Audi A4 2005 Service Training

The new Audi A4 ´05

Self-Study Programme 343

Service Training

Protected by copyright. Copying for private or commercial purposes, in part or in whole, is not
permitted unless authorised by AUDI AG. AUDI AG does not guarantee or accept any liability
with respect to the correctness of information in this document. Copyright by AUDI AG.

Audi introduces a new model generation that is
obvious at first glance.
The front-end styling of both saloon and Avant
models is new, with the addition of the
characteristic Audi single-frame grille.
The rear end, with its distinct horizontal lines, and
the sides, where the shoulder line lends the body
a distinctly sporty look, are also new.

Driving pleasure, superior technology, exciting
styling and a level of luxury that even satisfies the
demands made of the luxury car class.

The a rch itecture of the driver’s area, especially the
cockpit – a perfect synthesis of ergonomics,
function and design – is pioneering.

The new Audi A4 ´05

Excellence in design & performance

SSP 254 Audi A4 ‘01 - Technology

–The dash panel insert
–The chassis
–Heating and air conditioning

Order number: 040.2810.73.20

343_009

Protected by copyright. Copying for private or commercial purposes, in part or in whole, is not
permitted unless authorised by AUDI AG. AUDI AG does not guarantee or accept any liability
with respect to the correctness of information in this document. Copyright by AUDI AG.

NoteReference

Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

The p urp ose of the Self-Study Programme is to provide a basic knowledge of the design and function
of new models, new automotive components or new technologies.

The Self-Study Programme is not a Repair Manual!
All values given are intended as a guideline only, and refer
to the software version valid at the time of publication of the SSP.

For maintenance and repair work, always refer to the current technical literature.

Contents

Occupant protection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

Diagnosis . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

The engine . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

The chassis . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18

The body. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

The heating / air conditioning system . . . . . . . . . . . . . . 24

The convenience electronics . . . . . . . . . . . . . . . . . . . . . . 26

Protected by copyright. Copying for private or commercial purposes, in part or in whole, is not
permitted unless authorised by AUDI AG. AUDI AG does not guarantee or accept any liability
with respect to the correctness of information in this document. Copyright by AUDI AG.

4

Overview

Dimensions of the Audi A4 ‘05 Avant.

Introduction

343_010

Protected by copyright. Copying for private or commercial purposes, in part or in whole, is not
permitted unless authorised by AUDI AG. AUDI AG does not guarantee or accept any liability
with respect to the correctness of information in this document. Copyright by AUDI AG.

5

Dimensions of the Audi A4 ‘05 saloon.

343_011

Protected by copyright. Copying for private or commercial purposes, in part or in whole, is not
permitted unless authorised by AUDI AG. AUDI AG does not guarantee or accept any liability
with respect to the correctness of information in this document. Copyright by AUDI AG.

6

The body

Overview of the body

One of the key factors contributing to the vehicle's lower kerb weight was the use of high-strength body
panels, which account in total for 45% of the bodyshell weight. These special panels are used especially at the
body front end, where they are intended to absorb as effectively as possible the impact energy in the event of
a head-on collision.

In the floorpan area, the occupant cell is protected by three large tailored blanks in varying wall thickness. In
the occupant cell area, tailored blanks are connected sturdily and homogeneously to the front and rear ends
of the vehicle by a branched support system.

At the rear end of the vehicle, the side members are made from tailored blanks with different materials and
wall thickness.

Note

The repair concept is identical to that
of the Audi A4 ‘04 (B6).

Front end adapted to singleframe radiator grille

Protected by copyright. Copying for private or commercial purposes, in part or in whole, is not
permitted unless authorised by AUDI AG. AUDI AG does not guarantee or accept any liability
with respect to the correctness of information in this document. Copyright by AUDI AG.

7

Optimised body

–New exterior design
–Installation space for diesel particulate filter
–Compliance with applicable vehicle safety

requirements

B-pillar optimised for crash safety

Installation space in centre tunnel has been enlarged to
accommodate diesel particulate filter and multitronic transmission

343_008

Protected by copyright. Copying for private or commercial purposes, in part or in whole, is not
permitted unless authorised by AUDI AG. AUDI AG does not guarantee or accept any liability
with respect to the correctness of information in this document. Copyright by AUDI AG.

8

Occupant protection

Safety system

The development objective for the safety system in the Audi A4 ‘05 was clearly defined: The system must
comply with all legislation now in effect and pass all current consumer tests, not to mention meeting Audi's
stringent in-house requirements.
The safe ty system in the Audi A4 ´05 is based on the systems in the Audi A3 Sportback and Audi A6 ‘05.
The complete system, as well as the adopted components, were adapted to suit the Audi A4 ’05.

