Service Manuals, User Guides, Schematic Diagrams or docs for : . Car Manuals Dodge Durango 1998-2000 Approved Dodge Durango 1998-99 98DN_8G
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DN HORN SYSTEMS 8G - 1
HORN SYSTEMS
CONTENTS
page page
GENERAL INFORMATION DIAGNOSIS AND TESTING
HORN SYSTEM . . . . . . . . . . . . . . . . . . . . . . . . . . 1 HORN . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
INTRODUCTION . . . . . . . . . . . . . . . . . . . . . . . . . 1 HORN RELAY . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
DESCRIPTION AND OPERATION HORN SWITCH . . . . . . . . . . . . . . . . . . . . . . . . . . 3
CENTRAL TIMER MODULE . . . . . . . . . . . . . . . . 2 REMOVAL AND INSTALLATION
HORN . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 HORN . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
HORN RELAY . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 HORN RELAY . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
HORN SWITCH . . . . . . . . . . . . . . . . . . . . . . . . . . 1 HORN SWITCH . . . . . . . . . . . . . . . . . . . . . . . . . . 4
GENERAL INFORMATION switch grounds the relay coil. See Horn Relay in the
Diagnosis and Testing section of this group for more
INTRODUCTION information.
An electric horn system is standard factory-in- The horn relay is located in the Power Distribution
stalled equipment on this model. Refer to 8W-41 - Center (PDC), in the engine compartment. Refer to
Horns/Cigar Lighter in Group 8W - Wiring Diagrams the PDC label for relay identification and location.
for complete circuit descriptions and diagrams. If a problem is encountered with a continuously
sounding horn, it can usually be quickly resolved by
HORN SYSTEM removing the horn relay from the PDC until further
Two horn systems are offered on this model. The diagnosis is completed.
standard equipment horn system features a single The horn relay cannot be repaired and, if faulty or
low-note electromagnetic horn unit, while the damaged, it must be replaced.
optional dual horn system features one low-note unit
and one high-note unit. HORN SWITCH
Each horn system is activated by a switch con- A center-blow, resistive membrane-type horn
cealed beneath the driver side airbag module trim switch is installed on the back side of the driver side
cover in the center of the steering wheel. The horn airbag module trim cover in the center of the steer-
system is connected to a non-switched battery feed so ing wheel. When the center area of the airbag trim
that the system remains functional, regardless of the cover is depressed, the horn switch completes a cir-
ignition switch position. cuit to ground for the coil side of the horn relay. The
Following are general descriptions of the major steering wheel and steering column must be properly
components in the horn system. Refer to the owner's grounded for the horn switch to function.
manual in the vehicle glove box for more information The horn switch is only serviced as a part of the
on the features, use and operation of the horn sys- airbag module trim cover. If the horn switch should
tem. fail, or if the airbag is deployed, the airbag module
trim cover and horn switch must be replaced as a
unit.
DESCRIPTION AND OPERATION
HORN
HORN RELAY The standard single, low-note, electromagnetic dia-
The horn relay is a International Standards Orga- phragm-type horn is secured with a bracket to the
nization (ISO) micro-relay. The terminal designations right front inner fender shield in the engine compart-
and functions are the same as a conventional ISO ment. The high-note horn for the optional dual-note
relay. However, the micro-relay terminal orientation horn system is connected in parallel with and
(or footprint) is different, current capacity is lower, secured with a bracket just forward of the low-note
and the relay case dimensions are smaller than those horn. Each horn is grounded through its wire har-
of the conventional ISO relay. ness connector and circuit to an eyelet on the right
The horn relay is a electromechanical device that
switches battery current to the horn when the horn
8G - 2 HORN SYSTEMS DN
DESCRIPTION AND OPERATION (Continued)
inner fender shield, and receives battery feed DIAGNOSIS AND TESTING
through the closed contacts of the horn relay.
The horns cannot be repaired or adjusted and, if HORN RELAY
faulty or damaged, they must be individually For circuit descriptions and diagrams, refer to
replaced. 8W-41 - Horns/Cigar Lighter in Group 8W - Wiring
Diagrams.
