Lamp Unit Fogged/Droplets Forming (LI82.10-P-051769)

Publication date: 2014-01-24
Reference number: LI82.10-P-051769

LAMP UNIT FOGGED/DROPLETS FORMING

TECHNICAL SERVICE BULLETIN

Reference Number(s): LI82.10-P-051769 Version 7, Date of Issue: January 24, 2014

Mercedes-Benz:	All models (without option code 640 Full LED headlamps)
Design Group:	82.10 Exterior lights
Reason For Change:	Validity changed

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 .

If a reduction in the degree of fogging is visible, the pressure compensation membrane can be inserted after complete evaporation of the dew.
If no reduction in the degree of fogging is visible, the lamp unit is defective and must be replaced.

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:

Remove lamp unit
Remove all vent opening grommets.
Seal vent openings with sealing cord.
IMPORTANT: All openings must be sealed carefully for the pressure compensation membrane to work properly!
Insert housing cover with pressure compensation membrane.
Install lamp unit.

ATTACHMENTS

File	Designation
	Protective housing - housing cover - headlamp cover

SYMPTOMS

Overall vehicle/Lighting/Exterior lights/Driving lights/Main headlamps/Fogged

PARTS

PARTS INFORMATION

Part number	Designation	Quantity	Note	EPC
A 000 826 89 24	Protective cover - small housing cover	2	for both headlamps	X
A 005 989 12 71	Sealing cord	1		X
A 000 826 81 24	Protective cover - housing cover	2	for both headlamps	X

WORK UNITS

Op. no.	Operation text	Time	Damage code	Note
			82P01 Y1
			82B01 Y1