Chrysler New Yorker. Manual — part 103

When the RKE lock button is pressed, the BCM

will also pulse the horn. This is part of the RKE nor-
mal operation.

REMOVAL AND INSTALLATION

BODY CONTROL MODULE

For service of the Body Control Module (BCM),

refer to Group 8E, Instrument Panel and Systems for
Removal and Installation procedures.

DOOR LOCK DISARMING SWITCH

REMOVAL

(1) Refer to Group 23, Body for door trim and

water shield removal.

(2) Disconnect wiring clip and pigtail wire connec-

tor (Fig. 1).

(3) Remove central locking switch from door lock

cylinder.

INSTALLATION

For installation, reverse the above procedures.

DECK LID LOCK SWITCH

REMOVAL

(1) Refer to Group 23, Body for deck lid lock cylin-

der removal.

(2) Disconnect connector (Fig. 2) and remove deck

lid lock cylinder from bracket.

INSTALLATION

For installation reverse the above procedures.

Fig. 1 Central Locking Switch

Fig. 2 Deck Lid Lock Switch

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DIAGNOSIS AND TESTING (Continued)

VEHICLE THEFT/SECURITY SYSTEM

CONTENTS

page

page

GENERAL INFORMATION

INTRODUCTION . . . . . . . . . . . . . . . . . . . . . . . . . 1
SENTRY KEY IMMOBILIZER SYSTEM (SKIS) . . 1

DESCRIPTION AND OPERATION

SENTRY KEY IMMOBILIZER MODULE (SKIM) . 2
SENTRY KEY IMMOBILIZER SYSTEM

INDICATOR LAMP . . . . . . . . . . . . . . . . . . . . . . 3

SENTRY KEY IMMOBILIZER TRANSPONDER . . 3
TRIGGERING THE VTSS . . . . . . . . . . . . . . . . . . . 4

DIAGNOSIS AND TESTING

SENTRY KEY IMMOBILIZER SYSTEM (SKIS) . . 4

SERVICE PROCEDURES

SENTRY KEY IMMOBILIZER TRANSPONDER

PROGRAMMING . . . . . . . . . . . . . . . . . . . . . . . 4

REMOVAL AND INSTALLATION

DECK LID SECURITY SWITCH . . . . . . . . . . . . . . 5
SENTRY KEY IMMOBILIZER MODULE (SKIM) . 5

GENERAL INFORMATION

INTRODUCTION

The Vehicle Theft Security System (VTSS) is

designed to protect against whole vehicle theft. The
system monitors vehicle doors, deck lid key cylinder,
and ignition action for unauthorized operation. The
alarm activates:

• Sounding of the horn

• Flashing of the park and tail lamps

• Flashing of the headlamps

• An engine kill feature (without SKIS)
Upon failure of proper VTSS/SKIM communication

to the PCM, the PCM will shut off fuel after two sec-
onds of run time. The engine will not re-crank on the
key cycle that the failure occurred, a full key down
sequence must be performed for the engine to crank
again. After six consecutive fuel shut-offs, the engine
will no longer crank on subsequent key cycles. The
failure must be corrected and a valid communication
process between the BCM (VTSS), or SKIM, and the
PCM must occur for the engine to crank and start
again.

The electronics for the VTSS are part of the Body

Control Module (BCM). The system is armed when
the vehicle is locked using the:

• Power door lock switches

• Remote Keyless Entry transmitter.
For vehicles equipped with SKIS, there is no arm-

ing sequence required.

After the vehicle is locked and the last door is

closed, the set LED indicator in the top cover will

flash quickly for 16 seconds, indicating that arming
is in progress. If no monitored systems are activated
during this period, the system will arm. After 16 sec-
onds the indicator LED will continue to flash at a
slower rate.

This indicates that the system is armed. If the

deck lid key cylinder switch is not sensed by the sys-
tem, the indicator LED will remain lit during the
arming process, although the system will still arm. If
the indicator LED does not illuminate at all upon
door closing it indicates that the system is not arm-
ing.

Passive disarming occurs upon normal vehicle

entry by unlocking either door with the ignition key/
remote transmitter. This disarming will also halt the
alarm once it has been activated.

A tamper alert exists to notify the driver that the

VTSS had been activated. This alert consists of 3
horn pulses when the vehicle is disarmed.

The VTSS will not arm by pushing down the door

lock mechanism. This will manually override the sys-
tem.

