# Service bulletin LI83.30\-P\-079850

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: 11027751
- Published by NHTSA: 2026\-01\-22
- Manufacturer's number: LI83.30\-P\-079850
- Manufacturer's date: 2026\-01\-16
- NHTSA component: VISIBILITY/WIPER

## NHTSA's summary

Complaint Customer states the AC either does not cool/has poor performance or heat is insufficient. Cause Many possible root causes Remedy \*Note \- This Li does not apply if there are other Li's that apply to your concern OR you have a fault and/or guided test that leads to a root cause. AC Diagnosis \(General\) Initial Steps Verify Customer Concern • Confirm the issue reported by the customer. Compare to Like Vehicle • Determine if the behavior is normal by comparing with a similar vehicle. Determine Your Game and Players • Identify the diagnostic strategy and involved components/systems. Testing • Perform relevant diagnostic tests. Refrigerant Quantity • Record the amount of refrigerant recovered and compare it to the specified value \(if applicable\). • Forming Gas is the ONLY approved leak test method. \(DYE is NOT approved\) TIPS Case Submission Requirements/Warranty Claim Submission Requirements \(Template attached to be used for submission of Warranty claim and/or TIPS case\) Cooling Capacity Test \(If System Has a Charge\) \*Note \- TIPS case is only required if the root cause is not identified or other Li's/documents require a case to be open. Before Repairs Gauge Readings • High and Low pressure readings \(from machine or separate gauges\). Leak Detection \(if applicable\) • PPM of any leaks found. XENTRY Printouts • Climate control AVs. • HV compressor AVs \(for heat and AC systems\). Thermometer Readings • Left and right dash vents. • Center vent, footwell, and/or rear vents \(if concern is localized\). Ambient Conditions • Temperature and humidity from OCP AVs \(if available\). After Repairs Gauge Readings • High and Low pressure readings before and after repairs. Thermometer Readings • Left and right dash vents before and after. • Center vent, footwell, and/or rear vents before and after \(if localized concern\). Documentation • Complaint Analysis, Game/Players, and Testing Steps. • Include expected results and technical justification for the diagnosis. • Avoid listing R/I steps—focus on diagnostic reasoning and root cause. • All prior measurements need to be documented on the repair order. OP code usage: 831232 \- Max .5 for Cooling Capacity Test 831040 \- Only to be utilized if you have a fault code and are actively diagnosing that fault code \(MAX 1 hour\) 831762 \- This includes basic leak check 831285 \- This can only be used in extenuating circumstances where a leak cannot be found \(MAX 1 hour\)

## The document

- [NHTSA's copy of the document (PDF)](https://static.nhtsa.gov/odi/tsbs/2026/MC-11027751-0001.pdf)
- [If that address does not open, try this one](https://static.nhtsa.gov/odi/tsbs/2026/MC-11027751-9999.pdf)

