Locking and unlocking
In the “Controls in detail” section you will find detailed information on how to operate the equipment installed on your vehicle. If you are already familiar with the basic functions of your vehicle, this section will be of particular interest to you.
To quickly familiarize yourself with the basic functions of the vehicle, refer to the “Getting started” section of this manual. The corresponding page numbers are given at the beginning of each segment.
For more information on locking and unlocking, see “Getting started” (▷ page 32) and (▷ page 57).
SmartKey
Your vehicle comes supplied with two SmartKeys, each with remote control and a removable mechanical key.
The locking tabs for the mechanical key portion of the two SmartKeys are a different color to help distinguish each SmartKey unit.
The SmartKey provides an extended operating range. To prevent theft, however, it is advisable to only unlock the vehicle when you are in close proximity to it.
The SmartKey centrally locks and unlocks:
- the doors
- the trunk
- the fuel filler flap
SmartKey with remote control
① Lock button
② Opening button for trunk
③ Mechanical key locking tab
④ Unlock button
⑤ Battery check lamp
⑥ Panic button* (▷ page 86)
i Canada only:
Only vehicles equipped with an anti-theft alarm system* have SmartKeys with integrated panic button ⑥.
Locking and unlocking
Warning!
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. It is possible for children to open a locked door from the inside, which could result in an accident and/or serious injury.
! To prevent possible malfunction, avoid exposing the SmartKey to high levels of electromagnetic radiation.
i USA only: This device complies with Part 15 of the FCC Rules. Operation is subject to the following two conditions: (1) This device may not cause harmful interference, and (2) this device must accept any interference received, including interference that may cause undesired operation.
Any unauthorized modification to this device could void the user's authority to operate the equipment.
i Canada only: This device complies with RSS-210 of Industry Canada. Operation is subject to the following two conditions: (1) This device may not cause interference, and (2) this device must accept any interference received, including interference that may cause undesired operation of the device.
Any unauthorized modification to this device could void the user's authority to operate the equipment.
i You can also open or close the power windows and the tilt/sliding sunroof* using the SmartKey, see "Summer opening feature" (▷ page 243) and "Convenience closing feature" (▷ page 243).
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Locking and unlocking
Factory setting
Global unlocking
▶ Press button [icon].
All turn signal lamps flash once. The locking knobs in the doors move up. The anti-theft alarm system* is disarmed.
The vehicle will lock again automatically and reactivate the anti-theft alarm system* within approximately 40 seconds of unlocking if:
- neither a door nor the trunk is opened
- the SmartKey is not inserted in the starter switch
- the central locking switch is not activated
Global locking
▶ Press button [icon].
With the hood, trunk and all doors closed, all turn signal lamps flash three times. The locking knobs in the doors move down. The anti-theft alarm system* is armed.
Selective setting
If you frequently travel alone, you may wish to reprogram the SmartKey so that pressing [icon] only unlocks the driver’s door and the fuel filler flap.
▶ Press and hold buttons [icon] and [icon] simultaneously for about 5 seconds.
Battery check lamp ⑤ flashes twice.
The SmartKey will then function as follows:
Unlocking driver’s door and fuel filler flap
▶ Press button [icon] once.
All turn signal lamps flash once. The locking knob in the driver’s door moves up. The anti-theft alarm system* is disarmed.
Global unlocking
▶ Press button [icon] twice.
All turn signal lamps flash once. The locking knobs in the doors move up. The anti-theft alarm system* is disarmed.
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Locking and unlocking
Global locking
► Press button [lock icon].
With the trunk and all doors closed, all turn signal lamps flash three times. The locking knobs in the doors move down. The anti-theft alarm system* is armed.
Restoring to factory setting
► Press and hold buttons [unlock icon] and [lock icon] simultaneously for about 6 seconds until battery check lamp ⑤ flashes twice.
The SmartKey is set to factory setting again.
! If you can no longer lock or unlock the vehicle with the SmartKey, then either the batteries in the SmartKey are discharged, the SmartKey is malfunctioning or the vehicle battery is drained.
- Check the batteries in the SmartKey (▷ page 101) and replace them if necessary (▷ page 396).
- Use the mechanical key to unlock the driver's door (▷ page 389) and the trunk (▷ page 390).
- Use the mechanical key to lock the driver's door (▷ page 390) and the trunk (▷ page 106).
