# Service bulletin LI82.10\-P\-078301

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: 11031580
- Published by NHTSA: 2026\-04\-27
- Manufacturer's number: LI82.10\-P\-078301
- Manufacturer's date: 2026\-04\-16
- NHTSA component: EXTERIOR LIGHTING

## NHTSA's summary

Complaint Headlamp, front fog lamp leaky or fogged. Cause Fogging of the headlamps is a natural phenomenon, which can occur under certain climatic conditions. It does not lead to any technical impairment of the headlamp. If a pressure compensation diaphragm is fitted in the housing cover, then the lamp unit is a "closed system". Remedy Headlamp: Remedy 1 Clearing fogged/condensed LED headlamps: 1. Drive vehicle into workshop \(temperature higher than \+18 °C/\+64.4 °F\) and connect the exhaust extraction. 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. 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 \(thawing progress\). Clearing of fogged/condensed LED headlamps and LED rear lamps on electric vehicles: 1. Drive the vehicle into the workshop \(temperature higher than \+18 °C/\+64.4°F\). 2. Connect battery backup via a charger. 3. Open the front\-end flap and ensure sufficient ventilation. 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 \(thawing progress\). Clearing fogged/condensed halogen/xenon headlamps: 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. 3. Open the hood. 4. Switch off 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 \(thawing progress\). Note: If there is no visible reduction in condensation, check the headlamp for malfunctions. \(see Remedy 2\) It is not physically possible to defog the headlamps completely. Fogging does not impair the operation or the service life of the headlamp. Note: Only implement Remedy 1 for model series 463 \(from model year 2018\) and model series 465. Remedy 2 A defective headlamp can be identified as follows: 1. Check the headlamp for external damage and that the cover caps and the diaphragm are correctly seated. 2. Check the electrical connectors of the plugs and pins. 3. Check for leak tightness according to LI82.10\-P\-078307. The test can only be conducted on headlamps. 4. If the headlamp or the rear lamp has any external damage, replace the component part in accordance with the WIS instructions. Note: External damage to the headlamp/rear lamp or faulty seating of the cover caps does not present a warranty or goodwill case. Note: With headlamps, it is possible to install desiccant packs if the problem occurs repeatedly. • Open ventilation system LI82.10\-P\-078302 • Closed ventilation system LI82.10\-P\-078304

## The document

- [NHTSA's copy of the document (PDF)](https://static.nhtsa.gov/odi/tsbs/2026/MC-11031580-0001.pdf)
- [If that address does not open, try this one](https://static.nhtsa.gov/odi/tsbs/2026/MC-11031580-9999.pdf)

