Fig. 66 In the roof: button for the glass roof.
The term glass roof is used as a standard term for the panorama sliding/tilting roof.
The glass roof is a roof opening system featuring two glass elements. The rear glass element is fixed
and cannot be opened.
The button has two positions. First stage: fully or partially tilt, open or close the roof. Second
stage: automatically move the roof to the respective limit position. Press the button again to stop
the one-touch function.
Tilting the glass roof: push the button ⇒ Fig. 66Ⓑ to the first position. One-touch function: push
button Ⓑ to the second position.
Closing the tilted glass roof: push the button Ⓐ to the first position. One-touch function: push
button Ⓐ to the second position.
Opening the glass roof: push the button Ⓒ to the first position. One-touch function up to
convenience position: push button Ⓒ to the second position.
Closing the glass roof: push the button Ⓓ to the first position. One-touch function: push button Ⓓ
to the second position.
Stopping one-stop function of the opening or closing procedure: push button Ⓒ or Ⓓ again.
WARNING
Careless or unsupervised use of the glass roof can cause serious injuries.
Open and close the glass roof only when you are sure that nobody is obstructing the path of the
roof.
Always take all vehicle keys with you every time you leave the vehicle.
Never leave children or people requiring assistance alone in the car, particularly if they have access
to the vehicle key. Unsupervised use of the vehicle key can lock the vehicle, start the engine, switch
on the ignition and operate the glass roof.
The glass roof can still be opened or closed for a short time after the ignition has been switched off,
provided that the driver door or front passenger door are not opened.
NOTICE
To avoid damage during cold weather, clear any ice and snow off the vehicle roof before opening or
tilting the glass roof.
Always close the glass roof when you leave the vehicle or if it starts to rain. Any rain entering the
vehicle when the glass roof is open or tilted could cause significant damage to the electrical system.
This can result in further damage to the vehicle.
Remove leaves and other loose items from the glass roof guide rails at regular intervals using a
vacuum cleaner, or by hand.
The roll-back function will not work properly if there is a malfunction in the glass roof. Go to a
qualified workshop.
Convenience opening or closing of the glass roof
Convenience opening and closing
The glass roof can be opened and closed from outside the vehicle using the vehicle key:
Press and hold the locking or unlocking button on the vehicle key. The glass roof is tilted or closed.
In vehicles with the Keyless Access locking and starting system: place your finger on the locking
sensor in the door handle for a few seconds until the glass roof is closed ⇒ Unlocking or locking the
vehicle with Keyless Access .
Release the locking or unlocking button to interrupt this function.
The convenience closing function closes all the windows in the doors and the glass roof. All turn
signals will flash once as confirmation that all the windows and the glass roof have been closed.
Make settings for operation of the glass roof in the Vehicle settings menu in the Infotainment
system ⇒ Infotainment system controls and displays .
Some settings can be saved in the user accounts for personalisation and therefore change
automatically when the user account is changed ⇒ Personalisation .
Glass roof roll-back function
The roll-back function reduces the risk of crush injuries ⇒ . If the glass roof is obstructed during
the closing process, it will open again immediately.
Check to see why the glass roof has not closed.
Try to close the glass roof again.
If the glass roof still cannot be closed, close it without the roll-back function.
Closing the glass roof without the roll-back function
Press the button to the second position Ⓓ until the glass roof has fully closed.
The glass roof will now close without the roll-back function.
Please go to a qualified workshop if the glass roof still cannot be closed.
If you release the switch during the closing procedure, the glass roof will open automatically.
If the vehicle key has been removed from the ignition lock and the driver door opened, acoustic
warnings sound under the following conditions:
If the parking light is switched on.
If the side lights are switched on or the rear fog light is switched on .
When the Coming Home function is switched on, no signal tone will be given as a reminder that a
light is still switched on when leaving the vehicle.
Some settings can be stored in the user accounts of the personalisation function and therefore
change when the user account changes ⇒ Personalisation .
Troubleshooting
Turn signal indicator lamp
If a turn signal on the vehicle has failed, the indicator lamp will start flashing twice as fast.
The indicator lamp flashes green.
Check the lighting and change the appropriate bulb as required ⇒ Changing bulbs .
