Service Manuals, User Guides, Schematic Diagrams or docs for : . Car Manuals Jeep Cherokee XJ 1997.1999-2001 Approved 1999 XJ Jeep Cherokee EXJ_8QA
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XJ VEHICLE THEFT/SECURITY SYSTEMS 8Q - 1
VEHICLE THEFT/SECURITY SYSTEMS
CONTENTS
page page
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 . . . . . . . . . . 3
SENTRY KEY IMMOBILIZER SYSTEM REMOVAL AND INSTALLATION
INDICATOR LAMP . . . . . . . . . . . . . . . . . . . . . . 3 SENTRY KEY IMMOBILIZER MODULE . . . . . . . . 4
SENTRY KEY IMMOBILIZER TRANSPONDER . . 2
GENERAL INFORMATION scan tool as described in the proper Diagnostic Pro-
cedures manual.
INTRODUCTION
The Sentry Key Immobilizer System (SKIS) is DESCRIPTION AND OPERATION
available factory-installed optional equipment for this
model. Following are some general descriptions of the
SENTRY KEY IMMOBILIZER MODULE
features and components of the SKIS. Refer to the
The Sentry Key Immobilizer Module (SKIM) con-
vehicle owner's manual for more information on the
tains a Radio Frequency (RF) transceiver and a cen-
use and operation of the SKIS. Refer to 8W-30 - Fuel/
tral processing unit, which includes the Sentry Key
Ignition System in Group 8W - Wiring Diagrams for
Immobilizer System (SKIS) program logic. The SKIS
complete circuit descriptions and diagrams.
programming enables the SKIM to program and
retain in memory the codes of at least two, but no
SENTRY KEY IMMOBILIZER SYSTEM more than eight electronically coded Sentry Key
The Sentry Key Immobilizer System (SKIS) is
transponders. The SKIS programming also enables
designed to provide passive protection against unau-
the SKIM to communicate over the Chrysler Collision
thorized vehicle use by preventing the engine from
Detection (CCD) data bus network with the Power-
operating. The primary components of this system
train Control Module (PCM), the instrument cluster
are the Sentry Key Immobilizer Module (SKIM), the
and/or the DRB scan tool.
Sentry Key transponder, the SKIS indicator lamp,
The SKIM transmits and receives RF signals
and the Powertrain Control Module (PCM).
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-
instrument cluster.
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
and any stored DTC can be retrieved using a DRB
technician to access the system for service. The
8Q - 2 VEHICLE THEFT/SECURITY SYSTEMS XJ
DESCRIPTION AND OPERATION (Continued)
SKIM also stores in its memory the Vehicle Identifi- insulated within a nylon mount inserted in the head
cation Number (VIN), which it learns through a CCD of the key, and invisible beneath a molded rubber cap
data bus message from the PCM during initializa- (Fig. 1).
tion.
The SKIM and the PCM both use software that
includes a rolling code algorithm strategy, which
helps to reduce the possibility of unauthorized SKIS
disarming. The rolling code algorithm ensures secu-
rity by preventing an override of the SKIS through
the unauthorized substitution of the SKIM or the
PCM. However, the use of this strategy also means
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 Fig. 1 Sentry Key Immobilizer Transponder
an invalid RF signal or no response, it sends "invalid
key" messages to the PCM. The PCM will enable or Each Sentry Key transponder has a unique tran-
disable engine operation based upon the status of the sponder identification code programmed into it by the
SKIM messages. manufacturer. The Sentry Key Immobilizer Module
The SKIM also sends messages to the instrument (SKIM) has a unique "Secret Key" code programmed
cluster over the CCD data bus network to control the into it by the manufacturer. When a Sentry Key
SKIS indicator lamp. The SKIM sends messages to transponder is programmed into the memory of the
the instrument cluster to turn the lamp on for about SKIM, the SKIM learns the transponder identifica-
three seconds when the ignition switch is turned to tion code from the transponder, and the transponder
the On position as a bulb test. After completion of learns the "Secret Key" code from the SKIM. Each of
the bulb test, the SKIM sends bus messages to keep these codes is stored within the transponder and in
the lamp off for a duration of about one second. Then the nonvolatile memory of the SKIM. Therefore,
the SKIM sends messages to turn the lamp on blank keys for the SKIS must be programmed by and
(steady or flashing) or off based upon the results of into the SKIM, in addition to being cut to match the
the SKIS self-tests. If the SKIS indicator lamp comes mechanical coding of the ignition lock cylinder. See
on and stays on after the bulb test, it indicates that Sentry Key Immobilizer System Transponder Pro-
the SKIM has detected a system malfunction and/or gramming in this group for more information.
