ZJ VEHICLE THEFT ALARM 8Q - 1 VEHICLE THEFT ALARM CONTENTS page pageDIAGNOSIS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 SERVICE PROCEDURES ................... 6GENERAL INFORMATION . . . . . . . . . . . . . . . . . . 1 GENERAL INFORMATION The Vehicle Theft Alarm (VTA) system is an avail- DISARMINGable option on Grand Cherokee models. This system Passive disarming occurs upon normal vehicle en-is designed to protect against vehicle theft by moni- try (unlocking either front door or liftgate, with thetoring vehicle doors, hood, liftgate and ignition action key). This disarming also will halt the alarm, once itfor unauthorized operation. When unauthorized oper- has been activated.ation is detected, the VTA system responds by sound- Active disarming occurs when the remote keylessing the horn, flashing the headlamps, park and tail entry transmitter is used to unlock the vehicle doors.lamps and providing an engine no-run feature. Fol- This disarming also will halt the alarm, once it haslowing are general descriptions of the features of the been activated.VTA system. Refer to Group 8W - Wiring Diagramsfor complete circuit descriptions and diagrams. POWER-UP MODEARMING When the battery is disconnected and then recon- Passive arming occurs upon normal vehicle exit (ig- nected, or when the battery has been drained andnition OFF, open door, lock with power lock switch, the vehicle is being jump started, the VTA system en-close door). The alarm system will not arm if the ters its power-up alarm mode which:doors are manually locked, providing a manual over- • flashes the headlampsride of alarm. • flashes the park and tail lamps Active arming occurs when the remote keyless en- • prevents the engine from running.try transmitter is used to lock the vehicle doors, The alarm system must be actively or pas-whether the doors are open or closed. If one or more sively disarmed to exit the power-up mode afterdoors are open, the arming sequence is completed any battery reconnection.only after all doors and the liftgate are closed. After active or passive arming, the security lamp in TAMPER ALERTthe instrument panel will flash for 15 seconds, show- A tamper alert feature notifies the driver that theing that arming is in progress. Note that this 15 sec- alarm had been activated, and has since timed-outond arming period will start after the illuminated (alarmed for more than 18 minutes). This alert givesentry system has timed out (courtesy lamps off). If no 3 horn pulses when the system is actively or pas-monitored systems are activated during this period, sively disarmed.the system will arm. If the hood switch is not seen by the system, the ON-BOARD DIAGNOSTIC SYSTEMsecurity lamp will remain steadily lit during the The DRB scan tool may be used to test the VTAarming process. While the system will still arm, the system. Refer to the appropriate Diagnostic Proce-engine compartment will not be protected from entry dures manual for more information.when the security lamp remains steadily lit duringthe arming process.
8Q - 2 VEHICLE THEFT ALARM ZJ DIAGNOSISSELF-DIAGNOSIS (4) Rotate the key in each door lock cylinder to the A self-diagnosis mode is available in the VTA sys- lock position, then to the unlock position. The horntem to verify operation of all monitored switches or will sound as the switch closes, and again when itcircuits. To enter this mode, cycle the ignition switch opens. There must be a 1 second delay betweenACCESSORY-OFF-ACCESSORY-OFF-ACCESSORY, changing switch states, or the horn will not sound.leaving the switch in the ACCESSORY position. (5) Activate the remote keyless entry in both the Upon entering the self-diagnosis mode the head- lock and unlock directions. The horn will sound afterlamps, park and tail lamps will begin flashing to ver- each activation.ify their operation. In addition, the horn will sound (6) Cycle the ignition key to the ignition switch ONtwice. Returning the ignition to the OFF position will position. A single horn pulse will indicate proper op-stop the lamps from flashing while keeping the sys- eration of the ignition input. This also will take thetem in the diagnostic mode. module out of the diagnostic mode. Also note that vehicles equipped with VTA are The lack of a horn pulse response to any of theequipped with the illuminated entry system. When in above tests indicates:the diagnostic mode it is recommended that the illu- • a switch failureminated entry relay be removed. Otherwise, it is nec- • an open or shorted circuit between the switch andessary to wait 30 second for the illuminated entry the VTA modulesystem to time out after each door opening or clo- • an internal VTA module failure.sure. While in the diagnostic mode, a horn pulse should Check for continuity at the switch. If OK, check foroccur at each of the following events indicating an open or shorted wire between the switch and VTAproper operation. However, if a switch is cycled too module. Also, check if the powertrain control modulequickly and does not remain open or closed for at (PCM) has been replaced recently. For the first 20least 1 second, the horn will not sound to confirm op- engine starts with a new PCM, the VTA will functioneration. normally except for the engine no-run feature. (1) Beginning with all doors closed, open then close A PCM from a vehicle equipped with VTA can-each door. The horn will sound when the door jamb not be used in a vehicle that is not equippedswitch closes, and again when the switch opens. with VTA.There must be a 1 second delay between closing and If the security lamp comes on after ignitionopening the switch. ON and stays on, the CCD bus communication (2) Open, then close the hood. The horn will sound with the PCM has been lost.when the hood is opened, and again when it is closed. (3) Activate the power door locks in both the lockand unlock directions. The horn will sound after eachactivation.
