Dodge Dakota (R1). Manual - part 286

CHIME/BUZZER

TABLE OF CONTENTS

page

CHIME WARNING SYSTEM

DESCRIPTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
OPERATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1

DIAGNOSIS AND TESTING . . . . . . . . . . . . . . . . . . 3

CHIME WARNING SYSTEM . . . . . . . . . . . . . . . . 3

CHIME WARNING SYSTEM

DESCRIPTION

A chime warning system is standard factory-in-

stalled equipment on this model. The chime warning
system uses a single chime tone generator that is
integral to the Central Timer Module (CTM) to pro-
vide an audible indication of various vehicle condi-
tions that may require the attention of the vehicle
operator. The chime warning system includes the fol-
lowing major components, which are described in fur-
ther detail elsewhere in this service manual:

• Central Timer Module - The Central Timer

Module (CTM) is located on the cowl side inner
panel, below the driver side end of the instrument
panel. The CTM contains an integral chime tone gen-
erator, integrated circuitry, a central processing unit,
and the programming to provide all of the proper
chime warning system features based upon the mon-
itored inputs. The CTM circuitry monitors hard
wired switch inputs as well as electronic messages
received from other electronic modules in the vehicle
over the Programmable Communications Interface
(PCI) data bus network.

• Door Ajar Switch - Door ajar switches are

integral to each door latch. These switches provide
inputs to the chime warning system indicating
whether a door is opened or closed.

• Headlamp Switch - The headlamp switch is

located on the instrument panel outboard of the
steering column. The headlamp switch provides input
to the chime warning system indicating whether any
interior or exterior lighting is turned On or Off.

• Ignition Switch - A key-in ignition switch is

integral to the ignition switch. The key-in ignition
switch provides an input to the chime warning sys-
tem indicating whether a key is present in the igni-
tion lock cylinder.

Hard wired circuitry connects many of the chime

warning system components to each other through
the electrical system of the vehicle. 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 con-

nected to each other, to the vehicle electrical system
and

the

chime

warning

system

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 information. The wir-
ing information includes wiring diagrams, proper
wire and connector repair procedures, further details
on wire harness routing and retention, as well as
pin-out and location views for the various wire har-
ness connectors, splices and grounds.

The CTM chime warning system circuitry and the

integral chime tone generator cannot be adjusted or
repaired. If the CTM or the chime tone generator are
damaged or faulty, the CTM unit must be replaced.

OPERATION

The chime warning system is designed to provide

an audible output as an indication of various condi-
tions that may require the attention or awareness of
the vehicle operator. The chime warning system com-
ponents operate on battery current received through
a fused B(+) fuse in the Junction Block (JB) on a
non-switched fused B(+) circuit so that the system
may operate regardless of the ignition switch posi-
tion.

The chime warning system provides an audible

indication to the vehicle operator under the following
conditions:

• Compass

Mini-Trip

Computer

(CMTC)

Reset - The Central Timer Module (CTM) chime tone
generator will generate one chime tone each time a
Programmable Communications Interface (PCI) data
bus message is received from the optional CMTC
indicating that the CMTC data has been reset.

• Door Ajar Warning - The CTM chime tone gen-

erator will generate repetitive chime tones at a slow
rate to announce that a hard wired input from any
door ajar switch indicates that a door is open with
the ignition switch in the On position. The chimes
will continue to sound until the all doors are closed
or the ignition switch is turned to the Off position,
whichever occurs first.

• Fasten Seat Belt Warning - The CTM chime

tone generator will generate repetitive chime tones at

CHIME/BUZZER

8B - 1

a slow rate to announce that a hard wired input from
the seat belt switch to the Electro-Mechanical Instru-
ment Cluster (EMIC) indicates that the driver side
front seat belt is not fastened with the ignition
switch in the On position. Unless the driver side
front seat belt is fastened the chimes will continue to
sound for a duration of about seven seconds each
time the ignition switch is turned to the On position,
or until the driver side front seat belt is fastened,
whichever occurs first. This chime tone is based upon
a PCI data bus chime request message input to the
CTM from the EMIC, but is not tied to the operation
of the EMIC “Seatbelt” indicator.

• Head/Park/Courtesy Lights-On Warning -

The CTM chime tone generator will generate repeti-
tive chime tones at a fast rate to announce that hard
wired inputs from the driver door ajar switch, head-
lamp switch, and ignition switch indicate that the
exterior or courtesy lamps are turned On with the
driver side front door opened and the ignition switch
in the Off position. The chimes will continue to sound
until the exterior or courtesy lamps are turned Off,
the driver side front door is closed, or the ignition
switch is turned to the On position, whichever occurs
first.

• Key-In-Ignition Warning - The CTM chime

tone generator will generate repetitive chime tones at
a fast rate to announce that hard wired inputs from
the driver door ajar switch, headlamp switch, and
ignition switch indicate that the key is in the ignition
lock cylinder with the driver side front door opened
and the ignition switch in the Off position. The
chimes will continue to sound until the key is
removed from the ignition lock cylinder, the driver
side front door is closed, or the ignition switch is
turned to the On position, whichever occurs first.

• Overspeed Warning - The CTM chime tone

generator will generate repetitive chime tones at a
slow rate to announce that a PCI data bus vehicle
speed message from the Powertrain Control Module
(PCM) indicates that the vehicle speed is over a pro-
grammed speed value. This feature is only enabled
on a CTM that has been programmed with a Middle
East Gulf Coast Country (GCC) country code.

