Sunroof May Close Unexpectedly – 2020 Mercedes-Benz GLS

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Recall Campaign Launch Notification
DATE: December 1, 2023

Mercedes-Benz USA, LLC A Mercedes-Benz Group AG Com pany
One Mercedes-Benz Drive Sandy Springs, GA 30328 770.705.0600
News Channel Update | Vehicle Compliance & Analysis
IMPORTANT RECALL CAMPAIGN UPDATE
Please see the attached documents related to the campaign listed above.
Please note that all customer inquiries should be directed to the Customer Assistance Center at 1-800-FORMERCEDES.
Sincerely,
Gregory Gunther
Senior Manager, Vehicle Compliance & Analysis
TO: Mercedes-Benz Dealer Principals, General Managers,
Sales Managers, Service Managers, Parts Managers
FROM: Gregory Gunther, Senior Manager, Vehicle
Compliance and Analysis, Engineering Services
RE: Recall Campaign Launch Notification
Update the Sunroof Control Unit Software
MY20 GLS (167 platform)
DATE: December 1, 2023
Mercedes-Benz USA, LLC A Mercedes-Benz Group AG Com pany
One Mercedes-Benz Drive Sandy Springs, GA 30328 770.705.0600
News Channel Update | Vehicle Compliance & Analysis
Recall Campaign Launch Notification December 1, 2023
Campaign No. : NHTSA ID Campaign Desc. : Update the Sunroof Control Unit
2023110007 23V733 23P7891011 Software
This is to notify you of the Recall Campaign Launch to update the sunroof control unit software on 8 Model Year 2020 GLS (167 platform)
vehicles. The recall campaign will be visible on the www.NHTSA.gov website and may generate questions from customers. Affected VINs will be
flagged in VMI as “OPEN” on December 1, 2023.
Background
Issue
Mercedes-Benz AG (“MBAG”), the manufacturer of Mercedes-Benz vehicles, has determined that
on certain Model Year 2020 GLS (167 platform) vehicles, the sunroof control unit software might
not meet current production specifications. In this case, the sunroof might automatically close
when the vehicle’s “car-wash-mode” is activated. The car-wash-mode is activated via the central
touch display or the touchpad in the center console. Although anti-pinch protection is in place,
using the actuation device test procedure in FMVSS 118, S6(a)(1) might allow the sunroof to
automatically close, which is contrary to the requirements of the regulation. The unintended autoclosure
of the sunroof might pose a risk of injury.
What We’re Doing MBUSA will conduct a voluntary recall. An authorized Mercedes-Benz dealer will update the
sunroof control unit software on the affected vehicles.
Parts The remedy is available and can be performed.
Vehicles Affected
Vehicle Model Year(s) 2020
Vehicle Model GLS
Vehicle Populations
Total Recall Population 8
Total Vehicles in Dealer Inventory 0
Given this notice, it is a violation of Federal law for a dealer to sell or lease any new vehicles in dealer inventory covered by this
notification until the vehicle has been repaired. Once the remedy is available, the vehicles will be flagged as “OPEN” and Work
Instructions will be available in NetStar VMI and Xentry Portal. Once the repair is complete, the vehicle may be sold or leased.
Loaner and demonstrator vehicles may continue to be driven, but must not be retailed until repaired. As a matter of normal service
process, please check for other repair measures which might be applicable to the vehicle(s).
Additionally, given this notice, it is a violation of Federal Law for car rental companies to rent new vehicles covered by this
notification until the vehicle has been repaired.
Next Steps/Notes
Customer Notification Timeline Customer letters will be mailed on December 15, 2023.
AOMS/SOMS AOMs – This recall may generate questions from your dealers. Please forward this notice to
your dealers ASAP.
Rental Fleet Partners This recall may affect vehicles in your fleet. Please contact your respective MBUSA fleet
representative for further information and next steps. For repairs, please contact your
preferred MBUSA dealer.
Customer Reimbursement Customer reimbursement is not being offered for this campaign.
While we regret any inconvenience this may cause, MBUSA is determined to maintain a high level of vehicle quality and customer satisfaction.
Please refer all customer inquiries to the Customer Assistance Center at 1-800-FOR-MERCEDES.
