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