Fogged Headlamp With Desiccant Pack
Installed - Open Ventilation System
Topic number

LI82.10-P-078302

Version

1

Function group

82.10 - Exterior lights

Date

9/9/24

Validity

Service cover small:
Model series 246 facelift with code: 613, 620
Model series 204 with code: 613, 620
Model series 205 before facelift with code: 613, 620
Model series 117 before facelift with code: 613, 620
Model series 172 before facelift with code: 613, 620, 621,
622
Model series 218 before facelift with code: 614, 615, 616,
618
Model series 216 with code: 621, 622
Service cover large:
Model series 176 with code 613, 620
Model series 177 with code 613, 620
Model series 242 with code 613, 620, 614, 615, 616, 618,
621, 622
Model series 246 before facelift with code: 613, 620, 614,
615, 616, 618, 621, 622
Model series W247 with code: 613, 620
Model series 204 with code: 614, 615, 616, 618, 621, 622
Model series 118 with code: 613, 620
Model series 219 with code: 613, 620, 614, 615, 616, 618
Model series 211 code: 613, 620, 614, 615, 616, 618,
621, 622
Model series 212 before facelift with code: 614, 615, 616,
618, 621, 622
Model series 213 before facelift with code: 613, 620

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Model series 207 before facelift with code: 614, 615, 616,
618, 621, 622
Model series X247 with code: 613, 620
Model series X204 facelift with code: 613, 620, 614, 615,
616, 618, 621, 622
Model series 164 with code: 613, 620, 614, 615, 616, 618
Model series 166 with code: 613, 620
Model series 292 with code: 613, 620
Model series 221 before facelift with code: 613, 620, 621,
622
Model series 221 facelift with code: 614, 615, 616, 618,
621, 622
Model series 171 with code: 613, 620, 614, 615, 616, 618
Model series 251 before facelift with code: 613, 620, 614,
615, 616, 618, 621, 622
Model series 232 with code: 631, 632, 640, 641, 642,
316, 317, 318
Reason for change

Complaint
Headlamps fogged or droplets forming.

Cause
Due to its outlet openings, the headlamp is an "open system".
This means that acidic gases, moisture, dirt and exhaust gases can penetrate into the headlamp.
This can lead to the formation of condensation on the lens of the headlamp. The headlamps comply with all applicable
US standards and regulations.

Remedy
Check housing cover of lamp unit for natural fogging or condensation as per LI82.10-P-078301.
If a reduction in the degree of fogging is visible, the desiccant packs can be used once the condensation has completely evaporated.
Note: Order service covers and desiccant packs based on the validity description.
1. Remove headlamps.
2. Remove all grommets from outlet openings.
3. Seal vent openings with sealing profile.
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Important: All openings must be sealed carefully for the pressure compensation diaphragm to work properly!
4. Remove existing service cover.
5. Place desiccant packs into the new service covers and bolt down (Picture_01).
6. Glue the new diaphragm onto the intended surface at the service cover (Picture_02).
Note: The bonding surface must be clean and dry.
7. Attach service cover with desiccant pack at headlamp.
8. Install headlamp.
To ensure that the desiccant pack (absorption) acts effectively, the headlamp has to be air-sealed.
Observe or check the following points for this:
1. Seals at the central connector must all be present and correctly fitted (Picture_03).
2. The new transparent diaphragm must be correctly bonded (Picture_04).
3. Check headlamp housing for any external damage.

Attachments
File

Description

Bild_01.jpg

1) Service cover for desiccant pack 2) Desiccant pack 3)
Threaded connection

Bild_02.jpg

1) Service cover 2) Diaphragm 3) Grille 4) Screw

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Bild_03.jpg

1) Missing seals in central connector 2) Incorrectly fitted
seals in central connector

Bild_04.jpg

Bonding position of the transparent diaphragm

Disclaimer
NOTE: The information contained in this document is intended for use by trained, professional technicians with the
knowledge to properly and safely perform diagnosis and repairs on Mercedes-Benz vehicles, using Mercedes-Benz
approved tools and equipment. It informs service technicians about conditions that could occur in certain vehicles and
provides information that could assist in proper vehicle diagnosis, service, or repair. It does not indicate that a defect
is present in any vehicle referenced in this document nor does it imply warranty coverage. DO NOT assume that a
symptom or condition, or a described cause of a symptom or condition, affects any particular vehicle or groups of vehicles, or that a described repair applies to any particular vehicle or groups of vehicles. There can be multiple causes
resulting in the same or similar symptoms or conditions described in this document, and trained professional service
technicians must use their diagnostic skills to make evaluations on a case-by-case basis. The information contained
in this document does not guarantee warranty coverage nor does it extend the vehicle’s warranty in any way.

Symptoms
Lighting > Exterior lights > Driving lights > Main headlamps > Fogged

Parts
Part number

ES1 ES2 Designation

Quantity Note

EPC

A0008260900

Small service cover

1

Including diaphragm

X

A0008261000

Large service cover

1

Including diaphragm

X

Desiccant pack (20g)

1

Desiccant pack per service cover

X

Sealing profile

1

A0008261600

11

A005989127111
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X

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Operation numbers/damage codes
Op. no.

Operation text

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Time

CCUSHWA

Damage
code

Note

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