LI91.10-P-048497 Service Bulletin/Repair Instructions

Noises from backrest frame

Topic number
Ll91.1 O-P-048497
Version
2
Design group
91.10 Front seats
Date
07-12-2014
Validity
203,209,211,219

Restriction is given in the plain text.
Reason for change
Damage code updated

Remedy revised
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

- backrest cover or

- guide rail of head restraint.

If the backrest frame is exposed as a result, the actions must always be performed in order to avoid follow-up repairs.
Attachments

File
Description
Lordosekorb_ 1.pdf
Figure 1
Leichte_Beschiidigung.pdf
Figure 2
Starke_Beschiidigung.pdf
Figure 3
Cause:

1. Affects all vehicle (see picture 1,2,3).

1. At low temperatures (- C 0 ), natural vibrations of the lumbar basket can result in damage to the guide wire when a

person sits down in the seat.

2. Only affects vehicles produced up to 09/05 (see picture 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 picture 5,6)

Relative movement can produce noise problems at the bottom of the backrest.

07-12-2014 2:59 AM

©Copyright Daimler AG
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}(EN
RY
4. Affects all vehicles of model series 211 and 219 (see picture 7)

Noises may occur in the backrest under load due to the incorrect positioning of the circlip.
Remedy:

Note: If one of the complaints is present, always perform the other measure too (i.e. measure 1, 2, 3 and 4), irrespective of whether they were the subject of the customer complaint. The aim is to ensure that the customer does not return to the workshop again with complaints about noise from the seat.

Take the restrictions (e.g. model series, production date) into consideration and perform the appropriate measures.

Measures are to be performed with the seat installed.

1. Proceed as follows (see point 1. Affects all vehicles):

- Reproduce noise caused when a person sits in seat at low temperatures.

- Remove seat-back lining and check whether guide wires are damaged at points where they intersect with lumbar

basket (on both right and left side). (Figure 1- Lordosenkorb 1.pdf.)

- If guide wire is slightly damaged (picture 2 - Leichte Beschiidigung.pdf), damaged area must be coated with following agent: Krytox (A0009895051)

- If guide wire is seriously damaged (Figure 3- Starke Beschiidigung.pdf), the damaged areas on the Pulmaflex mat

must be rubbed down with emery cloth, wrapped with Coroplast tape (commercially available plastic adhesive tape)

and coated with Krytox (A0009895051).

2. Then also perform step 2 for all vehicles produced up to 09/05 (see AR91.10-P-3332T):

- Detach backrest lining (already detached in step 1)

- Remove sidebag unit

- Detach Pulmaflex mat from attachment points on backrest frame

- Attach one piece of felt to each attachment point (2 on the right and 2 on the left)

The exact positions are the points marked in red in the illustration "Felting of backrest frame''.

The felt must be treated with Krytox (A0009895051) beforehand.

- After applying the felt pieces, reattach the Pulmaflex mat.

Object number of felt to be used: A0019835110

Dimensions: 25 mm wide and 2 mm thick.

3. For model series CL203 and 209, also perform the following measures:

- Seat-back lining still removed (see picture 5). The seat is in installed position in the vehicle.

- Detach covering and spray the rivets (see picture 6) in area between side section of frame and crossmember with

agent A002 989 06 51.
4. The following measure must be implemented on all vehicles of model series 211 and 219:

Check the alignment of the circlip on the head restraint guide sleeve and correct it if necessary as shown in Figure 7

"Position of circlip".

07-12-2014 2:59 AM

©Copyright Daimler AG
PLUBONS

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ENTRY

After reattaching the cover and the seat-back lining, sit in the seat to check whether the noises are produced.
Attachments

File
Description
Filzen Lehnenrahmen.pdf
Picture 4: Positions of points to be felted.

Apply felt to the points marked by the red arrow.
Rahmenseitenteil und Quertraverse.pdf
Figure 6
Position Sicherungsring.pdf
Figure 7
Spannteil losen.pdf
Figure 5
Symptoms

Body I Seat I Seat noises I Cracking

Body I Seat I Seat noises I Grunting

Body I Seat I Seat cover I Chafed through

Body I Seat I Seat cover I Pilling/knots

Body I Seat I Seat noises I Creaking
Parts

Part number
ES1 ES2
Designation
Quantity Note
EPC Other

make

part
A 001 983 23 10
Felt roll
1
A 001 989 36 60
Kry1ox
1
A 000 989 36 60
Kry1ox
1
Instead of Kry1ox with the object number A0019895051,

that with the object number

A0019893660 can also be

used.
A 002 989 06 51
Lock cylinder grease, spray
1
Can be found in the noise kit A

000 560 03 50.
A 002 989 06 51
Enter description here
1
x

x

x
x

x
Work units

Op. no.
Operation text
07-12-2014 2:59 AM

©Copyright Daimler AG
Time
Damage

code
Note
91A15 36
Left front seat backrest cover
91N1536
Right front seat backrest cover
91A33 36
Left front seat head restraint guide
91N33 36
Right front seat head restraint guide
91N41 36
Right front seat backrest frame
91A41 36
Left front seat backrest frame
PLUBONS

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'"I
WIS-References

Document number
Title
AR91.1 O-P-3332T
Apply felt strip to attachment

points on front seat backrest
Note
Allocation

Remedy
frame
Validity

Vehicle
Engine
Transmission
203.004
•

•

•

•
•

•

•
•
•

•
•
203.020
•
•
203.035
•

•

•

•

•
•
•
203.061
•

•

•

•

•
203.064
•
203.065

203.076
•

•
•
203.081
•
•
203.084
•
•
203.087
•

•
.•
•

•
•
203.006

203.007

203.008

203.016

203.018
203.040

203.042

203.043

203.045

203.046

203.052

203.054

203.056
203.092

203.204

203.207
.
203.208
•
203.216
•
203.218
•
203.220

203.240
•

•

•
203.242
•
203.206
203.235
07-12-2014 2:59 AM

©Copyright Daimler AG
•
•

•

•

•

•
•

•

•

•

•
•
.
•

•

•

•

•

•
•

•
PLUBONS

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}CE NT RY

203.243

203.245

203.246

203.252

203.254

203.256

203.261

203.264

203.265

203.276

203.281

203.284

203.287

203.292

203.706

203.707

203.708

203.718

203.735

203.740

203.741

203.742

203.743

203.745

203.746

203.747

203.752

203.756

203.764

CLK (209)

CLS (219)

E (211)
•

•

•

•

•

•

•

•

•

•

•

•

•

•

•

•

•

•

•

•
•

•

•

•

•

•

•

•

•

•

•

•

•
.

•

•

•

•

•

•
•
•
•

•
•

•

•

•

•

•

•

•

•
•

•

•

•

•

•

•

•

•
•

•
Full model designation breakdown

Vehicle
Engine
Transmission
203.004
611.962

611.962
716.601
203.004

203.004

203.006

12 3 4

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