Audi TT (2007 year). Manual — part 269

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.

21

391_050

391_052

Rocker

Engaging hook

Convertible top right
latch switch F170

Convertible top stowed switch F171

The signal from the convertible top stowed switch
F171 informs the convertible top operation control
unit J256 whether the convertible top is stowed in
the convertible top box or not.
The convertible top stowed switch F171 is a Hall
sensor. The sensor is located on the left main
bearing of the convertible top mechanism. When
the convertible top is stowed in the convertible top
box, a metal arm of the convertible top mechanism
is positioned directly opposite the Hall sensor.
The convertible top operation control unit J256
monitors the power supply of the Hall sensor.
If the control unit measures a voltage of approx. 9
volts, then the convertible top is stowed in the
convertible top box.
If the voltage drops to approx. 3.5 volts, the
convertible top operation control unit J256
recognises that the convertible top is no longer
stowed in the convertible top box.

Convertible top right latch switch F170

The convertible top right latch switch F170 can
be found in the lock bottom part on the right
windscreen frame.
The engaging hook of right lock top part actuates
the switch by means of a rocker.
The convertible top operation control unit J256
determines from the position of the switch whether
the convertible top lock is "closed" or "open".

The convertible top front latch switch F172 and the
convertible top right latch switch F170 are
connected in series.

Convertible top stowed switch F171

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.

22

391_053

391_056

391_057

Electrical convertible top control system

Actuating linkage
of convertible top lock
motor V223

Convertible top lock
closed switch F295
Right lock top part

Convertible top lock closed switch F295

The convertible top lock closed switch F295 is
located on the left and right lock top parts installed
in the forward roof section (tip of the roof).
The signals the convertible top operation control
unit J256 receives from the switches inform the
former whether the locks are closed or not.
This information is used, among other things, for
opening and closing the locks parallel to the
convertible top operating cycle.

The two convertible top lock closed switches F295
are connected in series.

Convertible top front switch F202

Metal arm

Convertible top front switch F202

Like the convertible top stowed switch F171, the
convertible top front switch F202 is a Hall sensor.
This switch is also located on the left main bearing
of the convertible top.
The convertible top operation control unit J256
monitors the power supply of the Hall sensor. If the
control unit measures a voltage of approx. 9 volts,
the convertible top is closed.
If the voltage drops to approx. 3.5 volts, the
convertible top operation control unit J256
concludes that the convertible top is no longer
closed.

Convertible top lock
closed switch F295
Left lock top part

Actuating linkage of convertible
top lock motor V223

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.

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391_059

Note

After repair work on the convertible top covers, convertible top cover senders G596 and G597 must
be adapted to the convertible top operation control unit J256. This can only be accomplished using
a VAS tester and the Guided Fault Finding or Guided Functions option.

391_055

Convertible top cover motor V383
with convertible top cover sender G596

Left convertible top cover sender G596
Right convertible top cover sender G597

The convertible top covers are located on the left
and right-hand sides of the convertible top box and
cover the main bearings of the convertible top
mechanism when the convertible top is open.
The convertible top covers are driven by the
convertible top cover motors V381 and V383.
Potentiometers G596 and G597 are integrated in the
convertible top cover motors to inform the
convertible top operation control unit J256 about
the actual position of the convertible top covers.

Convertible top lock motor V223

Convertible top lock open switch F294

Bracket removed

Convertible top lock open switch F294

Switch F294 is also mounted to the bracket to which
the convertible top lock motor V223 is attached.
The convertible top lock open switch F294 is
actuated by the convertible top lock linkage. In this
way, the convertible top operation control unit J256
is always informed when the convertible top lock
motor V223 is in the "open" position.

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.

24

391_073

Electrical convertible top control system

Convertible top operation control unit J256

Convertible top operation control unit J256

Automatic or fully automatic convertible top
operation is only possible using the convertible
top operation control unit J256.
The convertible top operation control unit J256
gathers information from the sensors, evaluates
this and activates the actuators.
The convertible top operation control unit J256 is
also responsible for system diagnostics.
If a faulty actuator or a sensor is identified or if the
signals from the sensors are not received in time,
the control unit stops the convertible top operating
cycle. A fault is stored in the fault memory.
In addition, the control unit monitors the operating
time of the convertible top. In order to avoid
overloading the hydraulic pump, the convertible top
operation control unit J256 deactivates the
convertible top after approx. three minutes,
provided that the convertible top is closed.

The convertible top can be operated again until a
time-out of approx. ten minutes has expired. If the
convertible top does not meet the "closed"
condition after approx. four minutes of continuous
operation, the control unit stops the convertible top
operating cycle immediately. The convertible top
cannot be operated again until a 20 minute time-out
has expired. The actuation time of the convertible
top lock motor is also used for monitoring the
operating time of the convertible top.

The convertible top operation control unit J256
is integrated in the convenience CAN bus and
exchanges data with other vehicle systems
across this bus.
The control unit is housed in the luggage
compartment under the cargo floor.