Dodge Durango (DN). Manual — part 316

The VTSS will not arm if the doors are 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. For active arming to occur, the doors
and liftgate must be closed and the ignition switch
must be in the Off position when the RKE transmit-
ter Lock button is depressed. However, once the
VTSS arming process has been completed, the igni-
tion switch can be turned to the Accessory position
without triggering the alarm.

Once the VTSS begins passive or active arming,

the security lamp in the instrument cluster will flash
rapidly for about fifteen seconds. This indicates that
the VTSS arming is in progress. Turning a key in the
ignition switch, opening a door or the liftgate, or
unlocking a door or the liftgate by any means during
the fifteen second arming process will cause the secu-
rity lamp to stop flashing and the arming process to
abort. Once the fifteen second arming function is suc-
cessfully completed, the security lamp will flash at a
slower rate to indicate that the VTSS is armed.

DISARMING

Passive disarming of the Vehicle Theft Security

System (VTSS) occurs when the vehicle is unlocked
using the key to unlock either front door or the lift-
gate. Active disarming of the VTSS occurs when the
vehicle is unlocked by depressing the Unlock button
of the Remote Keyless Entry (RKE) transmitter.

Once the alarm has been activated (horn sounding,

headlamps flashing, and the engine no-run feature),
either disarming method will also deactivate the
alarm.

POWER-UP MODE

When the armed Vehicle Theft Security System

(VTSS) senses that the battery has been disconnected
and reconnected, it enters its power-up mode. In the
power-up mode the alarm system remains armed fol-
lowing a battery failure or disconnect. If the VTSS
was armed prior to a battery disconnect or failure,
the system will have to be actively or passively dis-
armed after the battery is reconnected.

The power-up mode will also apply if the battery

goes dead while the system is armed, and battery
jump-starting is attempted. The engine no-run fea-
ture will prevent the engine from starting until the
alarm system has been actively or passively dis-
armed.

TAMPER ALERT

The Vehicle Theft Security System (VTSS) tamper

alert will sound the horn three times upon disarm-
ing, if the alarm was triggered and has since timed-

out (about fifteen minutes). This feature alerts the
vehicle operator that the VTSS was activated while
the vehicle was unattended.

DESCRIPTION AND OPERATION

CENTRAL TIMER MODULE

Two versions of the Central Timer Module (CTM)

are available on this vehicle, a base version and a
high-line version. The base version of the CTM is
used on base models of the vehicle. The base version
of the CTM combines the functions of a chime/buzzer
module, an intermittent wipe module and an illumi-
nated entry module into a single unit. The base CTM
also uses inputs from the door ajar switches, the
headlamp switch and the key-in ignition switch to
control the output to the dome lamp circuits, which
allows the base CTM to provide load shedding to help
protect the battery from becoming discharged.

The high-line version of the CTM is used on high-

line vehicles. The high-line CTM provides all of the
functions of the base version CTM, but also is used to
control and integrate many of the additional elec-
tronic functions and features included on the high-
line models. The high-line version of the CTM
contains a central processing unit and interfaces with
other modules in the vehicle on the Chrysler Colli-
sion Detection (CCD) data bus network.

The CCD data bus network allows the sharing of

sensor information. This helps to reduce wire har-
ness complexity, reduce internal controller hardware,
and reduce component sensor current loads. At the
same time, this system provides increased reliability,
enhanced diagnostics, and allows the addition of
many new feature capabilities.

One of the features that the high-line CTM sup-

ports and controls is the Vehicle Theft Security Sys-
tem (VTSS). In the VTSS, the CTM receives hard-
wired inputs from the door and liftgate ajar, door and
liftgate lock cylinder, and ignition switches. The pro-
gramming in the CTM allows it to process the infor-
mation from these inputs and send control outputs to
energize or de-energize the headlamp (or security)
relay, horn relay, and the security lamp. The CTM
also sends CCD data bus messages to the Powertrain
Control Module (PCM) to control the engine no-run
feature of the VTSS

The high-line CTM also contains the receiver and

control logic for the power lock and Remote Keyless
Entry (RKE) systems, which are integrated into the
arming, disarming, and triggering functions of the
VTSS.

Both versions of the CTM are mounted under the

passenger side end of the instrument panel, outboard
of the instrument panel glove box opening. Refer to
Central Timer Module in the Removal and Installa-

8Q - 2

VEHICLE THEFT/SECURITY SYSTEMS

DN

GENERAL INFORMATION (Continued)

tion section of Group 8E - Instrument Panel Systems
for the service procedures.

