Front Door Latch: Service and Repair

51 21 090 Removing And Installing/Replacing Door Lock In Left Or Right Front Door

Special tools required:







Necessary preliminary work:
- Partially remove soundproofing







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







NOTE: Graphic is similar.

Disconnect Bowden cable at bottom (1) and top (3) from door lock (2).

Installation note:
Bowden cable must be correctly engaged in locators in door lock (2).
Bowden cable must be laid without kinks in bend to door lock (2).
Seal (4) must be correctly fitted on Bowden cable.

IMPORTANT: If Bowden cable (1) is routed incorrectly, door can not be opened from the outside.







Unclip locking rod (1).







Version with Automatic Soft Close system:
Disconnect plug connection (1).
Unfasten screws (2).
Tightening torque 51 21 6AZ.







Release screws (1).







Only with driver's door:
- Disengage door lock (1) at locking pin (2).

Installation note:
Make sure locking pin (2) is correctly seated in locator (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.

IMPORTANT: Do not damage door lock seal on removal.







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







Installation note:
Version with Automatic Soft Close system:

Make sure Automatic Soft Close system 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).







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







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 down door lock screws, tightening torque 51 21 1AZ.