TJ VEHICLE THEFT/SECURITY SYSTEMS 8Q - 1

VEHICLE THEFT/SECURITY SYSTEMS

CONTENTS

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GENERAL INFORMATIONINTRODUCTION . . . . . . . . . . . . . . . . . . . . . . . . 1SMART KEY IMMOBILIZER SYSTEM . . . . . . . 1

DESCRIPTION AND OPERATIONSMART KEY IMMOBILIZER MODULE . . . . . . . 1SMART KEY IMMOBILIZER SYSTEM

INDICATOR LAMP . . . . . . . . . . . . . . . . . . . . . 3SMART KEY IMMOBILIZER TRANSPONDER . 2

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DIAGNOSIS AND TESTINGSMART KEY IMMOBILIZER SYSTEM . . . . . . . 3

SERVICE PROCEDURESSMART KEY IMMOBILIZER SYSTEM

TRANSPONDER PROGRAMMING . . . . . . . . . 4REMOVAL AND INSTALLATION

SMART KEY IMMOBILIZER MODULE . . . . . . . 4

GENERAL INFORMATION

INTRODUCTIONThe Smart Key Immobilizer System (SKIS) is

available factory-installed optional equipment for thismodel. Following are some general descriptions of thefeatures and components of the SKIS. Refer to thevehicle owner’s manual for more information on theuse and operation of the SKIS. Refer to 8W-30 - Fuel/Ignition System in Group 8W - Wiring Diagrams forcomplete circuit descriptions and diagrams.

SMART KEY IMMOBILIZER SYSTEMThe Smart Key Immobilizer System (SKIS) is

designed to provide passive protection against unau-thorized vehicle use by preventing the engine fromoperating while the system is armed. The primarycomponents of this system are the Smart Key Immo-bilizer Module (SKIM), the Smart Key transponder,the SKIS indicator lamp, and the Powertrain ControlModule (PCM).

The SKIM is installed on the steering column nearthe ignition lock cylinder. The transponder is locatedunder the molded rubber cap on the head of the igni-tion key. The SKIS indicator lamp is located in theinstrument cluster.

The SKIS includes two valid Smart Key transpon-ders from the factory. If the customer wishes, addi-tional non-coded blank Smart Keys are available.These blank keys can be cut to match a valid ignitionkey, but the engine will not start unless the key tran-sponder is also programmed to the vehicle. The SKISwill recognize no more than eight valid Smart Keytransponders at any one time.

The SKIS performs a self-test each time the igni-tion switch is turned to the On position, and willstore Diagnostic Trouble Codes (DTCs) if a systemmalfunction is detected. The SKIS can be diagnosed,

and any stored DTC can be retrieved using a DRBscan tool as described in the proper Diagnostic Pro-cedures manual.

DESCRIPTION AND OPERATION

SMART KEY IMMOBILIZER MODULEThe Smart Key Immobilizer Module (SKIM) con-

tains a Radio Frequency (RF) transceiver and a cen-tral processing unit, which includes the Smart KeyImmobilizer System (SKIS) program logic. The SKISprogramming enables the SKIM to program andretain in memory the codes of at least two, but nomore than eight electronically coded Smart Key tran-sponders. The SKIS programming also enables theSKIM to communicate over the Chrysler CollisionDetection (CCD) data bus network with the Power-train Control Module (PCM), the instrument clusterand/or the DRB scan tool.

The SKIM transmits and receives RF signalsthrough a tuned antenna enclosed within a moldedplastic ring formation that is integral to the SKIMhousing. When the SKIM is properly installed on thesteering column, the antenna ring is oriented aroundthe circumference of the ignition lock cylinder hous-ing. This antenna ring must be located within eightmillimeters (0.31 inches) of the Smart Key in orderto ensure proper RF communication between theSKIM and the Smart Key transponder.

For added system security, each SKIM is pro-grammed with a unique “Secret Key” code and a secu-rity code. The SKIM keeps the “Secret Key” code inmemory and sends the code over the CCD data bus tothe PCM, which also keeps this code in its memory. TheSKIM also sends the “Secret Key” code to each of theprogrammed Smart Key transponders. The securitycode is used by the assembly plant to access the SKISfor initialization, or by the dealer technician to access

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DESCRIPTION AND OPERATION (Continued)

the system for service. The SKIM also stores in itsmemory the Vehicle Identification Number (VIN),which it learns through a CCD data bus message fromthe PCM.

