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XJ VEHICLE THEFT/SECURITY SYSTEMS 8Q - 1
VEHICLE THEFT/SECURITY SYSTEMS
GENERAL INFORMATION DIAGNOSIS AND TESTING
INTRODUCTION . . . . . . . . . . . . . . . . . . . . . . . . . 1 SENTRY KEY IMMOBILIZER SYSTEM . . . . . . . . 3
SENTRY KEY IMMOBILIZER SYSTEM . . . . . . . . 1 SERVICE PROCEDURES
DESCRIPTION AND OPERATION SENTRY KEY IMMOBILIZER SYSTEM
SENTRY KEY IMMOBILIZER MODULE . . . . . . . . 1 TRANSPONDER PROGRAMMING . . . . . . . . . . 4
SENTRY KEY IMMOBILIZER SYSTEM REMOVAL AND INSTALLATION
INDICATOR LAMP . . . . . . . . . . . . . . . . . . . . . . 3 SENTRY KEY IMMOBILIZER MODULE . . . . . . . . 4
SENTRY KEY IMMOBILIZER TRANSPONDER . . 2
GENERAL INFORMATION and any stored DTC can be retrieved using a DRB
scan tool as described in the proper Diagnostic Pro-
INTRODUCTION cedures manual.
The Sentry Key Immobilizer System (SKIS) is
available factory-installed optional equipment for this DESCRIPTION AND OPERATION
model. Following are some general descriptions of the
features and components of the SKIS. Refer to the
SENTRY KEY IMMOBILIZER MODULE
vehicle owner's manual for more information on the
The Sentry Key Immobilizer Module (SKIM) con-
use and operation of the SKIS. Refer to 8W-30 - Fuel/
tains a Radio Frequency (RF) transceiver and a cen-
Ignition System in Group 8W - Wiring Diagrams for
tral processing unit, which includes the Sentry Key
complete circuit descriptions and diagrams.
Immobilizer System (SKIS) program logic. The SKIS
programming enables the SKIM to program and
SENTRY KEY IMMOBILIZER SYSTEM retain in memory the codes of at least two, but no
The Sentry Key Immobilizer System (SKIS) is
more than eight electronically coded Sentry Key
designed to provide passive protection against unau-
transponders. The SKIS programming also enables
thorized vehicle use by preventing the engine from
the SKIM to communicate over the Chrysler Collision
operating while the system is armed. The primary
Detection (CCD) data bus network with the Power-
components of this system are the Sentry Key Immo-
train Control Module (PCM), the instrument cluster
bilizer Module (SKIM), the Sentry Key transponder,
and/or the DRB scan tool.
the SKIS indicator lamp, and the Powertrain Control
The SKIM transmits and receives RF signals
through a tuned antenna enclosed within a molded
The SKIM is installed on the steering column near
plastic ring formation that is integral to the SKIM
the ignition lock cylinder. The transponder is located
housing. When the SKIM is properly installed on the
under the molded rubber cap on the head of the igni-
steering column, the antenna ring is oriented around
tion key. The SKIS indicator lamp is located in the
the circumference of the ignition lock cylinder hous-
ing. This antenna ring must be located within eight
The SKIS includes two valid Sentry Key transpon-
millimeters (0.31 inches) of the Sentry Key in order
ders from the factory. If the customer wishes, addi-
to ensure proper RF communication between the
tional non-coded blank Sentry Keys are available.
SKIM and the Sentry Key transponder.
These blank keys can be cut to match a valid ignition
For added system security, each SKIM is pro-
key, but the engine will not start unless the key tran-
grammed with a unique "Secret Key" code and a
sponder is also programmed to the vehicle. The SKIS
security code. The SKIM keeps the "Secret Key" code
will recognize no more than eight valid Sentry Key
in memory and sends the code over the CCD data
transponders at any one time.
bus to the PCM, which also keeps this code in its
The SKIS performs a self-test each time the igni-
memory. The SKIM also sends the "Secret Key" code
tion switch is turned to the On position, and will
to each of the programmed Sentry Key transponders.
store Diagnostic Trouble Codes (DTCs) if a system
The security code is used by the assembly plant to
malfunction is detected. The SKIS can be diagnosed,
access the SKIS for initialization, or by the dealer
8Q - 2 VEHICLE THEFT/SECURITY SYSTEMS XJ
DESCRIPTION AND OPERATION (Continued)
technician to access the system for service. The Procedures manual are required. The SKIM cannot
SKIM also stores in its memory the Vehicle Identifi- be repaired and, if faulty or damaged, the unit must
cation Number (VIN), which it learns through a CCD be replaced.