SENTRY KEY IMMOBILIZER SYSTEM (SKIS)

The Sentry Key Immobilizer System (SKIS) is

designed to provide passive protection against unau-
thorized vehicle use by preventing the engine from
operating while the system is armed. The primary
components of this system are the Sentry Key Immo-
bilizer Module (SKIM), Body Control Module (BCM),
Sentry Key transponder, VTSS indicator LED, and
the Powertrain Control Module (PCM).

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The SKIM is installed on the steering column near

the ignition lock cylinder (Fig. 1). The transponder is
located under the molded rubber cap on the head of
the ignition key. The VTSS indicator LED is located
in the instrument panel top cover.

The SKIS includes two valid Sentry Key transpon-

ders from the factory. This is so the customer can self
program new keys if one is lost. If the customer
wishes, additional 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 transponder 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 (DTC’s) 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 Body Diagnostic
Procedures manual.

DESCRIPTION AND OPERATION

SENTRY KEY IMMOBILIZER MODULE (SKIM)

The Sentry Key Immobilizer Module (SKIM) (Fig.

2) contains a Radio Frequency (RF) transceiver and a
central 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 more than eight electronically coded Sentry Key
transponders. The SKIS programming also enables
the SKIM to communicate over the Programmable
Communication Interface (PCI) bus network with the
Powertrain Control Module (PCM), 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 (Fig. 1). This antenna ring must be located
within eight millimeters (0.31 inches) of the Sentry
Key in order to ensure proper RF 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 PCI 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 secu-
rity 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 Identification Number
(VIN), which it learns through a PCI bus message
from the PCM during initialization.

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
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 PCI bus. If the SKIM receives an

Fig. 1 Sentry Key Immobilizer Module Location

Fig. 2 Sentry Key Immobilizer Module

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GENERAL INFORMATION (Continued)

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 BCM which

controls the VTSS indicator LED. The SKIM sends
messages to the BCM to turn the LED 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 LED off for a duration of about one second. Then
the SKIM sends messages to turn the LED on or off
based upon the results of the SKIS self-tests. If the
VTSS indicator LED 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 when the igni-

tion switch is turned to the ON position, it sends
messages to flash the VTSS indicator LED. The
SKIM can also send messages to flash the LED and
to generate a single audible chime tone. These func-
tions serve as an indication to the customer that the
SKIS has been placed in its “Customer Learn” pro-
gramming mode. See Sentry Key Immobilizer System
Transponder Programming in this section for more
information on the “Customer Learn” programming
mode.

For diagnosis or initialization of the SKIM and the

PCM, a DRB scan tool and the proper Body Diagnos-
tic Procedures manual are required. The SKIM can-
not be repaired and, if faulty or damaged, the unit
must be replaced.

SENTRY KEY IMMOBILIZER SYSTEM INDICATOR
LAMP

The Sentry Key Immobilizer System (SKIS) uses

the Vehicle Theft Security System (VTSS) indicator
LED to give an indication when the SKIS is faulty or
when the vehicle has been immobilized due to the
use of an invalid ignition key. The LED is controlled
by the BCM based upon messages received from the
Sentry Key Immobilizer Module (SKIM). The VTSS/
SKIS indicator LED is hardwired directly to the
BCM.

The SKIM sends messages to the BCM to turn the

LED 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 the BCM to keep the LED off for a
duration of about one second. Then the SKIM sends
messages to the BCM to turn the LED on or off
based upon the results of the SKIS self-tests. If the
VTSS indicator LED 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 when
the ignition switch is turned to the ON position, it
sends messages to the BCM to flash the VTSS indi-
cator LED.

The SKIM can also send messages to the BCM to

flash the LED and to generate a single audible chime
tone. These functions serve as an indication to the
customer that the SKIS has been placed in its “Cus-
tomer Learn” programming mode. See Sentry Key
Immobilizer System Transponder Programming in
this section for more information on the “Customer
Learn” programming mode.

The VTSS indicator LED is housed in the Auto-

matic Temperature Control (ATC) Sun Sensor located
in the instrument panel top cover. Refer to Group 8E
- Instrument Panel and Systems for service of ATC
Sun Sensor. If the VTSS indicator LED comes on and
stays on after the bulb test function, diagnosis of the
SKIS should be performed with a DRB scan tool and
the proper Body Diagnostic Procedures manual.

SENTRY KEY IMMOBILIZER TRANSPONDER

The Sentry Key Immobilizer System (SKIS) uses a

transponder that is integral to each of two ignition
key 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. 3).

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-

Fig. 3 Sentry Key Immobilizer Transponder

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DESCRIPTION AND OPERATION (Continued)