# Service bulletin LI82.10\-P\-078896

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: 11028989
- Published by NHTSA: 2026\-02\-24
- Manufacturer's number: LI82.10\-P\-078896
- Manufacturer's date: 2026\-02\-24
- NHTSA component: EXTERIOR LIGHTING

## NHTSA's summary

Complaint Headlamps leaking or fogged Cause The fogging of the headlamp is a natural phenomenon which can occur under certain climatic conditions. In contrast to a leaky headlamp, physical fogging does not result in a technical impairment of the headlamp. A leak test must be performed to determine if physical fogging exists or if the headlamp is leaky. Remedy Check for external damage: You can identify a damaged headlamp in the following way: For headlamps with a closed system 1. Check the headlamps for any external damage and check also for correct seating of the Gore\-diaphragm/correct latching of the cover caps. 2. If the headlamp exhibits any external damage, replace the headlamp. For headlamps with an open system 1. Check the headlamps for any external damage and seal off the vent, then make sure the cover caps are latched correctly into place. 2. If the headlamp exhibits any external damage, replace the headlamp. Note: External damage to the headlamp does not present a warranty or goodwill case. 1. Clear fogged/condensed LED headlamps and LED rear lamps: 1. Drive the vehicle into the workshop \(temperature higher than \+18 °C/\+64.4°F\). Note: Do not perform an engine wash before the defogging test. 2. Switch off the engine and connect battery support via a charger. 3. Open the hood or trunk. 4. Switch on the lights. 5. Leave the vehicle in this state for 60 minutes. 6. Check for formation of condensation, a significant reduction in the formation of condensation must be clearly recognizable \(thawing progress\). 7. If the condensation has disappeared, nothing else has to be done. Note: If defrosting has been performed, you can skip the first step. 2. Leak test of headlamp with overpressure: • Connect test adapter to pressure tester. \(Figure 1\) • Check test adapter for leak tightness. To do so, connect plug and coupling \(picture 2\) and apply a maximum overpressure of 30 mbar. The pressure must remain constant. If the pressure does not remain constant, use a new adapter. • All vents have to be sealed with sealing compound and the existing diaphragm with the stamp \(picture 3 \[3\]\). \(Picture 4\) Make allowance for the different headlamp variants here \(there are different outlet openings\). • Check if the headlamp needs to be removed to gain access to the diagnostic socket on the headlamp housing. • Plug the adapter onto the diagnostic socket on the headlamp housing. \(Picture 5\). • Apply a maximum of 30 mbar overpressure to the headlamp housing. Note: If the maximum overpressure of 50 mbar is exceeded the headlamp seal will be damaged \(picture 6\). • If a pressure drop of less than 10 mbar is measured within 30 seconds, the headlamp is tight and there is natural physical condensation. • If a higher pressure drop than 10 mbar is measured within 30 seconds, the headlamp is leaky. Note: The leaky position can be localized with the aid of soap suds. If the pressure test is not passed, the headlamp is leaky. If the cause cannot be rectified, the headlamp must be replaced. Note: If the headlamp is replaced, no dry packs may be installed on the new replacement headlamp. AR82.10\-P\-5455WT was created for the pressure test. \*\*NOTE \- As of Sept 2025 the pressure testing tool is not finalized and may require modifications to fit properly. This AR can be used as a reference manual for all closed headlamps. In the event of an open headlamp system, the vent ducts must be sealed before the pressure test.

## The document

- [NHTSA's copy of the document (PDF)](https://static.nhtsa.gov/odi/tsbs/2026/MC-11028989-0001.pdf)
- [If that address does not open, try this one](https://static.nhtsa.gov/odi/tsbs/2026/MC-11028989-9999.pdf)

