Sensor, Intrusion Module: Operation

WARNING: This page is about a different car, the 2021 Chrysler 300. However, it is still accessible from the selected car via links, so may be relevant.

The intrusion module sensor ultrasonic transducers are both completely controlled by the microcontroller of the Intrusion Transceiver Module (ITM). While the Vehicle Theft Alarm (VTA) is armed, the ITM generates ultra high frequency sound bursts into the vehicle interior and monitors the return signal input through the transducers. The ITM logic uses an algorithm to detect movement in the vehicle interior through modulation of the ultrasonic echo that occurs due to the Doppler effect.

The ITM also monitors the current draw of the sensor circuits to detect problems with the transducers or the sensor circuits and will store a Diagnostic Trouble Code (DTC) for any fault that is detected.

The hardwired circuits of the intrusion module sensor may be diagnosed using conventional diagnostic tools and procedures. Refer to the appropriate wiring information. However, conventional diagnostic methods will not prove conclusive in the diagnosis of the sensor or the electronic controls and communication between modules and other devices that provide some features of the VTA. The most reliable, efficient and accurate means to diagnose the intrusion module sensor or the electronic controls and communication related to sensor operation requires the use of a diagnostic scan tool. Refer to the appropriate diagnostic information.