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

## Components

Glass, wipers and mirrors, Wipers and washers

## Vehicles listed

- 2018 MERCEDES BENZ C 300 4MATIC
- 2002 to 2009 MERCEDES BENZ G500
- 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
- 2016 to 2024 MERCEDES\-BENZ AMG C43
- 2023 to 2026 MERCEDES\-BENZ AMG C43 4MATIC
- 2016 to 2021 MERCEDES\-BENZ AMG C63
- 2019 to 2023 MERCEDES\-BENZ AMG C63 S
- 2024 MERCEDES\-BENZ AMG C63 S E
- 2024 to 2025 MERCEDES\-BENZ AMG C63 S E 4MATIC\+
- 2016 MERCEDES\-BENZ AMG C63S
- 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
- 2019 to 2021 MERCEDES\-BENZ AMG CLS53
- 2017 to 2018 MERCEDES\-BENZ AMG E43
- 2019 to 2023 MERCEDES\-BENZ AMG E53
- 2023 MERCEDES\-BENZ AMG E63 S
- 2018 to 2022 MERCEDES\-BENZ AMG E63S
- 2023 to 2025 MERCEDES\-BENZ AMG EQE
- 2023 to 2025 MERCEDES\-BENZ AMG EQE 4MATIC\+
- 2024 to 2025 MERCEDES\-BENZ AMG EQE SUV 4MATIC
- 2022 to 2024 MERCEDES\-BENZ AMG EQS
- 2023 to 2025 MERCEDES\-BENZ AMG EQS 4MATIC\+
- 2003 to 2009 MERCEDES\-BENZ AMG G 55
- 2010 to 2011 MERCEDES\-BENZ AMG G55
- 2013 to 2024 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
- 2021 to 2023 MERCEDES\-BENZ AMG GLA35
- 2020 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
- 2020 to 2024 MERCEDES\-BENZ AMG GLC43
- 2024 to 2026 MERCEDES\-BENZ AMG GLC43 4MATIC
- 2024 to 2025 MERCEDES\-BENZ AMG GLC43 4MATIC COUPE
- 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
- 2016 to 2019 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
- 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
- 2018 MERCEDES\-BENZ AMG GLE63S
- 2020 to 2022 MERCEDES\-BENZ AMG GLS63
- 2026 MERCEDES\-BENZ AMG GLS63
- 2023 to 2025 MERCEDES\-BENZ AMG GLS63 4MATIC\+
- 2017 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
- 2024 to 2026 MERCEDES\-BENZ AMG GT55 4MATIC\+
- 2019 to 2026 MERCEDES\-BENZ AMG GT63
- 2025 to 2026 MERCEDES\-BENZ AMG GT63 4MATIC\+
- 2026 MERCEDES\-BENZ AMG GT63 PRO 4MATIC\+
- 2022 to 2023 MERCEDES\-BENZ AMG GT63 S
- 2025 MERCEDES\-BENZ AMG GT63 S E
- 2024 MERCEDES\-BENZ AMG GT63 S E PERFORMANCE
- 2025 to 2026 MERCEDES\-BENZ AMG GT63 S E PERFORMANCE 4MATIC\+
- 2019 to 2021 MERCEDES\-BENZ AMG GT63S
- 2023 to 2025 MERCEDES\-BENZ AMG S 63 E 4MATIC\+
