Rear Door Latch: Service and Repair

51 22 090 Removing And Installing/Renewing Door Lock In Left Or Right Rear Door

Special tools required:







Necessary preliminary tasks:
- Remove sound insulation
- E70 Security: Slacken screws for protective mat







Installation:
Check function of child safety catch, as problems may arise:
- Lock does not centre in body aperture
- Lock scrapes on inner door panel
- Lock snags on inner door panel







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

Installation:
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: Door can not be opened if Bowden cable (1) is incorrectly laid.







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 screws (2).







IMPORTANT: Do not damage door lock seal during removal.

Release screws (1).
Remove door lock (2) from inside and carefully feed out.

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 (3) must not be damaged.
Adapter switching socket (4) must be correctly engaged.
Door wiring harness must be correctly laid in guide (3).







Installation:

Version with Soft Close Automatic:
Make sure Soft Close Automatic 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:
- 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:
- Pretension 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 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 22 1AZ.







Installation:
Carry out function check of child lock (1) and door lock (2) with door opened.