Audi TT Roadster, Service Training

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Interior monitor
Overhead module with anti-theft alarm sensor G578
Microphone Infrared transmitter Anti-theft alarm system sensor Infrared receiver Microphone
Interior light,
front passenger side Overhead module connector
(interior light) Connector of the antitheft
alarm system sensor Interior light,
driver's side
The anti-theft alarm sensor G578 is again integrated
in the overhead module. Both the sensor G578 and
the overhead module are parts adopted from the
TT Coupé ´07.
Despite the use of identical components, the anti-
theft alarm sensor G578 must know what vehicle it
is installed in.
This information is provided by a bit using the
coding of the convenience system central control
unit J393, which differentiates between the
TT Coupé and the TT Roadster.
If the convertible top is closed and one of the
windows in the vehicle is open, the anti-theft alarm
can be activated, but will operate at a lower
sensitivity level. With regard to the functional principle of the anti-
theft alarm, please note that the alarm system
cannot be activated unless the convertible top is
closed.
Anti-theft alarm system
The TT Roadster ´07 has adopted the anti-theft
alarm sensor G578 from the TT Coupé ´07.
This sensor incorporates both the interior
monitoring sensors and the tilt sensor.
The interior monitoring sensors of the
TT Roadster ´07 now use ultrasound.
The predecessor model of the TT Roadster
used microwaves.