- 2015 to 2020 MERCEDES\-BENZ AMG S63
- 2015 to 2020 MERCEDES\-BENZ AMG S65
- 2022 to 2026 MERCEDES\-BENZ AMG SL43
- 2022 to 2025 MERCEDES\-BENZ AMG SL55
- 2023 to 2026 MERCEDES\-BENZ AMG SL55 4MATIC\+
- 2020 MERCEDES\-BENZ AMG SL63
- 2022 to 2023 MERCEDES\-BENZ AMG SL63
- 2025 MERCEDES\-BENZ AMG SL63
- 2023 to 2026 MERCEDES\-BENZ AMG SL63 4MATIC\+
- 2024 to 2025 MERCEDES\-BENZ AMG SL63 S E
- 2024 to 2026 MERCEDES\-BENZ AMG SL63 S E PERFORMANCE 4MATIC\+
- 2011 to 2012 MERCEDES\-BENZ AMG SLS
- 2014 to 2017 MERCEDES\-BENZ B 250E
- 2017 to 2019 MERCEDES\-BENZ C 300
- 2022 to 2026 MERCEDES\-BENZ C 300
- 2022 to 2026 MERCEDES\-BENZ C 300 4MATIC
- 2018 to 2019 MERCEDES\-BENZ C 350 E
- 2015 to 2016 MERCEDES\-BENZ C300
- 2016 to 2017 MERCEDES\-BENZ C350E
- 2015 MERCEDES\-BENZ C400
- 2016 to 2017 MERCEDES\-BENZ C450
- 2018 to 2026 MERCEDES\-BENZ CLA 250
- 2020 to 2021 MERCEDES\-BENZ CLA 250 4MATIC
- 2026 MERCEDES\-BENZ CLA 250 4MATIC
- 2026 MERCEDES\-BENZ CLA 250\+ \(EV\)
- 2026 MERCEDES\-BENZ CLA 350 4MATIC \(EV\)
- 2014 to 2017 MERCEDES\-BENZ CLA250
- 2023 MERCEDES\-BENZ CLE 300
- 2024 MERCEDES\-BENZ CLE 300
- 2024 to 2025 MERCEDES\-BENZ CLE 300 4MATIC
- 2024 to 2026 MERCEDES\-BENZ CLE 300 4MATIC CABRIOLET
- 2026 MERCEDES\-BENZ CLE 300 4MATIC COUPE
- 2023 MERCEDES\-BENZ CLE 450
- 2024 MERCEDES\-BENZ CLE 450
- 2024 to 2025 MERCEDES\-BENZ CLE 450 4MATIC
- 2024 to 2026 MERCEDES\-BENZ CLE 450 4MATIC CABRIOLET
- 2026 MERCEDES\-BENZ CLE 450 4MATIC COUPE
- 2019 to 2023 MERCEDES\-BENZ CLS 450
- 2018 to 2019 MERCEDES\-BENZ E 300
- 2020 to 2026 MERCEDES\-BENZ E 350
- 2024 to 2026 MERCEDES\-BENZ E 350 4MATIC
- 2018 MERCEDES\-BENZ E 400
- 2019 to 2024 MERCEDES\-BENZ E 450
- 2024 to 2026 MERCEDES\-BENZ E 450 4MATIC
- 2024 to 2026 MERCEDES\-BENZ E 450 4MATIC ALL\-TERRAIN
- 2017 MERCEDES\-BENZ E300
- 2017 MERCEDES\-BENZ E400
- 2025 MERCEDES\-BENZ E53 E 4MATIC\+
- 2026 MERCEDES\-BENZ E53 E 4MATIC\+ ALL\-TERRAIN
- 2023 to 2025 MERCEDES\-BENZ EQB 250\+
- 2022 to 2025 MERCEDES\-BENZ EQB 300 4MATIC
- 2022 to 2025 MERCEDES\-BENZ EQB 350 4MATIC
- 2023 to 2025 MERCEDES\-BENZ EQE 350 4MATIC
- 2023 to 2025 MERCEDES\-BENZ EQE 350\+
- 2023 to 2025 MERCEDES\-BENZ EQE 500
- 2023 to 2025 MERCEDES\-BENZ EQE 500 4MATIC
- 2023 to 2025 MERCEDES\-BENZ EQE SUV 350 4MATIC
- 2023 to 2025 MERCEDES\-BENZ EQE SUV 350\+
- 2023 to 2025 MERCEDES\-BENZ EQE SUV 500 4MATIC
- 2022 MERCEDES\-BENZ EQS 450
- 2023 to 2025 MERCEDES\-BENZ EQS 450 4MATIC
- 2022 to 2025 MERCEDES\-BENZ EQS 450\+
- 2022 to 2024 MERCEDES\-BENZ EQS 580
- 2022 to 2025 MERCEDES\-BENZ EQS 580 4MATIC
- 2023 to 2025 MERCEDES\-BENZ EQS SUV 450 4MATIC
- 2023 to 2025 MERCEDES\-BENZ EQS SUV 450\+
- 2023 to 2025 MERCEDES\-BENZ EQS SUV 580 4MATIC
- 2025 MERCEDES\-BENZ G 550
- 2025 MERCEDES\-BENZ G 580 EV
- 2010 MERCEDES\-BENZ G500
- 2020 to 2026 MERCEDES\-BENZ GLA 250
- 2021 MERCEDES\-BENZ GLA 250 4MATIC
- 2024 MERCEDES\-BENZ GLA 250 4MATIC
- 2026 MERCEDES\-BENZ GLA 250 4MATIC
- 2020 to 2026 MERCEDES\-BENZ GLB 250
- 2020 to 2021 MERCEDES\-BENZ GLB 250 4MATIC
- 2026 MERCEDES\-BENZ GLB 250 4MATIC
- 2020 to 2026 MERCEDES\-BENZ GLC 300
- 2023 to 2026 MERCEDES\-BENZ GLC 300 4MATIC
- 2024 to 2026 MERCEDES\-BENZ GLC 300 4MATIC COUPE
- 2024 MERCEDES\-BENZ GLC 300 COUPE
- 2025 to 2026 MERCEDES\-BENZ GLC 350 E 4MATIC
- 2026 MERCEDES\-BENZ GLC43 4MATIC COUPE
- 2020 to 2024 MERCEDES\-BENZ GLE 350
- 2024 to 2026 MERCEDES\-BENZ GLE 350 4MATIC
- 2020 to 2024 MERCEDES\-BENZ GLE 450
- 2025 to 2026 MERCEDES\-BENZ GLE 450 4MATIC
- 2025 MERCEDES\-BENZ GLE 450 4MATIC COUPE
- 2024 to 2025 MERCEDES\-BENZ GLE 450E 4MATIC
- 2020 to 2021 MERCEDES\-BENZ GLE 580
- 2022 to 2024 MERCEDES\-BENZ GLE 580 4MATIC
- 2016 to 2017 MERCEDES\-BENZ GLE450
- 2016 to 2017 MERCEDES\-BENZ GLE63S
- 2020 MERCEDES\-BENZ GLS 450
- 2022 to 2025 MERCEDES\-BENZ GLS 450 4MATIC
- 2020 MERCEDES\-BENZ GLS 580 4MATIC
- 2022 to 2025 MERCEDES\-BENZ GLS 580 4MATIC
- 2023 MERCEDES\-BENZ GLS 600
- 2021 MERCEDES\-BENZ GLS450
- 2021 MERCEDES\-BENZ GLS580
- 2018 to 2020 MERCEDES\-BENZ S 450
- 2021 MERCEDES\-BENZ S 500
- 2023 MERCEDES\-BENZ S 500
- 2022 to 2025 MERCEDES\-BENZ S 500 4MATIC
- 2021 MERCEDES\-BENZ S 560
- 2019 to 2020 MERCEDES\-BENZ S 560 E
- 2021 MERCEDES\-BENZ S 580
- 2023 MERCEDES\-BENZ S 580
- 2022 to 2025 MERCEDES\-BENZ S 580 4MATIC
- 2023 MERCEDES\-BENZ S 580 E
- 2023 to 2025 MERCEDES\-BENZ S 580 E 4MATIC
- 2015 to 2017 MERCEDES\-BENZ S550
- 2016 to 2017 MERCEDES\-BENZ S550 4MATIC

