Removing and Installing/Replacing Backrest Frame on Front Left or Right Seat (Normal/Electric)

52 14 030 Removing And Installing/Replacing Backrest Frame On Front Left Or Right Seat (Normal/Electric)

Necessary preliminary tasks:
- Remove backrest cover with padding
- If necessary, remove lumbar cushion and valve housing/drive unit on front seat
- Remove seatback release
- Remove microswitch.
- Remove coupling gear







Disconnect plug connection (1).
Unclip seat wiring harness (2) and remove.







NOTE:
Before removing the backrest, it is essential to move the backrest forwards:
- Pull Bowden cable (1) and press backrest forwards.







Tunnel side:
Release screw (1).

Installation:
Screw (1) must be replaced.
14AZ Backrest frame to seat frame - Screw 24(+4) Nm
Note: Replace screws







Door side:
Release nut on opposite side from stud (1).
Drive out stud (1) with plastic mallet.

Installation:
Stud (1) and nut must be replaced.
15AZ Backrest frame to seat frame - Pin with knurling and lock nut 40(+5) Nm
Note: Replace screws







Remove backrest frame from seat mechanism as follows:
Lever tunnel-side backrest frame with screwdriver over bushing.
Then remove backrest frame in upward direction by pulling with alternate movements.
Tunnel-side plastic bushing (1) must not be damaged.







Backrest mounting on door side:
1. Install door-side backrest link (1).
2. Backrest link (1) must be joined centrally on blocking cam (2).
3. Connect stud and tighten nut hand-tight.







Backrest mounting on tunnel side:
1. Install tunnel-side backrest strut.

IMPORTANT: Plastic bushing must not be damaged

2. Tighten screw hand-tight.

NOTE: Tighten down stud and screw only after mounting backrest on both sides.

Tightening torque:
- Stud on door side:
15AZ Backrest frame to seat frame - Pin with knurling and lock nut 40(+5) Nm
Note: Replace screws
- Screw on tunnel side:
14AZ Backrest frame to seat frame - Screw 24(+4) Nm
Note: Replace screws

If necessary, remove inertia reel unit.