The SKIM and the PCM both use software thatincludes a rolling code algorithm strategy, whichhelps to reduce the possibility of unauthorized SKISdisarming. The rolling code algorithm ensures secu-rity by preventing an override of the SKIS throughthe unauthorized substitution of the SKIM or thePCM. However, the use of this strategy also meansthat replacement of either the SKIM or the PCMunits will require a system initialization procedure torestore system operation.

When the ignition switch is turned to the On orStart positions, the SKIM transmits an RF signal toexcite the Smart Key transponder. The SKIM thenlistens for a return RF signal from the transponderof the Smart Key that is inserted in the ignition lockcylinder. If the SKIM receives an RF signal withvalid “Secret Key” and transponder identificationcodes, the SKIM sends a “valid key” message to thePCM over the CCD data bus. If the SKIM receivesan invalid RF signal or no response, it sends “invalidkey” messages to the PCM. The PCM will enable ordisable engine operation based upon the status of theSKIM messages.

The SKIM also sends messages to the instrumentcluster over the CCD data bus network to control theSKIS indicator lamp. The SKIM sends messages to theinstrument cluster to turn the lamp on for about threeseconds when the ignition switch is turned to the Onposition as a bulb test. After completion of the bulbtest, the SKIM sends bus messages to keep the lampoff for a duration of about one second. Then the SKIMsends messages to turn the lamp on or off based uponthe results of the SKIS self-tests. If the SKIS indicatorlamp comes on and stays on after the bulb test, it indi-cates that the SKIM has detected a system malfunc-tion and/or that the SKIS has become inoperative.

If the SKIM detects an invalid key when the igni-tion switch is turned to the On position, it sends mes-sages to the instrument cluster to flash the SKISindicator lamp. The SKIM can also send messages tothe instrument cluster to flash the lamp and to gener-ate a single audible chime tone. These functions serveas an indication to the customer that the SKIS hasbeen placed in its “Customer Learn” programmingmode. See Smart Key Immobilizer System Transpon-der Programming in this group for more informationon the “Customer Learn” programming mode.

For diagnosis or initialization of the SKIM and thePCM, a DRB scan tool and the proper DiagnosticProcedures manual are required. The SKIM cannotbe repaired and, if faulty or damaged, the unit mustbe replaced.

SMART KEY IMMOBILIZER TRANSPONDERThe Smart 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 itis shipped from the factory. The transponder chip isinsulated within a nylon mount inserted in the headof the key, and invisible beneath a molded rubber cap(Fig. 1).

Each Smart Key transponder has a unique tran-sponder identification code programmed into it by themanufacturer. The Smart Key Immobilizer Module(SKIM) has a unique “Secret Key” code programmedinto it by the manufacturer. When a Smart Key tran-sponder is programmed into the memory of theSKIM, the SKIM learns the transponder identifica-tion code from the transponder, and the transponderlearns the “Secret Key” code from the SKIM. Each ofthese codes is stored within the transponder and inthe nonvolatile memory of the SKIM. Therefore,blank keys for the SKIS must be programmed by andinto the SKIM, in addition to being cut to match themechanical coding of the ignition lock cylinder. SeeSmart Key Immobilizer System Transponder Pro-gramming in this group for more information.

The Smart Key transponder is within the range ofthe SKIM transceiver antenna ring when it isinserted in the ignition lock cylinder. When the igni-tion switch is turned to the Start or On positions, theSKIM transceiver issues a Radio Frequency (RF) sig-nal that excites the transponder chip. The transpon-der chip responds by issuing an RF signal containingits transponder identification code and the “SecretKey” code. The SKIM transceiver compares the tran-sponder codes with the codes stored in its memory to

Fig. 1 Smart Key Immobilizer Transponder

TJ VEHICLE THEFT/SECURITY SYSTEMS 8Q - 3

DESCRIPTION AND OPERATION (Continued)

determine whether a valid key is in the ignition lockcylinder.

The Smart Key transponder cannot be repairedand, if faulty or damaged, it must be replaced.

SMART KEY IMMOBILIZER SYSTEM INDICATORLAMP

The Smart Key Immobilizer System (SKIS) indica-tor lamp gives an indication when the SKIS is faultyor when the vehicle has been immobilized due to theuse of an invalid ignition key. The lamp is controlledby the instrument cluster circuitry based upon mes-sages received from the Smart Key Immobilizer Mod-ule (SKIM) on the Chrysler Collision Detection (CCD)data bus.