## Other bulletins for the same vehicles and component

- [LI82.30\-P\-059239](/bulletins/11032875.md), 2026-05-20, Service bulletin: VISIBILITY/WIPER. Complaint There are several types of complaint about noises or poor windshield wiper wiping performance: A: Wiper blades squeaking, chattering, shuddering B: The windshield is not wiped completely \(streaking\) C: During the downward movement water is pulled back onto the windshield from the A\-pillar \(Figure 1\) D: After windshield cleaning, water keeps spraying onto the windshield for several wipe cycles \(Figure 2\) A1: The windshield and wiper blades are contaminated with residues from car washing facilities, identifiable by the water beading. The resulting differences in the friction values between the wiper blades and the windshield can excite the wiper blades to vibrate. Note: It is mostly wax residue from the washer system, but also water\-repellent nano\-particle coating for paint and/or silicone\-based washer fluid, that could cause this problem. A partially dry windshield also has different friction values, which can likewise result in squeaking of the wiper blades A2: The wiper blades are worn by mechanical damage \(wiper lip damaged by ice or insect debris, or deformed by long periods of disuse\). A3: Incorrect angle of incidence of the wiper arms to the windshield. Because of this, the rubber lip of the wiper blade may not flip over at the reversal point. Cause B: B1: Wax/ dirt residues on the windshield B2: Wiper blades deformed or worn B3: Downforce of wiper arm not OK \(Figure 3\) Cause C: Water is pulled back onto the windshield by the differential pressure created as the wiper arm moves downwards. Cause D: Washer water collects in the fastening of the wiper blade and is blown onto the windshield by the airstream over several wipe cycles. Note and supporting information: Wiper blades are wear parts which, even when "not used" for long periods \(kept in park position\), may become permanently deformed and damaged. Further stresses on the rubber wiper blade arise due to various environmental influences which progressively change the effectiveness of the rubber wiper blade and accelerate the aging process. Due to the natural aging process and wear, the wiper blades should be replaced twice a year, preferably in Spring and Fall \(see operator's manual\). Remedy Remedy A: A1: Cleaning entire windshield with A 000 986 40 71. A2: Checking water's flow behavior after windshield has been cleaned \(see Video 1\). If, after cleaning, there are still areas with water beading, then the cleaning process must be carried out again until a rejection reaction is no longer present. • Note: On the vehicle in the video \(Video 1\), water still beads on the bottom left of the windshield. The windshield is still not properly clean, even though it appears to be clean. The windshield is only properly clean when there are no more areas on the windshield where water beads. A3: Replace wiper blades with genuine wiper blades. Important: Only exchange wiper blades if windshield no longer has water\-repellent areas Note: Replacement of wiper blades is not covered under warranty and can be replaced at the expense of the customer. Remedy B: B1: Clean windshield with intensive cleaner A 000 986 40 71. Important: Do not clean the wiper blades otherwise the graphite coating will be damaged. B2: Replace wiper blades with genuine wiper blades • Note: Replacement of wiper blades is not covered under warranty and can be replaced at the expense of the customer. B3: Check the wiper arm for excessive resistance in the bearing. Restore mobility or replace wiper arm if necessary. Remedy C: Problem inherent in design for which there is no technical remedy. Exception: X204 up to 02/2014. In these vehicles, it is possible to install the design configuration of vehicles as of 02/2014. This includes wiper arms \(styled arms\) with improved behavior in this respect. It is also necessary to replace the wiper blades because the styled arms feature a Top Lock connection \(previously Side Lock\).
- [LI83.30\-P\-079850](/bulletins/11027682.md), 2026-01-16, Service bulletin: VISIBILITY/WIPER. Complaint Customer states the AC either does not cool/has poor performance or heat is insufficient. Cause Many possible root causes Remedy AC Diagnosis \(General\) Initial Steps Verify Customer Concern • Confirm the issue reported by the customer. Compare to Like Vehicle • Determine if the behavior is normal by comparing with a similar vehicle. Determine Your Game and Players • Identify the diagnostic strategy and involved components/systems. Testing • Perform relevant diagnostic tests. Refrigerant Quantity • Record the amount of refrigerant recovered and compare it to the specified value \(if applicable\). • Forming Gas is the ONLY approved leak test method. \(DYE is NOT approved\) TIPS Case Submission Requirements/Warranty Claim Submission Requirements Cooling Capacity Test \(If System Has a Charge\) \*Note \- TIPS case is only required if the root cause is not identified or other Li's/documents require a case to be open. Before Repairs Gauge Readings • High and Low pressure readings \(from machine or separate gauges\). Leak Detection \(if applicable\) • PPM of any leaks found. XENTRY Printouts • Climate control AVs. • HV compressor AVs \(for heat and AC systems\). Thermometer Readings • Left and right dash vents. • Center vent, footwell, and/or rear vents \(if concern is localized\). Ambient Conditions • Temperature and humidity from OCP AVs \(if available\). After Repairs Gauge Readings • High and Low pressure readings before and after repairs. Thermometer Readings • Left and right dash vents before and after. • Center vent, footwell, and/or rear vents before and after \(if localized concern\). Documentation • Complaint Analysis, Game/Players, and Testing Steps. • Include expected results and technical justification for the diagnosis. • Avoid listing R/I steps—focus on diagnostic reasoning and root cause. • All prior measurements need to be documented on the repair order. OP code usage: 831232 \- Max .5 for Cooling Capacity Test 831040 \- Only to be utilized if you have a fault code and are actively diagnosing that fault code \(MAX 1 hour\) 831762 \- This includes basic leak check 831285 \- This can only be used in extenuating circumstances where a leak cannot be found \(MAX 1 hour\)
