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

Special tools required:

Necessary preliminary tasks:

Driver's side only:

Unlock and disconnect plug connection (2) at lugs (1).

Unhook Bowden cable (3) from door lock (4).

Unclip lock knob control rod (5).

Fig 1: Identifying Bowden Cable From Door Lock

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Unhook Bowden cable (1) from door lock (2).

IMPORTANT: Bowden cable (1) must:

Fig 2: Identifying Mountings On Door Lock

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IMPORTANT: Do not damage door lock seal during removal.

Release screws (1).

Remove door lock (2) from inside.

IMPORTANT:

To avoid leaking and electrical malfunction:

Pull door lock (2) with special tool in to corner (3), see Fig 5 and Fig 6 .

Fig 3: Removing Door Lock From Inside

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Installation:

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

Fig 4: Identifying Seal On Door Lock

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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. (See BODY EQUIPMENT - SPECIAL TOOLS article)

Fig 5: Identifying Special Tool (51 2 190)

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Installation:

Pretension door lock (1) with knurled screw (2) until special tool 51 2 190 just contacts corner points (3). (See BODY EQUIPMENT - SPECIAL TOOLS article)

IMPORTANT:

To tension door lock (1), it is only permitted to turn knurled screw (2) by a further 1 to 1.5 turns (max.) (risk of damage).

Door lock seal must rest uniformly on inner door plate (water ingress).

Tighten down door lock screws, tightening torque 51 21 1AZ. (See BODY EQUIPMENT - TIGHTENING TORQUES article)

Fig 6: Identifying Special Tool (51 2 190)

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