chrysler dakota part13

7/28/2019 chrysler dakota part13

1/6

HORN

CONTENTS

page page

DIAGNOSIS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2

GENERAL INFORMATION . . . . . . . . . . . . . . . . . . 1

SERVICE PROCEDURES . . . . . . . . . . . . . . . . . . . 3

GENERAL INFORMATION

Following are general descriptions of the majorcomponents in the Dakota horn system. Refer toGroup 8W - Wiri ng Diagrams for complete circuit de-scriptions and diagrams.

HORN SWITCH

Two horn switches are installed in the steeringwheel, one on each side of the center-mounted driv-ers airbag module. When either switch is depressedit completes a circuit to ground for the coil side of thehorn relay. The steering wheel and steering columnmust be properly grounded for the horn switches tofunction. The horn switches are only serviced as a setwith their wiring. I f either switch should fail, bothswitches must be replaced.

HORN RELAY

The horn relay is installed in the fuseblock moduleunder the instrument panel and left of the steering

column. One side of the horn relay electromagnetic

coil receives battery voltage at all times. When a

horn switch is depressed, the other side of the relay

coil is grounded. The energized relay coil causes the

normally open relay contacts to close, providing bat-

tery voltage to the horn.

I f a problem is encountered with a continuouslysounding horn, it can usually be quickly resolved by

removing the horn relay from the fuseblock module

until further diagnosis is completed.

HORN

The single, lo-note, diaphragm-type horn is located

in the engine compartment on the upper left corner

of the radiator closure panel just forward of the bat-

tery. I t is grounded to the closure panel and receives

battery feed through the closed contacts of the horn

relay.

HORN 8G - 1


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DIAGNOSIS

WARNING: ON VEHICLES EQUIPPED WITH AN AIR-

BAG, REFER TO GROUP 8M - RESTRAINT SYS-

TEMS BEFORE ATTEMPTING STEERING WHEEL

COMPONENT DIAGNOSIS OR SERVICE. FAILURE

TO TAKE PROPER PRECAUTIONS COULD RESULT

IN ACCIDENTAL AIRBAG DEPLOYMENT AND POS-

SIBLE PERSONAL INJURY.

HORN RELAY

RELAY TESTS

(1) Remove horn relay from fuseblock module. Thede-energized relay should have continuity betweenterminals 1 and 3 (Fig. 1). There should be no conti-nuity between terminals 2 and 3. If OK, go to nextstep. I f not OK , replace faulty relay.

(2) Connect relay terminal 1 to a good ground andterminal 3 to a battery feed. There should now bebattery voltage at terminal 2. I f OK, go to CircuitTest. I f not OK, replace faulty relay.

RELAY CIRCUIT TESTS

(1) Remove relay from fuseblock module. Check forbattery voltage at horn relay cavity 3 in fuseblockmodule (Fig. 1). If OK, go to step 3. If not OK, go to

next step.(2) Check fuse 6 in fuseblock module. I f OK , repairopen circuit to horn relay cavity 3. I f not OK , replacefuse.

(3) Check for continuity between horn relay cavity1 and a good ground. There should be no continuity.

Still probing horn relay cavity 1, depress either hornswitch, there should now be continuity to ground. I fOK, go to next step. I f not OK , see diagnosis for hornswitch.

(4) Unplug connector at horn. Check for continui ty

between horn relay cavity 2 and a good ground.There should be no continuity. I f OK , go to next step.If not OK, repair short circuit as required.

(5) Check for continui ty between horn relay cavity2 and horn connector. There should be continui ty. I fOK, see diagnosis for horn. I f not OK , repair opencircuit as required.

HORN SWITCH

(1) Disconnect battery negative cable. Removeknee blocker. Check for continuity between metalsteering column jacket and a good ground. Thereshould be continuity. I f OK, go to next step. I f not

OK , refer to Group 19 - Steering and check for properinstallation of steering column ground clip.

(2) Remove horn relay from fuseblock module. Ac-cess horn switch wire connector as described in HornSwitch Remove/Install. Unplug horn wire connector.Check for continuity between steering column half ofhorn wire connector and a good ground. T here shouldbe no continuity. I f OK, go to next step. I f not OK,repair short circuit as r equired.

(3) Check for continuity between steering columnhalf of horn wire connector and horn relay cavity 1.There should be continuity. I f OK, go to next step. I fnot OK , repair open circuit as required.

