Opening and closing
The vehicle is factory-fitted with central locking. The enhanced central locking system is a central locking system with additional convenience features. Both locking systems can be combined with an anti-theft alarm system.
The central locking systems will only operate if the vehicle is locked or unlocked using the vehicle key at the driver’s door or the remote control and if both doors are properly closed.
Vehicle key
The vehicle is equipped with a special key system. The engine can only be started using the key coded to the vehicle.
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If a vehicle key is lost, obtaining a replacement is a time-consuming process which is only possible through a Mercedes-Benz Service Centre.
Mercedes-Benz recommends that you always keep an easily accessible spare key with you for emergencies.
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Central locking
Unlocking/locking the door from the outside using the vehicle key
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Unlocking the vehicle using the vehicle key only unlocks the corresponding door.
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Using the release lever to unlock the door from the inside
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 | Door handle |
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Pull the release lever.
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The door is unlocked.
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You can open locked doors from the inside at any time using the release levers.
Locking/unlocking the door centrally from the inside
You can lock and unlock the vehicle centrally from the inside using the door lock switch on the control panel on the driver’s and co-driver’s doors.
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| To lock |
 | Indicator lamp |
 | To unlock |
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Switch unit (driver's door)
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Press switch .
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Indicator lamp flashes. The doors are unlocked.
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Press switch .
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Indicator lamp goes out. The doors are locked.
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Remote control
Vehicles with enhanced central locking system or anti-theft alarm system (ATA):
The remote control works regardless of the direction in which it is pointed. The vehicle can also be unlocked from a distance. To prevent vehicle theft, you should only use the remote control in the immediate vicinity of the vehicle.
Remote control
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If you unlock the vehicle with the radio remote control and do not open the door within 25 seconds, the vehicle locks again automatically.
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Loss of a remote control
If you have lost a remote control, a Mercedes-Benz Service Centre will be able to cancel it. The other remote controls can be recoded.
Enhanced central locking system
The enhanced central locking system is a central locking system with additional features:
Unlocking/locking the door from the outside using the vehicle key
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Unlocking the vehicle using the vehicle key only unlocks the corresponding door.
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Convenience opening using the vehicle key
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Hold the vehicle key in position until:
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Convenience closing using the vehicle key
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Hold the vehicle key in position until
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 | Risk of injury |
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When closing the side windows and the sliding/tilting sunroof, make sure that nobody can become trapped.
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If you wish the sliding/tilting sunroof to remain open, you must activate the sliding/tilting sunroof lock before the locking procedure.more
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Unlocking the driver’s door using the remote control
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Press the  button once.
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The driver’s door is unlocked. All the turn signal lamps on the vehicle flash once.
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Unlocking the vehicle using the remote control
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Press the button twice.
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The driver’s and co-driver’s doors unlock. All the turn signal lamps on the vehicle flash once.
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Locking the vehicle using the remote control (convenience closing)
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Press the  button once.
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The driver’s and co-driver’s doors lock. The side windows and the sliding/tilting sunroof close automatically. All the turn signal lamps on the vehicle flash three times. The anti-theft alarm system is primed.
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Sliding/tilting sunroof lock
Vehicles with the enhanced central locking system:
The lock prevents the sliding/tilting sunroof closing automatically when the vehicle doors are locked. Air circulation can then be maintained in the cab when the vehicle is locked.
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| Lock switch |
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Switching on
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Press the upper section of the  switch.
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The indicator lamp in the switch lights up. The next time the vehicle is locked, the sliding/tilting sunroof will remain open.
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The sliding/tilting sunroof lock is only active when there is no vehicle key in the ignition lock.
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Switching off
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Press the upper section of the switch.
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The indicator lamp in the switch goes out. The lock is deactivated.
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Anti-theft alarm system (ATA)
The anti-theft alarm system is installed in the vehicle to supplement the central locking or the enhanced central locking system. It protects the tractor vehicle and the attached trailer/semitrailer from break-in and theft.
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all doors and exterior flaps on the tractor vehicle, the power supply and the cab tilt lock
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the power supply between the tractor vehicle and the trailer/semitrailer
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the box-type body (option)
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the vehicle interior (can be deactivated)
The primed ATA triggers an alarm if one of the monitored components responds.
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When ATA is activated, it confirms the locking procedure by flashing all turn signals three times. If this does not occur, one or more components are not configured in the basic settings. ATA cannot monitor these components.
Reactivate ATA if you want to fold up flaps after locking or want to later include a coupled trailer in the monitoring.
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The side windows, roof hatch or sliding/tilting sunroof must be locked. The curtains must be closed. No loose objects, e.g. soft toys or coat hangers are allowed to hang loose in the cab.
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Components that are moved to the basic position within 30 seconds of ATA being primed will be monitored.
Vehicles with the enhanced central locking system:
The side windows and the sliding/tilting sunroof close automatically.
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If ATA is activated, the indicator lamp in the ATA switch flashes.
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ATA for GGVSE vehicles (vehicles for the transportation of hazardous goods)
If ATA is activated and the power supply is interrupted with the EMERGENCY OFF switch, the alarm is triggered. The following is shown in the display: Pressing the EMERGENCY OFF switch triggers the alarm!.
Priming or deactivating ATA
You can prime or deactivate ATA:
The vehicle key must be turned fully back in the ignition lock or removed.