8Q - 6 VEHICLE THEFT ALARM ZJ SERVICE PROCEDURESVTA MODULE REMOVE/INSTALL (9) Remove 3 screws above instrument panel clus- (1) Disconnect battery negative cable. ter holding dash pad (Fig. 3). (2) Remove ash receiver. (3) Remove 6 screws holding center cluster bezel(Fig. 1). Fig. 3 Remove Screws Holding Dash Pad (10) Open glove box and remove 2 screws holding dash pad (Fig. 4). Fig. 4 Remove Screws Holding Dash Pad Fig. 1 Remove Center Bezel Retaining Screws (11) Remove dash pad prying gently on each end to (4) Remove center bezel. unsnap end clips. (5) Remove 2 screws holding dash pad located be- (12) Remove 4 screws from bottom of glove box be-hind top of center bezel. zel (Fig. 5). (6) Gently pry defroster bezel out of dash pad. (7) Unplug automatic headlamp and sun sensors(if equipped) and set defroster grille aside. (8) Remove 4 screws in defroster duct openingholding dash pad (Fig. 2). Fig. 5 Right Side Bezel Attaching Screws Fig. 2 Upper Dash Pad Attaching Screws
ZJ VEHICLE THEFT ALARM 8Q - 7 (13) Remove 4 screws from top of glove box bezel(Fig. 6). Fig. 6 Right Side Bezel Upper Screws (14) Remove 1 screw holding the bezel to the cen- Fig. 8 VTA Module Remove/Installter console (Fig. 7). VTA MODULE RELAY REMOVE/INSTALL (1) Open glove box and remove 3 screws holding relay center cover (Fig. 9). Fig. 9 Relay Center Cover (2) Remove VTA module relay (Fig. 10). Fig. 7 Right Side Lower Screw (15) Remove side window demister boot from glovebox bezel. (16) Remove right side bezel from instrumentpanel. (17) Unplug glove box light and switch connector. (18) Remove 2 screws holding VTA module to in-strument panel (Fig. 8). (19) Pull module out and unplug connector. (20) Reverse removal procedures to install. Fig. 10 VTA Module Relay
8Q - 8 VEHICLE THEFT ALARM ZJ (3) To install, align relay terminals with cavities in (4) Remove screw from bottom of hand hold inrelay center and push relay into place. armrest. (4) Re-install relay center cover. (5) Remove the trim panel with a wide, flat-bladed tool (Fig. 12).HOOD SWITCH REMOVE/INSTALL To aid in removal of the trim panel, start at (1) Disconnect battery negative cable. the bottom of the panel. (2) Remove sheet metal screw securing switch to (6) Remove the plastic water shield.right inner fender (Fig. 11). (7) Remove the U-clip holding the lock cylinder and disarm switch (Figs. 13 and 14). Fig. 13 Lock Cylinder Remove Fig. 11 VTA Hood Switch (3) Disconnect wire from switch. (4) Remove switch. (5) Reverse removal procedures to install.DOOR DISARM SWITCH REMOVE/INSTALL (1) Remove screw from demister opening at frontof door. (2) Remove screw and door handle cover. (3) Remove screw from under armrest. Fig. 14 Door Disarm Switch - Typical Fig. 12 Trim Panel Remove
ZJ VEHICLE THEFT ALARM 8Q - 9 (8) Pull the lock cylinder out of the door. (9) Pry the door disarm switch off the back of thelock cylinder. (10) Remove harness clip from door sheet metal. (11) Unplug the harness connector and remove theswitch. (12) Reverse removal procedures to install.LIFTGATE DISARM SWITCH REMOVE/INSTALL (1) Remove 5 screws holding liftgate interior trimpanel. (2) Remove the trim panel with a wide, flat-bladedtool (Fig. 15). Fig. 16 Liftgate Disarm Switch (5) Reverse removal procedures to install. Fig. 15 Liftgate Trim Panel Remove To aid in removal of the trim panel, start atthe bottom of the panel. (3) Remove the disarm switch from the liftgatelock cylinder (Fig. 16). (4) Unplug the harness connector and remove theswitch.