C 230 CL (203.740) L4-1.8L SC (271.948) (2003)
Seat Back Frame: All Technical Service Bulletins
Interior - Front Seat Backrest Noise
Noises from backrest frame
Topic number
LI91.10-P-048497
Version
1
Design group
91.10 Front seats
Date
03-24-2010
Validity
203, 204, 209, 211, 219 Restriction is given in the plain text.
Reason for change
Valid model designations updated / Supersedes DTB SB-91.10/112f
Reason for block
Complaint:
Noise complaints when load on backrest frame changes.
Affects the driver and front passenger seats.
Also perform the remedial action if you are performing work on
- Backrest frame (91013),
- Backrest cover (91A15, 91N15) or
- Head restraint guide rail (91A33, 91N33).
The actions must always be performed if the backrest frame is exposed to avoid follow-up repairs.
Attachments
Cause:
1. Affects all vehicles (see Figures 1, 2, 3).
1. At low temperatures (- C°), natural vibrations of the lordosis basket can result in damage to the guide wire when a person sits down in the seat.
2. Only affects vehicles produced up to September 05 (see Figure 4).
2. The Pulmaflex mat rubs on the attachment points on the backrest frame (2 attachment points on the right and 2 on the left).
3. Affects model series CL203 and 209 (see Figures 5, 6) Relative movement can produce noise problems at the bottom of the backrest.
4. Affects all vehicles of model series 211 and 219 (see Figure 7)
Noises may occur in the backrest under load due to the incorrect positioning of the circlip.
Remedy:
Note: