•
Siren - An alarm siren is located in a hollow behind the right front splash shield, on the outer load beam of
vehicles built for sale in certain export markets where it is required equipment.
SENTRY KEY IMMOBILIZER SYSTEM
The Sentry Key Immobilizer System (SKIS) is available as factory-installed standard equipment on this model. Vehi-
cles equipped with the Vehicle Theft Alarm (VTA) are also equipped with SKIS. The SKIS provides passive vehicle
protection by preventing the engine from operating unless a valid electronically encoded key is detected in the igni-
tion lock cylinder. The SKIS used in combination with the export premium version of the VTA adds a steering shaft
lock feature that provides passive protection by preventing the vehicle from being steered unless a valid electroni-
cally encoded key is detected in the ignition lock cylinder, but is only available in vehicles manufactured for sale in
certain markets where it is required equipment.
The SKIS includes the following major components, which are described in further detail elsewhere in this service
information:
•
Sentry Key Remote Entry Module - The Sentry Key REmote Entry Module (SKREEM) is sometimes referred
to as the Wireless Control Module (WCM). The SKREEM/WCM is located on the instrument panel to the right
side of the steering column near the ignition lock cylinder housing and an integral molded plastic antenna ring
circles the ignition lock cylinder like a halo. The SKREEM/WCM and its antenna are concealed beneath an
ignition switch bezel on the instrument panel. (Refer to 8 - ELECTRICAL/VEHICLE THEFT SECURITY/SEN-
TRY KEY REMOTE ENTRY MODULE - DESCRIPTION).
•
Sentry Key Transponder - The Sentry Key transponder is contained within the Remote Keyless Entry (RKE)
transmitter integral to the head of the ignition key. (Refer to 8 - ELECTRICAL/VEHICLE THEFT SECURITY/
TRANSPONDER KEY - DESCRIPTION).
•
Security Indicator - A security indicator is integral to the ElectroMechanical Instrument Cluster (EMIC).
OPERATION
The Vehicle Theft Security System (VTSS) is divided into two basic subsystems: Vehicle Theft Alarm (VTA) and
Sentry Key Immobilizer System (SKIS). Following are paragraphs that briefly describe the operation of each of these
two subsystems.
VEHICLE THEFT ALARM
The ElectroMechanical Instrument Cluster (EMIC), sometimes referred to as the Cab Compartment Node (CCN), is
used on this model to control and integrate many of the functions and features included in the Vehicle Theft Alarm
(VTA). In the VTA system, the CCN receives inputs indicating the status of the door ajar switches, the ignition
switch, the liftgate ajar switch, and the power lock switches. In vehicles built for certain export markets where it is
required, the hood ajar switch provides a hard wired input to the Totally Integrated Power Module (TIPM) and both
the TIPM and the intrusion module provide electronic message inputs to the CCN over the Controller Area Network
(CAN) data bus. The CCN processes the information from all of these inputs, internally controls the security indi-
cator as appropriate, and sends electronic messages to the TIPM over the CAN data bus. The TIPM internally con-
trols the output to the hazard warning lamps and sends a control output to energize or de-energize the horn relay
as appropriate. On vehicles with an intrusion module, the horn output of the TIPM is supplemented by an output of
the siren module that is controlled by the intrusion module.
Following are paragraphs that briefly describe the operation of each of the VTA features. See the owner’s manual in
the vehicle glove box for more information on the features, use and operation of the VTA.
ENABLING
The CCN must have the VTA function electronically enabled in order for the VTA to perform as designed. The logic
in the CCN keeps its VTA function dormant until it is enabled using a diagnostic scan tool. The VTA function of the
CCN is enabled on vehicles equipped with the VTA option at the factory, but a service replacement CCN must be
VTA-enabled by the dealer using a diagnostic scan tool. Refer to the appropriate diagnostic information.
ARMING
Passive arming of the VTA occurs when the vehicle is exited with the key removed from the ignition switch and the
doors are locked while they are open using the power lock switch. Active arming occurs when the “Lock” button on
the Remote Keyless Entry (RKE) transmitter is depressed to lock the vehicle. For active arming to occur, the doors,
the liftgate and the flip-up glass must be closed and the ignition switch must be in the Off position when the RKE
PM
VEHICLE THEFT SECURITY - SERVICE INFORMATION
8Q - 85