• Warning Chime Support - The CTM chime

tone generator will generate repetitive chime tones at
a slow rate to announce that a PCI data bus chime
request message input has been received from the
EMIC or the Airbag Control Module (ACM). These
chime tones provide an audible alert to the vehicle
operator that supplements certain visual indications
displayed by the EMIC. Supplemented indications
include the following:

• The “Airbag” indicator is illuminated. The ACM

sends a chime request to the CTM at the same time
it sends an airbag lamp-on request to the EMIC. The

chimes will continue to sound for a duration of about
four seconds each time the indicator is illuminated or
until the ignition switch is turned to the Off position,
whichever occurs first.

• The “Check Gages” indicator is illuminated. The

EMIC sends a chime request to the CTM. The chimes
will continue to sound for a duration of about two
seconds each time the indicator is illuminated or
until the ignition switch is turned to the Off position,
whichever occurs first.

• The “Low Coolant” indicator is illuminated (die-

sel engine only). The EMIC sends a chime request to
the CTM. The chimes will continue to sound for a
duration of about two seconds each time the indicator
is illuminated or until the ignition switch is turned
to the Off position, whichever occurs first.

• The “Low Fuel” indicator is illuminated. The

• The “Low Wash” indicator is illuminated. The

• The “Trans Temp” indicator is illuminated (auto-

matic transmission only). The EMIC sends a chime
request to the CTM. The chimes will continue to
sound for a duration of about two seconds each time
the indicator is illuminated or until the ignition
switch is turned to the Off position, whichever occurs
first.

• A turn signal indicator is illuminated after the

vehicle has surpassed a programmed speed and dis-
tance. The EMIC sends a chime request to the CTM.
The chimes will continue to sound until the turn sig-
nal is turned Off, or until the vehicle speed is
reduced below the programmed level, whichever
occurs first.

• The “Water-In-Fuel” indicator is illuminated

(diesel engine only). The EMIC sends a chime
request to the CTM. The chimes will continue to
sound for a duration of about two seconds each time
the indicator is illuminated or until the ignition
switch is turned to the Off position, whichever occurs
first.

The CTM provides chime service for all available

features in the chime warning system. The CTM
relies upon its internal programming and hard wired
inputs from the door ajar switches, the headlamp
switch, and the key-in ignition switch (ignition
switch) to provide chime service for the head/park/
courtesy

lights-on

reminder,

the

key-in

ignition

8B - 2

CHIME/BUZZER

CHIME WARNING SYSTEM (Continued)

reminder, and the door ajar warning. The CTM relies
upon electronic message inputs received from other
electronic modules over the PCI data bus network to
provide chime service for all of the remaining chime
warning system features. Upon receiving the proper
inputs, the CTM activates the integral chime tone
generator to provide the audible chime tone to the
vehicle operator. The chime tone generator in the
CTM is capable of producing a single short beep and
repeated chime tones at two different rates, slow or
fast. The slow chime rate is about fifty chime tones
per minute, while the fast chime rate is about 180
chime tones per minute. The internal programming
of the CTM determines the priority of each chime
tone request input that is received, as well as the
rate and duration of each chime tone that is to be
generated.

The hard wired chime warning system inputs to

the CTM, as well as other hard wired circuits for this
system may be diagnosed and tested using conven-
tional diagnostic tools and procedures. See the own-
er’s manual in the vehicle glove box for more
information on the features provided by the chime
warning system.

DIAGNOSIS AND TESTING - CHIME WARNING
SYSTEM

Refer to the appropriate wiring information. The

wiring information includes wiring diagrams, proper

wire and connector repair procedures, further details
on wire harness routing and retention, as well as
pin-out and location views for the various wire har-
ness connectors, splices and grounds. The hard wired
chime warning system inputs to the Central Timer
Module (CTM), as well as other hard wired circuits
for this system may be diagnosed and tested using
conventional diagnostic tools and procedures.

WARNING: ON VEHICLES EQUIPPED WITH AIR-
BAGS, DISABLE THE AIRBAG SYSTEM BEFORE
ATTEMPTING ANY STEERING WHEEL, STEERING
COLUMN, OR INSTRUMENT PANEL COMPONENT
DIAGNOSIS OR SERVICE. DISCONNECT AND ISO-
LATE THE BATTERY NEGATIVE (GROUND) CABLE,
THEN WAIT TWO MINUTES FOR THE AIRBAG SYS-
TEM CAPACITOR TO DISCHARGE BEFORE PER-
FORMING FURTHER DIAGNOSIS OR SERVICE. THIS
IS THE ONLY SURE WAY TO DISABLE THE AIRBAG
SYSTEM. FAILURE TO TAKE THE PROPER PRE-
CAUTIONS COULD RESULT IN ACCIDENTAL AIR-
BAG DEPLOYMENT AND POSSIBLE PERSONAL
INJURY.

CHIME WARNING SYSTEM DIAGNOSIS

CONDITION

POSSIBLE CAUSES

CORRECTION

DOOR AJAR WARNING
CHIME WITH DOORS
CLOSED

1. Driver or passenger door
ajar switch sense circuit
shorted.

1. Disconnect the door wire harness connector for
the driver door ajar switch or the passenger door
ajar switch (1 switch - standard/club cab, 3
switches - quad cab) and the body wire harness
connector (Connector C2) for the CTM. Check for
continuity between the driver or passenger door
ajar switch sense circuit cavity and a good
ground. There should be no continuity. Repair the
shorted driver or passenger door ajar switch
sense circuit, if required.

2. Faulty driver or passenger
door ajar switch.

2. Check for continuity between the ground circuit
cavity and the driver or passenger door ajar
switch sense circuit cavity of the door ajar switch
pigtail wire connector. There should be no
continuity with the door closed. Replace the faulty
door latch, if required.

CHIME/BUZZER

8B - 3

CHIME WARNING SYSTEM (Continued)

Content .. 284 285 286 287 ..