2
Campaign No. 2023110007, December 2023
TO: ALL MERCEDES-BENZ CENTERS
SUBJECT: Model GLS (167 platform)
Model Year 2020
Update the Sunroof Control Unit Software
Mercedes-Benz AG (“MBAG”), the manufacturer of Mercedes-Benz vehicles, has determined that on certain Model Year 2020 GLS (167 platform) vehicles, the sunroof control unit software might not meet current production specifications. In this case, the sunroof might automatically close when the vehicle’s “car-wash-mode” is activated. The car-wash-mode is activated via the central touch display or the touchpad in the center console. Although anti-pinch protection is in place, using the actuation device test procedure in FMVSS 118, S6(a)(1) might allow the sunroof to automatically close, which is contrary to the requirements of the regulation. The unintended auto-closure of the sunroof might pose a risk of injury. An authorized Mercedes-Benz dealer will update the sunroof control unit software on the affected vehicles.
Prior to performing this Campaign:
• VMI must be checked before performing campaigns to verify that the campaign is required on a specific vehicle. Always check for any other open campaigns and perform accordingly.
• Please review the entire Campaign bulletin and follow the repair procedure exactly as described.
Approximately 8 vehicles are affected.
Order No. P-RC-2023110007
2
P-RC-2023110007
Update the Sunroof Control Unit Software
• Always use the latest XENTRY Diagnosis software release with all available add-ons.
• Make sure to follow the operation steps exactly as described in XENTRY Diagnosis!
• Use a battery charger to ensure sufficient power supply of the vehicle on-board electrical system battery (greater than 12.5 V).
• If XENTRY Diagnosis is already connected to the vehicle, start with Work Procedure – step 2. If two or more software updates or SCN coding is performed during one workshop
visit, the operation items 02-4762 and 02-5058 may only be invoiced
once for each workshop order.
Work Procedure
1. Connect XENTRY Diagnosis.
2. Perform SCN coding in panoramic sliding sunroof control unit. To do this, select menu item “Quick test view – A98 ‘Panoramic sliding sunroof’ (PSD) control module – Adaptations – Control unit update – Update of SCN coding”. Then follow the user guidance in XENTRY Diagnosis.
3. Disconnect XENTRY Diagnosis.
Note: The following allowable labor operation should be used when submitting a warranty claim for this repair:
Warranty Information
Damage Code Operation Number Description Labor Time (hrs.)
78 910 11
02-9446
Perform SCN coding in
panoramic sliding sunroof control unit
(with XENTRY Diagnosis connected)
0.1
02-4762*
Connect/disconnect diagnostic system
(XENTRY Diagnosis)
0.1
02-5058*
Connect/disconnect starter battery charger
(with XENTRY Diagnosis connected)
0.1
* Invoice operation item only once for each workshop order.
Note: Always check Xentry Operation Time (XOT) for the current OP-Code times. Labor times are subject to change and updates may not be reflected in this document.

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Recall Campaign Initial Notification
DATE: November 8, 2023

Mercedes-Benz USA, LLC A Mercedes-Benz Group AG Com pany
One Mercedes-Benz Drive Sandy Springs, GA 30328 770.705.0600
News Channel Update | Vehicle Compliance & Analysis
IMPORTANT RECALL CAMPAIGN INFORMATION
Please see the attached documents related to the campaign listed above.
Please note that all customer inquiries should be directed to the Customer Assistance Center at 1-800-FOR-MERCEDES.
Sincerely,
Gregory Gunther
Senior Manager, Vehicle Compliance & Analysis
TO: Mercedes-Benz Dealer Principals, General Managers, Sales Managers, Service Managers, Parts Managers
FROM: Gregory Gunther, Senior Manager, Vehicle Compliance and Analysis, Engineering Services
RE: Recall Campaign Initial Notification
Update the Sunroof Control Unit Software
MY20 GLS (167 platform)
DATE: November 8, 2023
Mercedes-Benz USA, LLC A Mercedes-Benz Group AG Com pany
One Mercedes-Benz Drive Sandy Springs, GA 30328 770.705.0600
News Channel Update | Vehicle Compliance & Analysis
Recall Campaign Initial Notification
November 8, 2023
Campaign No. :
NHTSA ID
Campaign Desc. :
Update the Sunroof Control Unit Software
TBA
23V733
23P2197644
This is to notify you of the new Recall Campaign to update the sunroof control unit software on 8 Model Year (“MY”) 2020 GLS (167 platform) vehicles. The recall campaign will be visible on the www.NHTSA.gov website and may generate questions from customers. Affected VINs will be flagged in VMI as “PENDING” on November 8, 2023.