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

## Components

Lighting

## Vehicles listed

- 2004 to 2012 MAYBACH MAYBACH
- 2020 to 2021 MERCEDES EQA
- 2005 MERCEDES BENZ 211
- 2018 MERCEDES BENZ A 220
- 2007 MERCEDES BENZ A170
- 2008 MERCEDES BENZ AMG CLK63
- 2007 to 2009 MERCEDES BENZ AMG E53
- 2026 MERCEDES BENZ AMG GLE53 4MATIC
- 2026 MERCEDES BENZ AMG GLE63 S 4MATIC
- 2026 MERCEDES BENZ AMG GLS63 4MATIC
- 2007 MERCEDES BENZ AMG R63
- 2018 MERCEDES BENZ C 300 4MATIC
- 2002 to 2007 MERCEDES BENZ C230
- 2002 to 2007 MERCEDES BENZ C240
- 2005 to 2007 MERCEDES BENZ C280
- 2008 to 2009 MERCEDES BENZ C300
- 2002 to 2007 MERCEDES BENZ C320
- 2006 to 2009 MERCEDES BENZ C350
- 2006 to 2009 MERCEDES BENZ C36 AMG
- 2006 to 2009 MERCEDES BENZ C43 AMG
- 2004 MERCEDES BENZ C55
- 2007 MERCEDES BENZ C55
- 2006 to 2009 MERCEDES BENZ C63
- 2009 MERCEDES BENZ C63 AMG
- 2002 to 2006 MERCEDES BENZ CL215
- 2002 to 2007 MERCEDES BENZ CL500
- 2003 to 2007 MERCEDES BENZ CL55
- 2002 MERCEDES BENZ CL55 AMG
- 2007 to 2009 MERCEDES BENZ CL550
- 2002 to 2009 MERCEDES BENZ CL600
- 2007 to 2009 MERCEDES BENZ CL63
- 2004 to 2009 MERCEDES BENZ CL65
- 2002 to 2009 MERCEDES BENZ CLK320
- 2005 to 2009 MERCEDES BENZ CLK350
- 2002 to 2003 MERCEDES BENZ CLK430
- 2003 to 2009 MERCEDES BENZ CLK500
- 2005 to 2009 MERCEDES BENZ CLK55
- 2007 to 2009 MERCEDES BENZ CLK550
- 2007 MERCEDES BENZ CLK63
- 2003 to 2009 MERCEDES BENZ CLS500
- 2005 MERCEDES BENZ CLS55
- 2007 to 2009 MERCEDES BENZ CLS55
- 2003 to 2009 MERCEDES BENZ CLS550
- 2003 to 2006 MERCEDES BENZ CLS63
- 2002 MERCEDES BENZ E300
- 2002 to 2009 MERCEDES BENZ E320
- 2002 MERCEDES BENZ E430
- 2006 MERCEDES BENZ E450
- 2003 to 2009 MERCEDES BENZ E500
- 2007 MERCEDES BENZ E53
- 2002 MERCEDES BENZ E55
- 2007 to 2009 MERCEDES BENZ E55
- 2004 to 2009 MERCEDES BENZ E550
- 2005 to 2006 MERCEDES BENZ E63
- 2005 to 2009 MERCEDES BENZ GL320
- 2009 MERCEDES BENZ GL350
- 2005 to 2009 MERCEDES BENZ GL450
- 2005 to 2009 MERCEDES BENZ GL550
- 2025 to 2026 MERCEDES BENZ GLE 350
- 2026 MERCEDES BENZ GLE 450E 4MATIC
- 2026 MERCEDES BENZ GLE 580 4MATIC
- 2009 MERCEDES BENZ GLK350
- 2026 MERCEDES BENZ GLS 450 4MATIC
- 2026 MERCEDES BENZ GLS 580 4MATIC
- 2002 to 2003 MERCEDES BENZ ML320
- 2005 to 2009 MERCEDES BENZ ML320
- 2003 to 2009 MERCEDES BENZ ML350
- 2002 to 2009 MERCEDES BENZ ML500
- 2002 to 2003 MERCEDES BENZ ML55
- 2005 to 2009 MERCEDES BENZ ML550
- 2005 to 2009 MERCEDES BENZ ML63
- 2005 to 2009 MERCEDES BENZ R320
