51 21 090 Removing And Installing/Replacing Door Lock In Left Or Right Front Door

WARNING: This page is about a different car, the 2008 BMW Alpina and 2007 BMW Alpina. However, it is still accessible from the selected car via links, so may be relevant.

Special tools required:

51 2 190

Necessary preliminary tasks:

Close window in front door
Remove function carrier . See 51 21 035 REMOVING AND INSTALLING/REPLACING FUNCTION CARRIER ON LEFT OR RIGHT FRONT DOOR .

Feed out Bowden cable on carrier.

Pull out Bowden cable towards bottom.
Pull out cable at side.
Clip (Bowden cable with blue sealing cap only)

Fig 1: Pulling Out Bowden Cable
Courtesy of BMW OF NORTH AMERICA, INC.

IMPORTANT: Do not damage door lock seal when removing.

Unclip lock knob control rod (1).

Release screws (2).

Remove door lock from inside with drive facing forwards (twist out).

Fig 2: Identifying Lock Knob Control Rod And Screw

Courtesy of BMW OF NORTH AMERICA, INC.

IMPORTANT: To avoid leakage and electrical malfunction, pull door lock with special tool 51 2 190 into corner (3), refer to next step.
Door lock must be at zero current with Soft Close Automatic (risk of damage).

Installation:

Install door lock and insert screws (1), do not tighten down.
Slide special tool 51 2 190 into opened rotary latch until latch engages in first stage.

Fig 3: Identifying Special Tool (51 2 190)
Courtesy of BMW OF NORTH AMERICA, INC.

Installation:

Pretension door lock (1) with knurled screw (2) until special tool 51 2 190 just contacts corner points (3).

IMPORTANT: To tension door lock (1), it is only permitted to turn knurled screw (2) by a further 1 to 1.5 turns (max.) (risk of damage).
Door lock seal must be uniformly positioned (water ingress).

Fig 4: Identifying Special Tool (51 2 190)