SWB a6 m18b Final

7/29/2019 SWB a6 m18b Final

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ASE 6 - Electrical

Module 18B

Horn Systems


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Acknowledgements

General Motors, the IAGMASEP Association Board of Directors, and Raytheon Professional

Services, GM's training partner for GM's Service Technical College wish to thank all of the people

who contributed to the GM ASEP/BSEP curriculum development project 2002-3. This project

would not have been possible without the tireless efforts of many people. We acknowledge:

The IAGMASEP Association members for agreeing to tackle this large project to create

the curriculum for the GM ASEP/BSEP schools.

The IAGMASEP Curriculum team for leading the members to a single vision and

implementation.

Direct contributors within Raytheon Professional Services for their support of translating a

good idea into reality. Specifically, we thank:

Chris Mason and Vince Williams, for their leadership, guidance, and support. Media and Graphics department under Mary McClain and in particular, Cheryl

Squicciarini, Diana Pajewski, Lesley McCowey, Jeremy Pawelek, & Nancy DeSantis.

For his help on the Electrical curriculum volume, Subject Matter Expert, Ken Beish, Jr.,

for his wealth of knowledge.

Finally, we wish to recognize the individual instructors and staffs of the GM ASEP/BSEP Colleges

for their contribution for reformatting existing General Motors training material, adding critical

technical content and the sharing of their expertise in the GM product. Separate committeesworked on each of the eight curriculum areas. For the work on this volume, we thank the members

of the Electrical committee:

Jack Davis, Community College of Baltimore County - Catonsville

Jim Halderman, Sinclair Community College

Megan Kuehm, Community College of Allegheny County

Frank Longbottom, Camden County College

Jeff Rehkopf, Florida Community College at Jacksonville

Randy Peters, Des Moines Area Community College

David Rodriguez, College of Southern Idaho

Ed Schauffler, Longview Community College

Vince Williams, Raytheon


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Contents

Module 18B Horn Systems

Acknowledgements .........................................................................................2Introduction ...................................................................................................... 4

Objectives ........................................................................................................4

Horn System Description and Operation 2004 Cavalier ................................................... 6

Cavalier 2004 Horn .......................................................................................................... 7

Cavalier 2003 Behind Left Side of Instrument Panel ...................................................... 8

Horn Circuit ..................................................................................................................... 9

Horns System Description and Operation 2004 Cadillac................................................ 10

Circuit Operation ........................................................................................................... 11

Horns Component View ................................................................................................. 12


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2002 General Motors Corporation

All Rights Reserved

ASE 6 - Electrica

Module 18B - H

Systems

18B-4

Student WorkbooIntroduction

Objectives

NATEF Area VI. A.

1. Identify and interpret electrical/electronic system concern; determine

necessary action.2. Research all applicable vehicle and service information, such as

electrical/electronic system operation, vehicle service history, service

precautions, and technical service bulletins.

3. Locate and interpret vehicle and major component identification

numbers (VIN, vehicle certification labels, and calibration decals).

4. Diagnose electrical/electronic integrity for series, parallel and series-

parallel circuits using principles of electricity (Ohms Law).

5. Use wiring diagrams during diagnosis of electrical circuit problems.

6. Demonstrate the proper use of a digital multimeter (DMM) duringdiagnosis of electrical circuit problems.

7. Check electrical circuits with a test light; determine necessary action.

8. Measure source voltage and perform voltage drop tests in electrical/

electronic circuits using a voltmeter; determine necessary action.

9. Measure current flow in electrical/electronic circuits and components

using an ammeter; determine necessary action.

10.Check continuity and measure resistance in electrical/electronic

circuits and components using an ohmmeter; determine necessary

action.

11. Check electrical circuits using fused jumper wires; determine

necessary action.

12.Locate shorts, grounds, opens, and resistance problems in electrical/

electronic circuits; determine necessary action.

13.Measure and diagnose the cause(s) of excessive key-off battery drain

(parasitic draw); determine necessary action.

14.Inspect and test fusible links, circuit breakers, and fuses; determine

necessary action.

15.Inspect and test switches, connectors, relays, solid state devices, and

wires of electrical/electronic circuits; perform necessary action.

16.Repair wiring harnesses and connectors.

17.Perform solder repair of electrical wiring.

18.Diagnose incorrect wiper operation; diagnose wiper speed control and

park problems; perform necessary action. P-2

19.Diagnose incorrect washer operation; perform necessary action. P-2


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ASE 6 - Electrica

Module 18B - H

Systems

18B-5

Student WorkbooSTC Tasks:

Identify causes of faults in automotive circuits

Select test procedures for locating faults in automotive circuits

Interpret the readings of a DMM display


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All Rights Reserved

ASE 6 - Electrica

Module 18B - H

Systems

18B-6

Student WorkbooHorn System Description and Operation 2004 Cavalier

System Description

The horn system consists of the following components:

HORN fuse

Horn relay

Horn slip ring

Horn

Body Control Module (BCM.)

System Operation

The vehicle horn is activated under the following conditions:

The horn switch is depressed.

The body control module (BCM) commands the horn on, if equipped withkeyless entry (AU0). The BCM commands the horn on under any of the

following conditions:

When the content theft deterrent system detects a vehicle intrusion. For

further information refer to Content Theft Deterrent (CTD) Description and

Operation in Theft Deterrent.