The SKIM sends messages to the instrument clus-ter to turn the lamp on for about three seconds whenthe ignition switch is turned to the On position as abulb test. After completion of the bulb test, the SKIMsends 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 thelamp on or off based upon the results of the SKISself-tests. If the SKIS indicator lamp comes on andstays on after the bulb test, it indicates that theSKIM has detected a system malfunction and/or thatthe SKIS has become inoperative.

If the SKIM detects an invalid key when the igni-tion switch is turned to the On position, it sendsmessages to the instrument cluster to flash the SKISindicator lamp. The SKIM can also send messages tothe instrument cluster to flash the lamp and to gen-erate a single audible chime tone. These functionsserve as an indication to the customer that the SKIShas been placed in its “Customer Learn” program-ming mode. See Smart Key Immobilizer SystemTransponder Programming in this group for moreinformation on the “Customer Learn” programmingmode.

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 serviceof a faulty SKIS indicator lamp. If the SKIS indicatorlamp comes on and stays on after the bulb test func-tion, diagnosis of the SKIS should be performed witha DRB scan tool and the proper Diagnostic Proce-dures manual.

DIAGNOSIS AND TESTING

SMART KEY IMMOBILIZER SYSTEM

WARNING: ON VEHICLES EQUIPPED WITH AIR-BAGS, REFER TO GROUP 8M - PASSIVERESTRAINT SYSTEMS BEFORE ATTEMPTING ANYSTEERING WHEEL, STEERING COLUMN, ORINSTRUMENT PANEL COMPONENT DIAGNOSIS ORSERVICE. FAILURE TO TAKE THE PROPER PRE-CAUTIONS COULD RESULT IN ACCIDENTAL AIR-BAG DEPLOYMENT AND POSSIBLE PERSONALINJURY.

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 theSmart Key Immobilizer System involves the use of aDRB scan tool. Refer to the proper Diagnostic Pro-cedures manual for the procedures.

The Smart Key Immobilizer System (SKIS) and theChrysler Collision Detection (CCD) data bus networkshould be diagnosed using a DRB scan tool. The DRBwill allow confirmation that the CCD data bus is func-tional, that the Smart Key Immobilizer Module (SKIM)is placing the proper messages on the CCD data bus,and that the Powertrain Control Module (PCM) and theinstrument cluster are receiving the CCD data busmessages. Refer to the proper Diagnostic Proceduresmanual for the procedures. Refer to 8W-30 - Fuel/Igni-tion System in Group 8W - Wiring Diagrams for com-plete 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 orcomponent as required and replace the faulty fuse.

(2) Disconnect and isolate the battery negativecable. Unplug the wire harness connector at theSKIM. Check for continuity between the ground cir-cuit cavity of the SKIM wire harness connector and agood ground. There should be continuity. If OK, go toStep 3. If not OK, repair the open circuit to groundas required.

(3) Connect the battery negative cable. Check forbattery voltage at the fused B(+) circuit cavity of theSKIM wire harness connector. If OK, go to Step 4. Ifnot OK, repair the open circuit to the fuse in thefuseblock module as required.

(4) Turn the ignition switch to the On position.Check for battery voltage at the fused ignition switchoutput (run/start) circuit cavity of the SKIM wire har-ness connector. If OK, use a DRB scan tool and theproper Diagnostic Procedures manual to complete thediagnosis of the SKIS. If not OK, repair the open cir-cuit to the fuse in the fuseblock module as required.

8Q - 4 VEHICLE THEFT/SECURITY SYSTEMS TJ

SERVICE PROCEDURES

SMART KEY IMMOBILIZER SYSTEMTRANSPONDER PROGRAMMING

Two programmed Smart Key transponders areincluded with the Smart Key Immobilizer System(SKIS) when it is shipped from the factory. TheSmart Key Immobilizer Module (SKIM) can be pro-grammed to recognize up to six additional transpon-ders, for a total of eight Smart Keys. The following“Customer Learn” programming procedure for theprogramming of additional transponders requiresaccess to at least two of the valid Smart Keys. If twovalid Smart Keys are not available, Smart Key pro-gramming will require the use of a DRB scan tooland the proper Diagnostic Procedures manual.

