Discrete
wiring
Windshield Washer
Pump
V5
Rear Window
Washer Pump
V13
58

664_120

Washer tank
General description
The washer fluid tank is installed in the wheel well behind
the right front wheel. This plastic tank has a capacity of
approximately 1.5 gal (5.7 l). The driver is alerted via the
instrument cluster display when the remaining fluid level is
about 1.7 qt (1.7 liters).

The tank should, if possible, be filled with clean, softened
water in order to avoid limescale build-up on the washer
jets. A windshield fluid (containing antifreeze in the winter)
should always be added to the water.

Filler cap

Windshield Washer Fluid Level Sensor
G33
Rear Window Washer Pump
V13
Headlamp Washer System Pump
V11

Windshield Washer Pump
V5
664_121

Wash water pumps
Headlamp Washer System Pump V11 is typically configured
as a mono pump and cleans both the headlights and the
night vision system camera at the same time.
Depending on equipment, Windshield Washer Pump V5
and Rear Window Washer Pump V13 can be configured as
mono or dual washer pumps.

The illustration of the washer fluid tank with pumps V5,
V11 and V13 shows the full equipment specification. Here,
V5 and V13 are configured as dual washer pumps. The
following table provides an overview of the version and the
tasks of pumps V5 and V13 depending on equipment.

Equipment

V5

V13

V5
Connection 1

V5
Connection 2

V13
Connection 1

V13
Connection 2

Windshield washer system

Mono

–

Windshield
washer jets

–

–

–

Windshield washer system
+ rear view camera

Dual

–

Windshield
washer jets

Rear view camera

–

–

Windshield washer system
+ laser scanner

Mono

Mono

Windshield
washer jets

–

Laser scanner

–

Windshield washer system
+ laser scanner

Mono

Dual

Windshield
washer jets

–

Laser scanner

Rear view camera

Wet arm wiper

Dual

–

Wet arm wiper
down

Wet arm wiper
up

–

–

Wet arm wipers + rear view
camera

Dual

Mono

Wet arm wiper
down

Wet arm wiper
up

Rear view camera

–

Wet arm wipers + laser
scanner

Dual

Mono

Wet arm wiper
down

Wet arm wiper
up

Rear view camera

–

Wet arm wipers + rear view
camera + laser scanner

Dual

Dual

Wet arm wiper
down

Wet arm wiper
up

Rear view camera

Rear view camera

59

Comfort System Central Control Module J393 (BCM2)
Comfort System Central Control Module J393 is based on the MLBevo platform and has been adopted from the Audi Q7 and
further enhanced. Key new features are the Audi connect key and the tail lights featuring OLED technology.
Comfort System Central Control Module J393:

Other integrated functions:

›› Is accessed via Address Word 46.
›› Is a comfort/convenience systems CAN user.
›› Has the following master functions:
›› Central locking system master
›› Immobilizer master

›› Terminal management.

›› Is the LIN master for:
›› LIN1: Windshield Defogger Control Module J505,
anti-theft alarm system sensor.
›› LIN2: Alarm Horn H12.
›› LIN3: Power Rear Lid Opening Control Module J938
(sensor-activated trunk lid).
›› Is located in the luggage compartment, on the left-hand
side, behind the side trim. Connectors and wires are
downward-facing for protection against moisture.

›› Entry and start authorization.
›› Central locking.
›› Anti-theft alarm.
›› Activation of the rear exterior lights.
›› Heated rear window.
›› Turn signal control.
›› Rear roller blind control.
›› Luggage compartment/trunk lid release and ‑luggage
compartment light control.
›› Fuel filler flap locking.
›› Trunk lid power closing system.
›› Sliding sunroof activation.
›› Roof roller blind activation.
›› Electronic steering column lock.
›› Sensor-activated luggage compartment release.
›› Fuel tank sensor management.
›› Automatic switch-on of the turn signal system and
unlocking of the doors in a collision triggering the crash
sensor.

60

Terminal management
General description
Terminal management for the 2019 A8 is similar to that of
the 2017 Q7. For information about the signal characteristic for activating Terminals 15 and 30, refer to eSelf-Study
Program 970463, The 2017 Audi Q7 Convenience Electronics.

Because the 2019 A8 has both a 12-volt pinion-type starter
and a 48-volt starter generator, there are differences to the
Audi Q7 with regard to starting the engine.

Engine starting with 12-volt pinion-type starter
The engine of the 2019 A8 is always started with the 12
volt pinion type starter for the first time and at engine oil
temperatures below 113 °F (45 °C).

Engine Control Module J623 receives the start request as a
discrete signal and a FlexRay message from the Comfort
System Central Control Module J393. J623 activates both
Terminal 50 relays, which in turn activate the 12-volt pinion-type starter.

