Dodge Dakota (R1). Manual - part 339

equipment on this model. The power lock system is
offered only on models that are also equipped with
power windows. On vehicles equipped with power
locks, the power lock motors are controlled by a
microprocessor-based Central Timer Module (CTM).
The CTM is used to provide many electronic features
and conveniences that are not possible with a con-
ventional hard wired power lock system. The CTM
microprocessor is able to control power lock system
operation based upon the CTM programming and

electronic message inputs received from other elec-
tronic modules in the vehicle over the Programmable
Communications Interface (PCI) data bus network,
Radio Frequency (RF) inputs received from the
optional Remote Keyless Entry (RKE) system trans-
mitters, as well as many hard wired inputs.

The power lock system includes the following

major components, which are described in further
detail elsewhere in this service manual:

• Central Timer Module - The Central Timer

Module (CTM) is located on the left cowl side inner
panel under the driver side outboard end of the
instrument panel. The CTM contains a microproces-
sor and software that allow it to provide the many

POWER SYSTEMS

8N - 1

electronic functions and features not available with
conventional hard wired power lock systems.

• Driver Door Module - A power lock switch is

integral to the driver door module unit located near
the forward end of the arm rest on the driver side
front door trim panel and allows the power lock sys-
tem to be operated by the driver.

• Power Lock Motors - A reversible electric

motor integral to the door latch of each door locks or
unlocks the latches when provided with the appropri-
ate electrical inputs.

• Power Lock Switch - An individual power lock

switch is secured to a switch bezel near the forward
end of the arm rest on the passenger side front door
trim panel and allows the power lock system to be
operated by the front seat passenger.

On those models equipped with the optional Vehi-

cle Theft Security System (VTSS), the power lock
system also includes the following components, which
are described in further detail elsewhere in this ser-
vice manual:

• Door Cylinder Lock Switches - A resistor-

multiplexed switch located on the back of each front
door lock cylinder allows the power door lock system
to be operated using a key inserted in either the
driver or passenger front door lock cylinder.

Some of the additional features of the power lock

system in this model include:

• Automatic Door Lock - The CTM provides an

optional automatic door lock feature (also known as
rolling door locks). This is a programmable feature.

• Central Locking - On models also equipped

with the optional VTSS (includes door cylinder lock
switches), the CTM provides an optional central lock-
ing/unlocking feature.

• Door Lock Inhibit - The CTM provides a door

lock inhibit feature.

• Enhanced Accident Response - The CTM pro-

vides an optional enhanced accident response fea-
ture. This is a programmable feature.

Hard wired circuitry connects the power lock sys-

tem components to the electrical system of the vehi-
cle. These hard wired circuits are integral to several
wire harnesses, which are routed throughout the
vehicle and retained by many different methods.
These circuits may be connected to each other, to the
vehicle electrical system and to the power lock sys-
tem components through the use of a combination of
soldered splices, splice block connectors, and many
different types of wire harness terminal connectors
and insulators. Refer to the appropriate wiring infor-
mation. The wiring information includes wiring dia-
grams, proper wire and connector repair procedures,
further details on wire harness routing and reten-
tion, as well as pin-out and location views for the
various wire harness connectors, splices and grounds.

Many of the electronic features in the vehicle con-

trolled or supported by the CTM are programmable
using the DRBIII

t scan tool. In addition, the CTM

software is Flash compatible, which means it can be
reprogrammed using Flash reprogramming proce-
dures. However, if any of the CTM hardware compo-
nents are damaged or faulty, the entire CTM unit
must be replaced. The power lock system components
and the hard wired inputs or outputs of the CTM can
be diagnosed using conventional diagnostic tools and
methods; however, for diagnosis of the CTM or the
PCI data bus, the use of a DRBIII

t scan tool is

required. Refer to the appropriate diagnostic infor-
mation.

DESCRIPTION - REMOTE KEYLESS ENTRY
SYSTEM

A Remote Keyless Entry (RKE) system is an avail-

able option on this model when it is equipped with
the optional power lock system. The RKE system is a
Radio Frequency (RF) system that allows the remote
operation of the power lock system and, if the vehicle
is so equipped, the Vehicle Theft Security System
(VTSS).

(Refer

ELECTRICAL/VEHICLE

THEFT SECURITY - DESCRIPTION). The RKE sys-
tem includes the following major components, which
are described in further detail elsewhere in this ser-
vice manual:

• Central Timer Module - The Central Timer

Module (CTM) is located on the left cowl side inner
panel under the driver side outboard end of the
instrument panel. The CTM contains a microproces-
sor, an RF receiver, and the software that allow it to
provide the many electronic functions and features of
the RKE system.

