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

WARNING: This page does not describe the selected car, but rather 21 other vehicles, including the 2017 BMW 550i GT xDrive, 2017 BMW 535i GT xDrive, 2017 BMW 535i GT, 2016 BMW 550i GT xDrive, and 2016 BMW 535i GT xDrive. However, it is still accessible from the selected car via links, so may be relevant.

Special tools required:

51 2 190

Necessary preliminary tasks:

Remove SOUND INSULATION

Version with Soft Close Automatic:

Partially remove POWER WINDOW REGULATOR

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 1: Detaching Bowden Cable

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Unclip locking rod (1).

Fig 2: Identifying Locking Rod

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Version with Soft Close Automatic:

Unfasten plug connection (1) and disconnect.

Unfasten screws (2).

Tightening torque 51 21 6AZ .

Unscrew nut (3).

Tightening torque 51 21 6AZ .

Fig 3: Identifying Plug Connection, Screws And Nut

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IMPORTANT: Do not damage door lock seal when removing.

Release screws (1).

Tightening torque 51 21 1AZ .

Fig 4: Identifying Screws And Door Lock At Locking Pin

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Driver's door only:

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

Installation note:

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

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

Fig 5: Identifying Door Lock And Locking Pin

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Installation note:

Gasket (1) on door lock (3) must not be damaged.

Fig 6: Locating Gasket 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 routed.

Fig 7: Identifying 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 8: Installing Door Lock Screws
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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: 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 .

Fig 9: Tightening Knurled Screw

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