that the SKIS has become inoperative. The Sentry Key transponder is within the range of
If the SKIM detects an invalid key when the igni- the SKIM transceiver antenna ring when it is
tion switch is turned to the On position, it sends inserted in the ignition lock cylinder. When the igni-
messages to the instrument cluster to flash the SKIS tion switch is turned to the Start or On positions, the
indicator lamp. 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
Procedures manual are required. The SKIM cannot its transponder identification code and the "Secret
be repaired and, if faulty or damaged, the unit must Key" code. The SKIM transceiver compares the tran-
be replaced. sponder codes with the codes stored in its memory to
determine whether a valid key is in the ignition lock
SENTRY KEY IMMOBILIZER TRANSPONDER cylinder.
The Sentry Key Immobilizer System (SKIS) uses a The Sentry Key transponder cannot be repaired
transponder that is integral to each of the two igni- and, if faulty or damaged, it must be replaced.
tion keys that are supplied with the vehicle when it
is shipped from the factory. The transponder chip is
XJ VEHICLE THEFT/SECURITY SYSTEMS 8Q - 3
DESCRIPTION AND OPERATION (Continued)
SENTRY KEY IMMOBILIZER SYSTEM NOTE: The following tests may not prove conclu-
sive in the diagnosis of this system. The most reli-
INDICATOR LAMP
able, efficient, and accurate means to diagnose the
The Sentry Key Immobilizer System (SKIS) indica-
Sentry Key Immobilizer System involves the use of
tor lamp gives an indication when the SKIS is faulty
a DRB scan tool. Refer to the proper Diagnostic
or when the vehicle has been immobilized due to the
Procedures manual for the procedures.
use of an invalid ignition key. The lamp is controlled
by the instrument cluster circuitry based upon mes- The Sentry Key Immobilizer System (SKIS) and the
sages received from the Sentry Key Immobilizer Chrysler Collision Detection (CCD) data bus network
Module (SKIM) on the Chrysler Collision Detection should be diagnosed using a DRB scan tool. The DRB
(CCD) data bus. will allow confirmation that the CCD data bus is func-
The SKIM sends messages to the instrument clus- tional, that the Sentry Key Immobilizer Module (SKIM)
ter to turn the lamp on for about three seconds when is placing the proper messages on the CCD data bus,
the ignition switch is turned to the On position as a and that the Powertrain Control Module (PCM) and the
bulb test. After completion of the bulb test, the SKIM instrument cluster are receiving the CCD data bus mes-
sends bus messages to keep the lamp off for a dura- sages. Refer to the proper Diagnostic Procedures man-
tion of about one second. Then the SKIM sends mes- ual for the procedures. Refer to 8W-30 - Fuel/Ignition
sages to the instrument cluster circuitry to turn the System in Group 8W - Wiring Diagrams for complete
lamp on or off based upon the results of the SKIS circuit descriptions and diagrams.
self-tests. If the SKIS indicator lamp comes on and (1) Check the fuses in the fuseblock module. If OK,
stays on after the bulb test, it indicates that the go to Step 2. If not OK, repair the shorted circuit or
SKIM has detected a system malfunction and/or that component as required and replace the faulty fuse.
the SKIS has become inoperative. If the SKIM (2) Disconnect and isolate the battery negative cable.
detects an invalid key when the ignition switch is Unplug the wire harness connector at the SKIM. Check
turned to the On position, it sends messages to the for continuity between the ground circuit cavity of the
instrument cluster to flash the SKIS indicator lamp. SKIM wire harness connector and a good ground. There
The SKIM can also send messages to the instru- should be continuity. If OK, go to Step 3. If not OK,
ment cluster to flash the lamp and to generate a sin- repair the open circuit to ground as required.
gle audible chime tone. These functions serve as an (3) Connect the battery negative cable. Check for
indication to the customer that the SKIS has been battery voltage at the fused B(+) circuit cavity of the
placed in its "Customer Learn" programming mode. SKIM wire harness connector. If OK, go to Step 4. If
See Sentry Key Immobilizer System Transponder not OK, repair the open circuit to the fuse in the
Programming in this group for more information on fuseblock module as required.
the "Customer Learn" programming mode. (4) Turn the ignition switch to the On position.
