Technical Service Training EX 371 I/VK-5Status: 03/01 Page 1 A few characteristics of a CAN bus network Very fast data transfer among all participating

Technical Service TrainingEX371

I/VK-5 Status: 03/01Page 1

A few characteristics of a CAN bus network

• Very fast data transfer among all participating control units possible.

Drivetrain bus – 500 kBaud, convenience bus – 100 kBaud In comparison, ISDN - 64 kBit/second However, sections of the CAN data bus protocol do not contain

relevant information. Therefore this rule is applicable: 100 kBaud (convenience bus)

correspond to 64 kBit ISDN. (Baud was named after J.M.E Baudot)

• Use of common sensors by participating control units

• Simplification of wiring and smaller control units result in space saving.

If one participant fails, the bus structure remains fully available for all other bus participants.

Exception: If the engine control unit is faulty, no data can be transferred becausethe matching resistor of the drivetrain databusis integrated into the control unit.

CAN data bus network(CAN – Controller Area Network)

To prevent electromagnetic interference to data transfer,two data bus wires are twisted into a pair.At the same time, radiated interference from the data bus wire is prevented.



Left turn signalRight turn signal

A4 2001

J 285

M1 M4 M2 M3

J 519

X

J 527

Con

veni

ence

CA

N b

us

E 158

DP

E 1E 2

M1 M4M2 M3 X

J 21858ri

58 ri

58 58le

58 le

58

58 ri58 le

P

DP

S

58

S S

Wiring

A4 Predecessor

For example, parking lights

maximum 45 wires 9 plugs 60 wiring variations

maximum 17 wires 2 plugs 2 wiring variations



CAN data bus network participating components

Drivetrain CAN bus

Convenience CAN bus

Display CAN bus



CAN data bus network participating components - diagnosis

VAS 6017

K wire

L wire

Diagnosis system



Central wiring connections

A-pillar, left

Convenience data bus (orange-green)

Information data bus (orange-violet)

Drivetrain data bus(orange-black)

A-pillar, right

J234 G85

J217

J285J104

J220

CAN data bus network



CAN data bus network Gateway in dash panel insert

Control unit forautomatic gearbox J217

Convenience system central control unit J393

Control unit for 4LV J537

Diagnosis interface fordata bus in dash panel insert J285

Control and display unitfor air conditioner/Climatronic E87

Data telegram

The tasks of gateway in dash panel insert include enabling data exchange amongthe three CAN bus participantsDrivetrainConvenience andDisplay (Infotainment). Direct communication among these subsystems is not possibledue to the differing transfer speeds.



Multi-function steering wheel control unit - J453 with operating unit - E221

Steering column switch module

Ignition/starter switch - D

Steering column switch module



Steering column electronics control unit - J527

Turn signal, high beam and headlight flasher switch - E2

CCS switch - E45

Ignition/starter switch - D

Windscreen wiper switch - E

Coil connector with steering angle sender - G85

Multi-function steering wheel control unit - J453 with operating unit - E221

Steering column switch moduleComponents



Voltage codingWiper switch



Address word -16

Steering wheel electronics

The multi-function steering wheel control unit is interrogated via steering wheel electronics.

!

Steering column switch moduleDiagnosis

Convenience system central control unit - J393

Communication with the convenience data bus takes placevia the central convenience electronics because there is no separate K wire to the vehicle electrical system. Therefore, an intact convience electronics system isabsolutely essential for performing self-diagnosis.

K wire



Steering column switch moduleDiagnosis Adaptation 10 channel 81

• Enabling vehicle ID number block (using VAS 5051) following exchange between vehicles.• New parts will be marked with vehicle ID number only when put into service. (With the exception of the gateway)



The multi-function steering wheel

Tiptronic operation(both sides)

Horn operation

Operation of radio, telephone and speech operating system(depending on equipment)