(4) Check for continuity between horn switch halfof horn wire connector and a good ground. Thereshould be no continuity. I f OK , go to next step. I f notOK , replace faulty horn switches.

(5) Depress one horn switch and check for continu-ity between horn switch half of horn wire connectorand a good ground. There should be continuity. Re-peat test for other horn switch. I f either switch i s notOK , replace faulty horn switches.

HORN

(1) Measure resistance between the horn mounting

bracket and a good ground. There should be zeroohms. I f not OK , r epair horn ground.(2) Disconnect horn connector. Depress horn

switch. There should be battery voltage at the hornconnector. I f OK , replace horn. I f not OK , r epair opencircuit to horn relay.

Fig. 1 Horn Relay Connections

8G - 2 HORN


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SERVICE PROCEDURES

HORN SWITCH REMOVE/INSTALL

WARNING: BEFORE BEGINNING ANY AIRBAG SYSTEM

COMPONENT REMOVAL OR INSTALLATION, REMOVE

AND ISOLATE THE NEGATIVE (-) CABLE FROM THE BAT-

TERY. THIS IS THE ONLY SURE WAY TO DISABLE THEAIRBAG SYSTEM. FAILURE TO DO THIS COULD RESULT

IN ACCIDENTAL AIRBAG DEPLOYMENT AND POSSIBLE

INJURY. WAIT 2 MINUTES FOR THE RESERVE CAPACI-

TOR TO DISCHARGE BEFORE REMOVING OR WORKING

ON ANY AIRBAG SYSTEM COMPONENTS.

(1) Disconnect negative cable from battery.

(2) From underside of steering wheel, remove speed

control switch or trim bar mounting screws (Fig. 2).

(3) Pull switch/trim bar from wheel and unplug

connector (Fig. 3).

(4) Using a small screwdriver remove right rearsteeri ng wheel cover (Fig. 4).

(5) Remove 4 nuts attaching airbag module (Fig.5).

(6) Remove air bag module from steering wheel.

(7) U sing a small screwdriver pry horn button

from steering wheel (Fig. 6). There are 2 locking tabs

holding each horn button to steering wheel (Fig. 7).

(8) Unplug electrical connectors and remove horn

buttons from steering wheel (Fig. 8).

Fig. 2 Speed Control Switch/Trim Bar Remove/Install

Fig. 3 Speed Control Switch Connector Remove/Install

Fig. 4 Right Rear Steering Wheel Cover Remove/

Install

Fig. 5 Airbag Module Remove/Install

HORN 8G - 3


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(9) Reverse r emoval procedures to install. Ti ghten

airbag module mounting nuts to 1.5 Nm (15 in. lbs.)

torque.

HORN REMOVE/INSTALL

(1) Raise and support the hood.

(2) Make sure ignition switch is in OFF position

and all battery feed accessories are OF F.

(3) Disconnect and remove battery cables at bat-

tery, negative cable first.

WARNING: WEAR A SUITABLE PAIR OF RUBBER

GLOVES (NOT THE HOUSEHOLD TYPE) WHEN RE-

MOVING A BATTERY BY HAND. SAFETY GLASSES

SHOULD ALSO BE WORN. IF THE BATTERY IS

CRACKED OR LEAKING THE ELECTROLYTE CAN

BURN THE SKIN AND EYES.

(4) Remove battery holddown (Fi g. 9) and remove

battery from vehicle.

Fig. 6 Horn Button Remove

Fig. 7 Horn Button Locking Tabs

Fig. 8 Horn Button Connectors

Fig. 9 Battery Holddown Remove/Install

8G - 4 HORN


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CAUTION: The horn connector is a self locking con-

nector. To remove it, grasp and pull the insulator

only. DO NOT pull on the wire.

(5) Remove the wire connector from the horn (Fi g.

10).

(6) From the front of the vehicle remove the hornmounting bolt while removing the horn (Fig. 11).

(7) Reverse r emoval procedures to install. Tightenthe horn mounting bolt to 22.6 Nm (200 in. lbs.), andthe battery holddown bolts to 2.2 Nm (20 in. lbs.)torque.

Fig. 10 Horn Remove/Install

Fig. 11 Horn Bracket Mounting Bolt Remove/Install

HORN 8G - 5


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chrysler dakota part13