F329

J386

J926

F2

F505

G526

H12

664_056

Location of Alarm Horn H12

Key:
F2
F3
F266
F329
F505
F506
G525
G526
G578
J386
J387
J393
J519
J533
J926
J927
H12

Driver Door Contact Switch
Front Passenger Door Contact Switch
Engine Hood Contact Switch
Hood Contact Switch 2
Driver Side Rear Door Contact Switch
Passenger Side Rear Door Contact Switch
Rear Lid -Closed- Sensor 1
Rear Lid -Closed- Sensor 2
Anti-Theft Alarm System Sensor
Driver Door Control Module
Front Passenger Door Control Module
Comfort System Central Control Module
Vehicle Electrical System Control Module
Data Bus on Board Diagnostic Interface (gateway)
Driver Side Rear Door Control Module
Passenger Side Rear Door Control Module
Alarm Horn

664_123

63

Rear Lid Control Module J605
A power opening and closing trunk lid is standard equipment.
A spindle drive is used on the left-hand side, eliminating the
need for the hydraulic damper.
Rear Lid Control Module J605 is located on the left-hand side
of the luggage compartment, behind the luggage compartment lining.
Opening and closing of the trunk lid:
›› The trunk lid can be unlocked with the remote control key.
›› The trunk lid can be unlocked with the advanced key or
with the advanced key with sensor-activated luggage
compartment release.
›› The trunk lid can be opened manually with the locking
cylinder.

664_014

Schematic diagram of the networking system

Spindle drive = trunk lid motor 1
V444

Comfort/convenience systems CAN
J605

J393

E406

E806

G525

LIN

V382

G526

V444

N527

664_016
F111

J938

F443

V53

G750

G760

Rear Lid Control Module
J605

Key:
E406
E806
F111
F443
G525
G526
G750
G760
J393
J605
J938
N527
V53
V382
V444

64

Rear Lid Lock Button in Luggage Compartment
Locking Mechanism Button in the Rear Lid
Rear Lid Contact Switch
Lock Pawl Contact Switch
Rear Lid -Closed- Sensor 1
Rear Lid -Closed- Sensor 2
Power Rear Lid Opening Sensor
Power Rear Lid Opening Sensor 2
Comfort System Central Control Module
Rear Lid Control Module
Power Rear Lid Opening Control Module
Coupling in Rear Lid Motor 1
Rear Lid Central Locking System Motor
Rear Lid Closing Aid Motor
Rear Lid Motor 1

664_015

Hands-free trunk release
It is also possible to open the trunk lid when the vehicle is
locked. For this purpose, it can be opened directly with the
corresponding button on the advanced key or with the
advanced key with sensor-activated luggage compartment
release.

When the two Power Rear Lid Opening Sensors G750 and
G760 detect the corresponding foot gesture (kick motion
beneath the rear bumper), Power Rear Lid Opening Control
Module J938 initiates an advanced key search at the rear of
the vehicle. If the key is recognized, opening of the trunk
lid is initiated. The trunk lid can also be closed by foot
gesture.
Power Rear Lid Opening Control Module J938 is a LIN bus
user connected to Comfort System Central Control Module
J393.

Schematic diagram

G750

Key:

G760

5

G750
G760
J938
1
2
3
4
5

5

1

2

3

Power Rear Lid Opening Sensor
Power Rear Lid Opening Sensor 2
Power Rear Lid Opening Control Module
G750 Sensor G750 Sensor +
G760 Sensor G760 Sensor +
Shielding

4

J938

664_017

Power Rear Lid Opening Sensor 2
G760

Power Rear Lid Opening
Sensor G750

Power Rear Lid Opening Control Module
J938

664_018

65

Garage Door Opener Control Module J530
The garage door opener of the A8 is based on the proven
HomeLink® system. Different systems, such as garage
doors, safety systems or house lighting can be activated by
radio remote control.
Both fixed code systems and rolling code systems can be
programmed in the MMI.
Once programmed, the systems can be selected on the
lower display and, for example, opened or closed with the
HomeLink® button.

The HomeLink® garage door opener system can be programmed by linking to a GPS satellite which determines
the location of the garage door opener system and displays
this automatically on the MMI when the vehicle approaches
it.
Garage Door Opener Control Module J530 is a LIN user of
the Vehicle Electrical System Control Module J519. Garage
Door Opener Programming Antenna R278 required for
programming the garage door opener is located inside the
vehicle, near the rear bench seat heel plate.

If more than one hand-held transmitter is programmed for
the vehicle, the button on the lower display must be
selected first, followed by the corresponding system.

Garage Door Opener Control Module J530 is installed in the
rear cross panel, below the rear bumper.

Installation location

Schematic diagram
Term. 30

J530

LIN

664_009

Garage Door Opener Control Module
J530

Term. 31

J519

R278

664_010

Key:

Homelink:
objects detected by GPS

J519 Vehicle Electrical System Control Module
J530 Garage Door Opener Control Module
R278 Garage Door Opener Programming Antenna

664_122

66

Windshield Defogger Control Module J505
The windshield heater in the new A8 is still powered by a
DC-to-DC converter on the basis of the 12V battery. The
maximum heating capacity of the windshield heater has
been reduced to 700 W. Heating capacity is regulated
automatically in a continuously variable manner according
to the prevailing ambient conditions.