- 2005 to 2009 MERCEDES BENZ R500
- 2005 to 2009 MERCEDES BENZ R63
- 2005 to 2007 MERCEDES BENZ S350
- 2002 to 2007 MERCEDES BENZ S430
- 2002 to 2007 MERCEDES BENZ S500
- 2002 to 2007 MERCEDES BENZ S55
- 2005 to 2008 MERCEDES BENZ S550
- 2002 to 2009 MERCEDES BENZ S600
- 2007 to 2009 MERCEDES BENZ S63
- 2005 to 2009 MERCEDES BENZ S65
- 2003 to 2009 MERCEDES BENZ SL500
- 2003 MERCEDES BENZ SL500R
- 2003 to 2009 MERCEDES BENZ SL55
- 2007 to 2009 MERCEDES BENZ SL550
- 2003 to 2009 MERCEDES BENZ SL600
- 2007 to 2009 MERCEDES BENZ SL63 AMG
- 2003 to 2009 MERCEDES BENZ SL65
- 2004 to 2005 MERCEDES BENZ SLK230
- 2005 to 2009 MERCEDES BENZ SLK280
- 2009 MERCEDES BENZ SLK300
- 2004 MERCEDES BENZ SLK32
- 2002 to 2005 MERCEDES BENZ SLK320
- 2005 to 2009 MERCEDES BENZ SLK350
- 2005 to 2009 MERCEDES BENZ SLK55
- 2005 to 2007 MERCEDES BENZ SLR MCLAREN
- 2002 to 2003 MERCEDES BENZ W163
- 2019 to 2022 MERCEDES\-BENZ A 220
- 2020 to 2021 MERCEDES\-BENZ A 220 4MATIC
- 2020 to 2021 MERCEDES\-BENZ AMG A35
- 2020 MERCEDES\-BENZ AMG A35 4MATIC
- 2020 MERCEDES\-BENZ AMG A45
- 2002 to 2004 MERCEDES\-BENZ AMG C32
- 2016 to 2024 MERCEDES\-BENZ AMG C43
- 2023 to 2026 MERCEDES\-BENZ AMG C43 4MATIC
- 2005 to 2006 MERCEDES\-BENZ AMG C55
- 2010 to 2021 MERCEDES\-BENZ AMG C63
- 2019 to 2023 MERCEDES\-BENZ AMG C63 S
- 2023 to 2024 MERCEDES\-BENZ AMG C63 S E
- 2024 to 2025 MERCEDES\-BENZ AMG C63 S E 4MATIC\+
- 2026 MERCEDES\-BENZ AMG C63 S E PERFORMANCE 4MATIC\+
- 2015 to 2018 MERCEDES\-BENZ AMG C63S
- 2020 to 2024 MERCEDES\-BENZ AMG CLA35
- 2020 MERCEDES\-BENZ AMG CLA35 4MATIC
- 2026 MERCEDES\-BENZ AMG CLA35 4MATIC
- 2014 to 2024 MERCEDES\-BENZ AMG CLA45
- 2020 MERCEDES\-BENZ AMG CLA45 4MATIC
- 2026 MERCEDES\-BENZ AMG CLA45S 4MATIC\+
- 2024 MERCEDES\-BENZ AMG CLE53
- 2026 MERCEDES\-BENZ AMG CLE53 4MATIC CABRIOLET
- 2026 MERCEDES\-BENZ AMG CLE53 4MATIC COUPE
- 2024 to 2025 MERCEDES\-BENZ AMG CLE53 4MATIC\+
- 2025 MERCEDES\-BENZ AMG CLE53 4MATIC\+ CABRIOLET
- 2024 MERCEDES\-BENZ AMG CLE63E S
- 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
- 2025 MERCEDES\-BENZ AMG E 53 4MATIC\+ WAGON
- 2017 to 2018 MERCEDES\-BENZ AMG E43
- 2019 to 2023 MERCEDES\-BENZ AMG E53
- 2021 MERCEDES\-BENZ AMG E53 S
- 2023 MERCEDES\-BENZ AMG E53E
- 2003 to 2006 MERCEDES\-BENZ AMG E55
- 2003 to 2004 MERCEDES\-BENZ AMG E63
- 2007 to 2009 MERCEDES\-BENZ AMG E63
- 2018 to 2023 MERCEDES\-BENZ AMG E63
- 2023 MERCEDES\-BENZ AMG E63 S
- 2013 to 2015 MERCEDES\-BENZ AMG E63S