The SKIS indicator lamp uses a replaceable incan- Check for battery voltage at the fused ignition switch
descent bulb and bulb holder on the instrument clus- output (run/start) circuit cavity of the SKIM wire har-
ter electronic circuit board. Refer to Group 8E - ness connector. If OK, use a DRB scan tool and the
Instrument Panel Systems for diagnosis and service proper Diagnostic Procedures manual to complete the
of a faulty SKIS indicator lamp. If the SKIS indicator diagnosis of the SKIS. If not OK, repair the open circuit
lamp comes on and stays on after the bulb test func- to the fuse in the fuseblock module as required.
tion, diagnosis of the SKIS should be performed with
a DRB scan tool and the proper Diagnostic Proce-
dures manual. SERVICE PROCEDURES
SENTRY KEY IMMOBILIZER SYSTEM
DIAGNOSIS AND TESTING
TRANSPONDER PROGRAMMING
SENTRY KEY IMMOBILIZER SYSTEM Two programmed Sentry Key transponders are
included with the Sentry Key Immobilizer System
WARNING: ON VEHICLES EQUIPPED WITH AIRBAGS, (SKIS) when it is shipped from the factory. The Sen-
REFER TO GROUP 8M - PASSIVE RESTRAINT SYS- try Key Immobilizer Module (SKIM) can be pro-
TEMS BEFORE ATTEMPTING ANY STEERING WHEEL, grammed to recognize up to six additional
STEERING COLUMN, OR INSTRUMENT PANEL COM- transponders, for a total of eight Sentry Keys. Sentry
PONENT DIAGNOSIS OR SERVICE. FAILURE TO TAKE Key programming will require the use of a DRB scan
THE PROPER PRECAUTIONS COULD RESULT IN tool and the proper Diagnostic Procedures manual.
ACCIDENTAL AIRBAG DEPLOYMENT AND POSSIBLE
PERSONAL INJURY.
8Q - 4 VEHICLE THEFT/SECURITY SYSTEMS XJ
REMOVAL AND INSTALLATION
SENTRY KEY IMMOBILIZER MODULE
WARNING: ON VEHICLES EQUIPPED WITH AIRBAGS,
REFER TO GROUP 8M - PASSIVE RESTRAINT SYS-
TEMS BEFORE ATTEMPTING ANY STEERING WHEEL,
STEERING COLUMN, OR INSTRUMENT PANEL COM-
PONENT DIAGNOSIS OR SERVICE. FAILURE TO TAKE
THE PROPER PRECAUTIONS COULD RESULT IN
ACCIDENTAL AIRBAG DEPLOYMENT AND POSSIBLE
PERSONAL INJURY.
(1) Disconnect the negative battery cable.
(2) Remove the knee blocker from the instrument
panel. See Knee Blocker in Group 8E - Instrument
Panel Systems for the procedures.
(3) Insert the key in the ignition lock cylinder and
turn the ignition switch to the On position.
(4) Insert a small screwdriver or pin punch
through the access hole in the lower steering column
shroud and depress the ignition lock cylinder retain- Fig. 2 Steering Column Shrouds Remove/Install
ing tumbler (Fig. 2).
lower flange of the steering column jacket. Pull
(5) While holding the retaining tumbler depressed,
downward on the connector end of the SKIM mount-
pull the ignition lock cylinder and key out of the igni-
ing bracket to release this clip from the steering col-
tion lock housing.
umn jacket.
(6) Remove the three screws that secure the lower
(13) Rotate the SKIM and its mounting bracket
steering column shroud to the upper shroud.
downwards and then to the side away from the steer-
(7) If the vehicle is so equipped, move the tilt
ing column to slide the SKIM antenna ring from
steering column to the fully lowered position.
around the ignition switch lock cylinder housing.
(8) If the vehicle is so equipped, loosen the two
(14) Remove the SKIM from the vehicle.
nuts that secure the non-tilt steering column upper
(15) Reverse the removal procedures to install.
mounting bracket to the dash panel steering column
Tighten the non-tilt steering column mounting nuts
support bracket studs. Lower the column far enough
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