For diagnosis of the high-line version of the CTM

or of the CCD data bus, a DRB scan tool and the
proper Diagnostic Procedures manual are recom-
mended. The CTM cannot be repaired and, if faulty
or damaged, it must be replaced.

DOOR AJAR SWITCH

The door ajar switches are integral to the door

latches on each door. The switches close a path to
ground for the Central Timer Module (CTM) when a
door is opened, and open the ground path when a
door is closed.

The door ajar switches cannot be repaired and, if

faulty or damaged, the door latch unit must be
replaced.

LIFTGATE AJAR SWITCH

The liftgate ajar switch is integral to the latch on

the liftgate. The switch closes a path to ground for
the Central Timer Module (CTM) when the liftgate is
opened, and opens the ground path when the liftgate
is closed.

The liftgate ajar switch cannot be repaired and, if

faulty or damaged, the liftgate latch unit must be
replaced.

DOOR LOCK CYLINDER SWITCH

DESCRIPTION

The door lock cylinder switches are mounted to the

back of the key lock cylinder inside each front door.
They are resistor multiplexed momentary switches
that are hard wired between a body ground and the
Central Timer Module (CTM) through the front door
wire harnesses. These switches are driven by the key
lock cylinders and contain three internal resistors.
One resistor is used for the neutral switch position,
one for the lock position and one for the unlock posi-
tion.

The door lock cylinder switches cannot be adjusted

or repaired and, if faulty or damaged, they must be
replaced. For complete circuit diagrams, refer to
Vehicle Theft Security System in the Contents of
Group 8W - Wiring Diagrams.

OPERATION

The door lock cylinder switches are actuated by the

key lock cylinder when the key is inserted in the lock
cylinder and turned to the lock or unlock positions.
The door lock cylinder switch closes a path to ground
through one of three internal resistors for the CTM
when the front door key lock cylinder is in the lock,
unlock or neutral positions. The CTM reads the
switch status through an internal pull-up, then uses

this input and its internal programming to control
the proper Vehicle Theft Security System (VTSS) and
power lock system outputs.

LIFTGATE LOCK CYLINDER SWITCH

DESCRIPTION

The liftgate lock cylinder switch is mounted to the

back of the liftgate key lock cylinder inside the lift-
gate. It is a resistor multiplexed momentary switch
that is hard wired between a body ground and the
Central Timer Module (CTM) through the liftgate
wire harness. This switch is driven by the key lock
cylinder and contains three internal resistors. One
resistor is used for the neutral switch position, one
for the lock position and one for the unlock position.

The liftgate lock cylinder switch cannot be adjusted

or repaired and, if faulty or damaged, it must be
replaced. For complete circuit diagrams, refer to
Vehicle Theft Security System in the Contents of
Group 8W - Wiring Diagrams.

OPERATION

The liftgate lock cylinder switch is actuated by the

key lock cylinder when the key is inserted in the lock
cylinder and turned to the lock or unlock positions.
The liftgate lock cylinder switch closes a path to
ground through one of three internal resistors for the
CTM when the liftgate key lock cylinder is in the
lock, unlock or neutral positions. The CTM reads the
switch status through an internal pull-up, then uses
this input and its internal programming to control
the proper Vehicle Theft Security System (VTSS) and
power lock system outputs.

HEADLAMP RELAY

The headlamp (or security) relay is a International

Standards Organization (ISO) micro-relay. The termi-
nal designations and functions are the same as a con-
ventional

ISO

relay.

However,

the

micro-relay

terminal orientation (or footprint) is different, cur-
rent capacity is lower, and the relay case dimensions
are smaller than those of the conventional ISO relay.

The headlamp relay is a electromechanical device

that switches battery current to the headlamps when
the high-line Central Timer Module (CTM) grounds
the relay coil. See Headlamp Relay in the Diagnosis
and Testing section of this group for more informa-
tion.

The headlamp relay is located in the Power Distri-

bution Center (PDC), behind the battery on the left
side of the engine compartment.

The headlamp relay cannot be repaired and, if

faulty or damaged, it must be replaced.

