eSelf Study Program 970343

The 2015 Audi A3 Vehicle Electronics
and Driver Assistance Systems

2

Audi of America, LLC
Service Training
Created in the U.S.A.
Created 11/2013
Course Number 970343
©2013 Audi of America, LLC
All rights reserved. Information contained in this manual is based on
the latest information available at the time of printing and is subject to
the copyright and other intellectual property rights of Audi of America,
LLC., its affiliated companies and its licensors. All rights are reserved
to make changes at any time without notice. No part of this document
may be reproduced, stored in a retrieval system, or transmitted in any
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All requests for permission to copy and redistribute information should
be referred to Audi of America, LLC.
Always check Technical Bulletins and the latest electronic service repair
literature for information that may supersede any information included
in this booklet.

Revision
3
1: 11/2013

Contents
Introduction........................................................................................ 6
Topology the 2015 Audi A3 ..................................................................................................................7

Vehicle electronics............................................................................... 9
Door electronics ...................................................................................................................................11
Vehicle Electrical System Control Module J519 ................................................................................16
Electronic Steering Column Lock Control Module J764 ....................................................................20
Access/Start Authorization Control Module J518 .............................................................................21
Advanced Key .......................................................................................................................................22
Terminal management ........................................................................................................................25
Interior lighting ...................................................................................................................................29

Driver assistance systems..................................................................34
Rearview Camera R189 .......................................................................................................................34
Audi parking system ............................................................................................................................36
Audi side assist ....................................................................................................................................37
Driver Assistance Systems Front Camera R242 ................................................................................39

Audi lane assist and active lane assist...............................................41
Overview ...............................................................................................................................................41
Further development ..........................................................................................................................41
Active lane assist .................................................................................................................................42
Audi steering intervention ..................................................................................................................43
Operation ..............................................................................................................................................44

Self Study Programs..........................................................................45
Knowledge Assessment....................................................................46

4

This eSelf Study Program teaches a basic knowledge of the design and functions of new models,
new automotive components or technologies.
It is not a Repair Manual! All values given are intended as a guideline only.
For maintenance and repair work, always refer to the current technical literature.

Note

Reference
5

Introduction
Today, Audi is already setting new standards for driver
assistance systems in the A3 – introducing technologies
from the luxury class into the premium compact segment.
Several optional systems and one standard solution are
offered in the new 2015 Audi.
The optional Audi side assist supports the driver in changing lanes. From a vehicle speed of 18 mph (30 km/h ),
radar sensors at the rear monitor what is happening behind
and to the sides of the A3. A yellow LED in the door mirror
housing lights if another vehicle is driving in the blind spot
or is rapidly approaching from the rear. If the driver still
activates the turn signal for a lane change, the indicator
turns bright and flashes at a high frequency – a very effective warning signal.
Audi active lane assist becomes active at a speed of 40 mph
(65 km/h). It detects lane markings on the roadway based
on images from a small video camera mounted on the
rear-view mirror. If the vehicle approaches a lane marking
without activating the turn signal, the system assists the
driver in steering back into the lane by making a slight

intervention in the electromechanical power steering
system.
Of the optional driver assistance systems in the new A3,
adaptive cruise control (ACC) is the most complex. This
radar-based system maintains the desired distance to the
vehicle ahead by autonomously accelerating and braking
within certain limits over speeds ranging from 18 – 93 mph
(30 to 150 km/h). The driver can set the distance and the
control dynamics over four levels. If the car has the assistance package, which combines several systems, the
control range is extended to 125 mph (200 km/h).
In the North American region vehicles, the system intervenes just before crossing over a detected lane marking.
This function can help to prevent the car from leaving the
driving lane unintentionally, for example, due to driver
inattentiveness.
This new generation of lane-keeping assistance can offer
continuous relief to the driver, enhancing driving comfort.

611_001a

6

Topology the 2015 Audi A3
The topology shows all control modules with connectivity
to the data bus system. Some of the control modules
shown here are optional, country-specific equipment, or
will be introduced at a later date. Be aware that all the
modules shown will not be installed on every vehicle.
Light switch
E1

Headlight power
module, left
J667

Power Sunroof
Control Module
J245

Wiper motor
control unit
J400

Anti-theft Alarm
System Sensor
G578

Rain/Light
Recognition Sensor
G397

Alarm horn
H12

Headlight power
module, right
J668

Humidity sensor
G355

Power output
module for left
LED headlight

Vehicle Electrical
System Control
Module
J519

Power output
module for right
LED headlight

Instrument Cluster
Control Module
J285

Lane Change
Assistance Control
Module 2
J770

Steering Column
Electronics Control
Module
J527
Driver Side Rear
Door Control
Module
J926

