Jeep Liberty KJ. Manual - part 273

problem between the Intrusion Transceiver Module (ITM) and the Body Control Module (BCM), or between the ITM
and the siren module. The BCM will also turn on the security indicator if it receives a message from the ITM indi-
cating that the ITM has stored a Diagnostic Trouble Code (DTC) for a siren module fault.

The hard wired VTA circuits and components may be diagnosed and tested using conventional diagnostic tools and
procedures. Refer to the appropriate wiring information. The wiring information includes wiring diagrams, proper wire
and connector repair procedures, details of wire harness routing and retention, connector pin-out information and
location views for the various wire harness connectors, splices and grounds.

However, conventional diagnostic methods may not prove conclusive in the diagnosis of the Body Control Module
(BCM), the ElectroMechanical Instrument Cluster (EMIC), the Intrusion Transceiver Module (ITM), the Programma-
ble Communications Interface (PCI) data bus, or the electronic message inputs used to provide the electronic fea-
tures of the VTA. The most reliable, efficient, and accurate means to diagnose the BCM, the EMIC, the ITM, the PCI
data bus, and the electronic message inputs for the VTA requires the use of a diagnostic scan tool. Refer to the
appropriate diagnostic information.

SENTRY KEY IMMOBILIZER SYSTEM

WARNING: To avoid personal injury or death, on vehicles equipped with airbags, disable the supplemental
restraint system before attempting any steering wheel, steering column, airbag, occupant classification sys-
tem, seat belt tensioner, impact sensor, or instrument panel component diagnosis or service. Disconnect
and isolate the battery negative (ground) cable, then wait two minutes for the system capacitor to discharge
before performing further diagnosis or service. This is the only sure way to disable the supplemental
restraint system. Failure to take the proper precautions could result in accidental airbag deployment.

The hard wired Sentry Key Immobilizer System (SKIS) components and circuits may be diagnosed and tested using
conventional diagnostic tools and procedures. Refer to the appropriate wiring information. The wiring information
includes wiring diagrams, proper wire and connector repair procedures, details of wire harness routing and retention,
connector pin-out information and location views for the various wire harness connectors, splices and grounds.

However, conventional diagnostic methods may not prove conclusive in the diagnosis of the Sentry Key REmote
Entry Module (SKREEM), the ElectroMechanical Instrument Cluster (EMIC), the Powertrain Control Module (PCM),
the Programmable Communications Interface (PCI) data bus, or the electronic message inputs used to provide the
electronic features of the SKIS. The most reliable, efficient, and accurate means to diagnose the SKREEM, the
EMIC, the PCM, the CAN data bus, and the electronic message inputs for the SKIS requires the use of a diagnostic
scan tool. Refer to the appropriate diagnostic information.

SENTRY KEY IMMOBILIZER SYSTEM DIAGNOSIS

CONDITION

POSSIBLE CAUSES

CORRECTION

SECURITY INDICATOR FAILS
TO LIGHT DURING BULB
TEST

1. Light-Emitting Diode (LED)
inoperative.

1. Perform the instrument cluster actuator
test. (Refer to 8 - ELECTRICAL/
INSTRUMENT CLUSTER - DIAGNOSIS
AND TESTING - ACTUATOR TEST).

2. Fuse inoperative.

2. Check the SKREEM fused B(+) fuse and
the fused ignition switch output (run-start)
fuse in the Junction Block (JB). Replace
fuses, if required.

3. Ground path inoperative.

3. Check for continuity to ground at the
connector for the SKREEM. Repair wiring, if
required.

4. Battery feed inoperative.

4. Check for battery voltage at the
connector for the SKREEM. Repair wiring, if
required.

5. Ignition feed inoperative.

5. Check for battery voltage at the
connector for the SKREEM with the ignition
switch in the ON position. Repair wiring, if
required.

