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 DOOR LOCK TENSIONER

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

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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: Releasing Cable Holder 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:

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

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

Fig 3: Identifying Door Lock With Special Tool

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Installation:

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

Fig 4: Locating 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: If necessary, retrofit cover (1) on door lock (2).

Fig 5: Identifying Door Lock & Cover

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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: Installing Door Lock & 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:

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 plate (water ingress).

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

Fig 7: Identifying Door Lock Seal On Inner Door Plate
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