VEHICLE THEFT/SECURITY SYSTEMS
TABLE OF CONTENTS
page page
GENERAL INFORMATION
INTRODUCTION ..........................1
VEHICLE THEFT SECURITY SYSTEM..........1
ENABLING...............................1
ARMING ................................1
DISARMING .............................2
POWER-UP MODE ........................2
TAMPER ALERT ..........................2
DESCRIPTION AND OPERATION
CENTRAL TIMER MODULE .................2
DOOR AJAR SWITCH......................3
LIFTGATE AJAR SWITCH ...................3
DOOR LOCK CYLINDER SWITCH.............3
LIFTGATE LOCK CYLINDER SWITCH..........3
HEADLAMP RELAY........................3
HORN RELAY ............................4
SECURITY LAMP .........................4
DIAGNOSIS AND TESTING
VEHICLE THEFT SECURITY SYSTEM..........4
DOOR LOCK CYLINDER SWITCH.............4
LIFTGATE LOCK CYLINDER SWITCH..........4
RELAYS.................................5
REMOVAL AND INSTALLATION
DOOR AJAR SWITCH......................5
LIFTGATE AJAR SWITCH ...................5
DOOR LOCK CYLINDER SWITCH.............5
LIFTGATE LOCK CYLINDER SWITCH..........5
HEADLAMP RELAY........................6
HORN RELAY ............................7
GENERAL INFORMATION
INTRODUCTION
The Vehicle Theft Security System (VTSS) is an
available factory-installed option on this model. Refer
to 8W-39 - Vehicle Theft Security System in Group
8W - Wiring Diagrams for complete circuit descrip-
tions and diagrams.
VEHICLE THEFT SECURITY SYSTEM
The Vehicle Theft Security System (VTSS) is
designed to provide perimeter protection against
unauthorized use or tampering by monitoring the
vehicle doors and the ignition system. If unautho-
rized use or tampering is detected, the system
responds by sounding the horn, flashing the head-
lamps, and providing an engine no-run feature.
Following are general descriptions of the features
and major components of the VTSS. Refer to the
owner’s manual in the vehicle glove box for more
information on the features, use and operation of the
vehicle theft security system.
ENABLING
If the vehicle is so equipped, the Vehicle Theft
Security System (VTSS) feature is enabled in the
high-line Central Timer Module (CTM) before the
vehicle is shipped from the factory. However, if a
vehicle with VTSS requires CTM replacement, the
VTSS feature must be enabled in the new CTM using
a DRB scan tool. Refer to the Vehicle Theft Security
System menu item on the DRB scan tool for the pro-
cedures.
The VTSS engine no-run feature is disabled when
it is shipped from the factory. This is done by pro-
gramming within the Powertrain Control Module
(PCM). The logic in the PCM prevents the VTSS
engine no-run feature from arming until the engine
start counter within the PCM sees twenty engine
starts. The VTSS no-run feature must be enabled
when the vehicle is received from the assembly plant.
Once the VTSS engine no-run feature has been
enabled, it cannot be disabled unless the PCM is
replaced with a new unit. The same VTSS engine no-
run feature enable logic will apply anytime the PCM
is replaced with a new unit.
ARMING
Passive arming of the Vehicle Theft Security Sys-
tem (VTSS) occurs when the vehicle is exited with
the key removed from the ignition switch, the head-
lamps are turned off, and the doors and liftgate are
locked while they are open using the power lock
switch or locked after they are closed by turning
either front door lock cylinder or the liftgate lock cyl-
inder to the lock position using the key. Passive arm-
ing will not begin until all the doors and the liftgate
are closed. The power lock switch will not function if
the key is in the ignition switch or the headlamps
are turned on with the driver side front door open.
DN VEHICLE THEFT/SECURITY SYSTEMS 8Q - 1
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