The central locking actuator on the front door is integrated into the lock. If it is defective, for example, leaks, the door lock must be replaced together with the actuator.
1. Remove door lock 1, see relevant chapter, and check the function of the actuator 2 (see illustration).
To do this, connect a conventional vacuum pump to port 3 instead of the low-pressure hose.
2. Replace the door lock, see relevant chapter.