- 2018 to 2022 MERCEDES\-BENZ AMG E63S
- 2023 to 2025 MERCEDES\-BENZ AMG EQE
- 2023 to 2025 MERCEDES\-BENZ AMG EQE 4MATIC\+
- 2023 to 2025 MERCEDES\-BENZ AMG EQE 53 4MATIC
- 2024 to 2025 MERCEDES\-BENZ AMG EQE SUV 4MATIC
- 2024 to 2025 MERCEDES\-BENZ AMG EQE SUV 53 4MATIC
- 2022 to 2024 MERCEDES\-BENZ AMG EQS
- 2023 to 2025 MERCEDES\-BENZ AMG EQS 4MATIC\+
- 2022 to 2023 MERCEDES\-BENZ AMG EQS 53
- 2023 to 2024 MERCEDES\-BENZ AMG EQS 53 4MATIC
- 2003 to 2009 MERCEDES\-BENZ AMG G 55
- 2010 to 2011 MERCEDES\-BENZ AMG G55
- 2013 to 2025 MERCEDES\-BENZ AMG G63
- 2016 to 2018 MERCEDES\-BENZ AMG G65
- 2024 to 2025 MERCEDES\-BENZ AMG GLA 35
- 2024 MERCEDES\-BENZ AMG GLA 35 4MATIC
- 2026 MERCEDES\-BENZ AMG GLA 35 4MATIC
- 2024 MERCEDES\-BENZ AMG GLA 45S
- 2017 to 2018 MERCEDES\-BENZ AMG GLA35
- 2021 to 2023 MERCEDES\-BENZ AMG GLA35
- 2014 to 2023 MERCEDES\-BENZ AMG GLA45
- 2021 MERCEDES\-BENZ AMG GLA45 S
- 2020 to 2025 MERCEDES\-BENZ AMG GLB35
- 2026 MERCEDES\-BENZ AMG GLB35 4MATIC
- 2016 to 2024 MERCEDES\-BENZ AMG GLC43
- 2024 to 2026 MERCEDES\-BENZ AMG GLC43 4MATIC
- 2024 to 2025 MERCEDES\-BENZ AMG GLC43 4MATIC COUPE
- 2018 to 2022 MERCEDES\-BENZ AMG GLC63
- 2020 to 2023 MERCEDES\-BENZ AMG GLC63 S
- 2024 to 2025 MERCEDES\-BENZ AMG GLC63 S E
- 2025 to 2026 MERCEDES\-BENZ AMG GLC63 S E 4MATIC\+
- 2025 to 2026 MERCEDES\-BENZ AMG GLC63 S E 4MATIC\+ COUPE
- 2018 to 2019 MERCEDES\-BENZ AMG GLC63S
- 2016 to 2021 MERCEDES\-BENZ AMG GLE43
- 2021 to 2022 MERCEDES\-BENZ AMG GLE53
- 2023 to 2025 MERCEDES\-BENZ AMG GLE53 4MATIC\+
- 2025 MERCEDES\-BENZ AMG GLE53 4MATIC\+ COUPE
- 2021 to 2022 MERCEDES\-BENZ AMG GLE53 COUPE
- 2016 to 2024 MERCEDES\-BENZ AMG GLE63
- 2021 to 2022 MERCEDES\-BENZ AMG GLE63 S
- 2023 to 2024 MERCEDES\-BENZ AMG GLE63 S 4MATIC\+
- 2025 MERCEDES\-BENZ AMG GLE63 S 4MATIC\+ COUPE
- 2021 to 2022 MERCEDES\-BENZ AMG GLE63 S COUPE
- 2018 MERCEDES\-BENZ AMG GLE63S
- 2017 to 2022 MERCEDES\-BENZ AMG GLS63
- 2026 MERCEDES\-BENZ AMG GLS63
- 2023 to 2025 MERCEDES\-BENZ AMG GLS63 4MATIC\+
- 2023 MERCEDES\-BENZ AMG GLS63E
- 2016 to 2021 MERCEDES\-BENZ AMG GT
- 2023 MERCEDES\-BENZ AMG GT 63 S E COUPE
- 2018 to 2021 MERCEDES\-BENZ AMG GT C
- 2017 MERCEDES\-BENZ AMG GT C ROADSTER
- 2018 to 2020 MERCEDES\-BENZ AMG GT R
- 2018 MERCEDES\-BENZ AMG GT ROADSTER
- 2016 to 2020 MERCEDES\-BENZ AMG GT S
- 2020 to 2026 MERCEDES\-BENZ AMG GT43
- 2019 to 2023 MERCEDES\-BENZ AMG GT53
- 2024 MERCEDES\-BENZ AMG GT53E
- 2024 to 2025 MERCEDES\-BENZ AMG GT55