When the panic button is depressed on the remote control door lock

transmitter. For further information refer to Keyless Entry System

Description and Operation in Keyless Entry.

When the keyless entry system is used to lock the vehicle, a horn chirp

may sound to notify the driver that the vehicle has been locked. The

notification feature may be enabled or disabled through personalization.

For further information refer to Keyless Entry System Description and

Operation in Keyless Entry.

Circuit Operation

Battery positive voltage is applied at all times to the horn relay coil and the

horn relay switch. Pressing the horn switch applies ground to the horn relay

control circuit. The BCM may also apply ground to the horn relay control

circuit as described above. When the horn relay control circuit is grounded,the horn relay is energized and battery positive voltage is applied to the horn

through the horn control circuit. The horn sounds as long as ground is applied

to the horn relay control circuit.


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All Rights Reserved

ASE 6 - Electrica

Module 18B - H

Systems

18B-7

Student WorkbooCavalier 2004 Horn

(1) Front Impact Bar

(2) Horn

Figure 18B-1, Cavailer 2004 Horn


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ASE 6 - Electrica

Module 18B - H

Systems

18B-8

Student WorkbooCavalier 2003 Behind Left Side of Instrument Panel

(1) Body Control Module (BCM)

(2) BCM Connectors

(3) G204(4) G201

(5) Fuse Block I/P

(6) Horn Relay

Figure 18B-2, Behind Left Side Instrument Panel Cavalier 2003


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ASE 6 - Electrica

Module 18B - H

Systems

18B-9

Student Workboo

Figure 18B-3, Horn Circuit Early Production

Horn Circuit


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All Rights Reserved

ASE 6 - Electrica

Module 18B - H

Systems

18B-10

Student WorkbooHorns System Description and Operation 2004 Cadillac

System Description

The horn system consists of the following components:

The HORN fuse

The HORN SWITCH fuse

The Horn relay

The inflatable restraint steering wheel coil

The horn switch

The horns

The dash integration module (DIM)

System Operation

The vehicle horns are activated under the following conditions:

The horn switch is depressed.

The dash integration module commands the horns on. The DIM

commands the horns on under any of the following conditions:

When the content theft deterrent system detects a vehicle intrusion.

For further information refer to Content Theft Deterrent (CTD)

Description and Operation in Theft Deterrent.

When the keyless entry system is used to lock the vehicle, a horn chirp

may sound to notify the driver that the vehicle has been locked. The

notification feature may be enabled or disabled through

personalization. For further information refer to Keyless Entry System

Description and Operation in Keyless Entry.

When the panic button is depressed on the remote control door lock

transmitter. For further information refer to Content Theft Deterrent

(CTD) Description and Operation in Theft Deterrent.

When the OnStar system is used to sound the horn. For further

information refer to OnStar Description and Operation in Cellular

Communications.


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All Rights Reserved

ASE 6 - Electrica

Module 18B - H

Systems

18B-11

Student WorkbooCircuit Operation

Battery positive voltage is applied at all times to the horn relay coil and the

horn relay switch. Pressing the horn switch applies ground to the horn relay

control circuit. The DIM may also apply ground to the horn relay control circuit

as described above. When the horn relay control circuit is grounded, the horn

relay is energized and battery positive voltage is applied to the horns through

the horn control circuit. The horns sound as long as ground is applied to thehorn relay control circuit.

Figure 18B-4, Circuit Operation


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ASE 6 - Electrica

Module 18B - H

Systems

18B-13

Student Workboo

CustomerNam

e

Date

VehicleNumber

A

6Electrical

StreetAddress

Tec

hnicianName

Module18Horns

CityandZip

Tec

hnicianName

W

orkstation#1

HomePhone

WorkPhone

Year/Make/Model

Tec

hnicianName

2003ChevroletCavalier

VehicleIdentif

icationNumber

Mileage

Engine

License

Color

Tec

hnicianName

Descriptions/Instructions

Complain

t:HornInoperative(RecordallanswerstothesequestionsonPag

e34)

UseSIto

provideinformationtodiagnoseconcern

Useappropriatetestequipmenttoinclude

multimeter,TechII,15ampFused

jumperwire,andtestlight.

1.ReadCircuitDescriptionandOperation

andrecordthedocumentID#

2.Review

wiringschematicsandrecordth

edocumentID#

3.Review

theDiagnosisChartsandchoos

ethecorrectcharttobeginyourdiagnosis.RecordthedocumentID#

4.WhatisthefirststepintheDiagnosisprocess?

5.Demonstratetoyourinstructorthestep

stakentodeterminethecauseof

thesymptom.

6.Summ

arizetheentireprocessanddesc

ribewhatyoulearned.


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ASE 6 - Electrica

Module 18B - H

Systems

18B-14

Student Workboo

COMPONENTLOCATION

SERVICE

INFORMATIONDOCUMENT#S

Horn

HornRelay

HornFuse

G102

S103

TECH2DATA/DTC

SPECIALFUNCTIONS

SPECIALTOOLS

TESTPROCEDURES

Multimeter,TestLight,TechII

WHATISTHEROOTCAUSE?

INSTRUCTOR

INITIALS


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ASE 6 - Electrica

Module 18B - H

Systems

18B-16

Student Workboo

SWB a6 m18b Final

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