An intrusion sensor transmitter (2) 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. This
unit is designed to work in conjunction with the intrusion sensor receiver to provide interior motion detection inputs to the intrusion module, which
serves as the interface between the Front Control Module (FCM), the ElectroMechanical Instrument Cluster (EMIC) (also known as the Cab
Compartment Node/CCN) and the alarm siren.
The transmitter is located in the passenger compartment, where it is concealed above the headliner. A molded plastic mounting bracket with two locating
pins engages the holes in two locating tabs (4) integral to the transmitter housing and the housing is secured in place by two latch features integral to the
bracket. Only a small dedicated molded plastic transducer trim bezel that is secured by a snap fit to the tubular ultrasonic transducer housing, which
extends vertically downward from the base of the transmitter housing is visible below the right rear corner of the headliner. The trim bezel has a small
round opening that faces the front of the vehicle through which the transducer is aimed.
Concealed within the molded plastic transmitter housing is the circuitry of the transmitter which includes an ultrasonic transmit transducer (1). The
transmitter is connected through an integral connector receptacle (3) to the vehicle electrical system by a take out and connector of the overhead wire
harness that is integral to the headliner.
The intrusion sensor transmitter cannot be adjusted or repaired and, if ineffective or damaged, it must be replaced. The transmitter mounting bracket is
serviced as a unit with the headliner. The transducer trim bezel is available for separate service replacement.