data bus message from the PCM during initializa-
tion. SENTRY KEY IMMOBILIZER TRANSPONDER
The SKIM and the PCM both use software that The Sentry Key Immobilizer System (SKIS) uses a
includes a rolling code algorithm strategy, which transponder that is integral to each of the two igni-
helps to reduce the possibility of unauthorized SKIS tion keys that are supplied with the vehicle when it
disarming. The rolling code algorithm ensures secu- is shipped from the factory. The transponder chip is
rity by preventing an override of the SKIS through insulated within a nylon mount inserted in the head
the unauthorized substitution of the SKIM or the of the key, and invisible beneath a molded rubber cap
PCM. However, the use of this strategy also means (Fig. 1).
that replacement of either the SKIM or the PCM
units will require a system initialization procedure to
restore system operation.
When the ignition switch is turned to the On or
Start positions, the SKIM transmits an RF signal to
excite the Sentry Key transponder. The SKIM then
listens for a return RF signal from the transponder
of the Sentry Key that is inserted in the ignition lock
cylinder. If the SKIM receives an RF signal with
valid "Secret Key" and transponder identification
codes, the SKIM sends a "valid key" message to the
PCM over the CCD data bus. If the SKIM receives
an invalid RF signal or no response, it sends "invalid
key" messages to the PCM. The PCM will enable or
disable engine operation based upon the status of the
The SKIM also sends messages to the instrument
cluster over the CCD data bus network to control the
SKIS indicator lamp. The SKIM sends messages to
the instrument cluster to turn the lamp on for about
Fig. 1 Sentry Key Immobilizer Transponder
three seconds when the ignition switch is turned to
the On position as a bulb test. After completion of Each Sentry Key transponder has a unique tran-
the bulb test, the SKIM sends bus messages to keep sponder identification code programmed into it by the
the lamp off for a duration of about one second. Then manufacturer. The Sentry Key Immobilizer Module
the SKIM sends messages to turn the lamp on or off (SKIM) has a unique "Secret Key" code programmed
based upon the results of the SKIS self-tests. If the into it by the manufacturer. When a Sentry Key
SKIS indicator lamp comes on and stays on after the transponder is programmed into the memory of the
bulb test, it indicates that the SKIM has detected a SKIM, the SKIM learns the transponder identifica-
system malfunction and/or that the SKIS has become tion code from the transponder, and the transponder
inoperative. learns the "Secret Key" code from the SKIM. Each of
If the SKIM detects an invalid key when the igni- these codes is stored within the transponder and in
tion switch is turned to the On position, it sends the nonvolatile memory of the SKIM. Therefore,
messages to the instrument cluster to flash the SKIS blank keys for the SKIS must be programmed by and
indicator lamp. The SKIM can also send messages to into the SKIM, in addition to being cut to match the
the instrument cluster to flash the lamp and to gen- mechanical coding of the ignition lock cylinder. See
erate a single audible chime tone. These functions Sentry Key Immobilizer System Transponder Pro-
serve as an indication to the customer that the SKIS gramming in this group for more information.
has been placed in its "Customer Learn" program- The Sentry Key transponder is within the range of
ming mode. See Sentry Key Immobilizer System the SKIM transceiver antenna ring when it is
Transponder Programming in this group for more inserted in the ignition lock cylinder. When the igni-
information on the "Customer Learn" programming tion switch is turned to the Start or On positions, the
mode. SKIM transceiver issues a Radio Frequency (RF) sig-
For diagnosis or initialization of the SKIM and the nal that excites the transponder chip. The transpon-
PCM, a DRB scan tool and the proper Diagnostic der chip responds by issuing an RF signal containing
its transponder identification code and the "Secret
XJ VEHICLE THEFT/SECURITY SYSTEMS 8Q - 3
DESCRIPTION AND OPERATION (Continued)
Key" code. The SKIM transceiver compares the tran- DIAGNOSIS AND TESTING
sponder codes with the codes stored in its memory to
determine whether a valid key is in the ignition lock SENTRY KEY IMMOBILIZER SYSTEM
The Sentry Key transponder cannot be repaired WARNING: ON VEHICLES EQUIPPED WITH AIR-
and, if faulty or damaged, it must be replaced. BAGS, REFER TO GROUP 8M - PASSIVE
RESTRAINT SYSTEMS BEFORE ATTEMPTING ANY
SENTRY KEY IMMOBILIZER SYSTEM STEERING WHEEL, STEERING COLUMN, OR
INDICATOR LAMP INSTRUMENT PANEL COMPONENT DIAGNOSIS OR
The Sentry Key Immobilizer System (SKIS) indica- SERVICE. FAILURE TO TAKE THE PROPER PRE-
tor lamp gives an indication when the SKIS is faulty CAUTIONS COULD RESULT IN ACCIDENTAL AIR-
or when the vehicle has been immobilized due to the BAG DEPLOYMENT AND POSSIBLE PERSONAL
use of an invalid ignition key. The lamp is controlled INJURY.