If the problem persists, go to a qualified workshop.
Does not apply in China and Japan: trailer turn signals indicator lamp
The indicator lamp goes out if a trailer turn signal or all trailer lights stop working.
The indicator lamp flashes green.
Check the lighting and change the appropriate bulb as required ⇒ Changing bulbs .
If the problem persists, go to a qualified workshop.
Vehicle lighting not working
Vehicle lighting has failed either completely or partially.
The indicator lamp lights up yellow.
Check the lighting and change the appropriate bulb as required ⇒ Changing bulbs .
If the problem persists, go to a qualified workshop.
Fault in rain/light sensor
In the light switch position , the vehicle lighting is not switched on or off automatically.
The indicator lamp lights up yellow.
Switch the ignition off and on.
If the problem persists, go to a qualified workshop.
Starting and stopping the engine
Ignition lock
Fig. 99 To the right of the steering wheel: positions of the vehicle key in the ignition lock.
When there is no vehicle key in the ignition lock, the steering column lock may be activated.
Vehicle key positions ⇒ Fig. 99
Ignition switched off. The vehicle key can be removed.
Ignition switched on. Steering lock can be released. The diesel engine is pre-heated and the
indicator lamp lights up yellow.
Depress the brake pedal when the indicator lamp lights up green. Start the engine. Release
the vehicle key as soon as the engine starts. Once released, the vehicle key moves back to position
⇒ Fig. 99① .
Ignition switched on warning
A warning message appears in the instrument cluster display if the driver door is opened while the
ignition is switched on. A signal tone may also be given.
The warning is a reminder that the ignition must be switched off before leaving the vehicle.
WARNING
Improper or unsupervised use of the vehicle keys can cause accidents or serious injuries.
Always take all vehicle keys with you every time you leave the vehicle. The engine can be started and
electrical equipment such as the window controls can be operated. This can cause serious injury.
Never leave children or people requiring assistance alone in the vehicle when the vehicle is locked.
They could become trapped in the vehicle in an emergency and may not be able to get themselves
to safety. For example, locked vehicles may be subjected to very high or very low temperatures
depending on the season. This can cause serious injuries and illness or fatalities, especially in the
case of small children.
Never remove the vehicle key from the ignition if the vehicle is in motion. The steering column lock
may be activated and you will no longer be able to steer the vehicle.
The key bit in the vehicle key must be folded out fully and locked in position.
Only attach light objects weighing less than 100 g to the vehicle key.
NOTICE
The 12-volt battery may be discharged unintentionally and prevent the engine from restarting if the
ignition is switched on while the engine is switched off.
Always switch off the ignition before you leave the vehicle.
For vehicles with DSG dual clutch gearbox in some markets: if the vehicle key cannot be
removed from the ignition lock when the vehicle is stopped, move the selector lever to P. If
necessary, press the lock button in the selector lever and then release it.
Starter button
The starter button replaces the ignition lock (Press & Drive).
Fig. 100 In the lower section of the centre console: starter button for starting the engine.
The starter button is used to start the vehicle (Press & Drive).
The vehicle can be activated only if there is a valid vehicle key in the vehicle.
When leaving the vehicle, the electronic steering column lock will be activated when the ignition is
switched off and the driver door is opened ⇒ Steering .
Switching the ignition on and off
Press the starter button once without depressing the brake or clutch pedal ⇒ .
Automatic ignition switch-off
The ignition switches off automatically after a short time if the driver moves away from the vehicle
with the vehicle key when the ignition is switched on. If the dipped beam headlights were switched
on at the time, the side lights will remain switched on for approximately 30 minutes. The side lights
can be switched off manually or by locking the vehicle ⇒ Lights .
Automatic ignition switch-off in vehicles with a start/stop system
When all the following conditions are fulfilled at the same time, the vehicle ignition will be switched
off automatically when engine stop is active when the vehicle is stationary:
The driver seat belt has been unfastened.
No pedals are depressed.
The driver door is opened.
If the ignition is deactivated automatically while the dipped beam headlights are switched on,
the side lights remain switched on and lit for approximately 30 minutes.
The side lights can be switched off manually or will go off when the vehicle is locked.
