Page 36 of 430

33 Central locking system
Te ch n i c a l
data Instruments 
and controlsOperationDrivingInstrument 
cluster displayPractical hints Car care Index Central locking system
Radio frequency and infrared remote control
The electronic key has an integrated radio frequency 
and infrared remote control.
Due to the extended operational range of the remote 
control, it could be possible to unintentionally lock or 
unlock the vehicle by pressing the transmit button. If 
one of the transmit buttons is pressed, the battery check 
lamp lights up briefly – indicating that the batteries are 
in order. See page 371 for checking batteries.
The vehicle doors, trunk and fuel filler flap can be 
centrally locked and unlocked via remote control.
Opening and closing the windows and sliding/pop-up 
roof and switching on the driver’s seat ventilation can 
only be done with the infrared portion of the remote 
control. Aim transmitter eye at a receiver (6 or 7), press 
and hold transmit button Œor ‹, seepage43.
With vehicle centrally locked, the trunk can also be 
opened by using the remote control.
If the electronic key is inserted in starter switch, the 
vehicle cannot be locked or unlocked, and the trunk lid 
cannot be opened with the remote control.1Transmit button
‹ Locking
Œ Unlocking
Š Opening trunk (if not separately locked)
2Lamp for battery check (see page 371 for changing 
batteries if it does not light up briefly)
3PANIC button
4Transmitter eye
5Locking tab for mechanical key
P80.35-2032-26
24
3
5
1 
     
        
        Page 44 of 430
41 Central locking system
Te ch n i c a l
data Instruments 
and controlsOperationDrivingInstrument 
cluster displayPractical hints Car care Index Choosing global or selective mode 
on KEYLESS-GO-card
To choose between the selective or global opening mode 
press and hold button (1) until the indicator lamp at the 
requested symbol (2) or (3) comes on.Checking last KEYLESS-GO-card locking mode
Briefly press button (1). The indicator lamp (2) or (3) 
lights up in red (vehicle locked) or in green (vehicle 
unlocked).
P80.30-2027-26
1
2
3 
     
        
        Page 74 of 430

71 Seats
Te ch n i c a l
data Instruments 
and controlsOperationDrivingInstrument 
cluster displayPractical hints Car care Index 4Massage function(PULSE)
The multicontour backrest is equipped with a 
massage function to help prevent fatigue during 
longer journeys.
The PULSE function inflates and deflates the air 
cushions in the backrest rhythmically.
An indicator lamp on the switch lights up when the 
PULSE function is switched on. The PULSE function 
switches off automatically after approximately 
5minutes.
Note:
If the top cushion is inflated, only the middle air 
cushion is inflated and deflated.Seat heater
The seat heaters can be switched on with the electronic 
key in starter switch positions 1 or 2. 
The buttons are located on each door.
Note:
When in operation, the seat heater consumes a large 
amount of electrical power. It is not advisable to use the 
seat heater longer than necessary.
The seat heaters may automatically switch off if too 
many power consumers are switched on at the same 
time or if the battery charge is low. In this case, one or 
both indicator lamps will blink. 
The seat heaters switch back on again automatically as 
soon as sufficient voltage is available.
If the blinking of the indicator lamps is distracting to 
you, the seat heaters can be switched off. 
     
        
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72 Seats
Te ch n i c a l
data Instruments 
and controlsOperationDrivingInstrument 
cluster displayPractical hints Car care Index
Vehicles without seat ventilation function:
Normal heating mode.
Press button (1):
One indicator lamp in the switch lights up. 
The seat heater will be automatically switched off after 
approximately 30 minutes.
Rapid heating mode.
Press button (2):
Both indicator lamps in the switch light up.
The system switches over to normal heating mode 
automatically after approximately 5 minutes.
Turning off the heater.
Press button (1) or (2) again:
The indicator lamps go out. The seat heater is switched 
off.
1
2
P54.25-2005-26 
     
        
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73 Seats
Te ch n i c a l
data Instruments 
and controlsOperationDrivingInstrument 
cluster displayPractical hints Car care IndexVehicles with seat ventilation function:
Rapid heating mode
Press button (3) once.
Both indicator lamps above the button light up.
The system switches over to normal heating mode 
automatically after approximately 5 minutes.
Normal heating mode
Press button (3) twice:
One indicator lamp above the button lights up.
The seat heater will be automatically switched off after 
approximately 30 minutes.
Turning off the heater.
Press the button again:
The indicator lamps go out. The seat heater is switched 
off.
3
P54.25-2004-26 
     
