Function notes
Normal operating procedure:
If a command switch is set from unlocked to locked, the locking relay in the central locking control module is actuated, which in turn energizes the actuator motors in parallel and in this way moves the door locks to locked. After completion of the energizing time, the control module initiates the status interrogation of command switches. If all the command switches are in the "locked" position, the operation is completed and the dialog (only on models with radio frequency locking) for "Vehicle locked" is initiated with the radio frequency locking control module.
The procedure for unlocking is the same as for locking with the polarity of the locking relay reversed (pole reversal circuit), although the dialog is established (only on models with radio frequency locking) before the unlocking command is executed.
If an open door of an unlocked vehicle is locked (using the interior handle) and then closed, the entire vehicle is locked.
"Door open" detection:
If an open door is detected by the control module after a locking command has been initiated, the vehicle is locked and then automatically unlocked again. If the vehicle is once again locked within 5 s, a locking-unlocking-locking operation is performed. This serves as a "Door open" message. If, following this, the opened door is closed, it is then automatically locked.
Note
A lockout protection exists only in the case of the driver's door, in other words it is possible in the case of all the other doors to lock the vehicle by operating the interior handle. Ensure that the vehicle key on no account remains in the vehicle.
Asynchronous detection (operational fault):
If one of the actuator motors does not reach the end position after a locking command, this is detected by the control module (command switch not in "locked" position) and the vehicle is then unlocked. If the vehicle is once again locked within 5 s, a locking-unlocking-locking operation is performed. This serves as a fault message.
If the central locking system fails, it is possible to lock or unlock the individual doors with the vehicle key or using the interior handle.