Power Door Lock Control Module: Description and Operation
Central Locking Module II (ZVM II):ZV with Decoupling of ZV Motor Drives:
Notes:
- These instructions only apply when a central locking module II (E36 system) is installed in the E34 5 Series as of model year 1992.
- In this system, the ZV motor drive is uncoupled internally from the locking linkage after setting the vehicle in arrest mode.
- 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 II (ZVM II), as well as the closing system have been adopted from the E36 3 Series. They control the following functions:
- Central locking system
- Door lock heating
- Interior lights
The relays for the ZV functions "lock', "unlock" and "arrest" are installed in the central locking module II.
The interior lights are switched via a transistor which is also installed in the module.
The door lock heating system features its own relay outside the module.
Central Locking System:
The following functions are possible:
- Lock/arrest/unlock via door locks of driver's/passenger's door
- Lock/unlock via locking buttons of driver's/passenger's door
- Lock/unlock via rear lid lock
- Release via door locks of driver's/passenger's door
Door Lock of Driver's and Passenger's Door:
The vehicle can be locked, arrested and unlocked/released via the door lock of the driver's and passenger's door.
Following operating steps can be carried out:
"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 inhibited electrically to prevent locking when the driver's door is open (the system unlocks immediately after locking).
Only the passenger's door can be locked when the passenger's door is open, however, the other doors are not locked.
"3" Arrest:
The vehicle is set in arrest mode, the locking buttons are uncoupled from the opening mechanism in the turn-catch lock. The door is not unlocked when the locking buttons are pulled up.
Emergency unlocking:
The driver's and passenger's door can be unlocked mechanically in the event of electrical faults (setting "1"). The uncoupled locking button (after arrest) remain uncoupled also after emergency unlocking.
Rear Lid Lock:
The pin contact in the ZV drive is operated by 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 (9O° to right). The rear lid can then be permanently locked even when the vehicle is unlocked electrically by means of the central locking system (workshop setting).
Tail Gate Lock on "E34 touring":
Lock contacts (microswitches) are operated by means of the tail gate lock of the "E34 touring". The vehicle can be locked, arrested and unlocked/released.
Locking Buttons
The vehicle can be locked and unlocked electrically by means of the locking buttons on the passenger's and driver's door. The locking buttons on the rear door have no influence on the central locking module.
Vehicle in arrest mode:
The locking buttons are uncoupled mechanically from the ZV drives when the vehicle is centrally arrested. This means:
Although the locking button can be pulled up the door is not unlocked. This function is effective on all doors.
Door open:
Driver's door:
If the locking button is pressed down when the driver's door is open, the vehicle is locked electrically and then unlocked automatically. This feature avoids the vehicle being locked unintentionally.
Passenger's door:
If the button is pressed down while the passenger's door is open, only the passenger's door is locked mechanically. Electrical locking of the vehicle does not take place.
Rear doors:
The locking buttons on the rear doors have no influence on the central locking system.
ZV motor drive:
Pin Assignments:
Pin Explanation
1,2,3 Wires to ZV module, electric motor activation
4,5 Wires to ZV module, signalling lock/unlock
6 Wire to fuse, B+ for pin contact
Switching logic:
Pin Unlock Lock Arrest
1 from module B+ from module B- from module B-
2 from module B- from module B- from module B+
3 from module B- from module B+ from module B+
4 B+ open open
5 open B+ B+
6 B+ from fuse B+ from fuse B+ from fuse
Central Locking Functions:
Unlocked status:
The figure shows the ZV motor drive "1" and the corresponding mechanics in the turn-catch lock in unlocked status.
The connecting piece "4" can be turned from the door lock or by the locking button in conjunction with the connecting pieces "5" and "6". When the part "4" is turned it uncouples the door outer handle from the opening mechanism.
Locked status:
Fig. 2: Locked status:
The figure shows the ZV motor drive and the corresponding mechanics in the turn-catch lock when locked.
The part "4" has been turned. Consequently, the slide "3" has been moved. The pin contact "7" is switched. It switches B+ to the ZV module and signals "lock".