Engine restart function
If no valid vehicle key is detected in the vehicle interior once the engine has been switched off, the
engine can be restarted within approximately five seconds. A corresponding message appears on the
instrument cluster display.
After this time, the engine cannot be re-started without a valid vehicle key in the vehicle interior.
WARNING
Unintentional vehicle movements can cause serious injury.
Do not depress the brake or clutch pedal when the ignition is switched on as the engine will start
immediately.
WARNING
Improper or unsupervised use of the vehicle keys can cause accidents or serious injuries.
Always take all vehicle keys with you every time you leave the vehicle. Children or unauthorised
persons could lock the vehicle, start the engine, switch on the ignition or operate electrical
equipment such as the electric windows.
Before leaving the vehicle, always switch off the ignition manually and observe any information
shown on the instrument cluster display.
Leaving the vehicle stationary for long periods with the ignition switched on can discharge the 12-
volt vehicle battery so that the engine can no longer be started.
Starting the engine
Vehicles with ignition lock: turn the vehicle key to position ⇒ Fig. 99① . The ignition is
switched on.
Vehicles with a starter button: press the starter button once. The ignition is switched on.
Vehicles with a diesel engine: during the diesel engine preheating phase, the indicator lamp
lights up in the instrument cluster.
Depress and hold the brake pedal until the electronic parking brake has been switched off.
Vehicles with manual gearbox: fully depress the clutch pedal and hold it until the engine has
been started. Move the gear lever to neutral position.
Vehicles with DSG dual clutch gearbox: move the selector lever to position P or N.
Vehicles with ignition lock: turn the vehicle key to position ⇒ Fig. 99② – do not depress the
accelerator.
Release the vehicle key once the engine has started.
Vehicles with a starter button: press the starter button ⇒ Starter button – do not depress the
accelerator. There must be a valid vehicle key in the vehicle before the engine can be started.
If the engine does not start immediately, switch off the starter and try again after about a minute.
Vehicles with starter button: perform an emergency start if necessary ⇒ No valid vehicle key
recognised .
Vehicles with starter button: the starter button is deactivated if the vehicle was locked with the
vehicle key. If you are in the vehicle and need to start the engine, unlock the vehicle first or perform
an emergency start ⇒ No valid vehicle key recognised .
Switch off the electronic parking brake if you wish to pull away.
WARNING
The risk of serious injury can be reduced with the engine running or when starting the engine.
Never start or run the engine in unventilated or enclosed spaces. The exhaust fumes contain carbon
monoxide, an odourless and colourless toxic gas. Carbon monoxide can cause people to lose
consciousness. It can also cause death.
Never start or run the engine if oil, fuel or any other highly flammable fluids are under or near the
vehicle, or are leaking out of the vehicle, e.g. as the result of damage.
Never leave the vehicle unattended with the engine running, particularly if a gear or driving position
has been selected. The vehicle could move suddenly or something unexpected may happen that may
cause damage, fire and serious injuries.
Never use a start booster. Start boosters could explode and cause the engine to suddenly run at high
revs.
WARNING
Never leave the engine running if you leave the vehicle unattended, particularly if a gear or position
has been selected. The vehicle could move suddenly or something unexpected may happen that may
cause damage, fire or serious injuries.
WARNING
Start boosters could explode or cause the engine to suddenly run at high revs.
Never use a start booster.
NOTICE
The starter and the engine can be damaged if you attempt to start the engine while the vehicle is in
motion or if the engine is started again immediately after it has been switched off.
When the engine is cold, avoid high engine speeds, driving at full throttle and overloading the
engine.
Do not push start or tow start the vehicle. Unburnt fuel could damage the catalytic converter.
NOTICE
If the engine does not start, never use the starter with a gear selected and the vehicle key in the
ignition lock in position ⇒ Fig. 99② for driving or tow-starting, e.g. when the fuel tank is empty.
This could cause damage to the starter.
Fill up with fuel if necessary ⇒ Fuel types and refuelling or jump start the vehicle ⇒ Jump starting .
If the engine does not start, seek expert assistance.
Do not warm up the engine by running it while the vehicle is stationary. Instead, pull off as soon as
there is good visibility through the windows. This helps the engine reach operating temperature
faster and reduces emissions.