Audi A5 - The Anti-Theft Alarm System

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Convenience system central control unit
The anti-theft alarm system
The anti-theft alarm system on the Audi A5 has, apart from a few minor modifications, been adopted
unchanged from the Audi TT Coupé.
New features
The networking system has undergone modifica-
tions: the alarm horn H12 and the anti-theft alarm
sensor G578 are connected to various LIN busses on
the Audi A5 together with other components which
have nothing to do with the anti-theft alarm system.
In addition, the anti-theft alarm system on the Audi
A5 requires a third ultrasonic sensor for interior
monitoring, whereas only two sensors were
required on the Audi TT Coupé. The anti-theft alarm
sensor is capable of evaluating up to 4 ultrasonic
sensors. However, 2 sensors are sufficient for
smaller vehicle interiors.
393_023
Convenience system
central
control unit
J393
Termin al 30
LIN bus
LIN bus
Convenience CAN bus
Anti-theft
alarm
sensor
G578
Alarm horn
H12
Garage
door
operating
unit
E284
Sliding sun-
roof
adjustment
control unit
J245
Humidity
sender
G355
Anti-theft alarm sensors
The anti-theft alarm sensor has the same part number as in the TT Coupé.
Nevertheless the sensor has to know what vehicle it is in, due to the different vehicle interior characteristics. It
obtains this information through the coding.