## Other bulletins for the same vehicles and component

- [LI82.10\-P\-078896](/bulletins/11017500.md), 2025-05-02, Service bulletin: EXTERIOR LIGHTING. 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. 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.
- [LI82.10\-P\-078301](/bulletins/11017496.md), 2025-05-02, Service bulletin: EXTERIOR LIGHTING. Complaint Headlamp, front fog lamp leaky or fogged Cause Fogging of the headlamps is a natural phenomenon, which can occur under certain climatic conditions. It does not lead to any technical impairment of the headlamp. Remedy NOTE: If a pressure compensation diaphragm is fitted in the housing cover, then the lamp unit is a "closed system". Headlamp: Remedy 1 Clearing fogged/condensed LED headlamps and LED rear lamps: 1. Drive vehicle into workshop \(temperature higher than \+18 °C/\+64.4 °F\) and connect the exhaust extraction. 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 \(thawing progress\). Clearing fogged/condensed halogen/xenon headlamps: 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. 3. Open the hood. 4. Switch off 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 \(thawing progress\). Note: If there is no visible reduction in the formation of condensation, check the headlamp for damage. \(See Remedy 2\) It is not physically possible to defog the headlamps completely. Fogging does not impair the operation or the service life of the headlamp. Remedy 2 A damaged headlamp can be identified as follows: 1. Check the headlamp for external damage and that the cover caps and the diaphragm are correctly seated. 2. Check the electrical connectors of the plugs and pins. 3. Check for leak tightness in accordance with LI82.10\-P\-078896 The test can only be conducted on headlamps. 4. If the headlamp or the rear lamp has any external damage, replace the component part in accordance with the WIS instructions.
- [LI82.10\-P\-078307](/bulletins/11007974.md), 2024-09-24, Service bulletin: EXTERIOR LIGHTING. 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 In advance, observe LI82.10\-P\-078301 "Headlamps or Front Fog Lamps Leaking or Fogged". 1. Prepare headlamp/check for external damage: 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: A headlamp with external damage is not a warranty or goodwill case. 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. • Seal all the outlet openings using sealing compound and the given diaphragm with the plunger \(picture 3\). \(Picture 4\) 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. • If a pressure drop of less than 10 mbar is measured within 30 seconds, the headlamp is not leaky and the problem is down to natural physical fogging. • If a pressure drop of more 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. Replace any leaky headlamps. Note: Desiccant packs can be installed for headlamps that are not leaky. See: • LI82.10\-P\-064766 Fogged headlamp, desiccant pack installed \- open ventilation system • LI82.10\-P\-078304 Fogged headlamp, desiccant pack installed \- closed ventilation system
- [LI82.10\-P\-078301](/bulletins/11007753.md), 2024-09-13, Service bulletin: EXTERIOR LIGHTING. Complaint Headlamp or front fog lamp leaky or fogged Cause Fogging of the headlamps is a natural phenomenon, which can occur under certain climatic conditions. It does not lead to any technical impairment of the headlamp. Headlamps comply with all applicable standards. If a pressure compensation diaphragm is fitted in the housing cover, then the lamp unit is a "closed system". Remedy Headlamp: Remedy 1 Clearing fogged/condensed LED headlamps and LED rear lamps: 1. Drive vehicle into workshop \(temperature higher than \+18 °C/\+64.4 °F\) and connect the exhaust extraction. 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 \(thawing progress\). Clearing fogged/condensed halogen/xenon headlamps: 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. 3. Open the hood. 4. Switch off 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 \(thawing progress\). Note: If there is no visible reduction in the formation of condensation, check the headlamp for a defect. \(See Remedy 2\) It is not physically possible to defog the headlamps completely. Fogging does not impair the operation or the service life of the headlamp. Remedy 2 A Damaged headlamp can be identified as follows: 1. Check the headlamp for external damage and that the cover caps and the diaphragm are correctly seated. 2. Check the electrical connectors of the plugs and pins. 3. Check for leak tightness in accordance with LI82.10\-P\-078307. The test can only be conducted on headlamps. 4. If the headlamp or the rear lamp has any external damage, replace the component part in accordance with the WIS instructions. Note: External damage to the headlamp/rear lamp or faulty seating of the cover caps does not present a warranty or goodwill case. With headlamps, it is possible to install desiccant packs if the problem occurs repeatedly. Open ventilation system: LI82.10\-P\-064766. Closed ventilation system LI82.10\-P\-078304
- [LI82.10\-P\-078069](/bulletins/11005294.md), 2024-07-27, Service bulletin: EXTERIOR LIGHTING. Complaint Rear lamps fogged up/not leaktight. Cause Fogging of the rear lamps is a natural phenomenon, which can occur under certain climatic conditions. This does not lead to any technical impairment of the rear lamps. Remedy Rear lamp: Remedy 1: Clearing fogged/condensed rear lamps: 1. Drive the vehicle into the workshop \(temperature higher than \+18 °C/\+64.4 °F\) Note: Do not wash the vehicle or subject it to high\-pressure cleaning before the defogging test. 2. Switch off the engine and connect battery support via a charger. 3. Open the trunk. 4. Switch on the exterior lighting. 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 \(defogging progress\).

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