• Keyless Entry Transmitter - The keyless

entry transmitter is a small, battery-powered, RF
transmitter that is contained within a molded plastic
case that is designed to also serve as a convenient
key fob.

Some additional features of the RKE system

include:

• Driver Door Unlock Only - This is a program-

mable feature on quad cab models only, which allows
the option of having a single press of the RKE trans-
mitter Unlock button unlock only the driver door, or
all doors. If the driver door only option is selected, a
second press of the Unlock button will unlock the
remaining doors.

• Horn Chirp - This feature provides a short,

sharp chirp of the vehicle horn to give an audible
confirmation that a valid Lock signal has been
received from the RKE transmitter. This feature can
be enabled or disabled and, if enabled, one of two
optional horn chirp durations (twenty or forty milli-
seconds) can also be selected.

8N - 2

POWER LOCKS

POWER LOCKS (Continued)

• Illuminated Entry - This feature turns on the

courtesy lamps in the vehicle for a timed interval
(about thirty seconds) each time a valid Unlock sig-
nal has been received from the RKE transmitter.

• Optical Chirp - This feature provides a flash of

the vehicle park lamps to give an optical confirma-
tion that a valid Lock or Unlock signal has been
received from the RKE transmitter. The lamps flash
once for a Lock signal, and twice for an Unlock sig-
nal. This feature can be enabled or disabled.

• Panic Mode - This feature allows the vehicle

operator to cause the vehicle horn to pulse and head-
lights to flash for about three minutes, and the cour-
tesy lamps to illuminate for about thirty seconds by
depressing a Panic button on the RKE transmitter.
Pressing the Panic button a second time will cancel
the Panic mode. A vehicle speed of about 24 kilome-
ters-per-hour (15 miles-per-hour) will also cancel the
panic mode.

OPERATION - POWER LOCK SYSTEM

The power lock system allows all doors to be locked

or unlocked electrically by operating the power lock
switch on either front door trim panel. On vehicles
that are also equipped with the optional Remote Key-
less Entry (RKE) system the power locks can also be
operated using the RKE transmitter, and on vehicles
that are equipped with the optional Vehicle Theft
Security System (VTSS) the power locks can also be
operated using a key in either front door or the lift-
gate lock cylinder. If certain features of the power
lock system have been electronically enabled, the
power locks may also be operated automatically by
the Central Timer Module (CTM) based upon various
other inputs. Those features and their inputs are:

• Automatic Door Lock - If enabled, the CTM

will automatically lock the doors when it receives a
message from the Powertrain Control Module (PCM)
indicating that the vehicle speed is about 24 kilome-
ters-per-hour (15 miles-per-hour) or greater. The
CTM also monitors the door ajar switches, and will
not activate the automatic door lock feature until all
doors have been closed for at least five seconds. If
this feature is enabled and a door is opened after the
vehicle is moving at 24 kilometers-per-hour (15
miles-per-hour) or greater, the CTM will lock the
doors again five seconds after all doors are again
closed.

• Central Locking - Vehicles equipped with the

optional VTSS also have a resistor-multiplexed door
cylinder lock switch mounted to the back of the lock
cylinder within each front door. The CTM continually
monitors the input from these switches to provide the
central locking/unlocking feature. The CTM will
automatically lock or unlock all doors when either
front door is locked or unlocked using a key.

• Door Lock Inhibit - The CTM receives inputs

from the key-in ignition switch, the headlamp switch,
and the door ajar switches. The logic within the CTM
allows it to monitor these inputs to provide a door
lock inhibit feature. The door lock inhibit feature pre-
vents the power lock system from being energized
with a power lock switch input if the driver door is
open with the headlamps on or the key still in the
ignition switch. However, the locks can still be oper-
ated with the manual door lock button or with a key
in the door lock cylinder, and the power locks will
still operate using the RKE transmitter while the
driver door is open with the headlamps on or a key
in the ignition.

• Enhanced Accident Response - If enabled,

the CTM provides an enhanced accident response
feature. This feature uses electronic message inputs
received by the CTM from the Airbag Control Module
(ACM) to determine when an airbag has been
deployed. The CTM also monitors the state of the
power lock system and the vehicle speed messages
from the PCM in order to provide this feature. If an
airbag has been deployed and the vehicle has stopped
moving, the CTM will automatically unlock the
doors, prevent the doors from being locked, and turn
on the courtesy lamps inside the vehicle. Of course,
these responses are dependent upon a functional bat-
tery and electrical circuitry following the impact.

The power lock system operates on battery current

received through a fused B(+) circuit from a fuse in
the Junction Block (JB) so that the system remains

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