Central Locking Inoperable on One Door

F1: Checking Mechanical Operation Of Faulty Door Unit.

Switch off Ignition.





Close door.
Check if door can be locked and unlocked with interior locking button.
Then open with inside handle.





If central locking unit can be operated mechanically:
Check central locking motor winding as per C14.


If central locking unit CANNOT be operated mechanically:

Car without deadlock:
Mechanical fault in central locking unit or linkage with inside lock and door opener. Correct fault or replace complete central locking unit or linkage.


Car with deadlock
If the front door central locking unit is faulty:
Check if the front door central locking motor can be released from the deadlock position F2.

It the rear door central locking unit is faulty:
Check if the rear door central locking motor can be released from the deadlock position F3.



F2: Check If Front Door Central Locking Motor Can Be Released From Deadlock Setting.

Switch ignition off.





Remove necessary front door panels.
Open central locking unit's 14-pin connector.
Connect ground to terminal 8 in wiring harness 14-pin connector and then battery voltage to terminal 10 in wiring harness 14-pin connector for approx. 2 seconds.





Central locking unit should be released from deadlock selling. Open door with the inside lock button or inside handle.

If door is released from deadlock selling:
Open-circuit or short circuit between terminal 8 in wiring harness 14-pin connector and terminal MBL (left front door) or MBH (right front door) at deadlock relay base, or terminal 10 in wiring harness 14-pin connector and terminal 88 at central locking relay base.

Correct fault or replace lead between terminal 8 in wiring harness 14-pin connector and terminal MBL (left front door) or MBH (right front door) at deadlock relay base or terminal 10 in wiring harness 14-pin connector and terminal 88 at central locking relay base.


If door is not released from deadlock selling:
Fault in central locking motor or its leads. Correct fault or replace central locking motor it lock unit is faulty.


F3: Check If Rear Door Central Locking Motor Can Be Released From Deadlock Setting.

Switch off ignition.





Open central locking system 11-pin connector in B- post.
Connect ground to terminal 6 in wiring harness 11-pin connector and then battery voltage to terminal 8 in wiring harness 11-pin connector for approx. 2 seconds.





The central lock should be released from the deadlock setting. Open the door with the Inside lock button or inside door handle.

If door Is released from deadlock Setting:
Open-circuit or short-circuit between position 6 in wiring hamess 11-pin connector and terminal MBL (left rear door) or MBH (right rear door) at deadlock relay base, or terminal 8 In wiring harness 11-pin connector and terminal 88 at central locking relay base. Correct fault or replace lead between terminal 6 in wiring harness 11-pin connector and terminal MBL (left rear door) or MBH (right rear door) at deadlock relay base, or terminal 8 in wiring harness 11-pin connector and terminal 88 at central locking relay base.

If door Is not released from deadlock setting:
Fault in central locking motor or its leads.
Correct fault or replace central locking motor if lock unit is faulty.