NHTSA ID Number: 11031507
Manufacturer Communication Number: LI77.21-P-075806
TSB/Document Date: 2026-04-22
Summary
Complaint The sliding sunroof glass panel of the panoramic roof reverses during the closing process, either once or multiple times, without an entrapment (anti‑pinch) event being detected. The concern may occur temporarily or repeatedly during normal closing operation. Cause The automatic reversing function of the panoramic roof is overly sensitive due to parameterization in combination with seal counter‑pressure. This condition can cause the roof to reverse even though no obstruction is present. Remedy Retrofit the vehicle to meet Cleanpoint status “Panoramic sliding sunroof glass panel reverses during closing without a pinch event.” The retrofit includes: • Hardware modification (installation of a cover rail / EPDM lip) • Corresponding software update for the panoramic roof control unit The prescribed retrofit steps must be performed in the specified sequence as outlined in this document. 1) Retrofit the EPDM lip onto the rear edge of the panoramic sliding roof panel: • Clean the underside of the rear edge of the sliding sunroof panel (marking, Figure 1) (e.g., isopropanol). • Subsequently install the cover rail on the underside of the sliding sunroof panel (Figure 2). - Distance from the cover rail to the rear edge of the sliding sunroof panel A = 5 mm - Distance from the cover rail to the right and left edges of the sliding sunroof panel B = 9 mm - Apply firm pressure by hand along the entire bonding surface of the COVER RAIL - The wider flange at the ends of the cover rail (see Figure 3) must point in the direction of travel 2) Submit an XSS Ticket with the following requests to add SA code O75 to the Vehicle Data Card • Enter code "O75" (Oscar 75) in Vehicle Documentation System (Vedok): • Add the following AO text to KG 78: AO code O75 added as specified in LI77.21-P-075806 (Version 7). 3) Install new software from the panoramic roof control unit (TSSR296, A98, PSD) and teach in the anti-pinch protection again: • Connect XENTRY Diagnosis. - always use the current XENTRY Diagnosis software release with all available add-ons. - Strict compliance with the operation steps in XENTRY Diagnosis is absolutely essential! - Ensure adequate power supply to the vehicle's on-board electrical system battery (greater than 12.5 V) using a battery charger. • Commission the panoramic roof control unit - To do this, select "A98 – control module 'panoramic sliding sunroof' → adaptation → commissioning → Commission the control unit." - Then follow user guidance in XENTRY Diagnosis. • Disconnect XENTRY Diagnosis.
Panoramic Sliding Sunroof Reverses During Closing
Without Obstruction – No Anti‑Pinch Event Triggered
Topic number
LI77.21-P-075806
Version
7
Function group
77.21 - Panoramic roof
Date
4/20/26
Validity
BR296 with SA code 413 (panoramic roof), produced
up to 03/08/2023; BR294 without world manufacturer
code LE4, with SA code 413 (panoramic roof), produced
up to 03/09/2023; BR294 with world manufacturer code
LE4, with SA code 413 (panoramic roof), produced up to
02/01/2023
Reason for change
Retrofitting the vehicles in question to meet Cleanpoint
level status.
Complaint
The sliding sunroof glass panel of the panoramic roof reverses during the closing process, either once or multiple times, without an entrapment (anti‑pinch) event being detected.
The concern may occur temporarily or repeatedly during normal closing operation.
Cause
The automatic reversing function of the panoramic roof is overly sensitive due to parameterization in combination with
seal counter‑pressure.
This condition can cause the roof to reverse even though no obstruction is present.
Remedy
Retrofit the vehicle to meet Cleanpoint status
“Panoramic sliding sunroof glass panel reverses during closing without a pinch event.”
The retrofit includes:
•
•
Hardware modification (installation of a cover rail / EPDM lip)
Corresponding software update for the panoramic roof control unit
The prescribed retrofit steps must be performed in the specified sequence as outlined in this document.
1) Retrofit the EPDM lip onto the rear edge of the panoramic sliding roof panel:
•
•
Clean the underside of the rear edge of the sliding sunroof panel (marking, Figure 1) (e.g., isopropanol).
Subsequently install the cover rail on the underside of the sliding sunroof panel (Figure 2).