- [LI83.30\-P\-079850](/bulletins/11027566.md), 2026-01-09, Service bulletin: VISIBILITY/WIPER. Complaint Customer states the AC either does not cool/has poor performance or heat is insufficient. Cause Many possible root causes Remedy AC Diagnosis \(General\) Initial Steps Verify Customer Concern • Confirm the issue reported by the customer. Compare to Like Vehicle • Determine if the behavior is normal by comparing with a similar vehicle. Determine Your Game and Players • Identify the diagnostic strategy and involved components/systems. Testing • Perform relevant diagnostic tests. Refrigerant Quantity • Record the amount of refrigerant recovered and compare it to the specified value \(if applicable\). • Forming Gas is the ONLY approved leak test method. \(DYE is NOT approved\) TIPS Case Submission Requirements Cooling Capacity Test \(If System Has a Charge\) Before Repairs Gauge Readings • High and Low pressure readings \(from machine or separate gauges\). Leak Detection \(if applicable\) • PPM of any leaks found. XENTRY Printouts • Climate control AVs. • HV compressor AVs \(for heat and AC systems\). Thermometer Readings • Left and right dash vents. • Center vent, footwell, and/or rear vents \(if concern is localized\). Ambient Conditions • Temperature and humidity from OCP AVs \(if available\). After Repairs \- Warranty Submission Requirements on the Repair Order Gauge Readings • High and Low pressure readings before and after repairs. Thermometer Readings • Left and right dash vents before and after. • Center vent, footwell, and/or rear vents before and after \(if localized concern\). Documentation • Complaint Analysis, Game/Players, and Testing Steps. • Include expected results and technical justification for the diagnosis. • Avoid listing R/I steps—focus on diagnostic reasoning and root cause. • All prior measurements need to be documented on the repair order. OP code usage: 831232 \- Max .5 for Cooling Capacity Test 831040 \- Only to be utilized if you have a fault code and are actively diagnosing that fault code 831762 \- This includes basic leak check 831285 \- This can only be used in extenuating circumstances where a leak cannot be found
- [LI82.10\-P\-078069](/bulletins/11010494.md), 2024-11-13, Service bulletin: EXTERIOR LIGHTING; VISIBILITY/WIPER. 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 \(defogging progress\). Note: \-If no reduction in the degree of fogging is visible, the rear lamp is defective and must be replaced. \-It is not physically possible to defog the headlamps completely – some residual fogging may remain. Fogging does not impair the functionality or the service life of the rear lamps. \-Simultaneous fogging of multiple component parts indicates extreme climatic conditions and also does not impair the functionality or the service life of the rear lamps. Remedy 2: You can recognize a defective rear lamp as follows: 1. Check the rear lamps to ensure that no external damage is present, and that the differential aeration cells and the diaphragm are present and correctly seated. \-\> If there are signs of external damage on the rear lamp, the component parts must be replaced as per WIS instructions. 2. Check the electrical connectors of the plugs and pins. \-\> If moisture/corrosion/etc. is present, the component part must be replaced as per WIS instructions. 3. Check for leak tightness \-\> Close all openings with Terostat IX or similar and establish and stabilize via an overpressure \(40–50 mbar\) via the plug. \-\> In the event of a sudden pressure drop, the component part must be replaced as per WIS instructions. Note: External damage to the rear lamps does not constitute a warranty or goodwill case.
- [LI82.35\-P\-078467](/bulletins/11009122.md), 2024-10-25, Service bulletin: VISIBILITY/WIPER; STRUCTURE:BODY. Complaint Washer fluid system leaks Cause Various possible causes: 1. Washer fluid reservoir itself. 2. Seal on washer fluid pump/washer fluid reservoir. 3. Washer fluid pump. 3.1. Distributor housing leaks. 3.2. Pump fitting leaks. 3.3. Washer fluid hose cannot be snapped into place on pump fitting. 3.4. Washer fluid hose will not stay on pump fitting, although connector OK. 4. Washer fluid line. 4.1 Connector will not stay on pump fitting because it is broken. 4.2 Sealing ring in connector missing. 4.3 Sealing ring in connector fitted, but deformed and therefore leaks. 4.4 Damage to washer line by animal. 5. Seal on heating washer fluid reservoir/washer fluid reservoir. Remedy Replace defective component parts only. Do not replace any adjacent component parts that are intact. Note: Repair kits for washer line hoses do exist to allow patches for line damage.

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