CENTRAL TIMER MODULE
Two versions of the Central Timer Module (CTM) WARNING: ON VEHICLES EQUIPPED WITH AIR-
are available on this vehicle, a base version and a BAGS, REFER TO GROUP 8M - PASSIVE
high-line version. The base version of the CTM is RESTRAINT SYSTEMS BEFORE ATTEMPTING ANY
used on base models of the vehicle. The base version STEERING WHEEL, STEERING COLUMN, OR
of the CTM combines the functions of a chime/buzzer INSTRUMENT PANEL COMPONENT DIAGNOSIS OR
module, an intermittent wipe module, an illuminated SERVICE. FAILURE TO TAKE THE PROPER PRE-
entry module and an ignition lamp time delay relay CAUTIONS COULD RESULT IN ACCIDENTAL AIR-
in a single unit. BAG DEPLOYMENT AND POSSIBLE PERSONAL
The high-line version of the CTM is used on high- INJURY.
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- RELAY TEST
tronic functions and features included on the high- The horn relay (Fig. 1) is located in the Power Dis-
line models. The high-line version of the CTM tribution Center (PDC) in the engine compartment.
contains a central processing unit and interfaces with Refer to the PDC label for horn relay identification
other modules in the vehicle on the Chrysler Colli- and location.
sion Detection (CCD) data bus network. Remove the horn relay from the PDC as described
The CCD data bus network allows the sharing of in this group to perform the following tests:
sensor information. This helps to reduce wire har- (1) A relay in the de-energized position should
ness complexity, reduce internal controller hardware, have continuity between terminals 87A and 30, and
and reduce component sensor current loads. At the no continuity between terminals 87 and 30. If OK, go
same time, this system provides increased reliability, to Step 2. If not OK, replace the faulty relay.
enhanced diagnostics, and allows the addition of (2) Resistance between terminals 85 and 86 (elec-
many new feature capabilities. tromagnet) should be 75 5 ohms. If OK, go to Step
The horn relay is one of the outputs that the high- 3. If not OK, replace the faulty relay.
line CTM can control. The high-line CTM is pro- (3) Connect a battery to terminals 85 and 86.
grammed to energize or de-energize the horn relay in There should now be continuity between terminals
response to certain inputs from the Vehicle Theft 30 and 87, and no continuity between terminals 87A
Security System (VTSS) and the Remote Keyless and 30. If OK, see Relay Circuit Test in the Diagno-
Entry (RKE) system. Refer to Group 8P - Power Lock sis and Testing section of this group. If not OK,
Systems for more information on the RKE system. replace the faulty relay.
Refer to Group 8Q - Vehicle Theft/Security Systems
for more information on 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-
tion section of Group 8E - Instrument Panel Systems
for the service procedures.
Refer to Central Timer Module in the Diagnosis
and Testing section of Group 8U - Chime/Buzzer
Warning Systems for diagnosis of the base version of
the CTM. For diagnosis of the high-line version of
the CTM or 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.
Fig. 1 Horn Relay
DN HORN SYSTEMS 8G - 3
DIAGNOSIS AND TESTING (Continued)
RELAY CIRCUIT TEST proper installation of the steering column mounting
(1) The relay common feed terminal cavity (30) is hardware.
connected to battery voltage and should be hot at all (3) Remove the driver side airbag module from the
times. If OK, go to Step 2. If not OK, repair the open steering wheel. Refer to Airbag Module in the
circuit to the PDC fuse as required. Removal and Installation section of Group 8M - Pas-
(2) The relay normally closed terminal (87A) is sive Restraint Systems for the procedures. Unplug
connected to terminal 30 in the de-energized position, the horn switch wire harness connectors from the
but is not used for this application. Go to Step 3. airbag module.
(3) The relay normally open terminal (87) is con- (4) Unplug the horn relay from the Power Distri-
nected to the common feed terminal (30) in the ener- bution Center (PDC). Check for continuity between
gized position. This terminal supplies battery voltage the steering column half of the horn switch feed wire
to the horn(s). There should be continuity between harness connector and a good ground. There should
the cavity for relay terminal 87 and the horn relay be no continuity. If OK, go to Step 5. If not OK,
output circuit cavity of each horn wire harness con- repair the short circuit as required.
nector at all times. If OK, go to Step 4. If not OK, (5) Check for continuity between the steering col-
repair the open circuit to the horn(s) as required. umn half of the horn switch feed wire harness con-
(4) The coil battery terminal (86) is connected to nector and the horn relay control circuit cavity for
the electromagnet in the relay. It is connected to bat- the horn relay in the PDC. There should be continu-
tery voltage and should be hot at all times. Check for ity. If OK, go to Step 6. If not OK, repair the open
battery voltage at the cavity for relay terminal 86. If circuit as required.