Reference

For further information about the
safety system, refer to Self-Study
Prog rammes
SSP 323 Audi A6 ´05 and
SSP 332 Audi A3 Sportback.

G284 Front airbag crash sensor, front passenger side (right front
end)

E224 Airbag disabling key switch, front passenger side

G283 Front airbag crash sensor, driver side (left front end)

N95 Airbag igniter, driver side
N250 Airbag igniter -2-, driver side

G128 Seat occupied sensor, front
passenger side

G180 Side airbag crash sensor, front passenger side (front door)

N131 Airbag igniter 1, front passenger side
N132 Airbag igniter 2, front passenger side

G179 Side airbag crash sensor, driver side (front door)

T16 16-pin connector, diagnosis connection

J623 Engine control unit

K145 Airbag disabled warning lamp, front passenger side
(PASSENGER AIRBAG OFF)

K19 Seat belt warning system warning lamp
K75 Airbag warning lamp
J285 Control unit with display in
dash panel insert

J393 Convenience system central control unit

Protected by copyright. Copying for private or commercial purposes, in part or in whole, is not
permitted unless authorised by AUDI AG. AUDI AG does not guarantee or accept any liability
with respect to the correctness of information in this document. Copyright by AUDI AG.

9

The safe ty system in the Audi A4 ´05 consists of the following components and functions:

–Airbag control unit
–Driver and front passenger airbags, two-stage
–Front side airbags
–Sideguards (head airbags)
–Side impact detection sensors on the C-pillar
–Side impact detection sensors in the front doors (pressure sensors)
–Crash sensors for intelligent head-on collision detection, so-called upfront sensors
–Front belt tensioners
–Seat belt reminders for driver and front passenger
–Switches in the front seat-belt buckles
–Seat occupied sensor, front passenger seat
–Active head restraints in the front seats
–Rear collision detection

Rear side airbags and deactivation of the front passenger front airbag by keyswitch with associated warning
lamp are available as optional extras.

In some countries, such as the North American market, deviating specifications may apply due to different
country-specific requirements.

E25 Belt switch - front passenger side

J234 Airbag control unit

E24 Belt switch - driver side

N252 Curtain airbag igniter, front passenger side

N251 Curtain airbag igniter, driver side

N154 Belt tensioner igniter -2-, front passenger side

N200 Side airbag igniter, front passenger side

G257 Rear side airbag crash sensor, front passenger side (C-pillar)

N153 Belt tensioner igniter -1-, driver side

N199 Side airbag igniter, driver side

G256 Rear side airbag crash sensor, driver side (C-pillar)

343_007

Protected by copyright. Copying for private or commercial purposes, in part or in whole, is not
permitted unless authorised by AUDI AG. AUDI AG does not guarantee or accept any liability
with respect to the correctness of information in this document. Copyright by AUDI AG.

10

Diagnosis

K-wire switch VAS 6017 B

Like in the Audi A4 ´01, K-wire switch is also required in the Audi A4 ´05 for communication between the
individual vehicle systems and the VAS testers.
Since the new control units are diagnosable via CAN only, the new K-wire switch VAS 6017 B must be used.
K-wire switch VAS 6017 B replaces switch VAS 6017 A.

Communication

If communication is to be established between a
control unit and a VAS tester, the tester sends the
appropriate address word via the diagnosis CAN
data bus.

The K -wire switch VAS 6017 B does not evaluate
signals on the diagnosis CAN data bus, rather it
relays them directly to the vehicle.

If the tester receives no response from the control
unit on the diagnosis CAN data bus, its resends the
appropriate address word, this time via the K-wire.
The K -wire switch receives this information and
relays it to the vehicle both on the K-wire and on the
L-wire.

If the control unit sends its response on the L-wire,
the K-wire switch detects this and establishes a
direct connection between the L-wire of the vehicle
and the K-wire of the tester.

As long as the tester is connected to a control unit
via the L-wire, the contact to the K-wire of the
vehicle is broken by the K-wire switch.

343_018

PIN Designation

1 Ter min al 15

2 Unassigned or assigned on US spec vehicles

3 Unassigned

4 Ter min al 31

5 Ter min al 31

6 Data bus, diagnosis CAN bus, CAN High

7 K-wire

8 Unassigned

9 Unassigned

10 Unassigned or assigned on US spec vehicles

11 Unassigned

12 Unassigned

13 Unassigned

14 Data bus, diagnosis CAN bus, CAN High

15 L lead

16 Ter min al 30

343_003