Rear Door Latch: Service and Repair

51 22 090 - Removing and installing/replacing door lock in left or right rear door





Special tools required:
- 51 2 190 51 2 190 Door Lock Tensioner





Necessary preliminary tasks:
- Remove sound insulation Removing and Installing/Replacing Sound Insulation on Left or Right Rear Door in rear area only
- If necessary, remove crashpad





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

Important!
Bowden cable must be correctly located in mounts on door lock (2).
Seal (4) must be correctly positioned on Bowden cable.

Note:
The operations for "Removing Bowden cable from door lock" end here.





Unlock plug connection (1) at lugs (2) and detach from door lock (3).
Unclip locking rod (4) from door lock (3).





Version with Soft Close Automatic:
Disconnect plug connection (1).
Unfasten cable tie (2).
Release screw (3) and nuts (4).
Tightening torque 51 22 10AZ 51 22 Rear Door Locks.





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 into corner (3), see Figs. R51 3381 and R51 7594.





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





Installation:
- Install door lock and insert screws (1), do not tighten down.
- Slide special tool 51 2 190 51 2 190 Door Lock Tensioner 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 51 2 190 Door Lock Tensioner just contacts corner points (3).

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 51 22 Rear Door Locks.





Installation:
Check function of child lock (1) on door lock (2).





Replacement with Soft Close Automatic:
Release nuts (1) and remove bracket (2).
Tightening torque 51 22 11AZ 51 22 Rear Door Locks.