# Service bulletin LI82.10\-P\-063240

A bulletin is a manufacturer's communication to its dealers, as NHTSA indexes it. The summary is NHTSA's. The document is the manufacturer's: read it at NHTSA. A bulletin is not a recall, and listing a model year does not mean every vehicle of it is concerned.

- Type: Service bulletin
- NHTSA id: 10177572
- Published by NHTSA: 2020\-07\-27
- Manufacturer's number: LI82.10\-P\-063240
- Manufacturer's date: 2020\-06\-30
- NHTSA component: EQUIPMENT; EXTERIOR LIGHTING:HEADLIGHTS; EQUIPMENT ADAPTIVE/MOBILITY

## NHTSA's summary

Lamp unit fogged or droplets forming. Because of the housing cover with pressure compensation membrane, the lamp unit is a ?closed system?. This means that the lamp unit is protected against acid gases, dirt and exhaust gas. However, moisture can still enter from two sources. Through absorption and desorption \(the commonest cause\) or through permeation. Moisture is either absorbed by the plastic material and, when the light source is switched on, it is released from the plastic by desorption, or the moisture penetrates through the plastic materials of the headlamp from outside \(permeation\). This can lead to the formation of condensation on the lens of the headlamp.

## The document

- [NHTSA's copy of the document (PDF)](https://static.nhtsa.gov/odi/tsbs/2020/MC-10177572-0001.pdf)
- [If that address does not open, try this one](https://static.nhtsa.gov/odi/tsbs/2020/MC-10177572-9999.pdf)

The document is the manufacturer's. This site does not hold it.

## Components

Equipment and accessories, Lighting, Headlights

## Vehicles listed

- MERCEDES\-BENZ MERCEDES\-BENZ

JSON: [/v1/bulletins/10177572](/v1/bulletins/10177572)

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