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VEHICLE THEFT SECURITY - SERVICE INFORMATION

SENTRY KEY IMMOBILIZER SYSTEM DIAGNOSIS

CONDITION

POSSIBLE CAUSES

CORRECTION

SECURITY INDICATOR
FLASHES FOLLOWING BULB
TEST

1. Invalid key in ignition switch
lock cylinder.

1. Replace the key with a known valid key.

2. Key-related fault.

2. Use a diagnostic scan tool and the
appropriate diagnostic information for further
diagnosis.

SECURITY INDICATOR
LIGHTS SOLID FOLLOWING
BULB TEST

1. SKIS system malfunction/
fault detected.

1. Use a diagnostic scan tool and the
appropriate diagnostic information for further
diagnosis.

2. SKIS system inoperative.

2. Use a diagnostic scan tool and the
appropriate diagnostic information for further
diagnosis.

STANDARD PROCEDURE

SKIS INITIALIZATION

The Sentry Key Immobilizer System (SKIS) must be initialized following a Sentry Key REmote Entry Module
(SKREEM) replacement. SKIS initialization requires the use of a diagnostic scan tool. Initialization will also require
that you have access to the unique four-digit PIN code that was assigned to the original SKREEM. The PIN code
must be used to enter the Secured Access Mode in the SKREEM. This PIN number may be obtained from the
vehicle owner, from the original vehicle invoice, or from the DaimlerChrysler Customer Center. (Refer to 8 - ELEC-
TRICAL/ELECTRONIC CONTROL MODULES - STANDARD PROCEDURE - PCM/SKREEM PROGRAMMING).

NOTE: If a Powertrain Control Module (PCM) is replaced on a vehicle equipped with the Sentry Key Immo-
bilizer System (SKIS), the unique Secret Key data must be transferred from the Sentry Key REmote Entry
Module (SKREEM) to the new PCM using the PCM replacement procedure. This procedure also requires the
use of a diagnostic scan tool and the unique four-digit PIN code to enter the Secured Access Mode in the
SKREEM. Refer to the appropriate diagnostic information for the proper PCM replacement procedures.

SENTRY KEY TRANSPONDER PROGRAMMING

All Sentry Keys included with the vehicle are pre-programmed to work with the Sentry Key Immobilizer System
(SKIS) when it is shipped from the factory. The Sentry Key REmote Entry Module (SKREEM) can be programmed
to recognize up to a total of eight Sentry Keys. When programming a blank Sentry Key transponder, the key must
first be cut to match the ignition switch lock cylinder in the vehicle for which it will be used. Once the additional or
new key has been cut, the SKREEM must be programmed to recognize it as a valid key. There are two possible
methods to program the SKREEM to recognize a new or additional valid key, the Secured Access Method and the
Customer Learn Method. Following are the details of these two programming methods.

SECURED ACCESS METHOD

The Secured Access method applies to all vehicles. This method requires the use of a diagnostic scan tool. This
method will also require that you have access to the unique four-digit PIN code that was assigned to the original
SKREEM. The PIN code must be used to enter the Secured Access Mode in the SKREEM. This PIN number may
be obtained from the vehicle owner, from the original vehicle invoice, or from the DaimlerChrysler Customer Center.
(Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL MODULES - STANDARD PROCEDURE - PCM/SKREEM
PROGRAMMING).

CUSTOMER LEARN METHOD

The Customer Learn feature is only available on domestic vehicles, or those vehicles which have a U.S. country
code designator. This programming method also requires access to at least two valid Sentry Keys. If two valid Sen-
try Keys are not available, or if the vehicle does not have a U.S. country code designator, the Secured Access
Method must be used to program new or additional valid keys to the SKREEM. The Customer Learn programming
method procedures are as follows:

VEHICLE THEFT SECURITY - SERVICE INFORMATION

8Q - 69

1. Obtain the blank Sentry Key(s) that are to be programmed as valid keys for the vehicle. Cut the blank key(s) to

match the ignition switch lock cylinder mechanical key codes.

2. Insert one of the two valid Sentry Keys into the ignition switch and turn the ignition switch to the ON position.

3. After the ignition switch has been in the ON position for longer than three seconds, but no more than fifteen

seconds, cycle the ignition switch back to the OFF position. Replace the first valid Sentry Key in the ignition
switch lock cylinder with the second valid Sentry Key and turn the ignition switch back to the ON position. The
second valid Sentry Key must be inserted in the lock cylinder within fifteen seconds of removing the first valid
key.

4. About ten seconds after the completion of Step 3, the security indicator in the instrument cluster will start to flash

and a single audible chime will sound to indicate that the system has entered the Customer Learn programming
mode.

