Grand Cherokee 2WD Limited V8-4.7L (2002)
Alarm Module: Description and Operation
INTRUSION TRANSCEIVER MODULE
Fig.5 Intrusion Transceiver Module
An Intrusion Transceiver Module (ITM) is part of the premium version of the Vehicle Theft Alarm (VTA) in the Vehicle Theft Security System
(VTSS). The premium version of the VTA is only available in vehicles built for certain markets, where the additional features offered by this
system are required. The ITM is located in the passenger compartment. This unit is designed to provide interior motion detection, and serve as an
interface between the Body Control Module (BCM) and the alarm siren module.
Fig.6 Intrusion Transceiver Module
The ITM is concealed beneath a dedicated molded plastic trim cover that approximates the size and shape of a typical dome lamp housing.
However, rather than a lens, the ITM features three sets of louvered openings. One set of louvered openings is located at each outboard end of the
center rib, while the third set is centered. Each of the louvered openings is covered on the inside by a sight shield that extends the length of the
center rib. The module is secured to a mounting bracket above the headliner.
Concealed within the housing is the circuitry of the ITM which includes a microprocessor, and an ultrasonic receive transducer. Both the transmit
transducer on the right side of the module and the receive transducer on the ITM circuit board are aimed through two small round holes in the sight
shield of the trim cover. The ITM is connected to the vehicle electrical system by a take out and connector of the overhead wire harness that is
integral to the headliner.
The ITM unit cannot be adjusted or repaired and, if faulty or damaged, it must be replaced. The ITM is serviced as a unit with the trim cover.
