Power Locks: Description and Operation

Central Locking System (ZKE/ZV):

Functional Description:

Block Diagram Central Locking System (ZV):

Image Legend:
No. Abb. Description

1 GM General module
2 PM Relay module
3 TMFT Driver's door module
4 TMBT Passenger's door module
6 Power window switch block
7 Electronic power fuse relay, driver's side K15
K70 Pear lid relay
M12 Driver's door ZV motor drive
M13 Passenger's door ZV motor drive
M16 Fuel tank lid ZV motor drive
M17 Pear lid ZV motor drive
S27 Crash sensor
S47 Driver's door lock switch A, B, BN, C
S49 Passenger's door lock switch A, B, BN, C
S117 Pear lid unlocking button
S118 Glove compartment lock

General:

The central locking system (ZV) is controlled by the general module (GM) of the central body electronics (ZKE II) Central Control Module. The relays for locking, unlocking and arresting the driver's and passenger's door are located in the relay module (RM).

The rear lid is unlocked (opened) via one single relay. This relay is not located in the relay module (RM), however, it is controlled by the relay module (RM).

The system load circuits are fuse-protected by the electronic power fuse ES-relay K15.

Central Locking Functions:

Locking, unlocking: Possible from the door locks of the driver's door and passenger's door (with doors closed). Also by means of the infrared locking system if fitted as an optional extra. From the inside, unlocking and locking are possible by depressing the locking buttons on the doors or by depressing the button on the power window switch block - unarresting is, however, not possible (antitheft).

Rear lid: With the vehicle unlocked, the rear lid is unlocked (opened) by pressing the rear lid button. When the glove compartment is locked, the rear lid can also not be opened even with the vehicle unlocked (detection via micro switch on glove compartment lock).

Locking and unlocking are not possible by way of the rear lid lock. The lock is only provided as an emergency facility for mechanically unlocking the rear lid drive.

Arresting: Arresting is possible from the driver's or passenger's door locks or by way of the infrared locking system. The ZV motor drives are blocked mechanically and can no longer be opened by means of the lock button (antitheft). Arresting is possible only with the ignition off (ignition switch in 0 position), and subsequent opening and closing the driver's door.

Infrared Locking System: Optional Extra:

The same central locking functions as when using the key can be performed with the infrared locking system. The same lockout functions also apply. Two
separate inputs are provided on the general module for the infrared locking system.

Contacts:

Key positions by way of example of driver's door::

Pin contacts: Integrated in the ZV motor drives of the doors are micros- witches which signal the current status (unlocked or locked) to the door modules. The contacts switch battery voltage (U-batt) for the current status (locked, unlocked) to the corresponding door module input.

The pin contacts are operated via the lock button. With the doors closed, the vehicle can be locked and unlocked from both doors via the pin contacts.

Lock contacts: Micro switches are mounted on the door locks which are linked mechanically to the door locks. These switches signal the position of the door lock to the driver's door or passenger's door module. The contacts switch battery voltage (U-batt).

Door contact: Micro switches on cylinder lock. The micro switches switch ground when the passenger's or driver's door is open.

Lock button: Button in power window switch block. The vehicle can be locked and unlocked by pressing this button. The message "button pressed" is sent via the data link FH switch block - general module to the general module.

Special Features:

Function suppression: When the doors are open, the vehicle cannot be locked via the central locking system. The central locking system (ZV) operates as follows:

- When the driver's door is open, central locking is not possible with the key, the button in the power window switch block and the infrared remote control. If the lock button is pressed, the system is unlocked immediately after locking.

- When the passenger's door is open, central locking is not possible by way of the lock button (pin contact).

Note: In the event of failure of the door contact (door is always detected as being open), the driver's door can be locked with the key. The passenger's door can then be locked mechanically.

Repeat lockout: To avoid overloading, the central locking system is inhibited (lockout) when the system is operated more than 32 times within 2 minutes. The lockout feature is cancelled after a defined waiting time.

See: Key positions

Note: The lock button does not move.

Repeat lockout: To avoid overloading, the central locking system is inhibited (lockout) when the system is operated more than 32 times within 2 minutes. The lockout feature is cancelled after a defined waiting time.

Defect information: If a defect occurs in the central locking system (ZV) the driver is made aware of this by the central locking system reverting automatically to its initial status. The required function is performed only after operation for a second time. Example: Vehicle is locked - driver's door defective, is not locked - the central locking system (Z\() locks the doors, the doors are unlocked once again a few seconds later.

CRASH sensor: Installation location: On the A-post driver's side. The CRASH sensor is only effective when the ignition switch is set to R or 15 (Position 1 or 2). At the point of impact, the sensor briefly switches a ground signal (approx. 2 milliseconds) to the input of the general module (GM). The vehicle is unlocked/unarrested, the interior lights are switched on, the hazard warning system is activated and the central locking functions are blocked.Cancelling the ZV lockout: By turning the door lock in the unlock/unarrest direction.

Antitheft system (DWA): The antitheft system (DWA) is armed and unarmed via the central body electronics (ZKE) Central Control Module. The antitheft system is activated only when the corresponding ZV command is given.

The antitheft system (DWA) can therefore not be activated when the central locking system (ZV) is defective.