GF80.20-P-4009LE Automatic Locking, Function

GF80.20-P-4009LE Automatic Locking, Function

Function requirements, general
^ Central locking (CL) unlocked
^ Automatic locking function activated via COMAND control unit (A40/3)

Automatic locking, general
The vehicle is automatically locked under certain conditions.

The automatic locking function comprises the following partial functions:
^ Function sequence for locking, depending on vehicle speed
^ Function sequence for automatic relocking

Function sequence for locking, depending on vehicle speed
CL activated depending on vehicle speed:
- Vehicle speed above 3 km/h:
- Trunk lid locked

- Vehicle speed above 15 km/h:
- Doors locked

The EIS control unit (N73) recognizes if the limit values are exceeded by evaluating the speed signals from the instrument cluster (A1) and transmits the command "Lock" to the:
- Left door control unit (N69/1) (model 216)
- Left front door control unit (N69/1) (model 221)
- Right door control unit (N69/2) (model 216
- Right front door control unit (N69/2) (model 221)
- Left rear door control unit (N69/3) (model 221)
- Right rear door control unit (N69/4) (model 221)
- Rear SAM control unit with fuse and relay module (N10/2)

The instrument cluster transmits the speed signal to the central gateway control unit (N93) via the central CAN.
The central gateway control unit transmits the signal to the EIS control unit via the interior CAN.

The door control units lock:
- Left door lock unit (A85) (model 216)
- Left front door lock unit (A85) (model 221)
- Right door lock unit (A85/1) (model 216)
- Right front door lock unit (A85/1) (model 221)
- Left rear door lock unit (A85/3) (model 221)
- Right rear door lock unit (A85/4) (model 221)

Moreover, opening of the trunk lid via the trunk lid external operation switch (S88/8) is suppressed by the rear SAM control unit.

The fuel filler flap CL motor (M14/10) is not actuated.

If, after automatic locking, the vehicle is unlocked with the left interior actuation CL switch (S85/5) or right interior actuation CL switch (S85/6) it remains unlocked even at speeds above the corresponding limit value.
The vehicle is returned to the initial state when one of the doors is opened or circuit 15 is switched on and off again.

If a door is opened while driving and then closed again, and the vehicle speed is above the limit for automatic locking, the door is locked again after it is closed.

Function sequence for automatic relocking
After the vehicle is unlocked with the transmitter key (A8/1), a waiting time of 40 s starts. After expiration of this waiting time, the vehicle is locked again, if a door or the trunk lid was not opened previously.
Relock is confirmed by optical feedback

The anti-theft alarm (ATA) (on vehicles with code (551) Antitheft alarm (ATA)) is also activated by the relocking function.