Lighting - Headlamp Unit Fogged/Droplets Forming

Lamp unit fogged/droplets forming

Topic number L182.10-P-054552

Version 2

Design group 82.10 Exterior lights

Date 02-12-2013

Validity Model 166

Reason for change New replacement part number

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 L182.10-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.

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:
In order for the pressure compensation membrane to be effective it is vital that all the openings are carefully sealed! Positions of vent openings, see Figure 1.

4. Insert housing cover with pressure compensation membrane.

5. Install lamp unit.











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