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

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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

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Diagnostics CAN bus

Dash panel insert CAN bus

Powertrain 
CAN bus

Infotainment CAN bus

Convenience CAN bus

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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.

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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

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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. 

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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