Liberty 4WD L4-2.4L DOHC VIN 1 (2005)
Alarm Module: Description and Operation
Intrusion Transceiver Module
An Intrusion Transceiver Module (ITM) is part of the export premium version of the Vehicle Theft Alarm (VTA) in the Vehicle Theft Security System
(VTSS). The export premium version of the VTA is only available in vehicles built for certain export markets, where the additional features offered by
this system are required. The ITM is located in the passenger compartment, on the lower surface of the headliner near the center of the vehicle. This
component is designed to provide interior motion detection, and serve as an interface between the Body Control Module (BCM) and the alarm siren
module.
Intrusion Transceiver Module
The ITM is concealed beneath a molded plastic trim cover that approximates the size and shape of a typical dome lamp housing. Rather than a lens, the
ITM features three sets of louvered openings. Each of the louvered openings is covered on the inside by a single molded black plastic sight shield that
extends the length of the center rib for appearance. The module is secured to a molded plastic mounting bracket above the headliner. Besides the ITM,
the trim cover also conceals two plastic pins integral to the mounting bracket that are used to secure the bracket to the headliner with two stamped nuts
that are installed from below. An adhesive-backed foam pad is installed above the ITM bracket between the headliner and the roof panel to provide
additional headliner stabilization and support for the ITM mounting. Two small notch-like service holes on the rear edge of the trim cover afford access
to the two integral rear latches of the ITM for service removal.
Concealed within the housing is the electronic circuitry of the ITM which includes a microprocessor, and an ultrasonic receive transducer. A molded
plastic connector containing six terminal pins that is soldered to a small circuit board and extends through a clearance hole in the left front corner of the