by the instrument cluster circuitry based upon mes-
sages received from the Sentry Key Immobilizer
NOTE: The following tests may not prove conclu-
Module (SKIM) on the Chrysler Collision Detection
sive in the diagnosis of this system. The most reli-
(CCD) data bus.
able, efficient, and accurate means to diagnose the
The SKIM sends messages to the instrument clus-
Sentry Key Immobilizer System involves the use of
ter to turn the lamp on for about three seconds when
a DRB scan tool. Refer to the proper Diagnostic
the ignition switch is turned to the On position as a
Procedures manual for the procedures.
bulb test. After completion of the bulb test, the SKIM
sends bus messages to keep the lamp off for a dura- The Sentry Key Immobilizer System (SKIS) and
tion of about one second. Then the SKIM sends mes- the Chrysler Collision Detection (CCD) data bus net-
sages to the instrument cluster circuitry to turn the work should be diagnosed using a DRB scan tool.
lamp on or off based upon the results of the SKIS The DRB will allow confirmation that the CCD data
self-tests. If the SKIS indicator lamp comes on and bus is functional, that the Sentry Key Immobilizer
stays on after the bulb test, it indicates that the Module (SKIM) is placing the proper messages on the
SKIM has detected a system malfunction and/or that CCD data bus, and that the Powertrain Control Mod-
the SKIS has become inoperative. ule (PCM) and the instrument cluster are receiving
If the SKIM detects an invalid key when the igni- the CCD data bus messages. Refer to the proper
tion switch is turned to the On position, it sends Diagnostic Procedures manual for the procedures.
messages to the instrument cluster to flash the SKIS Refer to 8W-39 - Vehicle Theft Security System in
indicator lamp. The SKIM can also send messages to Group 8W - Wiring Diagrams for complete circuit
the instrument cluster to flash the lamp and to gen- descriptions and diagrams.
erate a single audible chime tone. These functions (1) Check the fuses in the fuseblock module. If OK,
serve as an indication to the customer that the SKIS go to Step 2. If not OK, repair the shorted circuit or
has been placed in its "Customer Learn" program- component as required and replace the faulty fuse.
ming mode. See Sentry Key Immobilizer System (2) Disconnect and isolate the battery negative
Transponder Programming in this group for more cable. Unplug the wire harness connector at the
information on the "Customer Learn" programming SKIM. Check for continuity between the ground cir-
mode. cuit cavity of the SKIM wire harness connector and a
The SKIS indicator lamp uses a replaceable incan- good ground. There should be continuity. If OK, go to
descent bulb and bulb holder on the instrument clus- Step 3. If not OK, repair the open circuit to ground
ter electronic circuit board. Refer to Group 8E - as required.
Instrument Panel Systems for diagnosis and service (3) Connect the battery negative cable. Check for
of a faulty SKIS indicator lamp. If the SKIS indicator battery voltage at the fused B(+) circuit cavity of the
lamp comes on and stays on after the bulb test func- SKIM wire harness connector. If OK, go to Step 4. If
tion, diagnosis of the SKIS should be performed with not OK, repair the open circuit to the fuse in the
a DRB scan tool and the proper Diagnostic Proce- fuseblock module as required.
8Q - 4 VEHICLE THEFT/SECURITY SYSTEMS XJ
DIAGNOSIS AND TESTING (Continued)
(4) Turn the ignition switch to the On position. SKIS indicator lamp will stop flashing and stay on
Check for battery voltage at the fused ignition switch solid for about three seconds to indicate that the
output (run/start) circuit cavity of the SKIM wire blank Sentry Key transponder has been successfully
harness connector. If OK, use a DRB scan tool and programmed. The SKIS will immediately return to
the proper Diagnostic Procedures manual to complete normal system operation following exit from the
the diagnosis of the SKIS. If not OK, repair the open "Customer Learn" programming mode.
