Jeep 1997 Grand Cherokee Service Manual page 551

ZG
VEHICLE THEFT/SECURITY SYSTEMS
GENERAL INFORMATION
ARMING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
DISARMING . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
ENABLING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
INTRODUCTION . . . . . . . . . . . . . . . . . . . . . . . . 1
POWER-UP MODE
TAMPER ALERT . . . . . . . . . . . . . . . . . . . . . . . . . 3
DESCRIPTION AND OPERATION
AUTO HEADLAMP RELAY . . . . . . . . . . . . . . . . . 4
BODY CONTROL MODULE . . . . . . . . . . . . . . . . 3
DOOR AJAR SWITCH
DOOR LOCK CYLINDER SWITCH . . . . . . . . . . . 4
HORN RELAY . . . . . . . . . . . . . . . . . . . . . . . . . . 4
LIFTGATE AJAR SWITCH
LIFTGATE LOCK CYLINDER SWITCH . . . . . . . . 4
LIFTGLASS AJAR SWITCH
GENERAL INFORMATION
INTRODUCTION
The Vehicle Theft Security System (VTSS) is an
available factory-installed option on versions of this
model built for sale in North America. This system is
designed to provide perimeter protection against
unauthorized use or tampering by monitoring the
vehicle doors, liftgate, and ignition system. If unau-
thorized use or tampering is detected, the system
responds by sounding the horn, flashing the exterior
lamps, and providing an engine no-run feature. The
VTSS can be disarmed by unlocking the vehicle with
the key in either front door lock cylinder or using the
Remote Keyless Entry (RKE) transmitters.
The vehicle immobilizer system is factory-installed
standard equipment on models built for sale outside
North America. Models equipped with the vehicle
immobilizer system cannot be equipped with the
VTSS. The vehicle immobilizer system is designed to
provide passive protection against unauthorized vehi-
cle use by preventing the engine from operating
while the system is armed. The vehicle immobilizer
system can only be disarmed using the Remote Key-
less Entry (RKE) transmitters.
Following are some general descriptions of the fea-
tures of the VTSS and the vehicle immobilizer sys-
tem. Refer to the vehicle owner's manual for more
information on the use and operation of these sys-
tems. Refer to Group 8P - Power Lock Systems for
more information on the RKE system receiver and
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VEHICLE THEFT/SECURITY SYSTEMS
CONTENTS
page
PARK LAMP RELAY . . . . . . . . . . . . . . . . . . . . . . 4
SET LAMP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
DIAGNOSIS AND TESTING
RELAYS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
VEHICLE THEFT SECURITY SYSTEM OR
VEHICLE IMMOBILIZER SYSTEM . . . . . . . . . . 5
REMOVAL AND INSTALLATION
AUTO HEADLAMP AND PARK LAMP RELAYS . . 8
DOOR AJAR SWITCH
DOOR LOCK CYLINDER SWITCH . . . . . . . . . . . 6
HORN RELAY
LIFTGATE AJAR SWITCH
LIFTGATE LOCK CYLINDER SWITCH . . . . . . . . 7
LIFTGLASS AJAR SWITCH
SET LAMP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
transmitters. Refer to 8W-39 - Vehicle Theft Security
System in Group 8W - Wiring Diagrams for complete
circuit descriptions and diagrams.
NOTE: This group covers both Left-Hand Drive
(LHD) and Right-Hand Drive (RHD) versions of this
model. Whenever required and feasible, the RHD
versions of affected vehicle components have been
constructed as mirror-image of the LHD versions.
While most of the illustrations used in this group
represent only the LHD version, the diagnostic and
service procedures outlined can generally be
applied to either version. Exceptions to this rule
have been clearly identified as LHD or RHD, if a
special illustration or procedure is required.
ENABLING
VEHICLE THEFT SECURITY SYSTEM
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.
The preferred method for enabling the VTSS
engine no-run feature is to electronically advance the
PCM engine start counter using a DRB scan tool.
Refer to the Vehicle Theft Security System menu
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8Q - 1
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