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

Special tools required:

51 2 190

Necessary preliminary tasks:

Remove SOUND INSULATION in rear section

Overview:

Wiring harness attachment points
Bowden cable between door lock and carrier plate for outside door handle
Door lock
Carrier plate for outside door handle

Fig 1: Identifying Wiring Harness Attachment Points, Bowden Cable, Door Lock And Carrier Plate

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Detach Bowden cable (1) at bottom (A) and top (B) from door lock (3).

Installation note:

Sealing (2) must be correctly fitted on Bowden cable (1).

Bowden cable (1) must be correctly engaged in fixtures (A and B) on door lock (3).

Make sure Bowden cable (1) is in correct position!

An incorrectly routed Bowden cable can cause door locking system malfunctions.

Fig 2: Detaching Bowden Cable From Door Lock

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Unclip locking rod (1).

Fig 3: Identifying Locking Rod

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Version with Soft Close Automatic:

Disconnect plug connection (1).

Unfasten screws (2).

Tightening torque 51 21 6AZ .

Fig 4: Identifying Plug Connection And Screws

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Release screws (1).

Fig 5: Identifying Door Locks Screws

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Only with driver's door:

Disengage door lock (1) at locking pin (2).

Installation note:

Make sure locking pin (2) is correctly seated in mount (3).

Separate all connectors at door lock (1).

Feed out wiring harness on door lock (1).

Remove door lock (1) if necessary with Soft Close Automatic.

Fig 6: Identifying Door Lock And Locking Pin

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IMPORTANT: Do not damage door lock seal on removal.

Installation note:

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

Fig 7: Locating Door Lock Seal

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Installation note:

Version with Soft Close Automatic:

Make sure Automatic Soft Close drive (1) is installed in correct installation position. Control line (3) must not be twisted around Bowden cable (2).

Make sure control line (3) is correctly laid in guides (4).

Fig 8: Identifying Automatic Soft Close System Drive, Bowden Cable And Control Line

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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 9: 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)

Fig 10: Identifying Tension Door Lock With Knurled Screw

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

Tighten screws of door lock

Observe tightening sequence: bottom - top - inner.

Tightening torque 51 21 1AZ .