exj_8qa.pdf

VEHICLE THEFT/SECURITY SYSTEMS

8Q - 1

VEHICLE THEFT/SECURITY SYSTEMS

TABLE OF CONTENTS

page

DESCRIPTION AND OPERATION

SENTRY KEY IMMOBILIZER SYSTEM .........1

SENTRY KEY IMMOBILIZER MODULE.........1

SENTRY KEY IMMOBILIZER TRANSPONDER ...2

SENTRY KEY IMMOBILIZER SYSTEM

INDICATOR LAMP .......................2

DIAGNOSIS AND TESTING

SENTRY KEY IMMOBILIZER SYSTEM .........3

SERVICE PROCEDURES

SENTRY KEY IMMOBILIZER SYSTEM

TRANSPONDER PROGRAMMING ...........3

REMOVAL AND INSTALLATION

SENTRY KEY IMMOBILIZER MODULE.........4

DESCRIPTION AND OPERATION

more than eight electronically coded Sentry Key

transponders. The SKIS programming also enables

the SKIM to communicate over the Chrysler Collision

Detection (CCD) data bus network with the Power-

train Control Module (PCM), the instrument cluster

and/or the DRB scan tool.

The SKIM transmits and receives RF signals

through a tuned antenna enclosed within a molded

plastic ring formation that is integral to the SKIM

housing. When the SKIM is properly installed on the

steering column, the antenna ring is oriented around

the circumference of the ignition lock cylinder hous-

ing. This antenna ring must be located within eight

millimeters (0.31 inches) of the Sentry Key in order

SENTRY KEY IMMOBILIZER SYSTEM

The Sentry Key Immobilizer System (SKIS) is

designed to provide passive protection against unau-

thorized vehicle use by preventing the engine from

operating. The primary components of this system

are the Sentry Key Immobilizer Module (SKIM), the

Sentry Key transponder, the SKIS indicator lamp,

and the Powertrain Control Module (PCM).

The SKIM is installed on the steering column near

the ignition lock cylinder. The transponder is located

under the molded rubber cap on the head of the igni-

tion key. The SKIS indicator lamp is located in the

instrument cluster.

The SKIS includes two valid Sentry Key transpon-

ders from the factory. If the customer wishes, addi-

tional non-coded blank Sentry Keys are available.

These blank keys can be cut to match a valid ignition

key, but the engine will not start unless the key tran-

sponder is also programmed to the vehicle. The SKIS

will recognize no more than eight valid Sentry Key

transponders at any one time.

The SKIS performs a self-test each time the igni-

tion switch is turned to the On position, and will

store Diagnostic Trouble Codes (DTCs) if a system

malfunction is detected. The SKIS can be diagnosed,

and any stored DTC can be retrieved using a DRB

scan tool as described in the proper Diagnostic Pro-

cedures manual.

ensure

proper

communication

between

the

SKIM and the Sentry Key transponder.

For added system security, each SKIM is pro-

grammed with a unique “Secret Key” code and a

security code. The SKIM keeps the “Secret Key” code

in memory and sends the code over the CCD data

bus to the PCM, which also keeps this code in its

memory. The SKIM also sends the “Secret Key” code

to each of the programmed Sentry Key transponders.

The security code is used by the assembly plant to

access the SKIS for initialization, or by the dealer

technician to access the system for service. The

SKIM also stores in its memory the Vehicle Identifi-

cation Number (VIN), which it learns through a CCD

data bus message from the PCM during initializa-

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

SENTRY KEY IMMOBILIZER MODULE

The Sentry Key Immobilizer Module (SKIM) con-

tains a Radio Frequency (RF) transceiver and a cen-

tral processing unit, which includes the Sentry Key

Immobilizer System (SKIS) program logic. The SKIS

programming enables the SKIM to program and

retain in memory the codes of at least two, but no

8Q - 2

VEHICLE THEFT/SECURITY SYSTEMS

DESCRIPTION AND OPERATION (Continued)

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

SKIS indicator lamp. The SKIM sends messages to

the instrument cluster to turn the lamp on for about

three seconds when the ignition switch is turned to

the On position as a bulb test. After completion of

the bulb test, the SKIM sends bus messages to keep

the lamp off for a duration of about one second. Then

the SKIM sends messages to turn the lamp on or off

based upon the results of the SKIS self-tests. If the

SKIS indicator lamp comes on and stays on after the

bulb test, it indicates that the SKIM has detected a

system malfunction and/or that the SKIS has become

inoperative.

If the SKIM detects an invalid key or transponder

fault when the ignition switch is turned to the On

position, it sends messages to the instrument cluster

to flash the SKIS indicator lamp.

For diagnosis or initialization of the SKIM and the

PCM, a DRB scan tool and the proper Diagnostic

Procedures manual are required. The SKIM cannot

be repaired and, if faulty or damaged, the unit must

be replaced.

