Component Tests and General Diagnostics

Central Locking System (ZV/ZKE):

Component Testing:

ZV with Blocking: Test Lock Contacts of Driver's/Passenger's Door:

Test lock contact for lock/arrest:




Resistance measurement at the connector combination of the door lock. Detach plug connection to the wire harness. Measure between Pin 3 (3-pin connector, black) and Pin 2 (2-pin connector yellow). Operate door lock with car key. Resistance < 1 Ohm in lock setting: Lock and arrest. In neutral setting resistance = infinite.

Renew microswitch (lock contact) it detective.

Test lock contact for unlock/arrest:




Resistance measurement at the connector combination of the door lock. Detach plug connection to the wire harness. Measure between Pin 3 (3-pin connector, black) and Pin 1(2-pin connector, yellow). Operate door lock with car key. Resistance < 1 Ohm in lock setting: Unlock and arrest. In neutral setting resistance = infinite.

Renew microswitch (lock contact) if defective.

ZV Motor Drive with Blocking: Test Pin Contacts of ZV Motor Drive, Driver's"passenger's Door:




Block Diagram:

Central locking (ZV) drives for driver's and passenger's door. Locked status.

Pin 3 (lock) at the passenger's door is not connected to the wire harness.
- Chamber 3 in connector X641 is not assigned -.

Test pin contact for unlock:




Measure resistance at ZV motor drive between Pin 6 and Pin 5.

Pull apart ZV motor drive (unlocked position).

Nominal value: Resistance < 1 Ohm.

Renew central locking (ZV) drive if detective.

Test pin contact for lock:



- driver's door only -

Measure resistance at ZV drive motor between Pin 3 and Pin 5.

Push together ZV motor drive (locked position)

Nominal value: Resistance < 1 Ohm.

Renew central locking (ZV) drive if defective.

ZV Motor Drive with Decoupling: Test Pin Contacts of ZV Motor Drives, driver's/Passenger's Door:




Pin Assignments:

Pin Explanation

1,2,3 Wires to relay module, electric motor activation
4,5 Wires to general module, signaling lock/unlock
6 Wires to fuse, B+ for pin contact

Test of pin contact (S1):

Measure at ZV motor drive, connector unplugged.

ZV motor drive in locked status: Measure resistance between Pin 6 and Pin 5

ZV motor drive in unlocked status: Measure resistance between Pin 6 and Pin 4

Nominal value: Resistance < 1 Ohm.

Renew central locking (ZV) drive if defective.

Pin Contact of ZV Motor Drive for Rear Lid:




Block Diagram:

ZV motor drive for rear lid. Unlocked status.

Test pin contact for unlock:




Measure resistance at ZV motor drive between Pin 2 and Pin 3. Push
together ZV motor drive (unlocked position).
Nominal value: Resistance < 1 Ohm.
Renew central locking (ZV) drive it defective.

Measure pin contact for lock:




Measure resistance at ZV drive between Pin 1 and Pin 3. Pull apart ZV
motor drive (locked position).
Nominal value: Resistance < 1 Ohm.
Renew central locking (ZV) drive if detective.