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

## Components

Lighting

## Vehicles listed

- 2008 MERCEDES BENZ AMG CLK63
- 2007 MERCEDES BENZ AMG R63
- 2002 to 2006 MERCEDES BENZ CL500
- 2003 to 2006 MERCEDES BENZ CL55
- 2007 to 2009 MERCEDES BENZ CL550
- 2002 to 2009 MERCEDES BENZ CL600
- 2008 to 2009 MERCEDES BENZ CL63
- 2005 to 2006 MERCEDES BENZ CL65
- 2008 to 2009 MERCEDES BENZ CL65
- 2002 to 2005 MERCEDES BENZ CLK320
- 2006 to 2009 MERCEDES BENZ CLK350
- 2002 to 2003 MERCEDES BENZ CLK430
- 2003 to 2006 MERCEDES BENZ CLK500
- 2006 MERCEDES BENZ CLK55
- 2007 to 2009 MERCEDES BENZ CLK550
- 2007 MERCEDES BENZ CLK63
- 2006 MERCEDES BENZ CLS500
- 2007 to 2009 MERCEDES BENZ CLS550
- 2003 to 2009 MERCEDES BENZ E320
- 2003 to 2006 MERCEDES BENZ E500
- 2007 to 2009 MERCEDES BENZ E550
- 2007 to 2009 MERCEDES BENZ GL320
- 2007 to 2009 MERCEDES BENZ GL450
- 2008 to 2009 MERCEDES BENZ GL550
- 2007 to 2009 MERCEDES BENZ ML320
- 2006 to 2009 MERCEDES BENZ ML350
- 2006 to 2007 MERCEDES BENZ ML500
- 2008 to 2009 MERCEDES BENZ ML550
- 2007 to 2009 MERCEDES BENZ R320
- 2006 to 2007 MERCEDES BENZ R500
- 2007 to 2008 MERCEDES BENZ S550
- 2007 to 2009 MERCEDES BENZ S600
- 2008 to 2009 MERCEDES BENZ S63
- 2007 to 2009 MERCEDES BENZ S65
- 2003 to 2006 MERCEDES BENZ SL500
- 2003 to 2009 MERCEDES BENZ SL55
- 2007 to 2009 MERCEDES BENZ SL550
- 2004 to 2009 MERCEDES BENZ SL600
- 2005 to 2009 MERCEDES BENZ SL65
- 2004 to 2005 MERCEDES BENZ SLK230
- 2005 to 2009 MERCEDES BENZ SLK280
- 2004 MERCEDES BENZ SLK32
- 2002 to 2005 MERCEDES BENZ SLK320
- 2005 to 2009 MERCEDES BENZ SLK350
- 2005 to 2009 MERCEDES BENZ SLK55
- 2014 to 2019 MERCEDES\-BENZ AMG CLA45
- 2003 to 2005 MERCEDES\-BENZ AMG CLK55
- 2019 to 2021 MERCEDES\-BENZ AMG CLS53
- 2006 MERCEDES\-BENZ AMG CLS55
- 2007 to 2011 MERCEDES\-BENZ AMG CLS63
- 2017 to 2018 MERCEDES\-BENZ AMG CLS63
- 2017 to 2018 MERCEDES\-BENZ AMG E43
- 2019 to 2023 MERCEDES\-BENZ AMG E53
- 2004 to 2006 MERCEDES\-BENZ AMG E55
- 2007 to 2009 MERCEDES\-BENZ AMG E63
- 2023 MERCEDES\-BENZ AMG E63 S
- 2014 to 2015 MERCEDES\-BENZ AMG E63S
- 2018 to 2022 MERCEDES\-BENZ AMG E63S
- 2015 to 2018 MERCEDES\-BENZ AMG GLA45
- 2016 to 2023 MERCEDES\-BENZ AMG GLC43
- 2018 to 2021 MERCEDES\-BENZ AMG GLC63
- 2020 to 2021 MERCEDES\-BENZ AMG GLC63 S
- 2018 to 2019 MERCEDES\-BENZ AMG GLC63S
- 2016 to 2019 MERCEDES\-BENZ AMG GLE43
- 2016 to 2019 MERCEDES\-BENZ AMG GLE63
- 2018 MERCEDES\-BENZ AMG GLE63S
- 2017 to 2019 MERCEDES\-BENZ AMG GLS63
- 2007 to 2015 MERCEDES\-BENZ AMG ML63
- 2013 to 2021 MERCEDES\-BENZ AMG S63
- 2015 to 2019 MERCEDES\-BENZ AMG S65
- 2016 MERCEDES\-BENZ AMG SL63
- 2018 to 2019 MERCEDES\-BENZ AMG SL63
- 2017 to 2019 MERCEDES\-BENZ AMG SL65
- 2017 to 2020 MERCEDES\-BENZ AMG SLC43
- 2013 MERCEDES\-BENZ AMG SLK55
- 2015 MERCEDES\-BENZ AMG SLK55
- 2010 to 2014 MERCEDES\-BENZ CL550
- 2010 to 2014 MERCEDES\-BENZ CL600
- 2010 to 2014 MERCEDES\-BENZ CL63
- 2010 to 2014 MERCEDES\-BENZ CL65
- 2018 to 2019 MERCEDES\-BENZ CLA 250
- 2014 to 2017 MERCEDES\-BENZ CLA250
- 2016 MERCEDES\-BENZ CLS 400
- 2019 to 2023 MERCEDES\-BENZ CLS 450
- 2016 MERCEDES\-BENZ CLS 550
- 2018 MERCEDES\-BENZ CLS 550
- 2016 MERCEDES\-BENZ CLS 63S
- 2015 MERCEDES\-BENZ CLS400
- 2010 to 2015 MERCEDES\-BENZ CLS550