OK, go to Step 5. If not OK, repair the open circuit to (6) Check for continuity between the horn switch
the fuse in the PDC as required. feed wire and the horn switch ground wire on the
(5) The coil ground terminal (85) is connected to airbag module. There should be no continuity. If OK,
the electromagnet in the relay. It is grounded go to Step 7. If not OK, replace the faulty horn
through the horn switch when the horn switch is switch.
depressed. It can also be grounded by the high-line (7) Depress the center of the airbag module trim
Central Timer Module (CTM) in response to inputs cover and check for continuity between the horn
from the Vehicle Theft Security System (VTSS) or the switch feed wire and the horn switch ground wire on
Remote Keyless Entry (RKE) system. Check for con- the airbag module. There should now be continuity. If
tinuity to ground at the cavity for relay terminal 85. not OK, replace the faulty horn switch.
There should be continuity with the horn switch
depressed, and no continuity with the horn switch HORN
released. If not OK, see Horn Switch in the Diagnosis For circuit descriptions and diagrams, refer to
and Testing section of this group. 8W-41 - Horns/Cigar Lighter in Group 8W - Wiring
Diagrams.
HORN SWITCH (1) Measure the resistance between the horn
For circuit descriptions and diagrams, refer to mounting bracket and a good ground. There should
8W-41 - Horns/Cigar Lighter in Group 8W - Wiring be no measurable resistance. If OK, go to Step 2. If
Diagrams. not OK, repair the horn ground connection as
required.
WARNING: ON VEHICLES EQUIPPED WITH AIR- (2) Unplug the horn wire harness connector.
BAGS, REFER TO GROUP 8M - PASSIVE Depress the horn switch. There should be battery
RESTRAINT SYSTEMS BEFORE ATTEMPTING ANY voltage at the horn relay output circuit cavity of horn
STEERING WHEEL, STEERING COLUMN, OR wire harness connector. If OK, replace the faulty
INSTRUMENT PANEL COMPONENT DIAGNOSIS OR horn(s). If not OK, repair the open circuit to the horn
SERVICE. FAILURE TO TAKE THE PROPER PRE- relay as required.
CAUTIONS COULD RESULT IN ACCIDENTAL AIR-
BAG DEPLOYMENT AND POSSIBLE PERSONAL
INJURY. REMOVAL AND INSTALLATION
(1) Disconnect and isolate the battery negative HORN RELAY
cable. Remove the steering column opening cover and (1) Disconnect and isolate the battery negative
knee blocker from the instrument panel. cable.
(2) Check for continuity between the metal steer- (2) Remove the cover from the Power Distribution
ing column jacket and a good ground. There should Center (PDC) (Fig. 2).
be continuity. If OK, go to Step 3. If not OK, refer to (3) Refer to the label on the PDC for horn relay
Steering Column in Group 19 - Steering for the identification and location.
8G - 4 HORN SYSTEMS DN
REMOVAL AND INSTALLATION (Continued)
GROUP 8M - PASSIVE RESTRAINT SYSTEMS FOR
THE SERVICE PROCEDURES.
HORN
(1) Disconnect and isolate the battery negative
cable.
(2) Unplug the wire harness connector from the
horn (Fig. 3).
Fig. 2 Power Distribution Center
(4) Unplug the horn relay from the PDC.
(5) Install the horn relay by aligning the relay ter-
minals with the cavities in the PDC and pushing the
relay firmly into place.
(6) Install the PDC cover.
(7) Connect the battery negative cable.
(8) Test the relay operation.
HORN SWITCH
WARNING: ON VEHICLES EQUIPPED WITH A
DRIVER SIDE AIRBAG, THE HORN SWITCH IS INTE-
GRAL TO THE AIRBAG MODULE TRIM COVER.
SERVICE OF THIS COMPONENT SHOULD BE PER-
FORMED ONLY BY CHRYSLER-TRAINED AND Fig. 3 Horns Remove/Install
AUTHORIZED DEALER SERVICE TECHNICIANS. (3) Remove the screw that secures the horn
FAILURE TO TAKE THE PROPER PRECAUTIONS mounting bracket to the inner fender shield.
OR TO FOLLOW THE PROPER PROCEDURES (4) Remove the horn and mounting bracket from
COULD RESULT IN ACCIDENTAL, INCOMPLETE, OR the inner fender shield.
IMPROPER AIRBAG DEPLOYMENT AND POSSIBLE (5) Reverse the removal procedures to install.
PERSONAL INJURY. REFER TO DRIVER SIDE AIR- Tighten the mounting screw to 11 N◦ Jabse Service Manual Search 2026 ◦ Jabse Pravopis ◦ onTap.bg ◦ Other service manual resources online : Fixya ◦ eServiceinfo