Removing and installing/replacing door lock in left or right front door (M4 Coupe, M4 Convertible)

Special tools required: 

• 51 2 190

Necessary preliminary tasks: 

• Remove SOUND INSULATION IN FRONT DOOR .

Disengage Bowden cable (2) from outer door handle at marked position.

Installation note: 

Driver's side only  :

Make sure locking pin (1) is correctly seated in mounting of door lock (3).

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Lever out locking rod (1).

Unfasten plug connection (2) and disconnect.

Release screws (3).

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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).

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Turn door lock (1) as shown and maneuver out below door reinforcement (2).

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Installation note: 

Schematic diagram of removed support for outer door handle.

For it to be possible to install the door lock, locking pin (1) must be in the installation position on the support (2).

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Installation note: 

Install door lock (1) and screw in screws (2) but to not tighten.

Slide special tool 51 2 190 into opened rotary striker until striker engages in first stage

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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)

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Tighten screws of door lock (1).

Observe tightening sequence: bottom - top - inner.

Tightening torque 51 21 1AZ .