        
        Page 78 of 430
75 Seats
Te ch n i c a l
data Instruments 
and controlsOperationDrivingInstrument 
cluster displayPractical hints Car care Index Manual activation:
Turn the electronic key in starter switch to position 1 
or 2.
Level 3 ventilation setting (maximum).
Press button (1):
Three blue indicator lamps above the button light up.Level 2 ventilation setting (middle).
Press button (1) again:
Two blue indicator lamps above the button light up. 
Level 1 ventilation setting (minimum).
Press button (1) again:
One blue indicator lamp above the button lights up. 
Turning off the seat ventilation.
Press button (1) again:
The indicator lamps go out. Seat ventilation is switched 
off.
1
P54.25-0423-26 
     
        
        Page 162 of 430

159 Exterior lamp switch
Te ch n i c a l
data Instruments 
and controlsOperationDrivingInstrument 
cluster displayPractical hints Car care Index Headlamp mode
Manual headlamp mode
The low beam headlamps and parking lamps can be 
switched on and off with the exterior lamp switch. For 
exterior lamp switch, see page 158.
Note:
With the daytime running lamp mode activated and the 
engine running, the low beam headlamps cannot be 
switched off manually. See page 160 for notes on the 
daytime running lamp mode.Automatic headlamp mode
Turn exterior lamp switch to positionU.
•Electronic key in starter switch position 1:
The parking lamps switch on and off automatically 
depending on the brightness of the ambient light.
•Electronic key in starter switch position 2 and the 
engine running:
The low beam headlamps and parking lamps are 
switched on and off automatically depending on the 
brightness of the ambient light.
The low beam headlamps and parking lamps can 
still be switched on and off manually using the 
exterior lamp switch.
Note:
With the daytime running lamp mode activated, the low 
beam headlamps cannot be switched off automatically.
The headlamps will not be automatically switched on 
under foggy conditions.
Front fog lamps and rear fog lamp cannot be switched 
on manually with exterior lamp switch in positionU. 
To activate the fog lamps turn exterior lamp switch to 
positionB.
Wa r n i n g !
The driver is responsible for the operation of the 
vehicle’s lights at all times. The automatic 
headlamp feature is only an aid to the driver. 
Switch on the vehicle lights by hand when driving 
or traffic conditions require you to do so. 
     
        
        Page 177 of 430

174 Automatic climate control
Te ch n i c a l
data Instruments 
and controlsOperationDrivingInstrument 
cluster displayPractical hints Car care Index
Air recirculation
Select air recirculation:
The indicator lamp in the O button is not 
illuminated. 
Press button O briefly. The indicator lamp in the 
button illuminates. 
To switch off the air recirculation:
The indicator lamp in the O button is illuminated.
Press button O briefly. The indicator lamp in the 
button will go out. 
Switching on air recirculation and activating 
convenience closing of power windows and sliding /
pop-up roof:
The indicator lamp in the O button is not 
illuminated.
Press button O for more than 2 seconds, the side 
windows and the sliding / pop-up roof will be closed. The 
indicator lamp in the button lights up.Switching off air recirculation and activating 
convenience opening of power windows and sliding /
pop-up roof:
The indicator lamp in the O button is illuminated.
Press button O for more than 2 seconds, the side 
windows and the sliding / pop-up roof return to the 
position they were in before closing.
A window or the sliding / pop-up roof opened manually 
after convenience closing will no longer be returned to 
the position it was in before closing when convenience 
opening is selected.
The system automatically switches from air 
recirculation to fresh air:
•after 30 minutes if the outside temperature is above 
about 40
°F(5
°C),
•after 5 minutes if the outside temperature is below 
about 40
°F(5
°C),
•after 5 minutes if economy mode AC
OFF is selected.
The system switches automatically to air recirculation at 
high outside temperatures. A quantity of outside air is 
added after a maximum of 30 minutes. 
If the windows should fog up from the inside, switch 
from recirculated air back to fresh air.