Dodge Caliber. Manual - part 529
INTRUSION MODULE
DESCRIPTION
An intrusion module (1) 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 mar-
kets, where the additional features offered by this sys-
tem are required. The intrusion module is located in
the passenger compartment. This unit is designed to
work in conjunction with the intrusion sensor transmit-
ter and intrusion sensor receiver to provide interior
motion detection and serves as the interface between
the Totally Integrated Power Module (TIPM), the Elec-
troMechanical Instrument Cluster (EMIC) (sometimes
referred to as the Cab Compartment Node (CCN), and
the alarm siren.
The intrusion module has two integral mounts (2) that
are secured by two screws underneath the instrument
panel upper cover, just above the center stack. Con-
cealed within the molded plastic housing is the cir-
cuitry of the module, which includes a microprocessor.
The module is connected to the vehicle electrical system wire harness.
The intrusion module unit cannot be adjusted or repaired and, if faulty or damaged, it must be replaced.
OPERATION
The microprocessor in the intrusion module contains the motion detection logic circuits and controls all of the fea-
tures of the premium version of the Vehicle Theft Alarm (VTA). The module uses On-Board Diagnostics (OBD) and
can communicate with other modules in the vehicle as well as with a diagnostic scan tool using the Controller Area
Network (CAN) data bus. This method of communication is used by the module to communicate with the Totally
Integrated Power Module (TIPM) and the ElectroMechanical Instrument Cluster (EMIC). The module also commu-
nicates with the alarm siren over a dedicated serial bus circuit.
The intrusion module microprocessor continuously monitors inputs from the intrusion sensor transmitter and receiver
as well as inputs from the EMIC and the alarm siren module. The module energizes the intrusion sensor transmitter,
which transmits ultrasonic signals into the vehicle cabin through a transmit transducer, then monitors the current
draw of the transmitter to detect problems with the transmitter and transmitter circuits. The module also energizes
the intrusion sensor receiver, which listens to the ultrasonic signals through a receive transducer as they bounce off
of objects in the vehicle interior, then monitors the current draw of the receiver for data signals and to detect prob-
lems with the receiver and receiver circuits. 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 from the receiver.
If movement is detected, the intrusion module sends an electronic message to the CCN over the CAN data bus to
trigger the alarm. The CCN sends the alarm message over the CAN date bus to the TIPM and intrusion module.
The intrusion module sends another message to the alarm siren module over the dedicated serial bus line to sound
the siren. When the EMIC detects a breach in the perimeter protection through a door or liftgate, it sends an elec-
tronic message to the intrusion module and the TIPM. The intrusion module sends 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
fifty ignition cycles, the module will automatically erase the stored DTC.
The intrusion module receives battery voltage on a B(+) circuit and is grounded at all times through a hard wired
remote ground point. These connections allow the module to remain operational, regardless of the ignition switch
position. To diagnose the intrusion module, the CAN data bus, and the electronic message inputs to and outputs
from the module requires the use of a diagnostic scan tool and refer to the appropriate diagnostic information.
PM
VEHICLE THEFT SECURITY - SERVICE INFORMATION
8Q - 93