- 2017 MERCEDES\-BENZ CLS550
- 2012 to 2015 MERCEDES\-BENZ CLS63
- 2014 to 2015 MERCEDES\-BENZ CLS63S
- 2018 to 2019 MERCEDES\-BENZ E 300
- 2020 to 2023 MERCEDES\-BENZ E 350
- 2018 MERCEDES\-BENZ E 400
- 2019 to 2023 MERCEDES\-BENZ E 450
- 2014 to 2016 MERCEDES\-BENZ E250
- 2017 MERCEDES\-BENZ E300
- 2006 to 2016 MERCEDES\-BENZ E350
- 2015 to 2017 MERCEDES\-BENZ E400
- 2013 to 2015 MERCEDES\-BENZ E400 HYBRID
- 2010 to 2017 MERCEDES\-BENZ E550
- 2010 to 2015 MERCEDES\-BENZ E63
- 2010 to 2011 MERCEDES\-BENZ GL320
- 2013 to 2016 MERCEDES\-BENZ GL350
- 2010 to 2014 MERCEDES\-BENZ GL450
- 2010 to 2012 MERCEDES\-BENZ GL550
- 2015 to 2017 MERCEDES\-BENZ GL550
- 2013 to 2016 MERCEDES\-BENZ GL63
- 2015 to 2020 MERCEDES\-BENZ GLA 250
- 2018 to 2023 MERCEDES\-BENZ GLC 300
- 2018 MERCEDES\-BENZ GLC 350 E
- 2020 MERCEDES\-BENZ GLC 350 E
- 2019 MERCEDES\-BENZ GLC350E
- 2018 MERCEDES\-BENZ GLE 350
- 2018 to 2019 MERCEDES\-BENZ GLE 400
- 2018 MERCEDES\-BENZ GLE 550 E
- 2016 MERCEDES\-BENZ GLE300D
- 2016 to 2017 MERCEDES\-BENZ GLE350
- 2016 MERCEDES\-BENZ GLE350D
- 2016 to 2017 MERCEDES\-BENZ GLE400
- 2016 to 2017 MERCEDES\-BENZ GLE450
- 2016 to 2017 MERCEDES\-BENZ GLE550E
- 2016 to 2017 MERCEDES\-BENZ GLE63S
- 2013 to 2015 MERCEDES\-BENZ GLK250
- 2010 to 2015 MERCEDES\-BENZ GLK350
- 2018 to 2019 MERCEDES\-BENZ GLS 450
- 2018 to 2019 MERCEDES\-BENZ GLS 550
- 2016 to 2017 MERCEDES\-BENZ GLS450
- 2017 MERCEDES\-BENZ GLS550
- 2015 MERCEDES\-BENZ ML250
- 2010 to 2011 MERCEDES\-BENZ ML320
- 2010 to 2015 MERCEDES\-BENZ ML350
- 2015 MERCEDES\-BENZ ML400
- 2010 to 2011 MERCEDES\-BENZ ML450
- 2010 to 2015 MERCEDES\-BENZ ML550
- 2010 MERCEDES\-BENZ R320
- 2006 to 2012 MERCEDES\-BENZ R350
- 2018 to 2020 MERCEDES\-BENZ S 450
- 2018 to 2019 MERCEDES\-BENZ S 550
- 2021 MERCEDES\-BENZ S 560
- 2019 to 2020 MERCEDES\-BENZ S 560 E
- 2012 to 2013 MERCEDES\-BENZ S350
- 2010 to 2013 MERCEDES\-BENZ S400
- 2010 to 2017 MERCEDES\-BENZ S550
- 2016 to 2017 MERCEDES\-BENZ S550 4MATIC
- 2016 MERCEDES\-BENZ S550 HYBRID
- 2015 MERCEDES\-BENZ S550E
- 2017 MERCEDES\-BENZ S550E
- 2010 to 2013 MERCEDES\-BENZ S600
- 2015 to 2017 MERCEDES\-BENZ S600
- 2010 to 2012 MERCEDES\-BENZ S63
- 2017 MERCEDES\-BENZ S63
- 2010 to 2013 MERCEDES\-BENZ S65
- 2017 MERCEDES\-BENZ S65 AMG
- 2017 MERCEDES\-BENZ S650
- 2018 to 2020 MERCEDES\-BENZ SL 450
- 2018 to 2020 MERCEDES\-BENZ SL 550
- 2015 to 2016 MERCEDES\-BENZ SL400
- 2017 MERCEDES\-BENZ SL450
- 2011 MERCEDES\-BENZ SL550
- 2013 to 2017 MERCEDES\-BENZ SL550
- 2013 to 2015 MERCEDES\-BENZ SL63
- 2017 MERCEDES\-BENZ SL63
- 2013 to 2015 MERCEDES\-BENZ SL65
- 2018 to 2020 MERCEDES\-BENZ SLC 300
- 2017 MERCEDES\-BENZ SLC 43 AMG
- 2016 to 2017 MERCEDES\-BENZ SLC300
- 2002 to 2003 MERCEDES\-BENZ SLK230
- 2014 to 2016 MERCEDES\-BENZ SLK250
- 2015 to 2016 MERCEDES\-BENZ SLK300
- 2012 to 2016 MERCEDES\-BENZ SLK350
- 2014 MERCEDES\-BENZ SLK55
- 2016 MERCEDES\-BENZ SLK55 AMG
- 2013 MERCEDES\-BENz SLK250
- 2021 MERCEDES\-MAYBACH S 560
- 2018 to 2020 MERCEDES\-MAYBACH S 560 4MATIC
- 2018 to 2020 MERCEDES\-MAYBACH S 650
- 2017 MERCEDES\-MAYBACH S550
- 2017 MERCEDES\-MAYBACH S600
- 2017 MERCEDES\-MAYBACH S650

JSON: [/v1/bulletins/11028989](/v1/bulletins/11028989)

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