CUSTOMER LEARN(1) Obtain the additional Smart Key transponder

blank(s) that are to be programmed for the vehicle.Cut the additional Smart Key transponder blanks tomatch the ignition lock cylinder mechanical keycodes.

(2) Insert one of the two valid Smart Key tran-sponders into the ignition switch and turn the igni-tion switch to the On position.

(3) After the ignition switch has been in the Onposition for about three seconds, but no more thanfifteen seconds later, cycle the ignition switch back tothe Off position. Replace the first valid Smart Key inthe ignition lock cylinder with the second validSmart Key and turn the ignition switch back to theOn position.

(4) About ten seconds after the completion of Step3, the SKIS indicator lamp will start to flash and asingle audible chime tone will sound to indicate thatthe system has entered the “Customer Learn” pro-gramming mode.

(5) Within about fifty seconds of entering the “Cus-tomer Learn” programming mode, turn the ignitionswitch to the Off position, replace the valid SmartKey with a blank Smart Key transponder, and turnthe ignition switch back to the On position.

(6) About ten seconds after the completion of Step5, a single audible chime tone will sound and theSKIS indicator lamp will stop flashing to indicatethat the blank Smart Key transponder has been suc-cessfully programmed. The SKIS will immediatelyreturn to normal system operation following exitfrom the “Customer Learn” programming mode,starting with the three second SKIS indicator lampbulb test function.

(7) Go back to Step 2 and repeat this process foreach additional Smart Key transponder blank to beprogrammed.

If any of the above steps is not completed in theproper sequence, or within the allotted time, theSKIS will automatically exit the “Customer Learn”programming mode. The SKIS will also automaticallyexit the “Customer Learn” programming mode if itsees a non-blank Smart Key transponder when itshould see a blank, if it has already programmedeight valid Smart Keys, or if the ignition switch isturned to the Off position for more than about fiftyseconds.

REMOVAL AND INSTALLATION

SMART KEY IMMOBILIZER MODULE

WARNING: ON VEHICLES EQUIPPED WITH AIR-BAGS, REFER TO GROUP 8M - PASSIVERESTRAINT SYSTEMS BEFORE ATTEMPTING ANYSTEERING WHEEL, STEERING COLUMN, ORINSTRUMENT PANEL COMPONENT DIAGNOSIS ORSERVICE. FAILURE TO TAKE THE PROPER PRE-CAUTIONS COULD RESULT IN ACCIDENTAL AIR-BAG DEPLOYMENT AND POSSIBLE PERSONALINJURY.

(1) Disconnect and isolate the battery negativecable.

(2) Remove the knee blocker from the instrumentpanel. See Knee Blocker in Group 8E - InstrumentPanel Systems for the procedures.

(3) Insert the key in the ignition lock cylinder andturn the ignition switch to the On position.

(4) Insert a small screwdriver or pin punchthrough the access hole in the lower steering columnshroud and depress the ignition lock cylinder retain-ing tumbler (Fig. 2).

(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 lowersteering column shroud to the upper shroud.

(7) If the vehicle is so equipped, move the tiltsteering column to the fully lowered position.

(8) If the vehicle is so equipped, loosen the twonuts that secure the non-tilt steering column uppermounting bracket to the dash panel steering columnsupport bracket studs. Lower the column far enoughto remove the upper steering column shroud.

(9) Remove both the upper and lower shrouds fromthe steering column.

(10) Disengage the steering column wire harnessretainer from the tab on the top of the Smart KeyImmobilizer Module (SKIM) mounting bracket (Fig.3).

(11) Unplug the wire harness connector from theSKIM receptacle.

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REMOVAL AND INSTALLATION (Continued)

Fig. 2 Steering Column Shrouds Remove/Install

(12) The SKIM mounting bracket features a clipformation that secures the SKIM to the inboardlower flange of the steering column jacket. Pulldownward 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 bracketdownwards and then to the side away from the steer-ing column to slide the SKIM antenna ring fromaround 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 nutsto 22 N·m (200 in. lbs.) and the steering columnshroud mounting screws to 2 N·m (18 in. lbs.).

(16) If the SKIM is replaced with a new unit, aDRB scan tool and the proper Diagnostic Proceduresmanual MUST be used to initialize the new SKIMand to program at least two Smart Key transponders.

Fig. 3 Smart Key Immobilizer Module Remove/Install