Locking the vehicle without ATA
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Hold the vehicle key in the door lock of the driver's door for a maximum of 1 second in position more.
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Lock the vehicle at the co-driver’s door.
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The vehicle locks centrally. ATA is not primed.
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Activate ATA with the vehicle key (with interior monitoring)
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| A | Driver's door on a left-hand-drive vehicle |
| B | Driver's door on a right-hand-drive vehicle |
| To deactivate ATA (unlock door) |
| To prime ATA (lock door) |
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Hold the vehicle key in position until the driver's and co-driver's doors lock and all the turn signals on the vehicle flash 3 times.
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ATA is primed.
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Deactivating ATA using the vehicle key
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Turn the vehicle key to position in the driver’s door lock.
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All the turn signal lamps on the vehicle flash once. ATA is deactivated.
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Activating ATA with the radio remote control (with interior monitoring)
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Press the button once.
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The driver’s and co-driver’s doors lock. All the turn signal lamps on the vehicle flash three times. ATA is primed.
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Deactivating ATA using the remote control
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Press the button once.
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All the turn signal lamps on the vehicle flash once. ATA is deactivated.
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If the driver's door is not opened within 25 seconds, the driver's door locks again automatically. ATA is reactivated.
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Activating ATA from the inside (without interior monitoring)
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| ATA switch |
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Dashboard, centre section
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Press the upper section of the  switch.
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The vehicle locks centrally. The indicator lamp in the switch lights up. After 60 seconds, all the turn signals on the vehicle light up 3 times. ATA is primed.
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Deactivating ATA from the inside
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Press the upper section of the switch once again.
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All the turn signal lamps on the vehicle flash once. ATA is deactivated. The doors remain locked.
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If the engine is started while ATA is activated, ATA switches it off again.
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Activating ATA without interior monitoring
If you want to leave persons or animals locked in the cab, the interior motion sensor must be deactivated.
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| ATA switch |
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Dashboard, centre section
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Press the upper section of the switch.
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The indicator lamp in the switch lights up.
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Exit the vehicle.
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Lock the vehicle from the driver's door with the vehicle key or with the radio remote control more.
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ATA is activated without interior monitoring.
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ATA alarm
The ATA alarm is:
If you insert the vehicle key into the ignition lock and rotate to the radio position , the status indicator lights up in yellow and the following are, for example, indicated in the display:
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If more than one alarm has been triggered, only the first alarm is shown in the display.
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Cancelling the alarm
With the remote control:
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Press the button.
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With the vehicle key in the vehicle door:
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Turn the vehicle key to position in the door lock and hold it there.
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From the inside:
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Press the upper section of the switch.
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Panic alarm
With the panic button an alarm can be triggered manually, for example if danger threatens.
The ATA alarm is:
Triggering the panic alarm
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| ATA switch |
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Dashboard, centre section
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Press the lower section of the  switch.
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The panic alarm is triggered. The driver's and co-driver's doors are locked.
Vehicles with the enhanced central locking system:
The side windows and the sliding/tilting sunroof close automatically.
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| Risk of injury |
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When closing the side windows and the sliding/tilting sunroof, make sure that nobody can become trapped.
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Deactivating the panic alarm
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Press the lower section of the switch.
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The panic alarm is deactivated. The driver's and co-driver's doors remain locked. ATA maintains its previous status.
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Getting into/out of the vehicle
| Risk of injury |
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Dirt and mud on the access steps and entrances impair boarding safety. You could slip off the steps.
Keep access steps, entrances and footwear free from dirt (e.g. mud, clay, snow and ice).
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| Risk of accident |
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Do not remove the key from the ignition lock until the vehicle is stationary, as you will no longer be able to steer the vehicle when there is no key in the ignition lock. Remove the key from the ignition lock when you leave the vehicle, even if you are only leaving for a short while.
Children or unauthorised persons could otherwise endanger themselves and others, for example, by activating electrical functions, releasing the parking brake, starting the engine and/or setting the vehicle in motion.
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| Risk of injury |
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Do not leave children unsupervised in the vehicle even if they are secured in a child restraint system. They could:
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Lower the driver’s suspension seat completely when getting into and out of the vehicle.
Please observe the operating instructions of the seat manufacturer.
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Use the grab handles and steps provided.
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Do not jump down from the cab.
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Ignition lock
| Risk of accident |
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Do not remove the key from the ignition lock until the vehicle is stationary. Once the ignition key is removed you cannot steer the vehicle. You should therefore remove the key when leaving the vehicle, even if you are only leaving it for a short time.
Children or unauthorised persons could endanger themselves or others. They could, for example, activate electrical functions, release the parking brake, start the engine and/or set the vehicle in motion.
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| To insert/remove the vehicle key |
| Steering unlocked/radio position |
| Drive position |
 | Start position |
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Ignition lock
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Vehicles used for the transportation of hazardous goods:
When the key is in position , the battery isolating switch is off. All consumers are disconnected from the batteries, apart from the tachograph.
When the key is in position, the battery isolating switch is in the on position. Most consumers are operational.
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If you turn the vehicle key fully back in the ignition lock when the vehicle lighting is switched on, the battery isolating switch, hazard warning lamps and auxiliary heating will remain on.
When the vehicle key is removed, the steering is locked.
To unlock
or 
switch.
or 
switch until the window is closed.
switch briefly.
switch briefly.