DN

VEHICLE THEFT/SECURITY SYSTEMS

8Q - 3

DESCRIPTION AND OPERATION (Continued)

HORN RELAY

The horn relay is a International Standards Orga-

nization (ISO) micro-relay. The terminal designations
and functions are the same as a conventional ISO
relay. However, the micro-relay terminal orientation
(or footprint) is different, current capacity is lower,
and the relay case dimensions are smaller than those
of the conventional ISO relay.

The horn relay is a electromechanical device that

switches battery current to the horn when the horn
switch or the high-line Central Timer Module (CTM)
grounds the relay coil. Refer to Relays in the Diag-
nosis and Testing section of this group for more infor-
mation.

The horn relay is located in the Junction Block

(JB), on the left end of the instrument panel in the
passenger compartment. See the fuse and relay lay-
out label on the inside of the fuse access panel for
relay identification and location.

If a problem is encountered with a continuously

sounding horn, it can usually be quickly resolved by
removing the horn relay from the JB until further
diagnosis is completed.

The horn relay cannot be repaired and, if faulty or

damaged, it must be replaced.

SECURITY LAMP

The security lamp is located within the instrument

cluster on the instrument panel. The security lamp is
illuminated by a red Light-Emitting Diode (LED)
that is integral to the instrument cluster circuit
board. The security lamp receives fused battery feed
at all times and is grounded by the high-line Central
Timer Module (CTM) to give a visual indication of
the Vehicle Theft Security System (VTSS) arming
status.

The security lamp cannot be repaired and, if faulty

or damaged, the instrument cluster unit must be
replaced. Refer to Instrument Cluster in the Removal
and Installation section of Group 8E - Instrument
Panel Systems for the service procedures.

DIAGNOSIS AND TESTING

VEHICLE THEFT SECURITY SYSTEM

WARNING: ON VEHICLES EQUIPPED WITH AIR-
BAGS,

REFER

TO

GROUP

8M

-

PASSIVE

RESTRAINT SYSTEMS BEFORE ATTEMPTING ANY
STEERING

WHEEL,

STEERING

COLUMN,

OR

INSTRUMENT PANEL COMPONENT DIAGNOSIS OR
SERVICE. FAILURE TO TAKE THE PROPER PRE-
CAUTIONS COULD RESULT IN ACCIDENTAL AIR-
BAG DEPLOYMENT AND POSSIBLE PERSONAL
INJURY.

The Vehicle Theft Security System (VTSS) and the

Chrysler Collision Detection (CCD) data bus network
should be diagnosed using a DRB scan tool and the
proper Diagnostic Procedures manual. The DRB will
provide confirmation that the data bus is functional,
that the high-line Central Timer Module (CTM) is
receiving and sending the proper messages on the
data bus, that the CTM is receiving the proper hard-
wired inputs and sending the proper hard-wired out-
puts, and that the Powertrain Control Module (PCM)
is receiving the data bus messages from the CTM.
Refer to the Vehicle Theft Security System menu
item on the DRB scan tool for the procedures. Refer
to 8W-39 - Vehicle Theft Security System in Group
8W - Wiring Diagrams for complete circuit descrip-
tions and diagrams.

DOOR LOCK CYLINDER SWITCH

Refer to Vehicle Theft Security System in the

index of this service manual for the location of com-
plete door lock cylinder switch wiring diagrams.

(1) Disconnect the door lock cylinder switch wire

harness connector from the door wire harness con-
nector.

(2) Using an ohmmeter, perform the switch resis-

tance checks between the two cavities of the door
lock cylinder switch wire harness connector. Actuate
the switch by rotating the key in the door lock cylin-
der to test for the proper resistance values in each of
the three switch positions, as shown in the Door Lock
Cylinder Switch chart.

(3) If a door lock cylinder switch fails any of the

resistance

tests,

replace

the

faulty

switch

as

required.

LIFTGATE LOCK CYLINDER SWITCH

Refer to Vehicle Theft Security System in the

index of this service manual for the location of com-
plete liftgate lock cylinder switch wiring diagrams.

(1) Disconnect the likftgate lock cylinder switch

wire harness connector from the liftgate wire harness
connector.

