Technical Service Bulletin
Topic
Market area
Brand
Transaction
No.
Level
Status
Release date

Infotainment Upgrade Unit Diagnosis | Continental GT/GTC and Flying Spur
Bentley: worldwide (2WBE),China 796 VW Import Comp. Ltd (Vico), Beijing (6796),Russian Federation 935 Volkswagen Group
RUS (6935)
Bentley
2076639/2
EH
Released for publishing
Apr 7, 2025

New customer code
Object of complaint
Complaint type Position
information, navigation, communication, entertainment -> radio, navigation, MMI and drive device functions functionality

Vehicle data
--Sales types
Type
39*
39*
39*
39*
39*
39*
39*
4W*
4W*
4W*
4W*
4W*

MY
2012
2013
2014
2015
2016
2017
2018
2014
2015
2016
2017
2018

Brand Designation Engine code Gearbox code
E
*
*
E
*
*
E
*
*
E
*
*
E
*
*
E
*
*
E
*
*
E
*
*
E
*
*
E
*
*
E
*
*
E
*
*

Documents
Document name
master.xml
biu_diagnosis_guide.pdf

Final drive code
*
*
*
*
*
*
*
*
*
*
*
*

Technical Service Bulletin
Infotainment Upgrade Unit Diagnosis | Continental GT/GTC and Flying Spur

Transaction No.: 2076639/2
Release date: Apr 7, 2025

Condition
Failure evident with Bentley Information Upgrade Unit.

Technical Background
The attached document is to aid diagnosis for any faults that may be found within the Bentley Infotainment Upgrade Unit.

Production Solution
N/A

Service
Use the attached document to support with diagnosis of faults found within the Bentley Infotainment Upgrade Unit.

BIU DIAGNOSIS

INTERNAL

Table of content
Speaker Test ..........................................................................................................................1
Sound Output ......................................................................................................................1
Short to Ground ..................................................................................................................3
Short to VCC.......................................................................................................................3
Speaker Connection ...........................................................................................................4
Short across Speaker .........................................................................................................5
Load ...................................................................................................................................5
Thermal Warning ................................................................................................................7
Thermal Warning 1 ..........................................................................................................7
Thermal Warning 2 + 3 ....................................................................................................8
No audio from speaker ...........................................................................................................9
Radio .................................................................................................................................... 11
Navigation ............................................................................................................................ 12
Telephone............................................................................................................................. 14
Damper Diagnosis ................................................................................................................ 16
Wiper Park ........................................................................................................................... 18
TPMS Diagnosis................................................................................................................... 19
HVAC Diagnosis ................................................................................................................... 20
Amplifier ............................................................................................................................... 21
Input Gain Offset ............................................................................................................... 21

INTERNAL

BIU DIAGNOSIS

Speaker Test
Pressing the top right Icon starts the Speaker diagnosis and updates the status texts accordingly.

Sound Output
The Sound Output tests each Speaker by playing a Sound for each speaker.

1
INTERNAL

BIU DIAGNOSIS

The table below defines every diagnosis value.
Left Front Speaker
Short to GND
Short to VCC
Disconnection of a speaker
Short across speakers
Normal Load
Thermal warning 1 active
Left Rear Speaker
Short to GND
Short to VCC
Disconnection of a speaker
Short across speakers
Normal Load
Offset detected and automute
Right Front Speaker
Short to GND
Short to VCC
Disconnection of a speaker
Short across speakers
Normal Load
Diagnostic status
Standby status
Right Rear Speaker
2
INTERNAL

BIU DIAGNOSIS
Short to GND
Short to VCC
Disconnection of a speaker
Short across speakers
Normal Load
Thermal warning 3 active
Thermal warning 2 active

Short to Ground
A "short to ground" occurs when there's an unintended connection between a device's circuit
and the ground line. This connection bypasses normal components and allows electricity to
flow directly to the ground, which can damage the device. It's essential to identify and fix this
issue quickly to prevent damage and ensure safety. Tools like a multimeter can be used to
detect unexpected electrical flow and help locate the short circuit.

