Intrusion Module Sensor - Operation

OPERATION

The intrusion module microprocessor continuously monitors inputs from the intrusion sensors as well as inputs from the CCN and the alarm siren module. The alarm is activated the intrusion module energizes the intrusion sensors, the ultrasonic senors then transmits ultrasonic signals into the vehicle cabin through, then monitors the current draw to detect problems with the sensor circuits. The intrusion sensor listens to the ultrasonic signals as they bounce off of objects in the vehicle interior. If an object is moving in the interior, a detection circuit in the module senses this movement through the modulation of the returning data signals.

If movement is detected, the intrusion module sends an electronic message to the TIPM over the CAN data bus to flash the exterior lighting and sends another message to the alarm siren module over the dedicated serial bus line to sound the siren. When the CCN or TIPM detect a breach in the perimeter protection through a door, liftgate, flip-up glass, or hood ajar switch input, they send an electronic message to the intrusion module and the module sends a message to the TIPM to flash the exterior lighting and a message to the alarm siren module to sound the siren. The module also monitors message inputs from the alarm siren module for siren battery or siren input/output circuit tamper alerts, and siren battery condition alerts, then sets active and stored Diagnostic Trouble Codes (DTC) for any monitored system faults it detects. An active fault only remains for the current ignition switch cycle, while a stored fault causes a DTC to be stored in memory by the module. If a fault does not recur for 50 ignition cycles, the module will automatically erase the stored DTC.