NHTSA ID Number: 11029024
Manufacturer Communication Number: LI77.20-P-073486
TSB/Document Date: 2026-02-25
Summary
Complaint Water ingress at the sliding sunroof can lead to moisture in the interior. In some cases, the leakage may also be visible to the customer in the area of the overhead control panel. Cause The following causes can lead to water ingress in the area of the sliding sunroof and thus to moisture in the vehicle interior: 1. Incorrectly routed drain hoses: Water may accumulate in the rear area of the sliding sunroof frame (see picture #1). For example, the rear drain hoses may have been routed without sufficient slope, which consequently leads to the drains overflowing. Water can enter the vehicle interior through the headliner. 2. Sliding sunroof adjustment: An improper positioning of the tilting/sliding roof within the roof frame may, under certain circumstances, lead to increased water ingress through the seal between the sliding sunroof frame and the roof. However, one drop is permissible here. 3. Material degradation: Over time, the seal of the tilting/sliding roof may experience age-related changes in its elasticity, which could potentially affect its watertightness. Remedy Test procedure for suspected water ingress via the sliding sunroof: • In all three possible cases, the headliner must be removed. • First, the complaint must be reviewed. A rain test should be performed for this purpose. If water enters through the sliding/tilting roof, compare the amount of water entering with the reference video in the appendix. Please note that due to its design, the sliding sunroof is not completely watertight. (see Video 3) • If the amount of water does not correspond to the expected normal condition, the three potential causes should be checked, insofar as they apply to the specific case. (see Video 2) Re. cause 1: • Route the left rear and right rear drain hoses of the sliding sunroof frame from the upper clip-on point to the lower clip-on point. • This must be carried out for both fastening points at the C-pillar and D-pillar. Carry out this step on both the left and right side of the vehicle. • Then move the water drain hoses of the roof luggage rack mounts from the lower clip-on point to the upper clipon point (see Pictures 2 and 3, Video 1). • Reinstall the roof lining. Re. cause 2: • Adjust the sliding sunroof frame position relative to the roof (height) in accordance with WIS document AR77.20- P-1100XG. Re. cause 3: • Replace the seal on the tilting/sliding roof (A2057800098). The vehicles affected are those with a production date up to 17.09.2025 and a chassis number up to W1N465.###.#X065180. If a vehicle still has a leakage in the sliding sunroof after this Clean point, please create a TIPS case.
Water ingress at sliding sunroof
Topic number
LI77.20-P-073486
Version
2
Function group
77.20 - Electric sliding roof
Date
2/24/26
Validity
Type 463 as of model year 2019 (as of code XZ8) and sliding sunroof (code F15) type 465 with SA code 414
Reason for change
Expanded to include BR465 and adaptation of remedies
Complaint
Water ingress at the sliding sunroof can lead to moisture in the interior. In some cases, the leakage may also be visible to the customer in the area of the overhead control panel.
Cause
The following causes can lead to water ingress in the area of the sliding sunroof and thus to moisture in the vehicle interior:
1.
2.
3.
Incorrectly routed drain hoses: Water may accumulate in the rear area of the sliding sunroof frame (see picture
#1). For example, the rear drain hoses may have been routed without sufficient slope, which consequently leads
to the drains overflowing. Water can enter the vehicle interior through the headliner.
Sliding sunroof adjustment: An improper positioning of the tilting/sliding roof within the roof frame may, under
certain circumstances, lead to increased water ingress through the seal between the sliding sunroof frame and
the roof. However, one drop is permissible here.
Material degradation: Over time, the seal of the tilting/sliding roof may experience age-related changes in its
elasticity, which could potentially affect its watertightness.
Attachments
File
Description
Picture 1 - Waterlogging in drainage channel in sunroof
frame .JPG
Picture 1 - Description of problem
Remedy
Test procedure for suspected water ingress via the sliding sunroof:
24.02.2026 15:27
© Copyright Mercedes-Benz
AG
SAHARRY
Page 1 / 4
•
•
•
In all three possible cases, the headliner must be removed.
First, the complaint must be reviewed. A rain test should be performed for this purpose. If water enters through
the sliding/tilting roof, compare the amount of water entering with the reference video in the appendix. Please
note that due to its design, the sliding sunroof is not completely watertight. (see Video 3)
If the amount of water does not correspond to the expected normal condition, the three potential causes should
be checked, insofar as they apply to the specific case. (see Video 2)
Re. cause 1:
•
•
•
•
Route the left rear and right rear drain hoses of the sliding sunroof frame from the upper clip-on point to the lower clip-on point.
This must be carried out for both fastening points at the C-pillar and D-pillar. Carry out this step on both the left
and right side of the vehicle.
Then move the water drain hoses of the roof luggage rack mounts from the lower clip-on point to the upper clipon point (see Pictures 2 and 3, Video 1).
Reinstall the roof lining.
Re. cause 2:
•
Adjust the sliding sunroof frame position relative to the roof (height) in accordance with WIS document AR77.20P-1100XG.
Re. cause 3:
•
Replace the seal on the tilting/sliding roof (A2057800098).
The vehicles affected are those with a production date up to 17.09.2025 and a chassis number up to
W1N465.###.#X065180.
If a vehicle still has a leakage in the sliding sunroof after this Clean point, please create a TIPS case.
Attachments
File
Description
Picture 2 - Swap hoses left vehicle side.JPG
Picture 2 - Rework instruction for left side
Picture 3 - Swap hoses right vehicle side.JPG
Picture 3 - Rework instruction for right side
24.02.2026 15:27
© Copyright Mercedes-Benz AG
SAHARRY
Page 2 / 4
Video 1 - Rework instruction swap hoses.mp4
Video 1 - Rework instruction swap hoses
Rain+test-Before+adjustment.mp4
Video 2 - Raintest before adjustment
Rain+test-Afer+adjustment.mp4
Video 3 - Raintest after adjustment
WIS-References
Document number
Title
Note
AR68.30-P-4300XG
Remove/install headliner
Preparatory measures
AR77.20-P-1100XG
Adjust tilting/sliding roof panel
Remedy for cause 2
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 > Body/Cab > Body sealing > Water entry
Body > Roof system > Tilting/sliding sunroof system > Leaks
Parts
Part number
ES1 ES2 Designation
A2057800098
Quantity Note
Sliding roof seal
1
EPC
Remedy 3
X
Operation numbers/damage codes
Op. no.
Operation text
24.02.2026 15:27
© Copyright Mercedes-Benz AG
Time
Damage
code
Note
H
78151
Faulty setting of tilting/sliding roof
H
7810204
Seal on tilting/sliding roof leaking
SAHARRY
Page 3 / 4
24.02.2026 15:27
© Copyright Mercedes-Benz AG
H
78A04**
Incorrect routing of left rear water
drain hose
H
78N04**
Incorrect routing of right rear water
drain hose
SAHARRY
Page 4 / 4
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TSB/Document ID: LI77.20-P-073486
Replacement Service Bulletin Number:
MFR Communication Date: 2026-02-24
MFR Internal Campaign ID/Software Version:
Communication Type: Service Bulletin/Repair Instructions
NHTSA Components: STRUCTURE:BODY
MFR Component System:
MFR Component Subsystem:
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