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. See 51 48 060 REMOVING AND INSTALLING/REPLACING SOUND INSULATION IN LEFT OR RIGHT FRONT DOOR .

Overview: 

1. Wiring harness attachment points
2. Bowden cable between door lock and carrier plate for outside door handle
3. Door lock
4. 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: Removing Bowden Cable

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Unclip locking rod (1).

Fig 3: Removing Lock 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 Lock 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: Removing Door Lock

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Installation note: 

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

Fig 7: Locating Seal On Door Lock

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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 Drive, Control Line And Guides

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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: Identifying Special Tool 51 2 190

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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: Tightening Knurled Screw

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Tighten screws of door lock

Observe tightening sequence: bottom - top - inner.

Tightening torque 51 21 1AZ .