- Have the vehicle battery and the battery connections checked (▷ page 412).
If the SmartKey is malfunctioning, contact an authorized Mercedes-Benz Center.
Checking the batteries
► Press button [lock icon] or [unlock icon].
Battery check lamp ⑤ comes on briefly to indicate that the SmartKey batteries are in order.
i If battery check lamp ⑤ does not come on briefly during check, then the SmartKey batteries are discharged.
Replace the batteries (▷ page 396).
You can obtain the required batteries at any authorized Mercedes-Benz Center.
i If the batteries are checked within signal range of the vehicle, pressing the [lock icon] or [unlock icon] button will lock or unlock the vehicle accordingly.
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Locking and unlocking
Unlocking and opening the trunk
You can unlock and open the trunk separately.
A minimum height clearance of 5.71 ft (1.74 m) is required to open the trunk lid.
- Press button [icon] until trunk lid unlocks and begins to open.
! The trunk lid swings open upwards automatically. Always make sure there is sufficient overhead clearance.
i If the trunk does not open, it is still locked separately (▷ page 106).
Loss of SmartKey or mechanical key
If you lose a SmartKey or mechanical key, you should do the following:
- Have the SmartKey deactivated by an authorized Mercedes-Benz Center.
- Report the loss of the SmartKey or the mechanical key immediately to your car insurance company.
- If necessary, have the mechanical lock replaced.
Your authorized Mercedes-Benz Center will be glad to supply you with a replacement.
Opening the doors from the inside
You can open a locked door from the inside. Open door only when conditions are safe to do so.
① Locking knob ② Inside door handle
i If the vehicle has previously been locked with the SmartKey, opening a door from the inside will trigger the anti-theft alarm system*.
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To cancel the alarm, do one of the following:
- Press button or on the SmartKey.
- Insert the SmartKey in the starter switch.
Front doors
▶ Pull on door handle ② on the respective front door to open door.
If door was locked, locking knob ① will move up.
Rear doors
▶ Pull up locking knob ① on the respective rear door to unlock door.
▶ Pull on door handle ② on the respective rear door to open door.
Opening the trunk
Opening the trunk from the outside
A minimum height clearance of 5.71 ft (1.74 m) is required to open the trunk lid.
The handle is located above the rear license plate recess.
① Handle
The vehicle must be unlocked.
▶ Pull on handle ①.
The trunk opens.
! The trunk lid swings open upwards automatically. Always make sure there is sufficient overhead clearance.
If the trunk does not open, it is still locked separately (▷ page 106).
The trunk can also be opened using button on the SmartKey or from its inside in an emergency, see "Trunk emergency release" (▷ page 105).
Controls in detail
Locking and unlocking
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Locking and unlocking
Opening the trunk from the inside
You can open the trunk from the inside if the vehicle is stationary.
A minimum height clearance of 5.71 ft (1.74 m) is required to open the trunk lid.
The remote trunk opening switch is located on the driver's door.
① Remote trunk opening switch with indicator lamp
▶ Press switch ① until the trunk begins to open.
The indicator lamp in the switch remains lit as long as the trunk is open.
! The trunk lid swings open upwards automatically. Always make sure there is sufficient overhead clearance.
i If the trunk does not open, it is still locked separately (▷ page 106).
The trunk can also be opened using button [icon] on the SmartKey or from its inside in an emergency, see "Trunk emergency release" (▷ page 105).
Closing the trunk
① Handle Handles
▶ Lower trunk lid by pulling firmly on handle ① or handles ②.
▶ Close trunk lid with hands placed flat on the trunk lid.
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Locking and unlocking
Trunk emergency release
With the emergency release button, the trunk can be opened from inside the trunk.
The emergency release button is located on the inside of the trunk lid.
① Emergency release button
▶ Briefly press emergency release button ①.
The trunk unlocks and the trunk lid opens.
! The trunk lid swings open upwards automatically.
Warning!
To prevent possible personal injury, always keep hands and fingers away from the trunk opening when closing the trunk. Be especially careful when small children are around.
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. Unsupervised use of vehicle equipment may cause an accident and/or serious personal injury.
Warning!
Only drive with the trunk closed as, among other dangers such as a blocked visibility, exhaust fumes may enter the vehicle interior.
i Do not place the SmartKey in the open trunk. You may lock yourself out.
i If the vehicle was previously centrally locked, the trunk will lock automatically after closing it. The turn signals will flash three times to confirm locking.
