Page 103 of 473

102 Controls in detail
Locking and unlocking
Illumination of the emergency release 
button:
The button flashes for 30 minutes after 
opening the trunk.
The button flashes for 60 minutes after 
closing the trunk.
Automatic central locking
The doors and the trunk automatically lock 
when the vehicle is set into motion.
You can deactivate the automatic locking 
using the control system, see “Setting 
automatic locking” (
page 146).
Locking and unlocking from the inside
You can lock or unlock the doors and the 
trunk from the inside using the central 
locking or unlocking switch. This can be 
useful, for example, if you want to lock the 
vehicle before starting to drive.
The fuel filler flap will not be locked or 
unlocked with the central locking or 
unlocking switch, respectively.iThe emergency release button unlocks 
the trunk while the vehicle is standing still or 
in motion.
iThe emergency release button does not un-
lock the trunk if the vehicle battery is discharged 
or disconnected.
iIf the vehicle has previously been centrally 
locked with the SmartKey, opening the trunk 
from the inside will trigger the anti-theft alarm 
system.
To cancel the alarm, do one of the following:
Press buttonŒor‹on the 
SmartKey.
Insert the SmartKey in the starter switch.
iYou can open a locked door from the inside. 
Open door only when conditions are safe to do 
so.
iThe doors unlock automatically after an 
accident if the force of the impact exceeds a 
preset threshold.
The vehicle locks automatically when the ignition 
is switched on and the wheels are turning at a 
vehicle speed of approximately 9 mph (15 km/h) 
or more. You could therefore lock yourself out 
when the vehicle
is pushed or towed
is on a test stand
Warning!G
When leaving the vehicle, always remove the 
SmartKey from the starter switch, take it 
with you, and lock the vehicle. Do not leave 
children unattended in the vehicle, or with 
access to an unlocked vehicle. A child’s 
unsupervised access to a vehicle could 
result in an accident and/or serious 
personal injury. 
     
        
        Page 315 of 473

314 Operation
Tires and wheels
Tire inflation pressure changes by approxi-
mately 1.5 psi (0.1 bar) per 18°F (10°C) of 
air temperature change. Keep this in mind 
when checking tire inflation pressure 
where the temperature is different from 
the outside temperature.
Checking tire inflation pressure
Regularly check your tire inflation pressure 
at least once a month.
Check and adjust the tire inflation 
pressure when the tires are cold. The tires 
can be considered cold if the vehicle has 
been parked for at least 3 hours or driven 
less than 1 mile (1.6 km).
If you check the tire inflation pressure 
when the tires are warm (the vehicle has 
been driven for several miles or sitting less 
than 3 hours), the reading will be 
approximately 4 psi (0.3 bar) higher than 
the cold reading. This is normal. Do not let 
air out to match the specified cold tire in-
flation pressure. Otherwise, the tire will be 
underinflated.Checking tire inflation pressure 
manually
Follow the steps below to achieve correct 
tire inflation pressure:
Remove the cap from the valve on one 
tire.
Firmly press a tire gauge onto the 
valve.
Read tire inflation pressure on tire 
gauge and check against the recom-
mended tire inflation pressure on the 
Tire and Loading Information placard 
on the driver’s door B-pillar 
(
page 307). If necessary, add air to 
achieve the recommended tire inflation 
pressure.
Install the valve cap.
Repeat this procedure for each tire.
Warning!G
Follow recommend tire inflation pressures.
Do not underinflate tires. Underinflated tires 
wear excessively and/or unevenly, 
adversely affect handling and fuel economy, 
and are more likely to fail from being over-
heated.
Do not overinflate tires. Overinflated tires 
can adversely affect handling and ride 
comfort, wear unevenly, increase stopping 
distance, and result in sudden deflation 
(blowout) because they are more likely to 
become punctured or damaged by road 
debris, potholes etc.
Do not overload the tires by exceeding the 
specified load limit as indicated on the Tire 
and Loading Information placard on the 
driver’s door B-pillar. Overloading the tires 
can overheat them, possibly causing a 
blowout. Overloading the tires can also 
result in handling or steering problems, or 
brake failure.
iIf you have overfilled the tire, release tire in-
flation pressure by pushing the metal stem of the 
valve with e.g. a tip of a pen. Then recheck the 
tire inflation pressure with the tire gauge. 
     
        
        Page 390 of 473

389 Practical hints
Unlocking/locking in an emergency
Insert mechanical key 2 into the 
driver’s door lock until it stops.
Turn mechanical key 2 clockwise to 
position1.
The driver’s door is locked.
Turn back mechanical key 2 and 
remove it from driver’s door lock.Manually unlocking the gear selector 
lever (automatic transmission*)
In case of power failure, the gear selector 
lever can be manually unlocked, e.g. to tow 
the vehicle.
1Gear selector lever cover
2Release
Insert flat, blunt object (e.g. screw-
driver) into the left edge of cover1 at 
the position indicated by the arrows.
Loosen cover1 using this object.
Using your hands, pull cover1 out 
and remove.
Push down and hold release2 in 
direction of arrow.
Simultaneously move gear selector 
lever out of positionP.
The gear selector lever is unlocked 
now.1Locking
2Mechanical key
iThis procedure does not arm the anti-theft 
alarm system, nor does it lock the fuel filler flap.
iThe gear selector lever is locked again as 
soon as you place it in positionP again.