Background
Issue
Mercedes-Benz AG (“MBAG”), the manufacturer of Mercedes-Benz vehicles, has determined that on certain Model Year 2020 GLS (167 platform) vehicles, the sunroof control unit software might not meet current production specifications. In this case, the sunroof might automatically close when the vehicle’s “car-wash-mode” is activated. The car-wash-mode is activated via the central touch display or the touchpad in the center console. Although anti-pinch protection is in place, using the actuation device test procedure in FMVSS 118, S6(a)(1) might allow the sunroof to automatically close, which is contrary to the requirements of the regulation. The unintended auto-closure of the sunroof might pose a risk of injury.
What We’re Doing
MBUSA will conduct a voluntary recall. An authorized Mercedes-Benz dealer will update the sunroof control unit software on the affected vehicles.
Parts
Remedy is not available at this time.
Vehicles Affected
Vehicle Model Year(s)
2020
Vehicle Model
GLS
Vehicle Populations
Total Recall Population
8
Total Vehicles in Dealer Inventory
0
Given this notice, it is a violation of Federal law for a dealer to sell or lease any new vehicles in dealer inventory covered by this notification until the vehicle has been repaired. Once the remedy is available, the vehicles will be flagged as “OPEN” and Work Instructions will be available in NetStar VMI and Xentry Portal. Once the repair is complete, the vehicle may be sold or leased.
Loaner and demonstrator vehicles may continue to be driven, but must not be retailed until repaired. As a matter of normal service process, please check for other repair measures which might be applicable to the vehicle(s).
Additionally, given this notice, it is a violation of Federal Law for car rental companies to rent new vehicles covered by this notification until the vehicle has been repaired.
Next Steps/Notes
Customer Notification Timeline
Customer letters will be mailed on or before December 31, 2023.
AOMS/SOMS
AOMs – This recall may generate questions from your dealers. Please forward this notice to your dealers ASAP.
Rental Fleet Partners
This recall may affect vehicles in your fleet. Please contact your respective MBUSA fleet representative for further information and next steps. For repairs, please contact your preferred MBUSA dealer.
Customer Reimbursement
Customer reimbursement is not being offered for this campaign.
While we regret any inconvenience this may cause, MBUSA is determined to maintain a high level of vehicle quality and customer satisfaction. Please refer all customer inquiries to the Customer Assistance Center at 1-800-FOR-MERCEDES.

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OMB Control No.: 2127-0004
Part 573 Safety Recall Report 23V-733
The information contained in this report was submitted pursuant to 49 CFR §573
Manufacturer Name : Mercedes-Benz USA, LLC
Submission Date : DEC 01, 2023
NHTSA Recall No. : 23V-733
Manufacturer Recall No. : 2023110007
Manufacturer Information :
Manufacturer Name : Mercedes-Benz USA, LLC
Address : 13470 International Parkway
Jacksonville FL 32218
Company phone : 1-877-496-3691
Population :
Number of potentially involved : 8
Estimated percentage with defect : 100 %
Vehicle Information :
Vehicle 1 : 2020-2020 Mercedes-Benz GLS580
Vehicle Type : LIGHT VEHICLES
Body Style : SUV
Power Train : GAS
Descriptive Information : Mercedes-Benz 2020 GLS 8 Vehicles
The recall population was determined through production records.
Vehicles outside of the recall population have a sunroof control unit equipped with
software that conforms to the standards set forth in FMVSS 118, S6(a)(1).
Production Dates : FEB 08, 2019 – SEP 20, 2019
VIN Range 1 : Begin : NR End : NR Not sequential
Description of Noncompliance :
Description of the
Noncompliance :
Mercedes-Benz AG (“MBAG”), the manufacturer of Mercedes-Benz vehicles, has
determined that on certain Model Year 2020 GLS (167 platform) vehicles, the
sunroof control unit software might not meet current production
specifications. In this case, the sunroof might automatically close when the
vehicle’s “car-wash-mode” is activated.
FMVSS 1 : 118 – Power-operated window systems
FMVSS 2 : NR
Description of the Safety Risk : The car-wash-mode is activated via the central touch display or the touchpad
in the center console.
Although anti-pinch protection is in place, using the actuation device test
procedure in FMVSS 118, S6(a)(1) might allow the sunroof to automatically
close, which is contrary to the requirements of the regulation.
