GF80.50-P-3023S | Triggering alarm by anti-towing sensor, function | 7.4.98 |
MODEL 215, 220 with CODE (491) USA version
MODEL 215, 220 with CODE (551a) Anti-theft alarm (ATA)
The anti-towing sensor (TS) monitors the position changes of the parked vehicle, e.g. caused by attempting to tow the vehicle away.
Function prerequisites
An alarm can only be triggered by the TS when
the anti-theft alarm (ATA) and the TS are activated and
the TS function is not switched off.
When the trunk lid is opened by the remote trunk release (RTR) the alarm is not triggered by the TS as long as the trunk lid is open.
Function sequence
The rear SAM control module (N10/8) checks several times per second the input to which the ATA inclination sensor (B33) is connected. If a ground signal is connected to this input for longer than 1.3 s the overhead control panel control module (N70) transmits the message "Alarm triggered by TS" to the CAN bus. The front left SAM control module (N10/6) triggers an optical and acoustic alarm.
The TS function can trigger max. three alarms in sequence. Then the ATA must be reactivated for continuation of this function.
Resetting the ATA inclination sensor (B33)
After TS activation the ATA inclination sensor (B33) can be reset by momentarily interrupting the power supply.
For this purpose the ATA inclination sensor (B33) is supplied with power by the anti-towing sensor relay (K40/5kR). This relay operates as a normally closed contact; as long as the relay coil is not under power the ATA inclination sensor (B33) is supplied with power.
Approx. 10 s following activation of the TS the relay coil is supplied with power by the rear SAM control module (N10/8) for 2 - 5 s. This opens the relay contact and interrupts the power supply to the ATA inclination sensor (B33) for this time.