C 350 (204.056) V6-3.5L (272.961) (2008)
Seat Back Frame: All Technical Service Bulletins
Interior - Front Seat Noise When Sitting Down
Seat frame noises
Topic number
LI91.10-P-048506
Version
1
Design group
91.10 Front seats
Date
3-24-2010
Validity
Model series 204
Reason for change
Follow-up operations for cushion shell added / Supersedes DTB S-B-91.10/112f
Reason for block
Complaint:
Noises during relative movement and when somebody sits down.
Cause:
Insufficient grease / play in area of lumbar support frame and/or collision of attachment profile of cushion cover on ring gear of crash lock.
Attachments
Remedy:
For noises coming from area of backrest:
1. Grease wire frame in area of side attachments (see picture DSCN6106 and 6108) with special lubricant
Use damage code 91A41 36/91N41 36.
2. On vehicles with manual lumbar support adjustment, the lumbar support frame can rub against the wire frame due to component movement (see
picture DSCN6117). Eliminate sliding movement with cable ties (see picture DSCN6122 and DSCN6123)
Use damage code 91A41 36/91N41 36.
For noises coming from area of seat adjuster:
1. Check: Check whether the noise only occurs in the lower third of the height adjustment travel and perform a visual inspection of the current condition
(constriction between attachment profile of seat cushion cover and ring gear of crash lock (see picture DSCN6125)
Remedy:
- Adjust height upwards to approx. 40mm from the lowermost position.
- Lower driver seat backrest to the rear.
- Apply a leveraging tool (e.g. large flat tip screwdriver) to the rear on the tunnel side (see picture DSCN6126 and DSCN6127) between the ring gear
and cushion.
- Press the lever towards the inside gently, so that the attachment profile of the seat cover is bent approx. 4mm towards the cushion center.
Important: