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

GF80.20-P-0005CA Central Locking (CL [ZV]), Function

Central locking (CL [ZV]), general
The CL [ZV] electrically locks and unlocks the vehicle doors, the trunk lid and the fuel filler flap.

The following controls are available:
- Transmitter key (A8/1)
- Trunk lid release button (S15/1)
- Left front door central locking interior switch (S85/5)
- Right front door central locking interior switch (S85/6)
- Trunk lid contact switch (S88/6) (with code (887) Valet Parking)
- Trunk lid emergency opening switch (S88/10) (with code (494) USA version)

The CL [ZV] function comprises the following partial functions:
^ Function sequence for emergency opening in event of crash
^ Function sequence for mechanically locking trunk lid (with code (887) Valet Parking)
^ Function sequence for additional door lock (with code (885) Extended theft protection)
^ Function sequence for play protection

Further subfunctions are described in separate documents:
^ Central locking operation with transmitter key, function
^ Locking/unlocking vehicle with inside switch, function
^ Automatic locking, function

Function sequence for emergency opening in event of crash
The emergency opening function unlocks the doors of the vehicle after an accident. The supplemental restraint system control unit (N2/10) transmits the corresponding message to front SAM control unit with fuse and relay module (N10/1) and electronic ignition lock control unit (N73) via the chassis CAN (CAN E). The electronic ignition lock control unit transmits the message via the interior CAN (CAN B) to the following control units:
- Left front door control unit (N69/1)
- Right front door control unit (N69/2)

After a waiting time of t = 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.

Function sequence for mechanically locking trunk lid (with code (887) Valet Parking)
By turning the lock cylinder on the trunk lid with the emergency key, the trunk lid contact switch is actuated. This signal reads in the rear SAM control unit with fuse and relay module (N10/2) and inhibits the opening request for the trunk lid from the other control points.

Additional function requirement for additional door lock (with code (885) Increased theft protection)
^ Interior protection activated (with code (882) Interior monitoring (only with ATA))
^ Function coded in front SAM control unit
^ All doors closed

Function sequence for additional door lock (with code (885) Extended theft protection)
When locking the CL [ZV], the mechanical interior actuation feature is switched off, so that the doors can no longer be opened from the inside. This prevents breaking in into the vehicle by smashing in a window and opening a door from inside.
Upon locking with the central locking, the electronic ignition lock control unit also sends the command "Additional locking" to the following control units, via the interior CAN:
- Left front door control unit
- Right front door control unit

The following actuator motors are then actuated:
- Left front door additional door lock actuator motor (A85m4) by left front door control unit
- Right front door additional door lock actuator motor (A85/1m4) by right front door control unit

Function sequence for play protection
Each actuation of the CL [ZV] is counted by the electronic ignition switch control unit. The maximum number of actuations is 40. If this value is reached, additional actuation requests are not accomplished for the CL [ZV].
Every t = 7 s one actuation is deducted from the current meter reading.
Actuation of the CL [ZV] again is possible only after dropping below this value again.