ............................ 143
Interior lights ...................... 143, 245
Interior mirrors .............................. 40
Interruption of power supply ......174
Introduction .................................... 3J
Jump starting ............................. 270
K
Key, memorised settings ..............24
Keys ............................................. 20
Keys, locks ................................... 20
L
Lane keep assist ................110, 214
Lashing eyes ............................... 81
LED headlights ...................112, 139
Lighting features .........................144
Light switch ................................ 135
Load compartment ................30, 73
Load compartment cover .............79
Load compartment fuse box ......250
Loading information .....................88
Low fuel ..................................... 112
M Malfunction indicator light ..........109
Manual anti-dazzle ......................40
Manual mode ............................. 173
Manual seat adjustment ...............48
Manual transmission .................. 175
Manual windows ..........................41
Massage ....................................... 55
Maximum speed ......................... 254
Memorised settings ......................24
Midlevel display .......................... 114Mirror adjustment ........................... 9
Misted light covers .....................143
N Natural gas ......................... 104, 218
New vehicle running-in ..............158
Number plate light .....................244
O
Object detection systems ...........199
Odometer ................................... 103 Oil, engine .......................... 278, 282
OnStar ........................................ 130
Outside temperature ....................95
Overrun cut-off ........................... 163
P Parking ................................ 19, 166
Parking assist ............................ 199
Parking brake ............................ 176
Parking lights ............................. 142
Particulate filter ........................... 167
Performance .............................. 286
Performing work ........................229
Power button .............................. 159
Power outlets ............................... 97
Power seat adjustment ................50
Power windows ............................ 41
Preheating ................................. 111
Puncture ..................................... 265