Short to VCC
A "short to VCC" occurs when there's an unintended direct connection between a component
of a device's circuit and the VCC line, which is the main source of positive voltage. This kind
of short circuit bypasses the intended paths and components, allowing excessive current to
flow directly from the power supply. This can lead to overheating, damage to the device, and
potential safety hazards. Detecting a short to VCC typically involves using diagnostic tools
like a multimeter to trace and resolve these unwanted connections.

3
INTERNAL

BIU DIAGNOSIS

Speaker Connection
The Diagnostic View displays the status of the speaker's connection, indicating whether it is
successfully connected.

4
INTERNAL

BIU DIAGNOSIS

Short across Speaker
A "short across speaker" occurs when an unintended direct connection is made across the
speaker terminals, bypassing the speaker itself. This situation allows current to flow directly
between the terminals without passing through the speaker, which can prevent sound
production and potentially damage the amplifier and speaker due to excessive current flow.
To diagnose and fix a short across speaker, use tools like a multimeter to check for unwanted
direct connection.

Load
The load is responsible for monitoring the output current sent to the speakers. An Output
peak current more than 500 mA indicates a normal load.

5
INTERNAL

BIU DIAGNOSIS

An "open load" condition refers to a disruption in the electrical load connection due to an
incomplete circuit. This occurs when there is a break or fault within the speaker wiring or
connection points, resulting in an output peak current of less than 250 mA. To resolve an
"open load" condition, check and secure all wiring connections, repair any breaks in the
circuit, and ensure that all components are properly connected.

6
INTERNAL

BIU DIAGNOSIS

Thermal Warning
"Thermal Warning" is a safety feature of the amplifier that monitors the internal temperature
of the amplifier's components. This warning indicates when the internal temperature
approaches a critical threshold that could potentially damage the amplifier if not addressed. It
serves as an early alert to take preventive actions, such as reducing the load or improving
cooling, to prevent the amplifier from reaching a temperature at which it would automatically
regulates itself. Regular monitoring of this warning helps maintain the amplifier's performance
and prolong its lifespan by ensuring it operates within safe temperature limits.

Thermal Warning 1

7
INTERNAL

BIU DIAGNOSIS

Thermal Warning 2 + 3

8
INTERNAL

BIU DIAGNOSIS

No audio from speaker
This view indicates whether the car is equipped with a Naim system and whether the
MediaBox is connected. The MediaBox connection status is determined solely by the
presence of the thick cable (see below picture). If this cable is not connected, the MediaBox
will be recognized as disconnected.

9
INTERNAL

BIU DIAGNOSIS

10
INTERNAL

BIU DIAGNOSIS

Radio
This screen provides an interface for controlling and monitoring the radio settings, particularly
for DAB, FM, and AM frequencies.
FM/AM Ant Status: Status of the FM/AM Antenna.
DAB Ant Status: Status of the DAB Antenna.

Label: Identifies the name or label of the current radio station or service being tuned in.
ServiceID: A unique identifier associated with each radio service or station in digital
broadcasting systems. This ID helps to differentiate between various stations within the same
ensemble.
Ensemble: In DAB (Digital Audio Broadcasting), an ensemble is a group of radio services
transmitted together on the same frequency.
SNR (Signal-to-Noise Ratio): A measurement of signal quality. The higher the SNR, the
clearer the audio quality, as it indicates the strength of the radio signal relative to background
noise.
RSSI (Received Signal Strength Indicator): A measure of signal power received by the
radio. Higher values generally represent stronger signals.
Audio (QoS): Indicates the Quality of Service (QoS) level for the audio signal. It assesses
how stable or reliable the audio stream is, with higher values indicating better quality.

