Audi TT (2007 year). Manual - part 250

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.

33

Parking aid control unit J446

Introduction

The Audi TT Coupé ´07 is equipped for the first time with an acoustic parking system with ultrasonic sensors 
as featured previously in other Audi models. A 4-channel rear acoustic parking system is available as optional 
equipment. 
The term "4-channel rear acoustic parking system" means that 4 acoustic parking sensors which monitor the 
area behind the vehicle are integrated in the rear bumper cover. 

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The acoustic parking system control unit J446 is 
a carry-over part from the Audi A3 ‘04. Both the 
hardware and the software are identical. 
The systems in the Audi TT Coupé ´07 and in the 
Audi A3 ’04 (different installation positions of the 
acoustic parking sensor in the rear bumper) are 
differentiated by the software based on the control 
unit coding.

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In the Audi TT Coupé ´07, the acoustic parking 
system control unit is located at the rear right on 
a control unit holder. It is arranged above the 
convenience electronics central control unit J393.

Acoustic parking system control unit J446

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.

34

Electrical system and convenience electronics

Acoustic parking system adjustment options

In the Audi TT Coupé ´07, the volume and pitch (frequency) of the acoustic parking system can, for the first 
time, be adjusted via the "Extended convenience menu" in the control unit with display in dash panel insert. 

Alternatively, these settings can be made at the service centre using the diagnostic tester. There are 
appropriate adaption channels in the acoustic parking system control unit for this purpose.

The relevant menu can be accessed as follows:

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So-called fifth-generation acoustic parking sensors 
are used in the Audi TT Coupé ´07.This generation of 
sensors was used for the first time by Audi in the 
Audi Q7. These sensors are much smaller than the 
fourth generation sensors and no longer have a 
fixed plastic housing which accommodates the 
oscillating membrane.

It has been replaced by an expandable decoupling 
ring, which is fitted on the ultrasonic sensor. 
The decoupling ring must be removed to paint the 
acoustic parking sensor.

Acoustic parking sensor of the acoustic parking system

DISPLAY TYPE

>SET

QUERY
MENU OFF

SET

WIPER
WINDOW
DOORS

>ACOUSTIC 
PARKING SYSTEM

ACOUSTIC PARKING 
SYSTEM

>REAR

REAR

VOLUME
1 2 3 4 5
PITCH

>1 2 3 4 5

HELP

BACK

BACK

BACK

3-pin connector

Oscillating membrane 
for transmitting and 
receiving ultrasound

Decoupling ring

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.

35

System overview 

The following lines lead to the acoustic parking system control unit:

●

2 lines from the convenience CAN bus

●

3 lines to the power supply

●

2 lines for the rear parking aid warning buzzer H15

●

3 lines to each of the 4 acoustic parking sensors (2 lines for power supply and one digital signal line 
for data exchange) 

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Rear parking aid 

warning buzzer

H15

Acoustic parking system control unit

J446

C

o

nv

en

ien

c

e C

A

N

 bus H

igh

C

o

nv

en

ien

c

e C

A

N

 bus Lo

w

Te

rm

in

a

l 3

0

Te

rm

in

a

l 1

5

Te

rm

in

a

l 3

1

G203

G204

G205

G206

Acoustic parking sensor in rear bumper cover

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.

36

Infotainment

Chorus, concert and symphony radios in 2-DIN housing

Tuner

RDS FM/AM radio

Display of stored station with RDS name display

FM tuner with phase diversity

Internal and external drives

Internal CD drive, CD text capable: information stored on the audio CD about the artist and title is 
shown on the display 
The internal drive in the concert and symphony radios is MP3 compatible.

Control of an optional auxiliary 6-disc CD changer or an optional auxiliary iPod adaptor

A new generation of radios is used in the Audi TT Coupé ‘07. 
The main new features are an FM tuner with phase diversity as well as MP3 compatible CD drives in the 
concert and symphony radios.

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Specifications - all radios