Automatic locking, function - GF80.20-P-4009SX
MODEL 221.0 /1, 216.3 up to Model Year 8
Speed-dependent locking
Function requirements
- Central locking (CL) unlocked
- Automatic locking function activated via COMAND control unit (A40/3)
Function
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) on model 216 or Left front door control unit (N69/1) on model 221
- Right door control unit (N69/2) on model 216 or Right front door control unit (N69/2) on model 221
- Left rear door control unit (N69/3) on model 221
- Right rear door control unit (N69/4) on model 221
- Rear SAM control unit with fuse and relay module (N10/2)
They then cause the following to be locked:
- Left door lock unit (A85) on model 216 or Left front door lock unit (A85) on model 221
- Right door lock unit (A85/1) on model 216 or Right front door lock unit (A85/1) on model 221
- Left rear door lock unit (A85/3) on model 221
- Right rear door lock unit (A85/4) on 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 CL switch (S85/5) or right interior CL switch (S85/6), it remains unlocked even at speed 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.
Automatic relocking function
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) Anti-theft alarm (ATA)) is also activated by the relocking function.
| Rear SAM control unit with fuse and relay module, component description | N10/2 | GF54.21-P-6030SX | |
| Driver-side front door control unit, component description | N69/1 Model 221 |
GF72.29-P-6000SX | |
| Model 216 | GF72.29-P-6000SC | ||
| Passenger-side front door control unit, component description | N69/2 Model 221 |
GF72.29-P-6010SX | |
| Model 216 | GF72.29-P-6010SC | ||
| Rear door control unit component description | N69/3, N69/4 Model 221 |
GF72.29-P-6020SX | |
| Electronic ignition/starter switch control unit (EIS) component description | N73 | GF80.57-P-6000SX |