VEHICLE THEFT/SECURITY SYSTEMS
TABLE OF CONTENTS
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DESCRIPTION AND OPERATION
VEHICLE THEFT/SECURITY SYSTEM (VTSS) ...1
SENTRY KEY IMMOBILIZER SYSTEM (SKIS) ...1
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
VEHICLE THEFT SECURITY SYSTEM
SELF-TESTS............................5
SERVICE PROCEDURES
SENTRY KEY IMMOBILIZER TRANSPONDER
PROGRAMMING ........................5
REMOVAL AND INSTALLATION
BODY CONTROL MODULE..................6
DECK LID SECURITY SWITCH...............6
LOCK CYLINDER SWITCH ..................6
SENTRY KEY IMMOBILIZER MODULE
(SKIM)................................7
DESCRIPTION AND OPERATION
VEHICLE THEFT/SECURITY SYSTEM (VTSS)
DESCRIPTION
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)
OPERATION
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, the doors do not
have to be locked to enable the fuel shut off feature.
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)
DESCRIPTION
The Sentry Key Immobilizer System (SKIS) is
designed to provide passive protection against unau-
thorized vehicle use by preventing the engine from
operating. The components of this system are the
Sentry Key Immobilizer Module (SKIM), Body Con-
trol Module (BCM), Sentry Key transponder, VTSS
LH VEHICLE THEFT/SECURITY SYSTEMS 8Q - 1
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