DOOR LOCK CYLINDER SWITCH

Switch Position

Resistance

Driver Side

Passenger Side

Neutral

Neutral

12 Kilohms

Lock (Clockwise)

Lock (Counter

Clockwise)

644 Ohms

Unlock (Counter

Clockwise)

Unlock

(Clockwise)

1565 Ohms

8Q - 4

VEHICLE THEFT/SECURITY SYSTEMS

DN

DESCRIPTION AND OPERATION (Continued)

(2) Using an ohmmeter, perform the switch resis-

tance checks between the two cavities of the liftgate
lock cylinder switch wire harness connector. Actuate
the switch by rotating the key in the liftgate lock cyl-
inder to test for the proper resistance values in each
of the three switch positions, as shown in the Lift-
gate Lock Cylinder Switch chart.

(3) If a liftgate lock cylinder switch fails any of the

resistance

tests,

replace

the

faulty

switch

as

required.

RELAYS

The headlamp (or security) and horn relays are

located in the Power Distribution Center (PDC) in
the engine compartment. Each of these relays can be
tested as described in the following procedure, how-
ever the circuits they are used in do vary. To test the
relay circuits, refer to the circuit descriptions and
diagrams in 8W-39 - Vehicle Theft Security System
in Group 8W - Wiring Diagrams.

WARNING: ON VEHICLES EQUIPPED WITH AIR-
BAGS,

REFER

TO

GROUP

8M

-

PASSIVE

RESTRAINT SYSTEMS BEFORE ATTEMPTING ANY
STEERING

WHEEL,

STEERING

COLUMN,

OR

INSTRUMENT PANEL COMPONENT DIAGNOSIS OR
SERVICE. FAILURE TO TAKE THE PROPER PRE-
CAUTIONS COULD RESULT IN ACCIDENTAL AIR-
BAG DEPLOYMENT AND POSSIBLE PERSONAL
INJURY.

Remove the relay (Fig. 1) from the PDC as

described in this group to perform the following tests:

(1) A relay in the de-energized position should

have continuity between terminals 87A and 30, and
no continuity between terminals 87 and 30. If OK, go
to Step 2. If not OK, replace the faulty relay.

(2) Resistance between terminals 85 and 86 (elec-

tromagnet) should be 75

6 5 ohms. If OK, go to Step

3. If not OK, replace the faulty relay.

(3) Connect a battery to terminals 85 and 86.

There should now be continuity between terminals
30 and 87, and no continuity between terminals 87A
and 30. If OK, test the relay circuits. If not OK,
replace the faulty relay.

REMOVAL AND INSTALLATION

DOOR AJAR SWITCH

The door ajar switch is integral to the door latch

unit. If the door ajar switch is faulty or damaged, the
entire door latch unit must be replaced. Refer to
Group 23 - Body for the door latch service proce-
dures.

LIFTGATE AJAR SWITCH

The liftgate ajar switch is integral to the liftgate

latch unit. If the liftgate ajar switch is faulty or dam-
aged, the entire liftgate latch unit must be replaced.
Refer to Group 23 - Body for the liftgate latch service
procedures.

DOOR LOCK CYLINDER SWITCH

(1) Disconnect and isolate the battery negative

cable.

(2) Remove the door outside latch handle mount-

ing hardware and linkage from the inside of the door.
Refer to Group 23 - Body for the procedures.

(3) From the outside of the door, pull the door out-

side latch handle out far enough to access the door
lock cylinder switch (Fig. 2).

(4) Disengage the door lock cylinder switch from

the back of the lock cylinder.

(5) Unplug the door lock cylinder switch wire har-

ness connector.

(6) Disengage the retainers that secure the door

lock cylinder switch wire harness to the inner door
panel.

(7) Remove the door lock cylinder switch from the

door.

(8) Reverse the removal procedures to install.

LIFTGATE LOCK CYLINDER SWITCH

(1) Disconnect and isolate the battery negative

cable.

(2) Remove the trim panel from the liftgate inner

panel. Refer to Group 23 - Body for the procedures.

LIFTGATE LOCK CYLINDER SWITCH

Switch Position

Resistance

Neutral

12 Kilohms

Lock (Counter Clockwise)

644 Ohms

Unlock (Clockwise)

1565 Ohms

TERMINAL LEGEND

NUMBER

IDENTIFICATION

30

COMMON FEED

85

COIL GROUND

86

COIL BATTERY

87

NORMALLY OPEN

87A

NORMALLY CLOSED

Fig. 1 Relay Terminals

DN

VEHICLE THEFT/SECURITY SYSTEMS

8Q - 5

DIAGNOSIS AND TESTING (Continued)