51 21 090 Removing and installing/replacing door lock in left or right front door

Special tools required:

Necessary preliminary tasks:

Driver's side only:

Unlock and disconnect plug connection (2) at lugs (1).

Unhook Bowden cable (3) from door lock (4).

Unclip lock knob control rod (5).

Fig 1: Disconnecting Plug Connection At Lugs

Courtesy of BMW OF NORTH AMERICA, INC.

Unhook Bowden cable (1) from door lock (2).

IMPORTANT: Bowden cable (1) must:

Fig 2: Unhooking Bowden Cable From Door Lock

Courtesy of BMW OF NORTH AMERICA, INC.

IMPORTANT: Do not damage door lock seal during removal.

Release screws (1).

Remove door lock (2) from inside.

IMPORTANT: To avoid leaking and electrical malfunction:
Pull door lock (2) with special tool into corner (3), see Fig 5 and Fig 6.

Fig 3: Removing Door Lock From Inside

Courtesy of BMW OF NORTH AMERICA, INC.

Installation:

Seal (1) on door lock (2) must not be damaged.

Fig 4: Locating Seal On Door Lock

Courtesy of BMW OF NORTH AMERICA, INC.

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 5: Sliding Special Tool Into Opened Rotary Latch

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 rest uniformly on inner door plate (water ingress).

Tighten down door lock screws. For tightening torque, see 51 21 1AZ in BODY EQUIPMENT - TIGHTENING TORQUES .

Fig 6: Pretensioning Door Lock (1) With Knurled Screw (2) Until Special Tool Just Contacts Corner Points (3)
Courtesy of BMW OF NORTH AMERICA, INC.