Service Manuals, User Guides, Schematic Diagrams or docs for : . Car Manuals Jeep Cherokee XJ 1997.1999-2001 Approved 2000 XJ Jeep Cherokee exj_8q

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XJ                                                                         VEHICLE THEFT/SECURITY SYSTEMS           8Q - 1

                         VEHICLE THEFT/SECURITY SYSTEMS
                                                  TABLE OF 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 . . . . . . . . . . . 4
 SENTRY KEY IMMOBILIZER SYSTEM                                         SENTRY KEY IMMOBILIZER MODULE. . . . . . . . . 4
   INDICATOR LAMP . . . . . . . . . . . . . . . . . . . . . . . 3

GENERAL INFORMATION                                                   malfunction is detected. The SKIS can be diagnosed,
                                                                      and any stored DTC can be retrieved using a
INTRODUCTION                                                          DRBIII scan tool as described in the proper Diag-
  The Sentry Key Immobilizer System (SKIS) is                         nostic Procedures manual.
available factory-installed optional equipment for this
model. Following are some general descriptions of the                 DESCRIPTION AND OPERATION
features and components of the SKIS. Refer to the
vehicle owner's manual for more information on the
                                                                      SENTRY KEY IMMOBILIZER MODULE
use and operation of the SKIS. Refer to 8W-30 - Fuel/
                                                                         The Sentry Key Immobilizer Module (SKIM) con-
Ignition System in Group 8W - Wiring Diagrams for
                                                                      tains a Radio Frequency (RF) transceiver and a cen-
complete circuit descriptions and diagrams.
                                                                      tral processing unit, which includes the Sentry Key
                                                                      Immobilizer System (SKIS) program logic. The SKIS
SENTRY KEY IMMOBILIZER SYSTEM                                         programming enables the SKIM to program and
   The Sentry Key Immobilizer System (SKIS) is
                                                                      retain in memory the codes of at least one, but no
designed to provide passive protection against unau-
                                                                      more than eight electronically coded Sentry Key
thorized vehicle use by preventing the engine from
                                                                      transponders. The SKIS programming also enables
operating while the system is armed. The primary
                                                                      the SKIM to communicate over the Chrysler Collision
components of this system are the Sentry Key Immo-
                                                                      Detection (CCD) data bus network with the Power-
bilizer Module (SKIM), the Sentry Key transponder,
                                                                      train Control Module (PCM), the instrument cluster
the SKIS indicator lamp, and the Powertrain Control
                                                                      and/or the DRBIII scan tool.
Module (PCM).
                                                                         The SKIM transmits and receives RF signals
   The SKIM is installed on the steering column near
                                                                      through a tuned antenna enclosed within a molded
the ignition lock cylinder. The transponder is located
                                                                      plastic ring formation that is integral to the SKIM
under the molded rubber cap on the head of the igni-
                                                                      housing. When the SKIM is properly installed on the
tion key. The SKIS indicator lamp is located in the
                                                                      steering column, the antenna ring is oriented around
instrument cluster.
                                                                      the circumference of the ignition lock cylinder hous-
   The SKIS includes two valid Sentry Key transponders
                                                                      ing. This antenna ring must be located within eight
from the factory. If the customer wishes, additional non-
                                                                      millimeters (0.31 inches) of the Sentry Key in order
coded blank Sentry Keys are available. These blank
                                                                      to ensure proper RF communication between the
keys can be cut to match a valid ignition key, but the
                                                                      SKIM and the Sentry Key transponder.
engine will not start unless the key transponder is also
                                                                         For added system security, each SKIM is pro-
programmed to the vehicle using the Customer Learn
                                                                      grammed with a unique "Secret Key" code and a
programming procedure or a DRBIII scan tool. The
                                                                      security code (PIN). The SKIM keeps the "Secret
SKIS will recognize no more than eight valid Sentry
                                                                      Key" code in memory. This "Secret Key" code must be
Key transponders at any one time.
                                                                      transferred to the PCM memory during the initializa-
   The SKIS performs a self-test each time the igni-
                                                                      tion/programming of the SKIS when the vehicle is
tion switch is turned to the On position, and will
                                                                      manufactured, and each time the PCM is replaced
store Diagnostic Trouble Codes (DTCs) if a system
                                                                      during vehicle service by the dealer technician. The
8Q - 2     VEHICLE THEFT/SECURITY SYSTEMS                                                                         XJ
SKIM also transfers the "Secret Key" code to the                For diagnosis or initialization of the SKIM and the
memory of each of the Sentry Key transponders dur-            PCM, a DRBIII scan tool and the proper Diagnostic
ing new key programming. The security code is used            Procedures manual are required. The SKIM cannot
by the assembly plant to access the SKIS for initial-         be repaired and, if faulty or damaged, the unit must
ization, or by the dealer technician to access the sys-       be replaced.
tem for service. The SKIM also stores in its memory
the Vehicle Identification Number (VIN), which it             SENTRY KEY IMMOBILIZER TRANSPONDER
learns through a CCD data bus message from the                   The Sentry Key Immobilizer System (SKIS) uses a
PCM during initialization.                                    transponder that is integral to each of the two igni-
   The SKIM and the PCM both use software that                tion keys that are supplied with the vehicle when it
includes a rolling code algorithm strategy, which             is shipped from the factory. The transponder chip is
helps to reduce the possibility of unauthorized SKIS          insulated within a nylon mount inserted in the head
disarming. The rolling code algorithm ensures secu-           of the key, and invisible beneath a molded rubber cap
rity by preventing an override of the SKIS through            (Fig. 1).
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 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 SKIM messages.
   The SKIM also sends messages to the instrument
cluster over the CCD data bus network to control the                  Fig. 1 Sentry Key Immobilizer Transponder
SKIS indicator lamp. The SKIM sends messages to the           1   

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