A

B

C

D

E

F



D

E

F

Button functions

B

A

C

TelephoneTIMCD CassetteRadioButton

Establish connectionAccept connection End

connectionActivate/deactivate SOS

not available with F1

Activation ofSOS

Activation ofSOS or

loadnext CD

Activation ofSOS or

music seachforward

Activation ofSOS or

station buttonforward

F/F1

Reducehands-free speaking

volume

Reducevolume

Reducevolume

Reducevolume

Reducevolume

E

Raisehands-free speaking

volume

Raisevolume

Raisevolume

Raisevolume

Raisevolume

D

Switch betweenAudio mode

or not available with C1

Switch betweenphone and radio

orprevious message


orprevious CD/MD


ormusic search

backward


orstation button

backward

C/C1

Browse index backward(alphabetically)

Browse messages backward

Previous trackFast reverseSearchbackward

B

Browse index forward(alphabetically)

Browse messages forward

Next trackFast forwardSearchforward

A

F1

C1



Steering wheel functionsMaximum equipment



Steering wheel functionsBasic equipment



J 519

Con

veni

e nce

CA

N b

u s

J 507

E 3

E 1

J 527

J 345

J 59

J 4

J 285

Wipe and wash system

Lighting system

Voltage supply

H2 / H7

Vehicle electrical system control unit

• Second wipe• Overload switch off

• Lane change flash• Emergency lighting



Vehicle electrical system control unit Differentiation - lighting system

• Light control via semi-conductors• Parking light, right• Parking light, left• High beam, right• High beam, left• Turn signal, right• Turn signal, left• Number plate light

• as Low Line but with more extensive control

• Parking light, front right• Parking light, front left• Parking light, rear right• Parking light, rear left• Turn signal, front right• Turn signal, front left• Turn signal, rear right• Turn signal, rear left• Side turn signal, right• Side turn signal, left• Dipped beam, right• Dipped beam, left• Main beam, right• Main beam, left• Fog light, right• Fog light, left• Rear fog light• Brake light, right• Brake light, left• 3rd brake light • Number plate light • Reversing light, right• Reversing light, left

Low

Lin

e

Hig

h Li

ne



Vehicle electrical system control unit Differentiation - lighting system

*In the “low line“ versions, components marked with an asterisk are connected to the lighting units via conventional fuses.

Parking light

Dipped beams*

Fog lights*

Rear fog light*

Parking light

Main beams

Headlight flasher

Vehicle electricalsystem control unit J519

Light control in the “high line” version is communicated via the convenience data bus from the steering column switch module or directly from the rotary light switch to the vehicle electrical system control unit.



Address word - 09

Electronic central electrical system or

Vehicle electrical system(High Line / Low Line)

Low

/ H

igh

Line

Vehicle electrical system control unit Diagnosis

Convenience systemcentral control unit – J393

Communication with the convenience data bus takes place via the central convenience electronics because there is no separate K wire leading to the vehicle electrical system control unit.Therefore, it is absolutely necessary for self-diagnosis that the convenience electronics are intact.

K wire



D

J453J527

Convenience CAN

Information CAN

R94

R99

J526

Audi NavigationNavigation system BNS 4.0 (previously Navigation IV)

• Further development of navigation system III• Spoken information output via radio and display via management information system (MIS)• Dynamic navigation possible (TMC)• Audi logbook optional equipment

E 264

J285



Audi NavigationNavigation system RNS 4.1 (previously Navigation Plus)

• Further development of navigation II• Initially interface for navigation • Dynamic navigation possible (TMC)• Data bus networking with other control units• Audi logbook optional equipment

D

J453J527

Convenience CAN

Information CAN

R94

R99

J526

E 264

J285



Aerial

Mobile phoneFreisprechmikrofon

Telematics control unit interface

Radio

Hands-free

loudspeaker

Loudspeakers

Combi-instrument

Press-and-turncontrol device

Telephone system

Telephone system permanent installation with Nokia 6091

Hands-free loudspeaker only in vehicles with Bose sound system

Hands-free microphone



Audi telematics The components

Emergency loudspeakerCombi-processor

Diagnosis connection

Diagnosis connection

Emergency aerial

Aerial

Radio

Microphone

Speech operating system

Operating unit

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Technical Service Training EX 371 I/VK-5Status: 03/01 Page 1 A few characteristics of a CAN bus network Very fast data transfer among all participating