The unintended auto-closure of the sunroof might pose a risk of injury
Description of the Cause : Due to a deviation in the development process, the affected vehicles are
Part 573 Safety Recall Report 23V-733 Page 2
The information contained in this report was submitted pursuant to 49 CFR §573
equipped with a sunroof control unit software version that includes an
automatic closing function of the sunroof when the car-wash-mode is activated.
Identification of Any Warning
that can Occur :
The driver will not receive a warning due to the nature of the failure
mechanism.
Involved Components :
Component Name 1 : SOFTWARE ASHD
Component Description : SOFTWARE ASHD
Component Part Number : A1679020606
Supplier Identification :
Component Manufacturer
Name : Mercedes-Benz AG
Address : NR
Foreign States
Country : Germany
Chronology :
In May, 2019, MBAG found that there was a deviation in the software-development process which allowed the
sunroof to be closed automatically through operation of the car wash mode via touchpad. This operation was
inconsistent with the design intent. A plant action was initiated to reflash the software.
In June, 2019, it was determined that certain vehicles may have been released from the plant without the
software reflash. Therefore initial investigations were launched immediately to identify the affected vehicle
population and where these vehicles are located. Through summer and early autumn, MBAG conducted a
review of the circumstances under which the sunroof could be closed and determined that there was no safety
risk due to the automatic reverse feature and because multiple steps were required to initiate the car wash
mode so there was no risk of the sunroof closing inadvertently.
Subsequently, in November, 2019, the question was raised whether the ability to close the sunroof in the car
wash mode was consistent with the circumstances under which the sunroof could be operated.
A review of legal and regulatory provisions ensued into 2020, and on May 4, 2020, MBAG determined that the
operation of sunroof as a consequence of the activation of the car wash mode via the central touch display or
the touchpad of the center console might be considered a noncompliance.
MBAG therefore decided to report a noncompliance with a request for inconsequential treatment.
Some of the affected vehicles could have been resolved while still in access at the dealerships in advance of
customer delivery.
On October 25, 2023, NHTSA published its denial of MBAG’s petition for inconsequentiality in the Federal
Part 573 Safety Recall Report 23V-733 Page 3
The information contained in this report was submitted pursuant to 49 CFR §573
Register.
In accordance with that denial, MBAG determined on October 27, 2023 to conduct a recall.
MBAG confirms there are no warranty claims, field or service reports, and other information (such as the
numbers of deaths and/or injuries) related to this defect in the USA.
Description of Remedy :
Description of Remedy Program : An authorized Mercedes-Benz dealer will update the sunroof control unit
software on the affected vehicles.
Pursuant to 49 C.F.R. § 577.11(e), MBUSA does not plan to provide notice
about pre-notice reimbursement to owners since none of the involved
vehicles would have been previously subject to the condition described
and all remain covered under the new vehicle warranty
How Remedy Component Differs
from Recalled Component :
Sunroof control unit software according to specification. SOFTWARE ASHD
A1679020606
Identify How/When Recall Condition
was Corrected in Production :
A change of the development process ensures that this issue can no longer
occur from September 23, 2019 onwards.
Recall Schedule :
Description of Recall Schedule : Dealers will be notified of the pending voluntary recall campaign on
November 8, 2023. Owners will be notified of the voluntary recall
campaign on December 15, 2023.
A copy of all communications will be provided when available.
Planned Dealer Notification Date : NOV 08, 2023 – NR
Planned Owner Notification Date : DEC 15, 2023 – NR
* NR – Not Reported

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OMB Control No.: 2127-0004
Part 573 Safety Recall Report 23V-733
The information contained in this report was submitted pursuant to 49 CFR §573
Manufacturer Name : Mercedes-Benz USA, LLC
Submission Date : NOV 01, 2023
NHTSA Recall No. : 23V-733
Manufacturer Recall No. : NR
Manufacturer Information :
Manufacturer Name : Mercedes-Benz USA, LLC
Address : 13470 International Parkway
Jacksonville FL 32218
Company phone : 1-877-496-3691
Population :
Number of potentially involved : 8
Estimated percentage with defect : 100 %
Vehicle Information :
Vehicle 1 : 2020-2020 Mercedes-Benz GLS580
Vehicle Type : LIGHT VEHICLES
Body Style : SUV
Power Train : GAS
Descriptive Information : Mercedes-Benz 2020 GLS 8 Vehicles
The recall population was determined through production records.
Vehicles outside of the recall population have a sunroof control unit equipped with
software that conforms to the standards set forth in FMVSS 118, S6(a)(1).
