• Driver Door Module (DDM) - Refer to Door
Module in the Power Lock System section of Group
8P - Power Lock Systems for more information.
• Passenger Door Module (PDM) - Refer to
Door Module in the Power Lock System section of
Group 8P - Power Lock Systems for more informa-
tion.
Refer to Vehicle Theft Security System in the
Contents of Group 8W - Wiring Diagrams for com-
plete circuit diagrams. Following are general descrip-
tions of the features and major components of the
VTSS.
COMBINATION FLASHER
The combination flasher is a smart relay that func-
tions as both the turn signal system and the hazard
warning system flasher. The combination flasher con-
tains active electronic Integrated Circuitry (IC) ele-
ments. This flasher can be energized by the BCM to
flash all of the park/turn signal/front side marker
lamps as an optical alert for the VTSS alarm func-
tion. Refer to Combination Flasher in the proper
section of Group 8J - Turn Signal and Hazard Warn-
ing Systems for diagnosis and service of this compo-
nent.
HORN RELAY
The horn relay is a electromechanical device that
switches battery current to the horn when the horn
switch grounds the relay coil. The horn relay is
located in the Power Distribution Center (PDC) in
the engine compartment. This relay can be energized
by the BCM to sound the horns as an audible alert
for the VTSS alarm function. Refer to Horn Relay
in the proper section of Group 8G - Horn Systems for
diagnosis and service of this component.
LOW BEAM HEADLAMP RELAY
The low beam headlamp relay is a electromechan-
ical device that switches battery current to the head-
lamp low beams when the BCM grounds the relay
coil. The low beam headlamp relay is located in the
junction block in the passenger compartment. This
relay can be energized by the BCM to flash the head-
lamp low beams as an optical alert for the VTSS
alarm function. Refer to Low Beam Headlamp
Relay in the proper section of Group 8L - Lamps for
diagnosis and service of this component.
OPERATION
A Body Control Module (BCM) is used on this
model to control and integrate many of the electronic
functions and features included in the VTSS. In the
VTSS, the BCM receives inputs indicating the status
of the door ajar switch, the driver cylinder lock
switch, the ignition switch, the liftgate ajar switch,
and the liftgate flip-up glass ajar switch. The pro-
gramming in the BCM allows it to process the infor-
mation from all of these inputs and send control
outputs to energize or de-energize the combination
flasher, the horn relay, the low beam headlamp relay,
and the auto headlamp light sensor/VTSS Light
Emitting Diode (LED).
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
The Vehicle Theft Security System (VTSS) features
are provided by the BCM located in the passenger
compartment. The BCM must have the VTSS func-
tions electronically enabled in order for the VTSS to
perform as designed. The logic in the BCM keeps its
VTSS features dormant until it is enabled using a
DRB scan tool. The VTSS features of the BCM are
enabled on vehicles equipped with the VTSS option
at the factory, but a service replacement BCM must
be enabled by the dealer with a DRB scan tool any-
time the BCM is replaced with a new unit. See the
proper Diagnostic Procedures manual for more infor-
mation on enabling the BCM VTSS feature.
ARMING
Passive arming of the VTSS occurs when the vehi-
cle is exited with the key removed from the ignition
switch, the headlamps are turned off, and the doors
are locked while they are open using the power lock
switch. The power lock switch will not function if the
key is in the ignition switch or the headlamps are on
with the driver side front door open. The VTSS will
not arm if the driver side front door is locked using
the key in the lock cylinder or using the mechanical
lock button.
Active arming of the VTSS occurs when the
Remote Keyless Entry (RKE) transmitter is used to
lock the vehicle, even if the doors and/or the liftgate
are open when the RKE transmitter Lock button is
depressed. However, the VTSS arming will not be
complete until all of the doors, the liftgate and the
liftgate flip-up glass are closed. Refer to Remote
Keyless Entry System in the Remote Keyless Entry
System section of Group 8P - Power Lock Systems for
more information on the RKE system components.
Following successful passive or active VTSS arm-
ing, the VTSS LED on the top of the instrument
panel will flash rapidly for about fifteen seconds after
the illuminated entry system times out. This indi-
cates that VTSS arming is in progress. Once the fif-
teen
second
arming
function
is
successfully
completed, the set lamp will flash at a slower rate to
indicate that the VTSS is armed.
8Q - 2
VEHICLE THEFT/SECURITY SYSTEMS
WJ
DESCRIPTION AND OPERATION (Continued)