Fig. 1 Sentry Key Immobilizer Transponder

1 – MOLDED CAP

2 – TRANSPONDER

3 – MOLDED CAP REMOVED

4 – SENTRY KEY

these codes is stored within the transponder and in

the nonvolatile memory of the SKIM. Therefore,

blank keys for the SKIS must be programmed by and

into the SKIM, in addition to being cut to match the

mechanical coding of the ignition lock cylinder. See

Sentry

Key

Immobilizer

System

Transponder

Pro-

gramming in this group for more information.

The Sentry Key transponder is within the range of

the SKIM transceiver antenna ring when it is

inserted in the ignition lock cylinder. When the igni-

tion switch is turned to the Start or On positions, the

SKIM transceiver issues a Radio Frequency (RF) sig-

nal that excites the transponder chip. The transpon-

der chip responds by issuing an RF signal containing

its transponder identification code and the “Secret

Key” code. The SKIM transceiver compares the tran-

sponder codes with the codes stored in its memory to

determine whether a valid key is in the ignition lock

cylinder.

The Sentry Key transponder cannot be repaired

and, if faulty or damaged, it must be replaced.

SENTRY KEY IMMOBILIZER TRANSPONDER

The Sentry Key Immobilizer System (SKIS) uses a

transponder that is integral to each of the two igni-

tion keys that are supplied with the vehicle when it

is shipped from the factory. The transponder chip is

insulated within a nylon mount inserted in the head

of the key, and invisible beneath a molded rubber cap

(Fig. 1).

Each Sentry Key transponder has a unique tran-

sponder identification code programmed into it by the

manufacturer. The Sentry Key Immobilizer Module

(SKIM) has a unique “Secret Key” code programmed

into it by the manufacturer. When a Sentry Key

transponder is programmed into the memory of the

SKIM, the SKIM learns the transponder identifica-

tion code from the transponder, and the transponder

learns the “Secret Key” code from the SKIM. Each of

SENTRY KEY IMMOBILIZER SYSTEM

INDICATOR LAMP

The Sentry Key Immobilizer System (SKIS) indica-

tor lamp gives an indication when the SKIS is faulty

or when the vehicle has been immobilized due to the

use of an invalid ignition key. The lamp is controlled

by the instrument cluster circuitry based upon mes-

sages received from the Sentry Key Immobilizer

Module (SKIM) on the Chrysler Collision Detection

(CCD) data bus.

VEHICLE THEFT/SECURITY SYSTEMS

8Q - 3

DESCRIPTION AND OPERATION (Continued)

The SKIM sends messages to the instrument clus-

ter to turn the lamp on for about three seconds when

the ignition switch is turned to the On position as a

bulb test. After completion of the bulb test, the SKIM

sends bus messages to keep the lamp off for a dura-

tion of about one second. Then the SKIM sends mes-

sages to the instrument cluster circuitry to turn the

lamp on or off based upon the results of the SKIS

self-tests. If the SKIS indicator lamp comes on and

stays on after the bulb test, it indicates that the

SKIM has detected a system malfunction and/or that

the SKIS has become inoperative. If the SKIM

detects an invalid key or transponder fault when the

ignition switch is turned to the On position, it sends

messages to the instrument cluster to flash the SKIS

indicator lamp.

The SKIS indicator lamp uses a replaceable incan-

descent bulb and bulb holder on the instrument clus-

ter electronic circuit board. Refer to Group 8E -

Instrument Panel Systems for diagnosis and service

of a faulty SKIS indicator lamp. If the SKIS indicator

lamp comes on and stays on after the bulb test func-

tion, diagnosis of the SKIS should be performed with

a DRB scan tool and the proper Diagnostic Proce-

dures manual.

work should be diagnosed using a DRB scan tool.

The DRB will allow confirmation that the CCD data

bus is functional, that the Sentry Key Immobilizer

Module (SKIM) is placing the proper messages on the

CCD data bus, and that the Powertrain Control Mod-

ule (PCM) and the instrument cluster are receiving

the CCD data bus messages. Refer to the proper

Diagnostic Procedures manual for the procedures.

Refer to 8W-30 - Fuel/Ignition System in Group 8W -

Wiring

Diagrams

for

complete

circuit

descriptions

and diagrams.

(1) Check the fuses in the fuseblock module. If OK,

go to Step 2. If not OK, repair the shorted circuit or

component as required and replace the faulty fuse.

(2) Disconnect and isolate the battery negative

cable. Unplug the wire harness connector at the

SKIM. Check for continuity between the ground cir-

cuit cavity of the SKIM wire harness connector and a

good ground. There should be continuity. If OK, go to

Step 3. If not OK, repair the open circuit to ground

as required.

