Audi TT (2007 year). Manual — part 271

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.

29

391_089

Control unit with display in dash panel insert

J285

Convertible top operation warning lamp

K215

Centre display

Dash panel insert

Convertible top operation control unit J256

Convertible top operation
hydraulic pump V118

Convertible top lock motor V223

Convertible top cover motor V381/V383

Diagnostic port

Convenience system
central control unit J393

Door control units J386/J387

Heated rear window Z1

Onboard power supply control unit J519

Convertible top convenience opening/closing

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.

30

Electrical convertible top control system

Headlight range control,

control unit

J431

ECD control unit

(electronically controlled

damping)

J250

Power output module

for right headlight

J668

Power output module

for left headlight

J667

ABS

control unit

J104

Selector lever

E313

Twin clutch

gearbox

mechatronics

J743

Engine

Control unit

J623

Airbag

control unit

J234

Four-wheel drive

control unit

J402

Tyre pressure

monitor

control unit 2

J793*

Power steering

control unit

J500

Steering angle

sender

G85

Steering column

electronics

control unit

J527

Multifunction

steering wheel

control unit

J453

Powertrain CAN bus

Infotainment CAN bus

Convenience CAN bus

Dash panel insert CAN bus

Diagnostics CAN bus

LIN bus

Subbus system

Panasonic bus

Topology and networking

On the next two pages you will find an overview of the networking of the individual control units in the
Audi TT Roadster. The convertible top operation control unit J256 is integrated in the convenience CAN bus.

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.

31

391_075

Rain and light

detector sensor

G397

Wiper motor

control unit

J400

Alarm horn

H12

Anti-theft alarm

system sensor

G578

Tyre pressure

monitor

control unit

J502**

Onboard

power supply

control unit

J519

Convenience

system central

control unit

J393

Climatronic
control unit

J255

Auxiliary air heater

control unit

J604

Convertible top

operation

control unit

J256

Parking aid

control unit

J446

Front passenger

door control unit

J387

Door control unit,

driver side

J386

TV tuner

R78

Digital sound

package

control unit

J525

Radio

R

Control unit with

display for radio

and navigation

J503

CD changer

R41

Digital satellite

radio tuner

R190

Telephone

transmitter and

receiver unit

R36

Data bus diagnostic interface

J533

Control unit with display in

dash panel insert

J285

Diagnosis connection

*

for tyre pressure monitoring system 2 only (ECE = Europe)

**

for tyre pressure monitor only (SAE = North America)

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.

32

391_076

391_054

Reference

For information on the CAN data bus,
refer to Self-Study Programme 238
"Data exchange across CAN data bus I"
and 269 "Data exchange across CAN data
bus II".

Electrical convertible top control system

Convertible top operation control unit J256

Data bus diagnostic interface J533

Data exchange

To ensure smooth operation of the convertible top,
the convertible top operation control unit J256
requires various information.
In addition to the information received from the
system's sensors, the control unit requires
information from other automotive systems,
e.g. ESP.
Other control units are also dependent on the
information supplied by the convertible top
operation control unit. This information is
exchanged across the CAN data bus.

The convertible top operation control unit is
integrated in the convenience CAN bus and sends
and receives data across this CAN bus.

Data exchange between the individual CAN data
bus systems is effected via the data bus diagnostic
interface J533.

There is an intensive and continuous exchange of
data between the individual automotive systems.

The data bus diagnostic interface is located below
the dash panel adjacent the pedal bracket. The
control unit is accessible from the driver footwell.