Replacing Backrest Frame (Air-Conditioned Comfort Seat)

Replacing Backrest Frame (Air-Conditioned Comfort Seat)

Technical values







Preliminary work

1. Remove motor for lumbar support. Refer to Removing and installing lumbar support motor.
2. Remove control valve for lumbar support adjustment. Refer to Removing and installing control valve for lumbar support adjustment.
3. Remove lumbar support. Refer to Removing and installing lumbar support.
4. Remove motor for backrest adjustment. Refer to Removing and installing motor for backrest adjustment.
5. Remove bowden cable for backrest release. Refer to Removing and installing bowden cable for backrest release.
6. Loosen wire harness for backrest close to the backrest frame. Refer to Removing and installing wire harness for backrest (front seat).

Disassembling backrest frame

Removing inner spring on backrest frame

1. Disengage tension springs -1- at left and right on inner spring -2- ( -arrows A- ).







2. Unclip inner spring -2- on backrest frame at the drive shaft -arrow B- and remove inner spring.
3. Disengage tension springs -1- on the backrest frame.

Removing frame for side airbag

1. Unscrew fastening screws -1- and unclip frame for side airbag -2- from the backrest frame -3-.







Disassembling backrest frame

1. Remove fastening nuts -1- from the backrest frame -2-, check them and replace if necessary.







2. Unclip fixing clips -1- from the backrest frame -2-, check them and replace if necessary.







Removing backrest frame

INFORMATION: Two persons are needed to remove and install the backrest frame.

1. Hold backrest frame -3- upright.







2. Unscrew fastening screws -1- at the left and right and remove support panel -2- ( -arrow A- ).
3. Lift backrest frame -3- up out of the seat frame -arrow B-.

Assembling backrest frame

Installing backrest frame

INFORMATION: Two persons are needed to remove and install the backrest frame.

1. Guide backrest frame -3- into the seat frame -arrow A-.







DANGER: Loosen the safety screws.
- Danger of injury if front seat is not screwed down correctly.
- Always replace fastening screws for the front seat after customer service and reworking.
- It is not permissible to make alterations to the micro-encapsulated screws (e.g., use lubricant, loosen bolts, and screw them down again).

2. Position support panel -2- on the seat frame -arrow B- and secure with the fastening screws -1-. Tightening torque: 34 Nm (25 ftlb.)±4 Nm (±3 ftlb.)

Assembling backrest frame

1. Press in fixing clips -1- on the backrest frame -2-.







2. Screw fastening nuts -1- onto the backrest frame -2-.







Installing frame for side airbag

1. Clip frame for side airbag -2- to backrest frame -3- and secure with the fastening screws -1-.







Installing inner spring on backrest frame

1. Engage tension springs -1- in the backrest frame.







2. Clip in inner spring -2- on lower part of backrest frame at the drive shaft -arrow A-.
3. Engage tension springs -1- in the inner spring -2- on the backrest frame -arrow B-.

Subsequent work

1. Secure wire harness for backrest close to the backrest frame. Refer to Removing and installing wire harness for backrest (front seat).
2. Install bowden cable for backrest release. Refer to Removing and installing bowden cable for backrest release.
3. Install motor for backrest adjustment. Refer to Removing and installing motor for backrest adjustment.
4. Install lumbar support. Refer to Removing and installing lumbar support.
5. Install control valve for lumbar support adjustment. Refer to Removing and installing control valve for lumbar support adjustment.
6. Install motor for lumbar support. Refer to Removing and installing lumbar support motor.