Audi TT (2007 year). Manual - part 248

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.

25

Tasks of the convenience system central 
control unit J393

The convenience system central control unit J393 
of the Audi TT Coupé ’07 is based on the 
convenience system control unit in the Audi A3 ’04. 
Its range of functions has been extended to include 
an "electrically adjustable rear spoiler" function.

Convenience system central control unit J393 has 
the following tasks:

●

Central locking master

●

Anti-theft alarm system master

●

LIN master for communication with the 
components of the antitheft alarm system 

●

Control of the "electrically adjustable rear 
spoiler"

●

Activation of the luggage compartment lights

●

Read-in of the handbrake contact switch

●

Data exchange with other control units across 
the convenience CAN bus

●

Self-diagnosis and diagnosis of connected 
components

In the Audi TT Coupé ´07, the convenience system 
central control unit J393 is located at the rear right 
on a control unit holder. It is located directly under 
the parking aid control unit J446, if installed in the 
vehicle.

Convenience system central control unit J393

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382_001

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.

26

Electrical system and convenience electronics

Electrically adjustable rear spoiler

Introduction

The Audi TT Coupé ´07 has, as standard, an "electrically adjustable rear spoiler" function. 
The extended rear spoiler provides additional driving stability when driving at high speeds.

Rear spoiler in lower end position (retracted)

Rear spoiler in upper end position (extended)

382_011

382_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.

27

Function and operation

Automatic mode

The rear spoiler is extended automatically when 
a speed of 120 kph is exceeded. When the vehicle 
speed drops below the 80 kph speed threshold 
again, the rear spoiler is retracted automatically.

Manual mode

The rear spoiler can be extended up to a speed of 120 kph by flicking the adjustable rear spoiler switch E127. 

The rear spoiler can also be retracted and extended within a road range between 20 kph and 120 kph by 
flicking the adjustable rear spoiler switch E127. The rear spoiler cannot be retracted at speeds of 120 kph or 
higher.

When driving at speeds of between 0 kph and 20 kph, the switch must be kept pressed while the rear spoiler is 
retracting. If the switch is released while the rear spoiler is retracting, the rear spoiler will stop in its 
momentary position. Actuating the switch again will cause the rear spoiler to extend again.

The adjustable rear spoiler warning lamp K242 integrated in switch E127 comes on whenever the rear spoiler 
is extended manually. As soon as the rear spoiler is retracted again or the system switches to Automatic mode 
because the vehicle is travelling faster than 120 kph, the warning lamp goes out again.

Note

When the Transport mode is 
activated, the Automatic mode is 
active and the "Manual mode" is 
deactivated.It is not possible to 
extend and retract the rear spoiler by 
actuating the adjustable rear spoiler 
switch when Transport mode is set.

382_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.

28

System behaviour in case of malfunction

A detected system malfunction is indicated to the 
driver by activating a rear spoiler warning lamp in 
the rev counter. If no fault has occurred, this 
indicator lamp comes on for 3 seconds after turning 
on the ignition and goes out again.

Electrical system and convenience electronics

382_014

In the case of the following faults, the rear spoiler is extended for safety reasons:

●

The convenience system central control unit J393 receives no road speed signal

●

The convenience system central control unit no longer receives any CAN messages

●

Implausible signals to rear spoiler adjustment limit switches 1 and 2 are detected

●

The convenience system central control unit is supplied with undervoltage (U < 10.5 V)

Note

If a fault is detected in the 
"electrically adjustable rear spoiler" 
function, the ESP can no longer be 
switched off manually. If the ESP was 
switched off at this time, it is 
reactivated automatically.