Technical Service Bulletin
Topic

Sunroof blind not retracting | Bentayga Series | 17-26MY

Market area

Bentley: worldwide (2WBE),China 796 VW Import Comp. Ltd (Vico), Beijing (6796)

Brand

Bentley

Transaction No. 2078373/1
Level

EH

Status

Released for publishing

Release date

Sep 10, 2025

New customer code

Object of complaint

Complaint type

roof systems, special equipment -> sliding/tilting sunroof

functionality

roof systems, special equipment -> sliding/tilting sunroof, panorama
roof actuator -> power sun shade

functionality -> operation
sequence incorrect

roof systems, special equipment -> sliding/tilting sunroof, panorama
roof actuator -> mechanical sun shade

functionality -> operation
sequence incorrect

roof systems, special equipment -> panorama sliding sunroof ->
bow for panorama sunroof shade

component, automotive
fluids -> damaged

body attachments and installations -> blinds system operation

functionality

roof systems, special equipment -> sliding/tilting sunroof -> sliding
/tilting sunroof sun visor

contamination -> dirty

Vehicle data
17-26MY Bentayga Series
Sales types

Type MY

Brand Designation Engine code Gearbox code Final drive code

4V1* 2017 E

*

*

*

4V1* 2018 E

*

*

*

4V1* 2019 E

*

*

*

4V1* 2020 E

*

*

*

4V1* 2021 E

*

*

*

4V1* 2022 E

*

*

*

4V1* 2023 E

*

*

*

Position

4V1* 2024 E

*

*

*

4V1* 2025 E

*

*

*

4V1* 2026 E

*

*

*

ZV1* 2023 E

*

*

*

ZV1* 2024 E

*

*

*

ZV1* 2025 E

*

*

*

Documents
Document name
master.xml
carbaflo_2160_tds.pdf

Technical Service Bulletin
Sunroof blind not retracting | Bentayga Series | 17-26MY

Transaction No.: 2078373/1
Release date: Sep 10, 2025

Condition
Customer may report that the sunroof blind is stuck in the open position and cannot be closed using interior
controls. The Sunroof blind is stuck due to uneven/ruffled or crumped during open or closing.

Technical Background
The issue may be caused by one or more of the following:
•

Physical damage to the sunroof blind

•

Blind has come off its runners

•

Broken or worn slide shoes

•

Contamination of the guides or slide paths due from debris (e.g., leaves, stones, dust)

•

Faulty or non-responsive sunroof blind motor

•

Sunroof blind motor drive gear is clogged with fibres.

Each of these issues must be assessed and documented before any parts are replaced.
Refer to the measure section for further information.

Production Solution
Under Review

Service
CAUTION
Please ensure all guidelines within the repair manual are strictly followed before and whilst conducting any
work on vehicles with a High voltage system
Do not replace any parts before conducting the required contamination and/or damage checks, see steps 17 below.
Should part 4M0 877 307 A/B (Sunblind) be confirmed faulty after following the steps 1-7 below, replace the
part and include the following in a non-technical DISS ticket, clear photos of the fault and the identification
serial number label of the roof and the sunroof blind (see figure 7 for serial number location).
Refer to ElsaPro Repair Group 60 ‘Sunroof sunblind – To remove and fit’

If, the sun roof blind is not damaged or contaminated. Attempt to operate the blind using the interior controls.
If no motor sound is present: proceed with electrical diagnosis of the motor unit. If required, refer to ElsaPro
Repair group 60 ‘Sunroof motor – To remove and fit’.
NOTICE

IMPORTANT: Only replace the motor if it is electronically or mechanically faulty. If the motor is to be
replaced. Submit a non-technical DISS query and include clear photographs of the serial number of the
roof and sunroof blind. See figure 7.

Contamination and/or damage Inspection

Figure 1 Contamination of roof / guides for sunblind slide shoes

1. Inspect the sunroof blind frame for contamination of the guides (located under rear glass).

2. While the sunroof is stationary, visually inspect the rear section of the guide channels from underneath the
rear glass. Check for small materials such as:
•

Small stones

•

Excessive dirt or dust

•

Organic matter (e.g., pine needles, leaves).

NOTICE
The guides must be completely clean and free from all contamination to ensure smooth operation.

Figure 2 Contamination of roof check

3. Inspect areas ‘A’ labelled in figure 2 of the frame for contamination.
The yellow markings highlight the area most likely to become contaminated when the roof is opened.

Figure 3 Damage of the sunroof blind slide shoes due to contamination check

4. Inspect the sunroof blind slide shoes for:
•

Cracks

•

Wear

•

Missing plastic components

•

Distortion from misalignment.

NOTICE
All slide shoes must be intact and free of visible damage.

