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

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Special tools required:

51 2 190

Necessary preliminary tasks:

Close window in front door
Remove function carrier, refer to 51 21 035 REMOVING AND INSTALLING/REPLACING FUNCTION CARRIER ON LEFT OR RIGHT FRONT DOOR

Feed out Bowden cable on carrier.

Fig 1: Feeding Out Bowden Cable On Carrier

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IMPORTANT: Do not damage door lock seal when removing.

Unclip lock knob control rod (1).

Fig 2: Removing Lock

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Release screws (2).

Remove door lock from inside with drive facing forwards (twist out).

IMPORTANT: To avoid leakage and electrical malfunction, pull door lock with special tool 51 2 190 into corner (3), refer to next work step.
Door lock must be at zero current with Soft Close Automatic (risk of damage).

Installation:

Install door lock and insert screws (1), do not tighten down.

Fig 3: Installing Door Lock
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Slide special tool 51 2 190 into opened rotary latch until latch engages in first stage.

Installation:

Pretension door lock (1) with knurled screw (2) until special tool 51 2 190 just contacts corner points (3).

Fig 4: Pretensioning Down Door Lock

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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 be uniformly positioned (water ingress).

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

Note on installation (driver's side only):

Feed paddle (1) into bushing (2) from below.

Fig 5: Feeding Paddle Into Bushing

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Installation:

Bowden cable (1) and fibre optics cable (2) must be routed below bridge (3).

Fig 6: Identifying Bowden Cable And Fibre Optics Cable

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No fibre optics cables are fitted from build date 04/2004.

Installation:

Seal (1) must not be damaged.

Fig 7: Identifying Seal

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