ASE 6 - Electrical. Module 18B Horn Systems

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1 Module 18B Horn

2 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 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 committees worked 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

3 Module 18B Horn Contents Acknowledgements... 2 Introduction... 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 Circuit Operation Horns Component View... 12

4 Introduction 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 seriesparallel circuits using principles of electricity (Ohm s Law). 5. Use wiring diagrams during diagnosis of electrical circuit problems. 6. Demonstrate the proper use of a digital multimeter (DMM) during diagnosis 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 Diagnose incorrect washer operation; perform necessary action. P-2 18B-4

5 STC Tasks: Identify causes of faults in automotive circuits Select test procedures for locating faults in automotive circuits Interpret the readings of a DMM display 18B-5

6 Horn 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 with keyless 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. 18B-6

7 Cavalier 2004 Horn Figure 18B-1, Cavailer 2004 Horn (1) Front Impact Bar (2) Horn 18B-7

8 Cavalier 2003 Behind Left Side of Instrument Panel Figure 18B-2, Behind Left Side Instrument Panel Cavalier 2003 (1) Body Control Module (BCM) (2) BCM Connectors (3) G204 (4) G201 (5) Fuse Block I/P (6) Horn Relay 18B-8

9 Horn Circuit Figure 18B-3, Horn Circuit Early Production 18B-9

10 Horns 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. 18B-10

11 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 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 the horn relay control circuit. Figure 18B-4, Circuit Operation 18B-11

12 Horns Component View Figure 18B-5, Horns Component 18B-12

13 Customer Name Date Vehicle Number A6 Electrical Street Address Technician Name Module 18 Horns City and Zip Technician Name Workstation # 1 Home Phone Work Phone Year / Make / Model Technician Name 2003 Chevrolet Cavalier Vehicle Identification Number Mileage Engine License Color Technician Name Descriptions / Instructions Complaint: Horn Inoperative (Record all answers to these questions on Page 3 4) Use SI to provide information to diagnose concern Use appropriate test equipment to include multimeter, Tech II, 15 amp Fused jumper wire, and test light. 1. Read Circuit Description and Operation and record the document ID # 2. Review wiring schematics and record the document ID # 3. Review the Diagnosis Charts and choose the correct chart to begin your diagnosis. Record the document ID # 4. What is the first step in the Diagnosis process? 5. Demonstrate to your instructor the steps taken to determine the cause of the symptom. 6. Summarize the entire process and describe what you learned. 18B-13

14 COMPONENT LOCATION SERVICE INFORMATION DOCUMENT #S Horn Horn Relay Horn Fuse G102 S103 TECH 2 DATA / DTC SPECIAL FUNCTIONS SPECIAL TOOLS TEST PROCEDURES Multimeter, Test Light, Tech II WHAT IS THE ROOT CAUSE? INSTRUCTOR INITIALS 18B-14

15 Record all answers to the Questions on Page 1 here. 18B-15

16 18B-16

ASE 7 - HVAC. Module 2 AC Compressors

ASE 7 - HVAC. Module 2 AC Compressors ASE 7 - HVAC Module 2 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