Jeep KJ 2005 Service Manual page 646

KJ
VEHICLE THEFT SECURITY (Continued)
mode will also apply if the battery goes dead while
the system is armed, and battery jump-starting is
attempted. The VTA will be armed until the techni-
cian or vehicle operator has actively or passively dis-
armed the alarm system. If the VTA is in the
disarmed mode prior to a battery disconnect or fail-
ure, it will remain disarmed after the battery is
reconnected or replaced, or if jump-starting is
attempted.
ALARM
The VTA alarm output varies by the version of the
VTA with which the vehicle is equipped. In all cases,
the alarm provides both visual and audible outputs;
however, the time intervals of these outputs vary by
the requirements of the market for which the vehicle
is manufactured. In all cases, the visual output will
be a flashing on and off of the exterior lamps. For
vehicles equipped with the North American or the
export base version of the VTA, the audible output
will be a pulsing of the horn. For vehicles with the
export premium version of the VTA, the audible out-
put will be a cycling of the alarm siren. See the own-
er's manual in the vehicle glove box for details of the
alarm output requirements of the specific market for
which the vehicle was manufactured. The inputs that
will trigger the alarm include the door ajar switches,
the tailgate ajar switch, the flip-up glass ajar switch,
and in vehicles built for certain markets where they
are required, the hood ajar switch and the Intrusion
Transceiver Module (ITM).
TAMPER ALERT
The VTA tamper alert feature will pulse the horn
(or the alarm siren for the export premium version of
the VTA) three times upon VTA disarming, if the
alarm was triggered and has since timed-out, or if
the battery has been disconnected and reconnected.
This feature alerts the vehicle operator that the VTA
alarm was activated while the vehicle was unat-
tended.
INTRUSION ALARM
The intrusion alarm is an exclusive feature of the
export premium version of the VTA, which is only
available in certain markets where it is required.
When the VTA is armed, a motion sensor in the
Intrusion Transceiver Module (ITM) monitors the
interior of the vehicle for movement. If motion is
detected, the ITM sends an electronic message to the
BCM over the PCI data bus to invoke the visual
alarm feature, and sends an electronic message to
the alarm siren in the engine compartment over a
dedicated serial bus to invoke the audible alarm fea-
ture. The motion detect feature of the ITM can be
disabled by depressing the "Lock" button on the RKE
transmitter three times within fifteen seconds during
VEHICLE THEFT SECURITY
VTA arming, while the security indicator is still
flashing rapidly. The VTA provides a single short
siren "chirp" as an audible confirmation that the
motion detect disable request has been received.
The ITM must be electronically enabled in order
for the intrusion alarm to perform as designed. The
logic in the ITM keeps its intrusion alarm function
dormant until it is enabled using a diagnostic scan
tool. The intrusion alarm function of the ITM is
enabled on vehicles equipped with this option at the
factory, but a service replacement ITM must be con-
figured and enabled by the dealer using a diagnostic
scan tool. Refer to the appropriate diagnostic infor-
mation.
SENTRY KEY IMMOBILIZER SYSTEM
The Sentry Key Immobilizer System (SKIS) is
designed to provide passive protection against unau-
thorized vehicle use by disabling the engine after
about two seconds of running, whenever any method
other than a valid Sentry Key is used to start the
vehicle. The SKIS is considered a passive protection
system because it is always active when the ignition
system is energized and does not require any cus-
tomer intervention. The SKIS uses Radio Frequency
(RF) communication to obtain confirmation that the
key in the ignition switch is a valid key for operating
the vehicle. The microprocessor-based SKIS hard-
ware and software also uses electronic messages to
communicate with other electronic modules in the
vehicle over the Programmable Communications
Interface (PCI) data bus. (Refer to 8 - ELECTRICAL/
ELECTRONIC CONTROL MODULES/COMMUNI-
CATION - OPERATION).
Pre-programmed Sentry Key transponders are pro-
vided with the vehicle from the factory. Each Sentry
REmote Entry Module (SKREEM) will recognize a
maximum of eight Sentry Keys. If the customer
would like additional keys other than those provided
with the vehicle, they may be purchased from any
authorized dealer. These additional keys must be pro-
grammed to the SKREEM in the vehicle in order for
the system to recognize them as valid keys. This can
be done by the dealer using a diagnostic scan tool or,
if Customer Learn programming is an available SKIS
feature in the market where the vehicle was pur-
chased, the customer can program the additional
keys, as long as at least two valid Sentry Keys are
already available. (Refer to 8 - ELECTRICAL/VEHI-
CLE THEFT SECURITY - STANDARD PROCE-
DURE - TRANSPONDER PROGRAMMING).
The SKREEM performs a self-test of the SKIS
each time the ignition switch is turned to the On
position, and will store fault information in the form
of a Diagnostic Trouble Code (DTC) if a system mal-
function is detected. The SKIS can be diagnosed, and
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