Power Door Lock Control Module: Description and Operation
Central Locking Module (ZVM):ZV with Blocking of V Motor Drives:
General Block Diagram:
Notes:
These instructions apply only when a central locking module is installed in the 5 Series, E34 up to and Including model year 1991.
In this system, the ZV motor drive is blocked after arresting the vehicle.
If a ZKE general module is installed, perform troubleshooting on the central locking system in accordance with Central Locking System (ZV/ZKE).
Functional Description:
General:
The central locking module (ZVM, installed in rear power distribution box) controls the function sequences for the following systems:
- Central locking system
- Door lock heating
- Interior light control
The relays for lock, unlock and arrest are installed in the central locking module (ZVM). The systems door lock heating (TSH) and interior lights (IB) feature their own relays outside the ZV module.
Components for the central Locking System:
Lock contacts:
Microswitches on door lock of driver's and passenger's door. Depending upon the position of the door lock, they are activated via cams, they switch battery voltage (B+) to the central locking module and signal lock, unlock or arrest.
Pin contacts:
Microswitch in the ZV motor drive (integral component). The pin contacts of the driver's door and passenger's door are activated via the lock buttons, the contact of the rear lid via the rear lid lock.
The contacts switch battery voltage (B+) to the central locking module and signal lock or unlock. Only unlock from the passenger 5 door. The pin contacts indicate the actual status of the doors (locked, unlocked). The rear doors are not equipped with pin contacts.
Central locking module:
Processes the signals from the contacts and switches the ZV motor drives via the three relays.
ZV motor drives:
Electrical serial drives at the door locks. They receive their power supply via the ZV relays in the central locking module. The ZV motor drive is blocked internally in arrest mode.
Central Locking Functions:
The following functions are possible:
- Lock/arrest/unlock via door locks of driver's/passenger's door
- Lock/unlock via locking button of driver's door
- Unlock via locking button of passenger's door
- Lock/unlock via rear lid lock
- Workshop setting of rear lid (= vehicle unlocked, rear lid remains locked)
- Release via door locks of driver's/passenger's door
Door Lock of Driver's and Passenger's Door:
The lock contacts are operated via the door locks of the driver's and passenger's door. The following key positions are possible:
"1" unlock/release:
The vehicle is unlocked and released, if applicable, the antitheft system is disarmed.
"2" Lock:
The vehicle is locked without the arrest function. The locking buttons at the driver's and passenger's door can be pulled up from the inside thus unlocking the vehicle.
The lock system is blocked mechanically to prevent locking when the driver's door is open. Locking can cause synchronization of the door lock, see "5 Synchronization".
"3" Arrest:
The vehicle is arrested, the locking buttons cannot be pulled up.
"4" Emergency unlocking, passenger's door only:
The passenger's door can be opened mechanically in the event of electrical faults. Raise door handle and using car key, turn door lock in unlock direction beyond the hard pressure point (position 4). To lock door, turn to right beyond hard pressure point (position 5).
After normal electrical function has been restored, the ZV drive system must be synchronized (synchronization between linkage and servo drive), see "5 Synchronization".
"5" Synchronization, driver's and passenger's door:
Turn door lock to right beyond hard pressure point (lock). Synchronization is necessary when:
- Vehicle has been locked with driver's door open (= driver's door asynchronous)
- Passenger's door was unlocked in the emergency function (= passenger's door asynchronous)
Rear Lid Lock:
The pin contact in the ZV motor drive is operated via the rear lid lock. The vehicle can be locked and unlocked. If the vehicle is in arrest mode, the rear lid itself can be unlocked but the doors are not unlocked. The key can be removed in the key position locked (900 to right). The rear lid can then be permanently be locked even when the vehicle is unlocked electrically by means of the central locking system (workshop setting).
Locking Buttons:
The pin contacts in the ZV motor drives are operated by the locking buttons. The vehicle can be:
- locked and unlocked via the locking button of the driver's door (driver's door closed!)
- unlocked by the locking button of the passenger's door
Rear doors:
The locking buttons on the rear doors have no influence on the central locking system.
Important!
Driver's door:
The locking linkage of the central locking system is blocked mechanically for as long as the driver's door is open.
Repeat lockout:
To avoid overloading, the central locking system is inhibited when the system is operated very often within a short period of time. The lockout feature is canceled 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, it is not locked - the central locking system (ZV) locks the doors, however, the doors are unlocked again a short time later.
Crash sensor:
(Inertia switch) installation location: Beneath the left rear seat. The crash sensor is effective only 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 to the general module. The vehicle is unlocked/released, the interior lights are switched on (only in switch position automatic interior lights) and the central locking system is disabled.
Canceling the ZV lockout: By turning the door lock in the unlock direction.