Production Dates : FEB 08, 2019 – SEP 20, 2019
VIN Range 1 : Begin : NR End : NR Not sequential
Description of Noncompliance :
Description of the
Noncompliance :
Mercedes-Benz AG (“MBAG”), the manufacturer of Mercedes-Benz vehicles, has
determined that on certain Model Year 2020 GLS (167 platform) vehicles, the
sunroof control unit software might not meet current production
specifications. In this case, the sunroof might automatically close when the
vehicle’s “car-wash-mode” is activated.
FMVSS 1 : 118 – Power-operated window systems
FMVSS 2 : NR
Description of the Safety Risk : The car-wash-mode is activated via the central touch display or the touchpad
in the center console.
Although anti-pinch protection is in place, using the actuation device test
procedure in FMVSS 118, S6(a)(1) might allow the sunroof to automatically
close, which is contrary to the requirements of the regulation.
The unintended auto-closure of the sunroof might pose a risk of injury
Description of the Cause : Due to a deviation in the development process, the affected vehicles are
Part 573 Safety Recall Report 23V-733 Page 2
The information contained in this report was submitted pursuant to 49 CFR §573
equipped with a sunroof control unit software version that includes an
automatic closing function of the sunroof when the car-wash-mode is activated.
Identification of Any Warning
that can Occur :
The driver will not receive a warning due to the nature of the failure
mechanism.
Involved Components :
Component Name 1 : SOFTWARE ASHD
Component Description : SOFTWARE ASHD
Component Part Number : A1679020606
Supplier Identification :
Component Manufacturer
Name : Mercedes-Benz AG
Address : NR
Foreign States
Country : Germany
Chronology :
In May, 2019, MBAG found that there was a deviation in the software-development process which allowed the
sunroof to be closed automatically through operation of the car wash mode via touchpad. This operation was
inconsistent with the design intent. A plant action was initiated to reflash the software.
In June, 2019, it was determined that certain vehicles may have been released from the plant without the
software reflash. Therefore initial investigations were launched immediately to identify the affected vehicle
population and where these vehicles are located. Through summer and early autumn, MBAG conducted a
review of the circumstances under which the sunroof could be closed and determined that there was no safety
risk due to the automatic reverse feature and because multiple steps were required to initiate the car wash
mode so there was no risk of the sunroof closing inadvertently.
Subsequently, in November, 2019, the question was raised whether the ability to close the sunroof in the car
wash mode was consistent with the circumstances under which the sunroof could be operated.
A review of legal and regulatory provisions ensued into 2020, and on May 4, 2020, MBAG determined that the
operation of sunroof as a consequence of the activation of the car wash mode via the central touch display or
the touchpad of the center console might be considered a noncompliance.
MBAG therefore decided to report a noncompliance with a request for inconsequential treatment.
Some of the affected vehicles could have been resolved while still in access at the dealerships in advance of
customer delivery.
On October 25, 2023, NHTSA published its denial of MBAG’s petition for inconsequentiality in the Federal
Part 573 Safety Recall Report 23V-733 Page 3
The information contained in this report was submitted pursuant to 49 CFR §573
Register.
In accordance with that denial, MBAG determined on October 27, 2023 to conduct a recall.
MBAG confirms there are no warranty claims, field or service reports, and other information (such as the
numbers of deaths and/or injuries) related to this defect in the USA.
Description of Remedy :
Description of Remedy Program : An authorized Mercedes-Benz dealer will update the sunroof control unit
software on the affected vehicles.
Pursuant to 49 C.F.R. § 577.11(e), MBUSA does not plan to provide notice
about pre-notice reimbursement to owners since none of the involved
vehicles would have been previously subject to the condition described
and all remain covered under the new vehicle warranty
How Remedy Component Differs
from Recalled Component :
Sunroof control unit software according to specification. SOFTWARE ASHD
A1679020606
Identify How/When Recall Condition
was Corrected in Production :
A change of the development process ensures that this issue can no longer
occur from September 23, 2019 onwards.
Recall Schedule :
Description of Recall Schedule : Dealers will be notified of the pending voluntary recall campaign on
November 8, 2023. Owners will be notified of the voluntary
recall campaign before December 31, 2023.
A copy of all communications will be provided when available.
Planned Dealer Notification Date : NOV 08, 2023 – NR
Planned Owner Notification Date : DEC 31, 2023 – NR
* NR – Not Reported

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