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.

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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.

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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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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

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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.