circuit to the fuse in the fuseblock module as (7) Go back to Step 2 and repeat this process for
required. each additional Sentry Key transponder blank to be
If any of the above steps is not completed in the
SERVICE PROCEDURES proper sequence, or within the allotted time, the
SKIS will automatically exit the "Customer Learn"
SENTRY KEY IMMOBILIZER SYSTEM programming mode. The SKIS will also automatically
TRANSPONDER PROGRAMMING exit the "Customer Learn" programming mode if it
Two programmed Sentry Key transponders are sees a non-blank Sentry Key transponder when it
included with the Sentry Key Immobilizer System should see a blank, if it has already programmed
(SKIS) when it is shipped from the factory. The Sen- eight valid Sentry Keys, or if the ignition switch is
try Key Immobilizer Module (SKIM) can be pro- turned to the Off position for more than about fifty
grammed to recognize up to six additional seconds.
transponders, for a total of eight Sentry Keys. The
following "Customer Learn" programming procedure
for the programming of additional transponders REMOVAL AND INSTALLATION
requires access to at least two of the valid Sentry
Keys. If two valid Sentry Keys are not available, Sen- SENTRY KEY IMMOBILIZER MODULE
try Key programming will require the use of a DRB
WARNING: ON VEHICLES EQUIPPED WITH AIR-
scan tool and the proper Diagnostic Procedures man-
BAGS, REFER TO GROUP 8M - PASSIVE
RESTRAINT SYSTEMS BEFORE ATTEMPTING ANY
CUSTOMER LEARN STEERING WHEEL, STEERING COLUMN, OR
(1) Obtain the additional Sentry Key transponder INSTRUMENT PANEL COMPONENT DIAGNOSIS OR
blank(s) that are to be programmed for the vehicle. SERVICE. FAILURE TO TAKE THE PROPER PRE-
Cut the additional Sentry Key transponder blanks to CAUTIONS COULD RESULT IN ACCIDENTAL AIR-
match the ignition lock cylinder mechanical key BAG DEPLOYMENT AND POSSIBLE PERSONAL
(2) Insert one of the two valid Sentry Key tran-
(1) Disconnect and isolate the battery negative
sponders into the ignition switch and turn the igni-
tion switch to the On position.
(2) Remove the knee blocker from the instrument
(3) After the ignition switch has been in the On
panel. See Knee Blocker in Group 8E - Instrument
position for about three seconds, but no more than
Panel Systems for the procedures.
fifteen seconds later, cycle the ignition switch back to
(3) Insert the key in the ignition lock cylinder and
the Off position. Replace the first valid Sentry Key in
turn the ignition switch to the On position.
the ignition lock cylinder with the second valid Sen-
(4) Insert a small screwdriver or pin punch
try Key and turn the ignition switch back to the On
through the access hole in the lower steering column
shroud and depress the ignition lock cylinder retain-
(4) About ten seconds after the completion of Step
ing tumbler (Fig. 2).
3, the SKIS indicator lamp will start to flash and a
(5) While holding the retaining tumbler depressed,
single audible chime tone will sound to indicate that
pull the ignition lock cylinder and key out of the igni-
the system has entered the "Customer Learn" pro-
tion lock housing.
(6) Remove the three screws that secure the lower
(5) Within about fifty seconds of entering the "Cus-
steering column shroud to the upper shroud.
tomer Learn" programming mode, turn the ignition
(7) If the vehicle is so equipped, move the tilt
switch to the Off position, replace the valid Sentry
steering column to the fully lowered position.
Key with a blank Sentry Key transponder, and turn
(8) If the vehicle is so equipped, loosen the two
the ignition switch back to the On position.
nuts that secure the non-tilt steering column upper
(6) About ten seconds after the completion of Step
mounting bracket to the dash panel steering column
5, a single audible chime tone will sound and the
XJ VEHICLE THEFT/SECURITY SYSTEMS 8Q - 5
REMOVAL AND INSTALLATION (Continued)
(10) Disengage the steering column wire harness
retainer from the tab on the top of the Sentry Key
Immobilizer Module (SKIM) mounting bracket (Fig.
(11) Unplug the wire harness connector from the
(12) The SKIM mounting bracket features a clip
formation that secures the SKIM to the inboard
lower flange of the steering column jacket. Pull
downward on the connector end of the SKIM mount-
ing bracket to release this clip from the steering col-
(13) Rotate the SKIM and its mounting bracket
downwards and then to the side away from the steer-
ing column to slide the SKIM antenna ring from
around the ignition switch lock cylinder housing.
(14) Remove the SKIM from the vehicle.
(15) Reverse the removal procedures to install.
Tighten the non-tilt steering column mounting nuts
to 22 N
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