Audi TT (2007 year). Manual — part 244

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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

382_030

Main fuse box

Onboard power supply control unit

Fuse carrier

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

Tasks

The gateway represents the interface between the
various bus systems, i.e. it facilitates
communication between the control units of various
bus systems. Every Audi TT Coupé ´07 has
a powertrain CAN bus, dash panel insert CAN,
diagnostics CAN bus, convenience CAN bus and
infotainment CAN bus.

Master functions

–

Powertrain CAN bus run-on

–

Sending the 'Sleep' command

Installation location

The gateway is installed under the dash panel
adjacent the pedal bracket and can be accessed
from the driver's footwell.

Electrical system and convenience electronics

Data bus diagnostic interface (gateway) J533

382_047

Diagnostics CAN bus

Dash panel insert CAN bus

Powertrain
CAN bus

Infotainment CAN bus

Convenience CAN bus

382_061

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.

11

Function diagram

The function diagram is identical to that of data bus
diagnostic interface as featured on the Audi A3 ´04.

The dash panel insert J285 and the data bus
diagnostic interface J533 can wake each other from
idle via the bidirectional wake-up line. The dash
panel insert CAN between the dash panel insert and
the data bus diagnostic interface is a highspeed
CAN and, unlike the convenience CAN bus, is not
wake-up capable via the CAN line.
Onboard voltage is applied to the wake-up line
when terminal 15 is "on".

This wake-up function is required to wake up the
dash panel insert CAN without "terminal 15 on" after
the CAN bus has been in idle state.
For example, to be able to display date, time and
mileage in the dash panel insert after opening the
driver's door, but before turning on the ignition.

Transport mode

The Transport mode, which keeps power
consumption to a minimum while the vehicle is
being transported, is implemented in the gateway
on the Audi TT Coupé ´07.
Transport mode can be activated and deactivated
using the diagnostic testers. This can be done both
using the Services function in the vehicle self-
diagnostics and using the gateway test plan in the
Guided Functions mode or in the Guided Fault
Finding mode.

Reference

For further information on the
Transport mode, refer to Self-Study
Programme 312.

382_062

Wake-up line

Vehicle self-diagnostics
Services
Select diagnostic function

Query fault memory - overall system
Clear fault memory - overall system
Activate Transport mode
Deactivate Transport mode

382_060

Goto

Print

Help

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.

12

Electrical system and convenience electronics

Master function for terminal 15 across the powertrain CAN-bus

As in the Audi A3 ´04, information transmitted across the powertrain CAN bus includes a run-on function.
This allows the various control units to transmit information relevant to safety even when the ignition is off.

With regard to terminal 15 run-on, there are three different groups of powertrain CAN bus control units:
Active and passive control units as well as control units without run-on.

Active control units are control units which are able to keep the powertrain CAN bus awake.

Passive control units remain awake until the gateway signals it is ready to enter Sleep mode, but cannot
independently keep the powertrain CAN bus awake.

Control units without run-on function shut off immediately after "ignition off".

without

active

Engine control unit

J623

Direct shift gearbox

mechatronics

J743

ESP control unit

J104

Power steering control unit

J500

Data bus diagnostic interface

J533

Steering angle sensor

G85

Selector lever

E313

Coding the gateway

Difference to the Audi A3 ´04

When coding the gateway, the derivative (body
version) "Coupé, sports car" must be selected for the
Audi TT Coupé ´07.

Reference

For information on coding the
gateway, refer to Self-Study
Programme 312.

382_045

passive

Four-wheel drive

control unit

J492

Headlight range control,

control unit

J431

Airbag control unit

J234

ECD control unit (electronically

controlled damping)

J250

Tyre pressure monitor

control unit 2

J793