DESCRIPTION & OPERATION
The central locking system controls locking and unlocking all doors, fuel tank lid and trunk lid/tailgate. It also controls door lock heater, and is the power source for power windows and sun roof. In the event of a crash, the central locking system control module will turn interior lights on, turn hazard flashers on, high beams will flash (some models) and doors will unlock.
On some models, central locking system is integrated with alarm system and is controlled by alarm system remote control unit. Central locking control module is located under right rear seat or behind glove box.
DOORS
By using key in driver's door lock, central locking system can be actuated to lock or unlock all doors and trunk lid. Control unit is located behind glove box or under rear seat. Control module is controlled from a switch in driver's door, passenger's front door (some models), front door interior lock knobs and trunk lid (some models).
Inserting key in driver's door can lock, unlock or arrest mode all doors and trunk lid. (Scheme 1) In arrest mode, system mechanically disconnects linkage from door lock. When system is in arrest mode, inside door lock button can be pulled up, but doors will still be locked.
Scheme 1
Inserting key in passenger's front door can lock all doors, but not operate arrest mode. If arrest mode is on, rotating key counterclockwise in passenger's front door will release arrest mode and unlock all doors. With all doors closed, raising or lowering either front inside door button will lock or unlock all doors. If the driver's door is open, pressing driver's inside door button down will mechanically lock driver's door only.
TRUNK LID
Trunk lid lock can be operated by driver's door lock switch or trunk lid lock. All doors can be locked or unlocked from trunk lid lock. If arrest mode is on, only the trunk lid may be unlocked with the key (all doors will remain locked). If the key is turned 90° clockwise and removed, the trunk lid will remain locked. While in this mode, the power door system will not unlock the trunk lid. To unlock trunk lid, insert key and turn counterclockwise to unlock position.
DOOR LOCK DRIVER
Front door lock driver contains a motor, levers and shafts which connect to door locking mechanism and 2 switches. Rear door lock driver is the same except for having one switch. In the unlocked position, the door lock motor moves a connecting piece between internal door linkage. This allows the door to be locked or unlocked manually.
In the locked position, the control module signals the motor to drive spindle nut until limit switch turns motor off. In this position, lever piece connecting door lock with outer handle disengages. The inner handle may still unlock the door by pulling handle up two times. If the inside door button is raised, this causes connecting piece to rotate lever and slide piece. When this happens, slide block comes off position switch and control module is signaled to unlock all doors.
In the arrest mode, the door lock driver is mechanically disconnected from inside door lock mechanism. The door key must be used to rotate lever piece that moves sliding block back to unlock position. This signals control module to unlock all other doors, trunk lid/tailgate and fuel tank lid.
TROUBLE SHOOTING
Note. Testing of power door lock system is accomplished using BMW Service Tester (Sun 2013 Engine Analyzer) and applicable BMW diagnostic software. Tester permits technician to access trouble codes, activate components and monitor systems.
REMOVAL & INSTALLATION
| CAUTION | When battery is disconnected, vehicle computer and memory systems may lose memory data. Driveability problems may exist until computer systems have completed a relearn cycle. |
Removal & Installation (3-Series)
Control unit for central locking system is located on kick panel behind glove box. Remove glove box. Remove control module from mounting bracket. Disconnect electrical connector. To install, reverse removal procedure.
Removal & Installation (5-Series & 7-Series)
Control module for central locking system is located under rear seat. Remove rear seat. Locate control module near battery, and remove from mounting bracket. Disconnect electrical connector. To install, reverse removal procedure.
Removal & Installation (3-Series & 5-Series)
- Close window and remove wiring from window motor. Using Pliers (61-1-300), pull off mirror control knob. Remove mirror switch. Remove panel screw under mirror switch. Remove door release handle cover and mounting screw.
- Remove inside door lock button. Remove window handle and loosen door trim panel. Unhook release cable from door mechanism. Remove door trim panel. Squeeze hook and pull clamp from center of door panel.
- Pull retainer back and lift out plug. Remove screws and pull drive motor assembly from door lock handle assembly.
- Remove cover from rear of door (near weatherstrip). Hold outside handle plate (surrounding door handle). Using a small metal rod, push retainer forward through hole in rear of door.
- Remove retainer and disconnect linkage. Using Spanner (51-2-070), remove nut holding key cylinder. Remove front screw and wiring. Remove door handle assembly from door.
- To install door handle, use Hook (51-3-140) to pull door handle retainer into position. To complete installation, reverse removal procedure. On 5-Series, adjust door lock.
Removal & Installation (7-Series & 8-Series)
Information is not available from manufacturer at time of publication.
WIRING DIAGRAMS
Note. Wiring diagrams for BMW 5, 7 and 8-series vehicles are not available from manufacturer at time of publication.
