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Technical Service Bulletin # Mercedes Benz Truck GL 450 LI82-10_P-0517692 Date: 120905

Technical Service Bulletin # Mercedes Benz Truck GL 450 LI82-10_P-0517692 Date: 120905

Lighting - Headlamp Unit Fogged/Droplets Forming

Lamp unit fogged/droplets forming

Topic number LI82.10-P-051769

Version 2

Design group 82.10 Exterior lights

Date 09-05-2012

Validity All models

Reason for change New repair method

Complaint

Lamp unit fogged or droplets forming.

Cause

Due to the vent openings, the lamp unit is an "open system".

This means that acidic gases, moisture, dirt and exhaust gases can penetrate it.

This can result in deposits on the diffuser and lens.

Remedy

Check housing cover of lamp unit for natural fogging or dew as per LI82.10-P-050139.

1. If a reduction in the degree of fogging is visible, the pressure compensation membrane can be inserted after complete evaporation of the dew.

2011 Mercedes Benz Truck GL 450 (164.871) V8-4.6L (273.923) Page 32

2. If no reduction in the degree of fogging is visible, the lamp unit is defective and must be replaced.

However, the cover with the pressure compensation membrane should also be attached in this case.

Note:

Residual fogging is possible due to the laws of physics and is OK.

Fogging does not impair the functionality or the service life of the lamp unit.

Pressure compensation membranes should always be used on both lamp units.

Attach housing cover with pressure compensation membrane:

1. Remove lamp unit

2. Remove all vent opening grommets.

3. Seal vent openings with sealing profile.

Important:

All openings must be sealed carefully for the pressure compensation membrane to work properly!

4. Insert housing cover with pressure compensation membrane.

5. Install lamp unit.

W/S 204 Attach pressure compensation membrane to housing cover of lamp unit:

1. Remove lamp unit

2. Remove all vent opening grommets.

3. Seal vent openings with sealing profile.

Important:

All openings must be sealed carefully for the pressure compensation membrane to work properly!

4. Remove housing cover of lamp unit.

5. Drill and deburr three holes in the housing cover of the lamp unit as per the template (see attachment).

6. Glue on the pressure compensation membrane.

Bonding note:

The substrate must be free of dust and grease.

7. Reattach housing cover of lamp unit.

8. Install lamp unit.

File Designation

Symptoms

2011 Mercedes Benz Truck GL 450 (164.871) V8-4.6L (273.923) Page 33

Parts

Operation numbers/damage codes

2011 Mercedes Benz Truck GL 450 (164.871) V8-4.6L (273.923) Page 34