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 work:

Remove rear section of POWER WINDOW REGULATOR

Driver's side only:

Remove LOCK BARREL

Unclip locking rod (1).

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

Fig 1: Identifying Plug Connection, Locking Rod And Tabs

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

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

Installation note:

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: Removing Cable Clip On Door Lock

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IMPORTANT: Do not damage door lock seal when removing.

Release screws (1).

Remove door lock (2) from inside.

Installation note:

Pull door lock (2) with special tool into corner (3).

Fig 3: Pulling Door Lock With Special Tool Into Corner

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IMPORTANT: Observe the following notes on installation without fail in order to avoid leakage and electrical malfunction.

Installation note:

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

Fig 4: Locating Gasket 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 barrels:

If necessary, retrofit cover (1) on door lock (2).

Fig 5: Identifying Retrofit Cover On Door Lock

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Installation note:

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

Fig 6: Sliding Special Tool 51 2 190 Into Opened Rotary Striker
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Installation note:

Pre-tension door lock (1) with knurled screw (2) until special tool 51 2 190 just contacts corner points (3)

IMPORTANT: Risk of damage!
To tension door lock (1), it is only permitted to turn knurled screw (2) by a further 1 to 1.5 turns (max.).
Door lock seal must rest uniformly on inner door panel (water ingress).

Tighten down door lock screws, tightening torque 51 21 1AZ .

Fig 7: Pretensioning Door Lock With Knurled Screw Using Special Tool 51 2 190
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