The following components and control units participate in
the windshield heating system:
›› Battery A.
›› Windshield Defogger Control Module J505.
›› Comfort System Central Control Module J393.
›› Switch Module in Instrument Panel, Center EX22.
›› Windshield.

The battery voltage is transmitted to Windshield Defogger
Control Module J505 via the reference wire at Terminal 30.
If the battery voltage is too low, the windshield heater
cannot be activated.

The windshield heater is operated via the Front Information
Display Control Head 2 J1060. After pushing the Defrost
button, the windshield heater is activated automatically at
low ambient temperatures. An activated windshield heater
is indicated by Windshield Defogger Indicator Lamp K122.

Schematic diagram of the windshield heater

EX22

E627

K122
LIN

J393

J505

J519
Comfort/conv.
systems CAN 2

Term. 31

LIN

J533
Comfort/conv.
systems CAN
Term. 30
Heated
windshield

(0-31 V) Windshield +
Windshield -

R = 1.95 ohm
P = 0 - 700 watts
Reference cable, term. 30

Battery

664_019

Key
E627
EX22

Windshield Defogger Button
Switch Module in Instrument Panel, Center

J393
J505
J519
J533

Comfort System Central Control Module
Windshield Defogger Control Module
Vehicle Electrical System Control Module
Data Bus on Board Diagnostic Interface

K122

Windshield Defogger Indicator Lamp

67

Instrument Cluster Control Module J285
The Audi virtual cockpit displays all information directly to
the driver in high resolution.

Rain/Light Recognition Sensor G397 is responsible for
automatic brightness control in the Audi virtual cockpit.

Information and instruments, such as the speedometer and
tachometer, are displayed with absolute precision. The
driver can choose between two views: In the classic view
the gauges dominate the display, while in "Infotainment
mode" the navigation system, telephone, Audi connect or
media are highlighted.

The new processor provides the digital instrument cluster
with full HD resolution.
Note: The photocell, which was typically located at the bottom of the instrument cluster, was not functional after the launch of the new Audi A5 on the
basis of the MLBevo platform even though it was still installed on a transitional basis. This photocell is no longer featured in the instrument cluster of
the new Audi A8 .

Instrument cluster connector
MOST connector
LVDS connector

664_027

664_048

Coolant temperature display

Fuel gauge

Different displays will be used in the event that alternative drive concepts are introduced at a future date.

Reference
For detailed information about the Audi virtual cockpit, refer to eSelf-Study Program 910153, Audi Virtual Cockpit.

68

Windshield Projection Head Up Display Control Module J898
The optional head-up display, Windshield Projection Head
Up Display Control Module J898, projects warnings and
selected information onto the windshield in such a way
that the displays appear in the driver's extended field of
vision.

The head-up display in the new Audi A8 communicates with
the VAS Scan Tool via Address Word 82.

The head-up display content can be switched on and off
with the relevant button in the function bar in the lower
display.

Signal inputs and outputs in the head-up display:

The settings can also be recalled and changed using this
function button.
The following can be set:
›› Screen height.
›› Screen rotation.
›› Display brightness.
›› Display content.

The head-up display is connected to both the instrument
cluster CAN bus and the MOST bus.

CAN high, CAN low, Terminal 30, Terminal 31, MOST signals
with optical signal input and output.
›› The head-up display is the only control module connected to the optical bus system which does not participate in the component protection system.
›› The windshield has to be replaced in order to remove
Windshield Projection Head Up Display Control Module
(head-up display) J898. The individual steps are
described in the workshop manual.

Various settings are saved to the active private profiles
automatically.

Sequence of MOST bus ring users
Installation location of the head-up display
MOST bus

5

4

3
Mounting bracket
for head-up display

1

2

Instrument panel insert CAN

Infotainment CAN
664_029
664_049

Key
1
2
3
4
5

Information Electronics Control Module 1 J794
Instrument Cluster Control Module J285
Windshield Projection Head Up Display Control Module J898
DVD changer R161
Digital Sound System Control Module J525

69

Head-up display MOST bus interface
The head-up display is both an instrument cluster CAN user
and a MOST bus user.
Information Electronics Control Module 1 J794 makes, for
example, the detailed intersection map available by MOST
bus. In complex driving situations not only a map or an
arrow is shown on the head-up display, but also the moving
location arrow in the map displayed.

This is transmitted from Information Electronics Control
Module 1 J794 to the head-up display as a video stream
signal.
In the case of the head-up display the data of a possible
software update is imported in a conventional manner via
the instrument cluster CAN.

664_030

Movable location arrow in the head-up display

70

Door Control Modules J386/J387
All door control modules have their own Address Word and
are accessed with the VAS Scan Tool.

The following Address Words are assigned to the control
units:

On each side of the vehicle, the rear door control unit is
connected to the front door control unit by LIN data bus.

›› Driver Door Control Module J386:

42

›› Front Passenger Door Control Module J387:

52

›› Driver Side Rear Door Control Module J926:

BB

›› Passenger Side Rear Door Control Module J927: BC

Network overview
Key

Comfort/convenience
systems CAN

J533

J386
J387
J533
J926
J927

LIN
J386

J926

J387

J927

Driver Door Control Module
Front Passenger Door Control Module
Data Bus on Board Diagnostic Interface
Driver Side Rear Door Control Module
Passenger Side Rear Door Control Module