67
Self-diagnosis
Address word for self-diagnosis: 45
The interior monitoring sensor unit only has
diagnostic capability when deactivated.
For more detailed information regarding the
anti-theft warning system/interior monitoring,
please refer to SSP 185.
Only one bi-directional communica-
tion line is used to activate and trigger
the alarm.
The sensor unit comprises a sender, a receiver
and the evaluation electronics. The sensor
unit is located behind the interior lighting in
the vehicle headliner.
In its activated state, the transmitter module
sends out sound waves at a frequency of
40 kHz (imperceptible to the human ear) and
receives the echo a short time later via the
receiver module. The evaluation electronics
detects irregularities in the ultrasonic field and
sends an “alarm“ signal to the central locking
control unit.
The anti-theft warning system LED indicates
that the system is on standby.
Electrical circuit
G209
Ultrasonic sensor for ATWS
J429
Central locking control unit
PIN1
K-diagnosis line
PIN2
Positive supply 12 V
PIN3
Earth
PIN4
Sensor signal “Activate alarm/signal“
SSP207/67
+30
G209
J429
K
2
4
1
3
Functional description
SSP207/69