Sequence of electrical central locking:
The electric motors "10,, in the ZV motor drives "1" receive their power supply. The spindle nuts "2" in the ZV motor drives are moved by means of a spindle. They are connected to the slide blocks "3" and thus cause the connecting piece "4" to rotate. The motors switch off as soon as the limit switches "9" are reached.
As a result, the outer door handles on all doors are uncoupled from the opening mechanism. A locked door can be unlocked by way of the inner door handle. The handle must be pulled twice for this purpose.
The vehicle can be unlocked once again by pulling up the locking button. Part "4" is turned back by means of parts "5" and "6". The slide block "3', is moved away from the pin contact "7". This signals "unlock" and initiates the power supply to the ZV motors. The part "4" is turned back to the unlock position.
The vehicle can also be unlocked by means of the door lock. In this case, the part "4" is turned from the door lock.
Arrested status:
Fig. 3: Arrested status:
Explanation:
In arrest mode, the locking button is automatically uncoupled from the ZV motor drive.
When the vehicle is arrested, it can only be unlocked via the door locks of the driver's door or passenger's door.
Although the locking buttons can still be pulled up in arrest mode, they do not unlock the doors.
The rear lid can be unlocked also in arrest status however, the doors are not unlocked in this case.
Procedure:
A microswitch is operated by the driver's door lock or passenger's door lock when it is turned to the "arrest position. The ZV module powers the electric motors "10" in the ZV motor drives "1". The spindle nut "2" is moved. It uncouples from the slide blocks "3" and moves the lever "8". This lever uncouples the locking button from the "unlocking mechanism" in the turn-catch lock.
Unlocking is now only possible via the door locks. They are connected to part "4". Part "4" moves back the sliding block "3" when the door lock is turned to the "unlock" position. The slide block "3" is moved away from the pin contact "7". This signals "unlock" and triggers the power supply to the ZV motors. The spindle nuts "2" in all ZV motor drives are moved back to the "unlock" position.
Arrest Vehicle:
General:
The "arrested" status is intended to prevent the vehicle being opened by way of impermissible manipulation.
Since it is not possible to unlock and therefore open the doors from the inside in arrest mode, this function is linked to a series of conditions.
Conditions:
Arresting is only possible when:
- Ignition and terminal R are switched off, i.e. ignition switch in position "0',
- the driver's door was opened at least once alter switching off the ignition,
- the driver's door is closed.
Arrest and release are possible from the driver's and passenger's door.
Crash Sensor:
A crash sensor which connects ground to the module in the case of excessive deceleration (e.g. impact or collision) is connected to the ZV module. When this signal is detected, the module activates all ZV drives and the vehicle is unlocked.
In addition, the interior lights are switched on (only with special option interior light package!) and a ground signal is sent to the crash alarm (not installed in all models, see electrical diagrams). The hazard warning system is switched on by this module.
Initially, the central locking system is inhibited after the crash sensor has triggered. The lockout is canceled by locking and unlocking the vehicle with the locking button or the door lock.
Special Features:
Emergency operation:
If the central locking system fails due to an electrical fault, the driver's and passenger's doors can be unlocked via the door locks even when arrested.
Defect Information:
If one of the following defects occurs:
- Driver's or passenger's door is not locked or unlocked.
- ZV motor drive for driver's or passenger's door faulty,
- Rear lid is not locked,
this is signaled to the operator by the following sequence:
- After locking, the vehicle is automatically unlocked once again. The function is carried out on the second locking attempt.
or
- After unlocking, the vehicle is automatically locked once again. The function is carried out on the second unlocking attempt.
Repeat lockout:
If the central locking system is operated more than 30 times within 2 minutes, the entire system is switched off by a repeat lockout function for approx. 2 minutes. This function prevents overloading of the ZV motor drives.
Coding:
The central locking module II is designed to cope with a large number of equipment variants and different country-specific versions.
If a new control unit is installed, it must either be precoded in accordance with the "central code" or it must be coded in the vehicle.
Coding is performed with the current coding program of the BMW MODiC
Important!
A central locking module must be recoded if taken from a different vehicle!
Coding can be performed as often as necessary.