Locks, keys and bolts. Single lock (Mercedes-Benz C-Class W203)

Locks with remote radio control device



The remote control device can unlock the car from a long distance, even out of sight.

To prevent unauthorized persons from entering the vehicle, use the remote control device only from a close distance.

The vehicle comes with two main keys with a remote control. The release buttons (2) are coloured differently for better identification.

Note: Do not expose keys to increased electromagnetic radiation. Malfunctions may occur!

Unlocking car locks

Switching between the "Driver's door unlock" and "Full unlock" settings can be performed.

"Full unlocking" installation

Press the button once, all doors, fuel filler flap and trunk lid are unlocked.

Setting "Unlocking the driver's door"

Button press once, the driver's door and fuel filler flap will unlock.

Button press twice to unlock all doors, fuel filler flap and trunk lid.

Unlocking the vehicle and disabling the anti-theft alarm system (EDW) is confirmed by a single flash of the direction indicator lights.

If after unlocking the vehicle neither the doors nor the trunk lid are opened, the vehicle will automatically lock after approximately 40 seconds.

Locking the car locks

Button press once, all doors, fuel filler flap and trunk lid are locked.

When the doors and tailgate are closed, activation of the vehicle authorisation check system or the operational readiness of the anti-theft warning system (EDW) after locking is confirmed by three flashes of the direction indicator lights.

Battery charge control

Each time the key is used, the battery charge indicator light will briefly light up.

If the control LED does not light, the batteries must be replaced immediately.

Setting up vehicle unlocking functions

Press the buttons simultaneously and and hold them down for about 6 seconds.

The control LED (4) lights up twice.

Switching between the settings "Unlocking the driver's door" and "Full unlocking" is performed.

Replacing the main key power supply elements

Note: Replace batteries in pairs.

Do not dispose of discharged batteries with household waste.

Remove the emergency key.

Press the key into the hole (1), then lift the battery compartment slightly in the direction of the arrow (2) and remove it in the direction of the arrow (3).



Insert the batteries (4) under the contact spring (5) using a lint-free cloth. Plus sign facing up!

Slide the battery compartment into the key housing until it locks into place.

Automatic door locking while driving

At speeds above 15 km/h, the vehicle's main lock is locked.

When one of the front doors is opened from the inside, all vehicle locks are unlocked, provided that the last unlocking of a single vehicle lock was performed by a remote control device.



The automatic locking function of the vehicle's single lock was switched on and off using a remote control device.

The automatic door locking function can be switched on and off in the "VEHICLE" menu (AUTOMOBILE) "Individual installation" systems, in the installation menu "AUTOMATIC DOOR LOCK" (AUTOMATIC DOOR LOCKING). (Refer to the "Custom Installation" Section Multifunctional steering wheel, universal display).

Automatic door unlocking in case of an accident

The doors are unlocked by a collision of precisely defined force.

Single lock switch

The single lock switch is located on the center console.

Press the switch:

• 1 - Locking
• 2 - Unlocking

The vehicle can be unlocked or locked from the inside using the single lock switch. Locking can only be done when the front doors are closed.

If locking was done with a key, then unlocking with a switch is not possible.

Opening or closing the side windows and panoramic sliding roof panel

(summer opening function/comfort closing)

Summer opening function: opens the panoramic sliding roof panel and lowers the side windows.

Comfort closing: closes the panoramic sliding roof panel and raises the side windows.



For safety reasons, the summer opening/comfort closing function can only be activated from a short distance via the infrared function of the remote control. Therefore, point the tip of the key at the driver's door handle.

Summer opening function:

Unlock the vehicle and hold the button down until the side windows and panoramic sliding roof panel reach the desired position.

Interrupting the opening process: Button let go.

Comfortable closing: Lock the car, button keep pressing until all windows and the panoramic sliding roof panel are fully closed.

[Material borrowed from an online resource: MERCEDESMAN.ru]

When leaving the vehicle, check that all side windows are raised and that the panoramic sliding roof panel is closed.

Opening the door

The door can only be opened from the outside if it has been previously unlocked.



The door can be opened from the inside even when the car is locked. When opening the driver's or front passenger's door, both doors are unlocked.

Unlocking of the door is confirmed by pulling out the locking button (3).

Emergency key

The emergency key (2) can be used to unlock and lock the driver's door (emergency door opening) and the driver's door is locked separately (emergency door opening) and the trunk lid is locked or released separately.

Removing the emergency key from the main key: Move the release button (1) in the direction of the arrow and pull out the emergency key (2).

Sliding the emergency key onto the main key: Slide the emergency key (2) until it locks into place.

Emergency unlocking of the driver's door

If the vehicle does not unlock with the remote key control, unlock the driver's door with the emergency key.

Notes for models equipped with anti-theft alarm:

The anti-theft alarm is triggered when the door is opened with the emergency key. The alarm can only be turned off by inserting the key into the ignition switch or pressing the buttons or on the main key.

Emergency release of the trunk lid

The lock cylinder is located in the recess for the rear number plate.

If the trunk door cannot be opened due to a malfunction, then release the trunk door using the emergency key.

Turn the emergency key to position (1) and pull the handle.

Note for models equipped with anti-theft alarm:

The anti-theft alarm is only triggered when the trunk door is opened with the emergency key. The alarm can only be turned off by inserting it into the ignition switch or pressing the buttons or on the main key.

Opening the trunk lid

The handle is located in the recess for the rear license plate.

The trunk lid can be opened manually if the vehicle's main lock has been unlocked beforehand.

To open, pull the handle.

Closing the trunk door

Lower the tailgate by pulling it down using the recess (1) and close it by pressing from above.

Emergency release of the fuel filler flap

Turn the latch on the right side trim and move the side trim to the side.

Pull the release handle (arrow) and at the same time open the fuel filler door from the outside.

Lost key or emergency key

Entrust it to one of the service stations "Mercedes-Benz" block the key and immediately notify the insurance company of the loss of the key.

If the emergency key is lost, the mechanical elements of the locks should be replaced.

A new or emergency key can only be purchased at a service station "Mercedes-Benz".

General notes on the locking system

If the vehicle cannot be unlocked or locked:

• Point the tip of the master key at the driver's door handle.
• Check the charge of the main key batteries (materials at the beginning of the Section).
• Open the car with the emergency key. Insert the key into the ignition and wait until the key in the ignition cannot be turned.