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

WARNING: This page is about a different variant/trim than selected.

Special tools required:

51 2 190

Necessary preliminary tasks:

Remove rear section of Power Window Unit

Driver's side only:

Remove Lock Cylinder Lock Cylinder

Unclip lock knob control rod (1).

Unlock and disconnect plug connection (2) at lugs (3).

Fig 1: Identifying Lock Knob Control Rod, Plug Connection And Lugs

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

If necessary, release cable holder on door lock (2).

Installation:

Bowden cable (1) must be correctly engaged in locators in door lock (2).

Bowden cable (1) must be laid without kinks in bend to door lock (2).

IMPORTANT: Door cannot be opened if Bowden cable (1) is incorrectly laid.

Fig 2: Identifying Bowden Cable And Door Lock

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IMPORTANT: Do not damage door lock seal when removing.

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), refer to illustrations Fig 6 and Fig 7.

Fig 3: Identifying Door Lock, Corner And Screws

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Installation:

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

Fig 4: Locating Seal On Door Lock

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E90/E91 driver's side only:

NOTE: Cover (1) protects against water ingress.

In event of problems with frozen door locks/lock cylinders, retrofit cover (1) on door lock (2) if necessary.

Fig 5: Identifying Cover And Door Lock

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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 6: Identifying Special Tool (51 2 190) And Screws
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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).

Fig 7: Identifying Door Lock, Knurled Screw, Contact Corner Points And Special Tool (51 2 190)

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Tighten down door lock screws, for tightening torque refer to 51 21 1AZ in 51 21 FRONT DOOR LOCKS .