General description

GENERAL DESCRIPTION

The door locking system comprises an electronic control unit which controls and commands the door locks; each lock comprises a gear motor for locking/releasing the door lock, a control switch (connected to the electric circuit only for the front doors) and a switch signalling that the doors are open. The latter is used by the Check Panel (see "Doors open signalling") and by the anti-theft device (see "Antitheft device").

The gear motors are operated simultaneously by acting on one of the control switches of the front door either from inside through the knobs or from the outside using the key. Due to safety reasons the devices for the rear doors are mechanical only (they work closing the door concerned) and do not operate as an electric lock/release command.

NOTE: the control unit logic comprises a series of check and security operations:

• if the power supply is cut off, the locked doors are not released and they will only open when the supply has been restored;
• during release, if one of the control switches is mechanically impeded, release is cut off;
• if a failure causes the supply to the motors to last for over 4 seconds, this supply is cut off (only version for fusebox "A" and "C");
• if several opening/closing commands are received by the control unit from the key, only the last one to be sent will be considered;

• in the event of contrary commands (e.g. one with the key and one with the inside knob) the control unit will oscillate: oscillation ends after 8 consecutive commands (only for version for fusebox "A" and "C").

N.B.: in the versions with anti-theft device the door locking device is also operated via the remote control which works in the same way as manual locking/releasing. For further details see "Anti-theft device".

FUNCTIONAL DESCRIPTION

The door lock control unit N11 is located in fusebox G1 (fusebox "A" and "C") or on the bracket next to the fusebox (fusebox "B").

It is supplied by the battery voltage (pin +) through fuse F18 (fusebox "A" and "C") or by fuse F16 (fusebox "B"), while it is connected to earth (pin -).

It receives an earth signal at pins 2 and 3 which represents the locking or release command leading from the control switches of the right front lock P10 and the left one P11:

• locking signal: if the earth passes from pin 2 to pin 3;
• releasing signal: viceversa from pin 3 to pin 2.

The logic of the control unit N11 carries out the checks mentioned previously and sends the locking signal (pin 2M: 12V and pin 1M: earth) or releasing signal (pin 1M: 12V and pin 2M: earth) simultaneously to the door lock gear motors P10, P11, P12 and P13.