Audi TT MK1 (8N) Alarm System
Ultrasonic sensor, interior monitoring and audible alarm with radio control activation.
| Number | Function |
|---|---|
| 1 | G209 - Ultrasound sensor |
| 2 | J429 - Control unit for central locking |
| 3 | H8 - Sound alarm for anti-theft alarm device |
| 4 | E183 - Interior monitoring control |
| 5 | Horn |
The alarm is delivered acoustically through the sound alarm of the anti-theft device and optically through the turn signals. The condition for proper operation of the cabin monitoring is:
- Fully enclosed vehicle
- no additional air movement in the passenger compartment
The system does not take into account false alarms, such as
- Strike the roof or windows of the vehicle;
- Air displacements due to wind or passing vehicles;
- Temperature changes, for example due to a warming of the vehicle due to intense solar radiation;
- Noise of all kinds (warners, horns, bells).
Synoptic of the system
Functions of the sensors
G209 - Ultrasound sensor
It emits sonic waves in the activated state at a frequency that is not perceptible to the human ear and may receive sonic waves some time after the echo. The evaluation electronics detect irregularities in this ultrasonic field and deliver the "alarm" signal to the central locking control unit (J429).
J347 - Pulse sensor of the Roadster
It emits low-pulse cyclic radar pulses that it compares to an identical pulse delivered inside the aircraft. If the time taken by the radar pulse to return corresponds to the minimum time set in the control unit, it delivers the "alarm" signal to the central locking control unit (J429).
F2 - Driver-side door contactor
F3 - Door contactor - passenger side
Their signal is used by the central locking control unit (J429) to confirm that the vehicle is fully closed.
F120 - Contactor for closing the engine hood
Its signal is used by the central locking control unit (J429) to confirm that the vehicle is fully closed.
F218 - Central lock switch of the tailgate
Its signal is used by the central locking control unit (J429) to confirm that the vehicle is fully closed.
E183 - Interior monitoring control
It allows to disable the monitoring of the cabin for a closing operation.
R - Car radio
It transmits a signal if it is extracted from its housing.
R47 - Central locking and burglar alarm antenna
The anti-theft alarm system is turned off only when the vehicle is unlocked using the remote control.
J218 - Combined processor in the instrument cluster
It transmits signals, such as the disconnection of the battery, or the non-introduction of the key into the ignition after unlocking the driver's door using the key.
Functions of Actuators
H8 - Sound alarm for anti-theft alarm device
The sound alarm has a built-in battery that allows for an audible alarm even after the voltage supply is cut off.
M27 - - Door lighting G
M28 - Door lighting D
Locking lights. The flashing frequency indicates the state of indoor monitoring.
E3 - Distress signal control
Activates all the indicators when the alarm is triggered.