Start request

Terminal 15
Terminal 50 relay 1

FlexRay

Terminal 50 relay 2

Engine
Control Module
J623

M
Pinion-type starter
664_127

Engine starting with 48-volt starter generator

Start request

The 48-volt starter generator is always used at engine oil
temperatures above 113 °F (45 °C), and for restarting after
engine shut-off by the start-stop system or by the intelligent coasting function.

The Engine Control Module J623 either receives a start
request as a discrete signal and a FlexRay message from
the Comfort System Central Control Module J393 or determines by itself to restart the engine. J623 then activates
the starter generator via a private CAN bus.

FlexRay

Engine
Control Module
J623

Private CAN bus

M
Starter generator

664_128

61

Central locking
All doors and the luggage compartment lid can be centrally
locked and unlocked at once. As is customary, the system
can be configured via the MMI to unlock the complete
vehicle or only the driver's door. The turn signals flash twice
when the vehicle is unlocked and once when it is locked.

The new 2019 A8 can be unlocked/locked in different
ways:
›› By car key
›› By the sensors in the door handle
›› By the locking cylinder on the driver's door
›› By the interior central locking switch

Conditions for successful vehicle locking are:
›› If the vehicle is locked with the radio remote control or with Driver Side Exterior Door Handle Switch F546:
›› The driver's door must be closed and the transmission selector lever must be in the Park position.
›› When the vehicle is locked by Driver Interior Locking Button E308:
›› All doors must be closed
›› In this scenario, the door can be opened after operating the interior door handle.

Control modules, sensors and actuators belonging to J393:
MX1

MX2

M5

M7

MX3

MX4

M6

M8

R200

F266

F329

R201

J519

J386

J393

J533

R137

G415

J387

R138

G416

R376

G417

K133

VX4

VX5

L131

L132

VX21

VX22

F2

F3

F241

F242

V161

V162

V503

V504

G418

Comfort/convenience
systems CAN
Comfort/convenience
systems CAN 2

Key
F2
F3
F241
F242
F266
F329

62

Driver Door Contact Switch
Front Passenger Door Contact Switch
Driver Lock Cylinder Contact Switch
Front Passenger Lock Cylinder Contact Switch
Engine Hood Contact Switch
Hood Contact Switch 2

664_039

G415
G416
G417
G418
J386
J387
J393
J519
J533
K133
L131
L132
M5
M6
M7
M8
MX1
MX2
MX3
MX4
R137
R138
R200
R201
R376
V161
V162
V503
V504
VX4
VX5
VX21
VX22

Driver Exterior Door Handle Touch Sensor
Front Passenger Exterior Door Handle Touch Sensor
Left Rear Exterior Door Handle Touch Sensor
Right Rear Exterior Door Handle Touch 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
Indicator lamp for SAFE function of central locking system
Driver Exterior Rearview Mirror Turn Signal Bulb
Front Passenger Exterior Rearview Mirror Turn Signal Bulb
Left Front Turn Signal Bulb
Left Rear Turn Signal Bulb
Right Front Turn Signal Bulb
Right Rear Turn Signal Bulb
Left Front Headlamp
Right Front Headlamp
Left Tail Lamp
Right Tail Lamp
Access/Start System Antenna in Luggage Compartment
Access/Start System Antenna 1 in Vehicle Interior
Left Access/Start Authorization Antenna
Right Access/Start Authorization Antenna
Front Access/Start Authorization Antenna
Driver Door Central Locking -Safe- Motor
Front Passenger Central Locking -Safe- Motor
Driver Side Central Locking Motor
Front Passenger Side Central Locking Motor
Driver Exterior Rearview Mirror
Front Passenger Exterior Rearview Mirror
Driver Door Lock Unit
Front Passenger Door Lock Unit

Anti-theft alarm
The basic functions of the anti-theft alarm system are
identical in all Audi vehicles. The interior monitoring
system is based on that of the 2017 Audi Q7, and the
parameters have been adapted in a model-specific way.
To arm the anti-theft alarm system, the following conditions must apply:
›› The vehicle must be locked with either the locking cylinder, the remote control key or the exterior door handle
switch (in models with advanced key).
›› The driver's door must be closed.
›› Neither the NO contact nor Terminal 15 may be active.

An alarm is activated by Alarm Horn H12 as soon as any of
the following events occurs:
›› A door is opened.
›› The hood is opened.
›› The trunk lid is opened.
The alarm also activates in the following situations:
›› The interior monitoring system detects movement inside
the occupant cell via the ultrasound sensors (the alarm is
also triggered when a window is broken).
›› The inclination sensor provides tow-away protection. In
addition, Vehicle Inclination Sensor G384 detects when
the vehicle is raised.

It takes about 30 s until the anti-theft alarm is armed.
Two sensors are combined in Anti-Theft Alarm System
Sensor G578:
›› Interior Monitoring Sensor G273.
›› Vehicle Inclination Sensor G384.

Schematic diagram of the networking system

F266

J519

Comfort/
convenience
systems CAN 2

F3

F506

J387

J927
Comfort/
convenience
systems CAN

J533

G525

J393

G578
LIN