11
INTERNAL

BIU DIAGNOSIS

Navigation
The Navigation Diagnosis shows the number of available satellites, the signal strength of
each satellite in dB-Hz and the accuracy of the location in meters.
To visualize these values, it is required to grant permission for the GPS.

In the top right corner, a legend is provided to describe each color based on signal strength:
Good Signal Strength: More than 30 dB Hz
Moderate Signal Strength: Between 20-29 dB Hz
Weak Signal Strength: Between 10-19 dB Hz
Poor Signal Strength: Less than 9 dB Hz
The system automatically checks every 5 seconds whether the navigation SD card is
inserted and updates the status text accordingly.

12
INTERNAL

BIU DIAGNOSIS

13
INTERNAL

BIU DIAGNOSIS

Telephone
The Telephone Diagnostic view is an interface used to monitor and assess various aspects of a
phone's connectivity and operational status. Here are the key features of this diagnostic view:
Telecom Service Status – Indicates whether the service is active and whether roaming is
enabled.
Signal Strength – Shows the strength of the network signal.
Battery – Displays the battery's charge level.
Remote Device Name – The name of the device being tested, in this case "iPhone 11 Test KR".
Operator – The network operator providing services.
Local Number – The phone number assigned to the device.
HFP State and HFP Audio State – Status indicators for the Hands-Free Profile (HFP), showing
whether a connection is established and whether audio is being transmitted over this
connection.
Remote Voice Dial – Indicates whether voice dialing through a remote connection is enabled.
HFP InBand Ringtone Support – Shows whether ringtones through the Hands-Free Profile are
supported.

14
INTERNAL

BIU DIAGNOSIS

15
INTERNAL

BIU DIAGNOSIS

Damper Diagnosis
The damper diagnosis feature provides a clear visualization of how different components
communicate regarding damper firmness and height. This view displays the values held by
each component, including the graphical user interface, BIU-CAN-Communication, and
External ECU, at the time of diagnosis. In the event of an error, the view identifies which
component is responsible for the failure. This view also shows weather the car is rising or is
lowering.

16
INTERNAL

BIU DIAGNOSIS

17
INTERNAL

BIU DIAGNOSIS

Wiper Park
The Wiper Park View is divided into two sections: Wiper Service Position and Active
Wiper.
The Wiper Service Position section displays the values for both the graphical user interface
and the BIU-CAN-Communication. When the Wiper Service Position is enabled, the values
for the graphical user interface and BIU-CAN-Communication are set to "true."
The Active Wiper section shows the value of the External ECU. Activating the wipers sets the
External ECU value to "true."

18
INTERNAL

BIU DIAGNOSIS

TPMS Diagnosis
The TPMS Diagnose View displays the availability of the TPMS and the tire pressure error
values.
TPMS availability is set to true when communication between the BIU-CAN system and the
external ECU is functioning correctly.
The Tyre pressure error reflects the value of the External ECU.

19
INTERNAL

BIU DIAGNOSIS

HVAC Diagnosis
The HVAC Diagnose View displays the K-CAN communication status and the availability of
the CLIMA ECU.
The K-CAN communication alive and the CLIMA ECU alive reflects the communication
between the BIU-CAN and the External ECU.
Disconnecting the HVAC Cable will lead to no K-CAN or CLIMA ECU communication.

20
INTERNAL

BIU DIAGNOSIS

Amplifier
Inside the Amplifier menu it is possible to adjust the Input Gain Offset. Each vehicle has its
own Input Gain Offset value.

Input Gain Offset
The Input Gain Offset is a setting in audio processing that adjusts the strength of the
amplifier's input signal, optimizing the volume of input signals to ensure they remain within an
ideal level range. The current implementation allows for the adjustment of the Input Gain
Offset between -128 and +127. Two different views are available for managing this setting.

View 1 NAIM Car

21
INTERNAL

BIU DIAGNOSIS

View 2 Non NAIM Car

22
INTERNAL