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Locking and unlocking
Illumination of the emergency release button:
- The button flashes 30 minutes after opening the trunk.
- The button flashes 60 minutes after closing the trunk.
i The emergency release button unlocks and opens the trunk while the vehicle is standing still or in motion.
i The emergency release button does not open the trunk lid if the vehicle battery is discharged or disconnected.
i If the vehicle has previously been locked with the SmartKey, opening the trunk from the inside using the emergency release button will trigger the anti-theft alarm system*.
To cancel the alarm, do one of the following:
- Press button [icon] or [icon] on the SmartKey.
- Insert the SmartKey in the starter switch.
Valet locking
i To deny any unauthorized person access to the trunk, lock it separately with the mechanical key. Leave only the SmartKey less its mechanical key with the vehicle.
The lock is located next to the handle above the rear license plate recess.
① Neutral position ② Locked
▶ Close the trunk (▷ page 104).
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Locking and unlocking
- Pull the mechanical key out of the SmartKey (▷ page 389).
- Insert the mechanical key in the trunk lid lock.
- Turn the mechanical key clockwise to position ② and remove the mechanical key in that position to lock the trunk.
The trunk remains locked even when the vehicle is centrally unlocked.
You can only cancel the separate trunk locking mode by means of the mechanical key.
- Insert the mechanical key in the trunk lid lock.
- Turn the mechanical key counterclockwise to neutral position ① and remove the mechanical key in that position to unlock the trunk.
You can now open the trunk (▷ page 103).
Automatic central locking
The doors and the trunk automatically lock when the ignition is switched on and the wheels are turning at vehicle speeds of approximately 9 mph (15 km/h) or more.
You can open a locked door from the inside. Open door only when conditions are safe to do so.
The doors unlock automatically after an accident if the force of the impact exceeds a preset threshold.
To prevent the vehicle door locks from locking, deactivate the automatic central locking when the vehicle
- is pushed or towed
- is on a test stand
You can deactivate the automatic locking mode using the control system, see "Set automatic locking" (▷ page 152).
Locking and unlocking from the inside
You can lock or unlock the doors and the trunk from 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.
You cannot lock or unlock the fuel filler flap with the central locking or unlocking switch.
Warning! 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. Unsupervised use of vehicle equipment may cause an accident and/or serious personal injury.
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Locking and unlocking
The switches are located in the center console.
① Central locking switch ② Central unlocking switch
i You can open a locked door from the inside. Open door only when conditions are safe to do so.
If the vehicle was previously centrally locked using the SmartKey, it will not unlock using the central unlocking switch ②.
If the vehicle was previously locked with the central locking switch ①
- while in the selective remote control mode, only the door opened from the inside is unlocked.
- while in the global remote control mode, the complete vehicle is unlocked when a door is opened from the inside.
Locking
▶ Press central locking switch ①. If all doors are closed, the vehicle locks.
Unlocking
▶ Press central unlocking switch ②. The vehicle unlocks.
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Seats
▼ Seats
For information on seat adjustment, see “Adjusting” (▷ page 35).
Front seat active head restraints
Warning!
For your protection, drive only with properly positioned head restraints.
Adjust head restraint so that the head restraint supports the back of the head at eye level. This will reduce the potential for injury to the head and neck in the event of an accident or similar situation.
Do not drive the vehicle without the seat head restraints. Head restraints are intended to help reduce injuries during an accident.
You cannot remove the active head restraints on the driver’s and passenger’s seat.
For removal of the active head restraints we recommend that you contact an authorized Mercedes-Benz Center.
Adjust the head restraint in such a way that it is as close to the head as possible.
For information on head restraint adjustment, see “Seats” (▷ page 35).
For information on active head restraints, see “Active head restraint” (▷ page 73).
Rear seat head restraints
Warning!
For safety reasons, always drive with the rear head restraints in the upright position when the rear seats are occupied.
Keep the area around head restraints clear of articles (e.g. clothing) to not obstruct the folding operation of the head restraints.
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Seats
Head restraint height (rear outer seats)
① Release button
Raising
- Manually adjust the height of the head restraint by pulling it upward.
If the head restraint is fully retracted, push release button ① and pull the head restraint out.
