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.
Mercedes-Benz A220 2020 Page 354
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:
Be careful not to cause damage due to the lever slipping or by applying excessive force!
- Carry out procedure for all 3 areas marked (see picture DSCN6128).
- Check clearance at lowermost position (see picture DSCN6129).
2. Adjust seat height all the way up and grease the crash lock on the tunnel side with lubricant.(see picture DSCN6130)
Use damage code 91A27 36/91N27 36.
3. Adjust seat fore/aft adjustment to the rear, lift the spring for inclination adjustment slightly with a screwdriver and grease with lubricant. (see
picture DSCN6132 and DSCN6133)
Use damage code 91A27 36/91N27 36.
*Sufficient for 20 repairs, submit as Local Purchase - SAA00213, Qty 1, handling is included
** Sufficient for 20 repairs, submit as Local Purchase - MUL00309, Qty 1, handling is included
Mercedes-Benz A220 2020 Page 355
Attachments
Symptoms
Parts
Work units
Mercedes-Benz A220 2020 Page 356
Validity
Attachment - Lumbar support frame
Mercedes-Benz A220 2020 Page 357
Attachment - Constriction between cushion shell and ring gear
Attachment - Backrest wire frame
Attachment - Backrest wire frame
Mercedes-Benz A220 2020 Page 358
Attachment - Cable ties on lumbar support frame
Attachment - Cable ties on lumbar support frame (rear view)
Attachment - Position of screwdriver on cushion shell
Mercedes-Benz A220 2020 Page 359
Attachment - Position of screwdriver on inside of ring gear
Attachment - Bending position
Attachment - Deformed cushion shell
Mercedes-Benz A220 2020 Page 360
Attachment - Crash lock
Attachment - Inclination adjustment spring
Mercedes-Benz A220 2020 Page 361
Attachment - Inclination adjustment spring
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