Figure 4 Contamination of roof / PDF strip check

5. Inspect the PDF strip of the blind material, check for contamination on areas corresponding to the slide
shoe path. If the guide is contaminated it is likely that the PDF strip is also contaminated or damaged.

Figure 5 PDF strip derailment check

6. Inspect the blind guides if they are coming off the runners and check the PDF strip for any derailing issue
or NOK welding of the PDF strip.

Figure 6 Sunblind beam check

7. Inspect the sunblind beam for scratches or damage. Damage would indicate presence of external
contamination.

Figure 7 Electric drive motor securing screws

8. Locate and carefully detach the sliding electric drive unit from the drive assembly by removing the three
securing screws circled in figure 7.

Figure 8 Electric drive motor pinion inspection

9. Carefully inspect the motor unit pinion to confirm the presence and condition of fibre before proceeding.

A build-up of fibres in the pinion drive gear can prevent sunroof blind operation

10. While the motor is disengaged from the drive cables, run the motor to verify that it operates correctly in
isolation. If the motor operates OK whilst removed; clean/remove fibres from the pinion/ drive gear.

11. Apply grease to the motor unit pinion and reassemble the motor to the sunroof blind.

NOTICE
CARBAFLO® 2160 Perfluorinated High Temperature Grease must be used. Refer to the attached data
sheet for the required grease specification.

12. Operate the blind in one direction, then again carefully detach the sliding electric drive unit from the drive
assembly.

13. Re-apply grease to the motor unit pinion and finally re assemble the motor to the sunroof blind.

Location of Identification labels on the sunroof

Figure 9 Roof and Frame identification labels
After part replacement, include the following in a non-technical DISS ticket, clear photos of the identification
serial number label of the roof and the sunroof blind, see figure 9 above for serial number location.
The identification labels are only accessible with the interior headlining removed, refer to ElsaPro Repair
Group 70 ‘Headlining – To remove and fit’.

Warranty
Warranty type 110 or 910
Damage service number 68 96
Damage code 00 40
Time to remove and install sunroof blind
Labour operation code 60 70 19 00
Time 370 TU
Time to replace sunroof blind motor unit
Labour operation code 60 72 19 00
Time 180 TU
Time to remove and fit headlining
Labour operation code 70 84 19 00
Time 340 TU

Required Parts and Tools
Part Number

Description

Replace If..

4M0 877 307 A/B

Sunroof Blind

Blind is damaged, off runner, or
slide shoes broken.

4M0 959 591

Sliding Motor

Confirmed electronically or
mechanically faulty

Refer to ETKA parts catalogue

PRODUCT - INFORMATION
O ® 2160

Perfluorinated High Temperature Grease

Product description
CARBAFLO® 2160 is a soft high temperature resistant grease
for the lubrication of high temperature bearings. It is resistant
against organic alkaline and inorganic acids and exhibits excellent high pressure properties. The low evaporation rate of
the base oil guarantees extended re-lubrication intervals at
elevated temperatures, which often reach or are longer than
the lifetime of the components.

Ingredients
CARBAFLO® 2160 contains PTFE, Fluorohydrocarbonpolymers, EP-, Anti-wear-, corrosion protection-, dewatering– and high pressure-additives.

TEST

SPECIFICATION

Appearance
Colour
Density (20°C)
Consistancy (NLGI - Grade)
Viscosity index (Base oil)
Viscosity (Base oil)

Evaporation losses
VKA Test (75°C, 1200rpm, 40kg
Operation temperature

IP 365 / 85

20 °C
40 °C
100 °C
ASTM D2595 (Base oil)
ASTM D4172
DIN 51802

RESULT
soft, homogenous, pasty
white
1,9 g/cm³
1-2
320
550
310
86
149 °C 0,0
204 °C 0,4
1,21 mm
-60°C up to +260 °C

Advantage
CARBAFLO® 2160 is resistant against the most organic solutions and inorganic acids and has a better oxidation resistance than mineral or synthetic oils. It protects from corrosion and in non toxic in the usable
temperature range.
CARBAFLO® 2160 has excellent high pressure properties, which work along the whole temperature range.
The product is chemically inert and is not influenced by chemicals used for metalworking or coating.
CARBAFLO® 2160 has outstanding dielectric properties and is suitable for the lubrication of electrical com-

Application
The surfaces should be completely cleaned from dust, dirt, fingerprints, mineral oils or other synthetic oils
than CARBAFLO® and so on.
Cleaning from CARBAFLO® 2160 can be done by CARBAFLO® 790

FUCHS LUBRITECH GMBH
- MOLY-PAUL DIVISION -

Neuenhofstraße 101
47055 Duisburg / Germany
phone: +49 (0) 203 578861-0
fax:
+49 (0) 203 57886120
e-mail: [email protected]
www.kspaul.de

January 2013

Rev. 08

DIN ISO 9001 / EN 29001