GF80.20-P-0005SX Central locking (CL), function

GF80.20-P-0005SX Central Locking (CL), Function

Function
The central locking (CL) controls electric locking and unlocking of the vehicle doors, the trunk lid and the fuel filler flap.

Automatic functions
^ Speed-dependent locking:
- Trunk lid locking (speed above 3 km/h)
- Door locking (speed above 15 km/h)

^ Relocking
^ Emergency opening after an accident

Operation
The following controls are available:
^ Transmitter key (A8/1)
^ Left interior CL [ZV] switch (S85/5)
^ Right interior CL switch (S85/6)
^ Trunk lid open/close switch (S20/1s6) (open trunk lid only, remaining CL remains locked)

On vehicles with code (881) Remote trunk closing (RTC), the trunk lid can be opened and closed hydraulically.For this purpose, see separate function description "Remote trunk closing (RTC) function.

Opening a vehicle door from inside
The vehicle doors can always be opened from the inside regardless of the status of the central locking (CL). The corresponding door lock is then unlocked.

Special case
Globally unlocked vehicle locked with interior actuation CL switch or automatic function
In this case, the vehicle is unlocked globally when the driver or passenger door is opened from inside.

National version (United Kingdom)
If the CL is locked or relocked from the outside, the doors can only be opened from the inside, if the additional door lock was previously deactivated via the menu point "Vehicle" in the COMAND control unit (A40/3).

Child safety lock on rear doors (model 221)
When the mechanical child safety lock in the rear doors is actuated, they cannot be opened from the inside.
This mechanical lockout can be overridden with the safety lever on the rear doors.

National version except (United Kingdom),(Canada) and (United States of America)
As an alternative, the lockout can be released for 5 s by pressing the interior actuation CL switch while actuating the left rear child safety lock motor (A85/3m5) and right rear child safety lock motor (A85/4m5).

Auxiliary door lock (only United Kingdom)

Function requirement
^ Interior protection activated (on vehicles with code (882) Interior monitoring (only with ATA))

Function
When the vehicle is locked with the transmitter key, the mechanical interior actuation is decoupled from all doors, so that it is no longer possible to open the doors from the inside.
The interior protection and the additional door lock are deactivated via the menu point "Vehicle" in the COMAND control unit.

If the vehicle is unlocked from the outside with the transmitter key, the additional door lock is deactivated simultaneously by a command from the EIS control unit (N73). The doors can now be opened again from the inside.

Emergency opening
The emergency opening function unlocks the doors of the vehicle after an accident. The restraint systems control unit (N2/7) transmits the corresponding message to the EIS control unit and the central gateway control unit (N93). After a waiting time of 8 to 11 s, the doors are unlocked.

The emergency opening function overrides all other central locking functions. When the vehicle has been locked from the outside, the emergency opening function is not active.

Trunk lid emergency release (only United States of America)
The trunk lid emergency release switch (S88/10) is located on the inside of the trunk lid and is read in by the rear SAM control unit with fuse and relay module (N10/2). When actuated, the rear SAM control unit actuates the trunk lid CL motor (M14/7) to unlock the trunk lid lock. This function is accomplished regardless of the vehicle speed.