Remove/install front seat backrest frame

AR91.10-P-3331MCC

Remove/install front seat backrest frame

13.7.10

7.5.10

Removal/installation of center armrest mounting added

Operation step 10 and 11



Removing

 Danger!

Risk of injury caused by backrest suddenly folding forward if release lever is accidentally operated during inspection and repair work

When working on the seat, be careful not to accidentally release the backrest mechanism allowing the seat to fold forward. Keep body parts clear of the backrest travel area.

AS91.00-Z-0005-01V

 Danger!

Risk of injury caused by performing testing or repair work on airbag or emergency tensioning retractor units.

Store airbag units with deployment side facing up; do not expose to temperatures greater than 100 °C. When working on these units, disconnect the power supply.

AS91.00-Z-0001-01A

1

Remove seat

AR91.10-P-1000MCC

2

Check routing of wiring harness for seat belt buckle (4)

For driver seat.

 If the wiring harness for the seat belt buckle (4) is routed as shown in picture A, then the seat belt buckle (1) and the backrest frame (2) must be replaced and the wiring harness for the seat belt buckle (4) routed as shown in picture B.

3.1

Remove buckle (1)

For driver seat, when the wiring harness for the seat belt buckle (4) is routed as shown in picture A (early type of fastening for seat belt buckle (1)).

AR91.40-P-1515-01MCC

3.2

Remove bolt (5), place seat belt buckle (1) with wiring harness for seat belt buckle (4) to one side and detach grommet (6) from backrest frame (2)

For driver seat, when the wiring harness for the seat belt buckle (4) is routed as shown in picture B.

4

Remove foam part for backrest

AR91.10-P-1120MCC

5

Fold backrest frame (2) forward

6

Remove bolts (3) of backrest frame (2)

7

Remove backrest frame (2)

8

Remove bolt (5) and remove belt buckle (1)

For driver seat, when the backrest frame (2) is replaced.

9

Remove fuse (9)

When replacing the backrest frame (2).

10

Remove armrest support

For vehicles with code (I50) Armrest or with retrofitted armrest



Install

11

Install support for armrest

For vehicles with code (I50) Armrest or with retrofitted armrest

12

Clip retainer (9) to backrest frame (2)

When replacing the backrest frame (2).

13

Position seat belt buckle (1) onto backrest frame (2) and screw in bolt (5) up to contact surface

When replacing backrest frame (2) on the front passenger seat.

14

Position backrest frame (2) on seat console and screw in bolts (3) up to contact surface

15

Tighten bolts (3) opposite the seat belt buckle (1), starting at the front. Move backrest frame (2) to its rearmost position and lock in place. Tighten bolts (3) in area of seat belt buckle (1), starting from rear. While doing so, press the backrest frame (2) backwards.

 If the wiring harness for the seat belt buckle (4) was routed as shown in picture A, then the bolts (3) in the area of the seat belt buckle (1) need only be screwed in up to the contact surface; they will be tightened at a later stage.



*BA91.10-P-1002-01P

16

Tighten bolt (5) of seat belt buckle (1)

For front passenger seat.



*BA91.40-P-1003-01G

17

Install foam part for backrest

 Before installing the foam part for the backrest, check the installation position (arrows) of the spring frame (7), and correct if necessary.

AR91.10-P-1120MCC

18.1

Insert grommet (6) into backrest frame (2), position seat belt buckle (1) with wiring harness for seat belt buckle (4) on backrest frame (2) and tighten bolt (5).

For driver seat, when the wiring harness for the seat belt buckle (4) was routed as shown in picture B.



*BA91.40-P-1003-01G

18.2

Install belt buckle (1)

For driver seat, when the wiring harness for the seat belt buckle (4) was routed as shown in picture A.

AR91.40-P-1515-02MCC



*BA91.10-P-1002-01P



*BA91.40-P-1003-01G

19

Install seat

AR91.10-P-1000MCC

Number

Designation

Model 451.3/4

BA91.10-P-1002-01P

Bolt of backrest frame to seat frame

Nm

45

Number

Designation

Model 451.3/4

BA91.40-P-1003-01G

Bolt on seat belt buckle

Nm

30