Audi TT (2007 year). Manual - part 227

41

382_067

Legend

1

Garage door operation control unit J530

2

Direct shift gearbox mechatronics J743

3

Power steering control unit J500

4

Engine control unit J623

5

ABS control unit J104

6

Wiper motor control unit J400

7

Alarm horn H12

8

Onboard power supply control unit J519
Headlight range control, control unit J431

9

Data bus diagnostic interface J533

10

CD changer R41

11

Tyre pressure monitor control unit 2 J793 /
Tyre pressure monitor control unit J502*

12

Control unit with display in dash panel insert 
J285

13

Radio R
Control unit with display for radio and 
navigation J503
Climatronic control unit J255

14

Steering column electronics control unit J527
Steering angle sender G85
Multi-function steering wheel control unit 
J453

15

Rain and light detector sensor G397

16

Driver door control unit J386

17

Front passenger door control unit J387

18

Anti-theft alarm system sensor G578

19

Telephone transmitter and receiver unit R36

20

Airbag control unit J234

21

ECD control unit (electronically controlled 
damping) J250

22

Digital satellite radio tuner R190

23

Digital sound package control unit J525

24

Convenience system central control unit J393
Parking aid control unit J446
TV tuner R78

25

Radio controlled clock receiver J489

* for tyre pressure monitor only SAE

42

Air conditioning

Overview

The air conditioning system of the 
Audi TT Coupé ‘07 is an improved version of the 
system used in the Audi A3 ’04. The automatic air 
conditioning system is configured as a single-zone 
air conditioning system. The TT Coupé has only one 
climate zone with no temperature differential 
between the driver and front passenger sides.

The TT Roadster is available with a heating-only 
system, in addition to the automatic air 
conditioning system.

The TT vehicles with petrol engine have no auxiliary 
heater and, therefore, no electrical PTC heater 
element.

The Climatronic control unit J255 has a rotary knob 
for temperature selection, but no digital display.

The system has an air recirculation function, which 
can be activated either by the occupants or 
automatically as soon as the "on" conditions for air 
recirculation have been met.

The automatic air recirculation function by means of 
an air quality sensor G238 was not implemented;
no air quality sensor G238 is fitted. 

The fresh air intake duct temperature sensor G89 is 
not fitted. Information on ambient temperature is 
supplied only by the ambient temperature sensor 
G17 via CAN data bus from the dash panel insert.

Air conditioner in Audi TT  Coupé ‘07

Air recirculation flap

Air recirculation flap control motor
V113

Temperature flap 
control motor,
right
V159 

Chest vent
right

Chest vent
centre

Chest vent
left

Central flap control motor
V70

Air flow flap control motor
V71

Defroster flap

Defroster flap control motor
V107

Temperature flap control motor, left
V158

380_036

Fresh air/ ram air flap

43

Climatronic control unit J255

The setpoint for the temperature flap is set using the "Temperature" rotary knob. The rotary knob is infinitely 
variable and activates the "Maximum cool" function in the lowest setting and the "Maximum heat" function in 
the highest setting.

Automatic mode of the air conditioning system can be deactivated with the "Air flow" or "Air distribution" 
rotary knob or by pressing the DEFROST or AC key.

The air conditioner compressor of the system can be switched on or off by pressing the AC key; the LED is on 
or off. The system is active without cooling function when the air conditioner compressor is off.

The seat heater is optional equipment with the Audi TT Coupé ‘07. The three heater settings can be set by 
pressing the function keys. 

In setting 0 the seat heater is off; setting 0 cannot be selected directly from setting 3; it can only be activated 
by pressing the "Minus" key several times.

The function keys are backlit and currently active functions are indicated by integrated LEDs. The control unit 
with display in dash panel insert J285 provides the dimming signals terminal 58d for the function LEDs and 
terminal 58s for the key backlighting via CAN bus.
The LEDs of the function keys and the key backlighting cannot be switched individually.

"Temperature" rotary knob

"Air flow" rotary knob

"Air distribution" rotary knob

DEFROST function key

REAR WINDOW DEFROSTER function key

AUTO function key

AIR RECIRCULATION function key

SEAT HEATER right function key 

SEAT HEATER left function key

AC function key

380_049

44

Air conditioner compressor

Single acting wobble plate compressor with 
6 cylinders and variable delivery rate, without 
magnetic coupling, externally controlled.

The air conditioner compressor is not a carry-over 
part from the Audi A3.

The compressor stroke volume is regulated via the 
air conditioning system compressor regulating 
valve N280 by means of the PWM signal, depending 
on cooling power requirements.

Ambient temperature sensor G17

Only one ambient temperature sensor is used to 
evaluate the ambient temperature. 
The ambient temperature sensor G17 is located at 
the front end, on the right-hand side behind the 
bumper, directly in front of the condenser.
Its value is provide by the control unit with display 
in dash panel insert J285 via CAN bus. 
If the ambient temperature sensor G17 is faulty, 
the ECON function is activated. This means that the 
active cooling function is deactivated and the AC 
LED goes out.

Dash panel temperature sensor G56

The dash panel temperature sensor is integrated in 
the housing of the Climatronic control unit J255 and 
is ventilated by a suction blower. The temperature 
sensor can take on values from -50 °C to +77 °C.

The dash panel temperature sensor is deactivated if 
the temperature sensor or ventilation motor is 
faulty. An entry is made in the data memory, and the 
Climatronic control unit J255 uses saved substitute 
values depending on the temperature set at the 
control panel.

Air conditioning

Components of the air conditioning system 
in the Audi TT Coupé ‘07

380_048

380_053

Ambient temperature sensor
(directly before the condenser)

380_052

Dash panel temperature sensor

Air conditioning system

compressor regulating valve N280