Lowering
- To lower the head restraint, push release button ① and push down on the head restraint.
Adjust the head restraint in such a way that it is as close to the head as possible.
Warning!
For your protection, drive only with properly positioned head restraints.
Adjust head restraint so that the head restraint supports the back of the head at eye level. This will reduce the potential for injury to the head and neck in the event of an accident or similar situation.
Do not drive the vehicle without the seat head restraints. Head restraints are intended to help reduce injuries during an accident.
Folding head restraints back with release button
The rear seat head restraints can be folded backward for increased visibility.
① Release button
- Push release button ①.
The head restraint will fold backward.
You can also fold the rear outer seat head restraints back using the switch in the center console (▷ page 111).
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Seats
Folding head restraints back with switch in the center console
① Switch for rear seat head restraints ► Start the engine (▷ page 48). ► Press switch ①. The rear seat head restraints will fold backward.
Placing head restraints upright
► Pull the head restraint forward until it locks into position.
Warning! Make sure the head restraints engage when placing them upright. Otherwise their protective function cannot be assured.
Head restraint tilt (rear outer seats) Two different head restraint angle positions are available: ► Press the release button (▷ page 110) and tilt the head restraint to the desired position.
Removing and installing rear seat head restraints (rear outer seats)
Adjust the head restraint in such a way that it is as close to the head as possible.
The rear center seat head restraint cannot be removed.
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Seats
Warning!
For your protection, drive only with properly positioned head restraints.
Adjust head restraint so that the head restraint supports the back of the head at eye level. This will reduce the potential for injury to the head and neck in the event of an accident or similar situation.
Do not drive the vehicle without the seat head restraints. Head restraints are intended to help reduce injuries during an accident.
Do not interchange head restraints from front and rear seat.
① Release button
Removing rear seat head restraints
▶ Fold back head restraint (▷ page 110).
▶ Pull head restraint to its highest position.
▶ Push release button ① and pull out head restraint.
Installing rear seat head restraints
▶ Insert head restraint and push it down until it engages.
▶ Push button ① and adjust head restraint to desired position.
Lumbar support*
The curvature of the driver's seat can be adjusted to help enhance lower back support and seating comfort.
① Adjustment lever
▶ Move adjustment lever ① in the direction of arrows until you have reached a comfortable seating position.
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Seats
Multicontour seats* (Canada only)
This driver's multicontour seat has a movable seat cushion and inflatable air cushions built into the backrest to provide additional lumbar and side support.
The seat cushion movement, backrest cushion height and curvature can be continuously varied with switches on the side of the seat after switching on ignition.
① Seat cushion depth ② Backrest bottom ③ Backrest center ④ Backrest side bolster adjustment
► Switch on the ignition (▷ page 33).
Seat cushion depth
► Adjust the seat cushion depth to the length of your upper leg using switch ①.
Backrest contour
► Adjust the contour of the backrest to the desired position using switches ② and ③.
Backrest side bolsters
► Adjust the backrest side bolsters so that they provide good lateral support using switch ④.
Seat heating*
The switches for the front seats are located in the center console.
① Seat heating switch ② Indicator lamps
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Seats
The red indicator lamps ② in the switch show the heating level selected.
\begin{tabular}{ll} \textbf{Level} & \ \hline \textbf{3} & Three indicator lamps on \ & (highest level). \ & After approximately 5 minutes, \ & seat heating is automatically \ & switched to level \textbf{2}. \ \textbf{2} & Two indicator lamps on. \ & After approximately 10 minutes, \ & seat heating is automatically \ & switched to level \textbf{1}. \ \textbf{1} & One indicator lamp on (lowest \ & level). \ & After approximately 20 minutes, \ & seat heating is automatically \ & switched off. \ \textbf{off} & No indicator lamp on. \ \end{tabular}
- Switch on the ignition (\triangleright page 33).
Switching on seat heating
- Press switch ① once. Three red indicator lamps ② in the switch come on.
- Continue pressing switch ① until desired seat heating level is reached.
Switching off seat heating
- Press switch ① repeatedly until all indicator lamps ② go out.
i If one or more of the indicator lamps ② on the seat heating switch are flashing, there is insufficient voltage due to too many electrical consumers are turned on. The seat heating switches off automatically.
The seat heating will switch back on again automatically as soon as sufficient voltage is available.
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