(3) Connect the battery negative cable. Check for

battery voltage at the fused B(+) circuit cavity of the

SKIM wire harness connector. If OK, go to Step 4. If

not OK, repair the open circuit to the fuse in the

fuseblock module as required.

(4) Turn the ignition switch to the On position.

Check for battery voltage at the fused ignition switch

output (run/start) circuit cavity of the SKIM wire

harness connector. If OK, use a DRB scan tool and

the proper Diagnostic Procedures manual to complete

the diagnosis of the SKIS. If not OK, repair the open

circuit

DIAGNOSIS AND TESTING

SENTRY KEY IMMOBILIZER SYSTEM

WARNING: ON VEHICLES EQUIPPED WITH AIR-

BAGS, REFER TO GROUP 8M - PASSIVE

RESTRAINT SYSTEMS BEFORE ATTEMPTING ANY

STEERING WHEEL, STEERING COLUMN, OR

INSTRUMENT PANEL COMPONENT DIAGNOSIS OR

SERVICE. FAILURE TO TAKE THE PROPER PRE-

CAUTIONS COULD RESULT IN ACCIDENTAL AIR-

BAG

the

fuse

the

fuseblock

module

required.

SERVICE PROCEDURES

SENTRY KEY IMMOBILIZER SYSTEM

TRANSPONDER PROGRAMMING

Two programmed Sentry Key transponders are

included with the Sentry Key Immobilizer System

(SKIS) when it is shipped from the factory. The Sen-

try Key Immobilizer Module (SKIM) can be pro-

grammed to recognize up to six additional

transponders, for a total of eight Sentry Keys. Sentry

Key programming will require the use of a DRB scan

tool and the proper Diagnostic Procedures manual.

DEPLOYMENT

AND

POSSIBLE

PERSONAL

INJURY.

NOTE: The following tests may not prove conclu-

sive in the diagnosis of this system. The most reli-

able, efficient, and accurate means to diagnose the

Sentry Key Immobilizer System involves the use of

a DRB scan tool. Refer to the proper Diagnostic

Procedures manual for the procedures.

The Sentry Key Immobilizer System (SKIS) and

the Chrysler Collision Detection (CCD) data bus net-

8Q - 4

VEHICLE THEFT/SECURITY SYSTEMS

REMOVAL AND INSTALLATION

(5) While holding the retaining tumbler depressed,

pull the ignition lock cylinder and key out of the igni-

tion lock housing.

(6) Remove the three screws that secure the lower

steering column shroud to the upper shroud.

(7) If

SENTRY KEY IMMOBILIZER MODULE

WARNING: ON VEHICLES EQUIPPED WITH AIR-

BAGS, REFER TO GROUP 8M - PASSIVE

RESTRAINT SYSTEMS BEFORE ATTEMPTING ANY

STEERING WHEEL, STEERING COLUMN, OR

INSTRUMENT PANEL COMPONENT DIAGNOSIS OR

SERVICE. FAILURE TO TAKE THE PROPER PRE-

CAUTIONS COULD RESULT IN ACCIDENTAL AIR-

BAG

the

vehicle

equipped,

move

the

tilt

steering column to the fully lowered position.

(8) If the vehicle is so equipped, loosen the two

nuts that secure the non-tilt steering column upper

mounting bracket to the dash panel steering column

support bracket studs. Lower the column far enough

to remove the upper steering column shroud.

(9) Remove both the upper and lower shrouds from

the steering column.

(10) Disengage the steering column wire harness

retainer from the tab on the top of the Sentry Key

Immobilizer Module (SKIM) mounting bracket (Fig.

3).

(11) Unplug the wire harness connector from the

SKIM receptacle.

(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-

umn jacket.

(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.

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-

ing tumbler (Fig. 2).

Fig. 2 Steering Column Shrouds Remove/Install

1 – LOWER SHROUD

2 – ACCESS HOLE

3 – STEERING WHEEL

4 – PIN PUNCH

5 – SCREWS (3)

VEHICLE THEFT/SECURITY SYSTEMS

8Q - 5

REMOVAL AND INSTALLATION (Continued)

Fig. 3 Sentry Key Immobilizer Module Remove/Install

1 – UPPER SHROUD

2 – STEERING COLUMN

3 – WIRE HARNESS CONNECTOR

4 – SENTRY KEY IMMOBILIZER MODULE

5 – IGNITION LOCK CYLINDER

6 – SCREW

7 – LOWER SHROUD

8 – STEERING WHEEL

(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·m (200 in. lbs.) and the steering column

shroud mounting screws to 2 N·m (18 in. lbs.).

(16) If the SKIM is replaced with a new unit, a

DRB scan tool and the proper Diagnostic Procedures

manual MUST be used to initialize the new SKIM

and

program

least

two

Sentry

Key

transponders.

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