Driver Door Control
Module
J386

Passenger Side
Rear Door Control
Module
J927

Front Passenger
Door Control
Module
J387

Data Link Connector
Multifunction
steering wheel
control unit
J453

Data Bus Onboard Diagnostic Interface
J533

Nox Sensor Control
Module
J583*

Access/Start
Authorization
Control Module
J518

Nox Sensor Control
Module 2
J881*

Electrical Steering
Column Lock
Control Module
J764

Passenger Occupant
Detection System
Control Module
J706

Engine Control
Module
J623

Airbag
Control Module
J234

Left Front Seat
Belt Tensioner
Control Module
J854
Right Front Seat
Belt Tensioner
Control Module
J855
Climatronic
Control Module
J255

DSG Transmission
Mechatronic
J743

Selector Lever
Sensor System
Control Module
J587

*2.0L TDI engine only
7

Fresh Air Blower
Control Module
J126

Refrigerant Circuit
Pressure Sensor
G805

Humidity Sensor in
Fresh Air Intake
Duct
G657

Air quality sensor
G238

For example, Cornering Lamp and Headlight Range Control
Module J745 would never be installed on the same vehicle
as Headlamp Range Control Module J431.

Headlamp Range
Control Module
J431

Multimedia System
Control Head
E380

Cornering Lamp and
Headlight Range
Control Module
J745

Front Information
Display Control
Head J685

Lane Change
Assistance Control
Module
J769

Digital Sound
System Control
Module
J525

Driver Assistance
Systems Front
Camera
J842
Distance Regulation
Control Module
J428

Information
Electronics Control
Module 1
J794
ABS/ESP
Control Module
J104

Battery Monitoring
Control Module
J367

Power Steering
Control Module
J500

Alternator
C

All Wheel Drive
Control Module
J492

Rearview Camera
System Control
Module
J772

Electronic Damping
Control Module
J250

610_001_pkd

Key:
Powertrain CAN bus

Infotainment CAN bus

LIN bus

Convenience CAN bus

Diagnostics CAN bus

Sub-bus systems

Extended CAN bus

Suspension CAN bus

MOST bus

8

Vehicle electronics
Instrument Cluster Control Module J285
Instrument cluster with monochrome Driver Information System
The monochrome Driver Information System has a resolution of
320 x 240 pixels.

611_003a

The process for navigating through the various menus is the same as that of the A6, A7, and A8 models.

Instrument cluster with color Driver Information System
The color display also has a resolution of 320 x 240 pixels.
Any vehicle with ACC will also have this type of instrument
cluster.

9

611_003a

Instrument cluster electrical connections
A fused terminal 30 wire and discrete terminal 31 wire are
routed to Instrument Cluster Control Module J285.
The module communicates with other modules via two
twisted CAN bus wires over the Convenience CAN.
In addition, J285 reads the signals from two fuel tank
senders and the Immobilizer Coil D2. The fuel senders use
three-wire technology. (Only quattro modules have two fuel
senders.)

On vehicles without Advanced key, Immobilizer Coil D2 is
located around the ignition switch and exchanges data with
the key when it is inserted.
In vehicles with Advanced key, Immobilizer coil D2 is
located in the approximate area where the ignition switch
would be. The position is marked for identification in case
an emergency start must be performed.

Convenience CAN Low

Convenience CAN High

Terminal 30

Anti-theft Immobilizer
Reader Coil D2

Fuel tank sender 2

Fuel tank sender 1

Instrument Cluster Control
Module J285

611_005

Immobilizer master function
Instrument Cluster Control Module J285 is the master module for the immobilizer system. The following control modules
have immobilizer functions:
•
•
•

Engine Control Module J623
Electronic Steering Column Lock Control Module J764
DSG Transmission Mechatronic J743

10

Door electronics
Driver Door Control Module J386
Installation location

611_006

Tasks and characteristics of the control module
• Convenience CAN participant

• Activating the indicator in the door mirror and the lights
of the optional interior light package

• LIN bus master for Driver Side Rear Door Control Module
• Monitoring the central power window button status

• Activating the window motor and the mirror adjustment
motors

• Monitoring the door contact switch, the central locking
button and child lock button status

• Activating the locking and SAFE motor in the driver door
locking unit*

• Monitoring the mirror adjustment switch and anti-theft
alarm deactivation button status

• Activating the door mirror heater
• Substitute master for the central locking system

• Monitoring the status of the micro-switch in the driver
door locking unit

* Not used in the North American region
11

Pin assignments Driver Door Control Module J386

Power supply
Terminal 30
B19

"Terminal 30" supply; protected by a 30A fuse

Terminal 31
B20

Ground circuit

Other supply voltages
C3
C4
C14
D5