20.04.2026 20:52
© Copyright Mercedes-Benz
AG
SAHARRY
Page 1 / 4
- Distance from the cover rail to the rear edge of the sliding sunroof panel A = 5 mm
- Distance from the cover rail to the right and left edges of the sliding sunroof panel B = 9 mm
- Apply firm pressure by hand along the entire bonding surface of the COVER RAIL
- The wider flange at the ends of the cover rail (see Figure 3) must point in the direction of travel
2) Submit an XSS Ticket with the following requests to add SA code O75 to the Vehicle Data Card
•
•
Enter code "O75" (Oscar 75) in Vehicle Documentation System (Vedok):
Add the following AO text to KG 78: AO code O75 added as specified in LI77.21-P-075806 (Version 7).
3) Install new software from the panoramic roof control unit (TSSR296, A98, PSD) and teach in the anti-pinch protection again:
•
Connect XENTRY Diagnosis.
- always use the current XENTRY Diagnosis software release with all available add-ons.
- Strict compliance with the operation steps in XENTRY Diagnosis is absolutely essential!
•
- Ensure adequate power supply to the vehicle's on-board electrical system battery (greater than 12.5 V) using a
battery charger.
Commission the panoramic roof control unit
- To do this, select "A98 – control module 'panoramic sliding sunroof' → adaptation → commissioning → Commission the control unit."
•
- Then follow user guidance in XENTRY Diagnosis.
Disconnect XENTRY Diagnosis.
Attachments
File
Description
Abbildung 1.jpg
Clean the underside of the rear edge of the sliding sunroof panel at the marking (e.g., with isopropyl alcohol).
Abbildung 2.jpg
Subsequently install the cover rail on the underside of the
sliding sunroof panel.
20.04.2026 20:52
© Copyright Mercedes-Benz AG
SAHARRY
Page 2 / 4
Abbildung 3.jpg
The wider flange at the ends of the cover rail must be oriented in the direction of travel.
WIS-References
Document number
Title
Note
AD00.00-P-2000-06FR
Connect/disconnect diagnostic device -
Disclaimer
NOTE: The information contained in this document is intended for use by trained, professional technicians with the
knowledge to properly and safely perform diagnosis and repairs on Mercedes-Benz vehicles, using Mercedes-Benz
approved tools and equipment. It informs service technicians about conditions that could occur in certain vehicles and
provides information that could assist in proper vehicle diagnosis, service, or repair. It does not indicate that a defect
is present in any vehicle referenced in this document nor does it imply warranty coverage. DO NOT assume that a
symptom or condition, or a described cause of a symptom or condition, affects any particular vehicle or groups of vehicles, or that a described repair applies to any particular vehicle or groups of vehicles. There can be multiple causes
resulting in the same or similar symptoms or conditions described in this document, and trained professional service
technicians must use their diagnostic skills to make evaluations on a case-by-case basis. The information contained
in this document does not guarantee warranty coverage nor does it extend the vehicle’s warranty in any way.
Symptoms
Body > Roof system > Tilting/sliding sunroof system > Does not close
Parts
Part number
ES1 ES2 Designation
Quantity Note
EPC
A 294 782 06 00
cover rail (model 294)
1
X
A 296 782 17 00
cover rail (model 296)
1
X
Operation numbers/damage codes
Op. no.
Operation text
20.04.2026 20:52
© Copyright Mercedes-Benz AG
Time
SAHARRY
Damage
code
Note
Page 3 / 4
Bond the cover rail, including cleaning
5.0 AW
8201DGR
540650
Maintain on-board electrical system vol- 1.0 AW
tage (for testing and diagnostic work)
8201DGR
540991
Program and code control unit (maintain 2.0 AW
after quick test incl. on-board electrical
system voltage)
8201DGR
776901
Standardize panoramic sliding sunroof
and teach in automatic reversing function
8201DGR
20.04.2026 20:52
© Copyright Mercedes-Benz AG
2.0 AW
SAHARRY
Work must only be invoiced once
per workshop order.
Page 4 / 4
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TSB/Document ID: LI77.21-P-075806
Replacement Service Bulletin Number:
MFR Communication Date: 2026-04-20
MFR Internal Campaign ID/Software Version:
Communication Type: Service Bulletin/Repair Instructions
NHTSA Components: VISIBILITY/WIPER
MFR Component System:
MFR Component Subsystem:
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