5. Within sixty seconds of entering the Customer Learn programming mode, turn the ignition switch to the OFF

position, replace the valid Sentry Key with a blank Sentry Key transponder, and turn the ignition switch back to
the ON position.

6. About ten seconds after the completion of Step 5, a single audible chime will sound and the security indicator will

stop flashing, stay on solid for three seconds, then turn off to indicate that the blank Sentry Key has been suc-
cessfully programmed. The SKIS will immediately exit the Customer Learn programming mode. After the ignition
is cycled the vehicle may be started using the newly programmed valid Sentry Key.

Each of these steps must be repeated and completed in their entirety for each additional Sentry Key that is to be
programmed. If the above steps are not completed in the given sequence, or within the allotted time, the SKIS will
exit the Customer Learn programming mode and the programming will be unsuccessful. The SKREEM will also
automatically exit the Customer Learn programming mode if it sees a non-blank Sentry Key transponder when it
should see a blank, if it has already programmed eight (8) valid Sentry Keys, or if the ignition switch is turned to the
OFF position for more than about fifty seconds.

NOTE: If an attempt is made to start the vehicle while in the Customer Learn mode (security indicator flash-
ing), the SKIS will respond as though the vehicle were being started with an invalid key. In other words, the
engine will stall after about two seconds of operation. No faults will be set.

NOTE: Once a Sentry Key has been programmed as a valid key to a vehicle, it cannot be programmed as a
valid key for use on any other vehicle.

SPECIFICATIONS

VEHICLE THEFT/SECURITY SYSTEMS

TORQUE SPECIFICATIONS

DESCRIPTION

N·m

Ft. Lbs.

In. Lbs.

Hood Ajar Switch Bracket

Mounting Screws

Steering Column Shroud

Mounting Screws

Alarm Siren Module

Bracket Mounting Screws

8Q - 70

VEHICLE THEFT SECURITY - SERVICE INFORMATION

HOOD AJAR SWITCH

DESCRIPTION

The hood ajar switch is a normally closed, single pole,
spring-loaded plunger actuated switch that is used
only on vehicles equipped with the Vehicle Theft Secu-
rity System (VTSS) for sale in certain export markets
where it is required equipment. The molded plastic
switch body (5) has an integral molded connector
receptacle (1) on the lower end containing two termi-
nal pins. The switch is connected to the vehicle elec-
trical system through a dedicated take out of the
headlamp and dash wire harness.

The switch plunger (3) extends through a mounting collar (4) and sleeve on the upper end of the switch body. The
sleeve has a one-time, self-adjustment feature that is activated after the switch is installed by closing the hood. Two
integral latches (2) lock the switch into a keyed mounting hole in the stamped steel switch mounting bracket. The
mounting bracket is secured with screws to the right inner fender shield near the fender ledge in the engine com-
partment.

A molded plastic striker (1) with an integral retainer (2)
and mounting tab (3) is secured to the underside of
the hood panel inner reinforcement to actuate the
switch plunger as the hood panel is closed.

An installed hood ajar switch cannot be readjusted or
repaired. If the switch is damaged, inoperative, or
requires readjustment, it must be replaced with a new
unit. The hood ajar switch striker is not intended for
reuse. If the striker is removed from the hood inner
reinforcement for any reason, it must be replaced with
a new unit.

OPERATION

The hood ajar switch is a normally closed switch that is held open as the spring-loaded switch plunger is depressed
by the striker on the hood panel when the hood panel is closed and latched. When the hood is opened, the spring-
loaded switch plunger extends from the switch body and the switch contacts are closed. The switch is connected in
series between ground and the hood ajar switch sense input of the Body Control Module (BCM). The BCM uses an
internal resistor pull up to monitor the state of the hood ajar switch contacts.

The components of the switch self-adjustment feature include an integral stop on the shaft of the plunger and a
ribbed, ratcheting sleeve at the top of the switch body from which the plunger extends. With the switch mounting
collar secured in its mounting bracket, the plunger is depressed by the striker on the hood inner reinforcement as

VEHICLE THEFT SECURITY - SERVICE INFORMATION

8Q - 71

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