AUT 242



Course Description

Introduces electricity and magnetism, symbols and circuitry as applied to the alternators, regulators, starters, lighting systems, instruments, gauges, and accessories. Lecture 3 hours.  Laboratory 3 hours. Total 6 hours per week.


General Course Purpose

This course is part two of a two part series of Automotive Electricity and places particular emphasis on automotive accessory systems. Detailed trouble shooting diagnosis and repair procedures using modern testing equipment is covered in depth. Particular attention is given to determining electrical systems defects, their probable cause, and what repairs and adjustments are required for correction. Lecture demonstrations will cover in detail fundamentals and theory of operation of accessory systems. Students will develop an understanding of each of these electrical systems to include its construction, purpose, service requirements, and how it functions in the modern automobile. Laboratory experience is provided in the use of diagnostic equipment and applicable test equipment in trouble shooting and adjusting or correcting electrical systems defects.


Course Prerequisites/Co-Requisites

Ability to read, write, and speak the English language. AUT 241 is necessary and recommended before AUT 242 is taken.


Course Objectives

Upon completion of this course, the student should have a:


·      working knowledge of analog and digital instrumentation

·      working knowledge of power-operated accessories to include; pulse windshield wipers, power windows, power locks and power seats

·      working knowledge of warning, security, audio systems and cruise control

·      detailed knowledge of possible defects, troubleshooting procedures, diagnosis and repairs or adjustment needed to correct the above electrical system's defects

·      working knowledge of basic electronic circuits used in the modern automobile

·      working knowledge of possible system defects, troubleshooting procedures, diagnosis, repair and adjustment  techniques of electronic ignition systems

·      working knowledge of electronic engine controls, possible defects, troubleshooting procedures, diagnosis, repair and adjustment techniques


Major Topics to be Included


a.    Electrical diagnosis and procedures

b.   Horns and buzzer warning systems

c.    Instrument panel gauges and indicator lights

d.   Power seats and power windows

e.    Electric windshield wipers and washers

f.    Security systems

g.    General electrical system diagnosis

h.   Electrical and electronic basics review

i.     Electronic test equipment, including digital volt, ohm and amp meter use

j.     Introduction to oscilloscope use








Keith Brown

Bisdorf/ AA Bldg, Room 352

703.845.4623 (office)

703.845.6006 (fax)

703.618.6844 (cell)



Note: Instructor office hours are available at the administrative desk in the AA/Bisdorf Building, room 352, online at , or by calling 703.845.6341


Class Meeting Days and Times

Wednesdays 4:30 pm to 10:30 pm




“Diagnosis and Troubleshooting of Automotive Electrical, Electronic, and Computer Systems” 6th Edition

James D. Halderman

Prentice Hall

ISBN # 9780132551557




Letter-grade equivalents: A = 91-100

                                         B = 81-90

                                         C = 71-80

                                         D = 61-70

                                         F = 60 and below


Student responsibilities and requirements:



·         If you are seeking special accommodations based on a disability, you must provide an Accommodations Memorandum. This can be obtained from the Disability Counselor, located in the Bisdorf/AA building, Room 193. The telephone number is 703.845.6208.

·         Students should expect to spend a minimum of two hours per week outside of class for proper preparation and completion of homework. Your success in this course will largely depend on your desire and interest in the subject and the effort you are willing to put forth.


·         Please feel free to discuss any concerns or problems regarding the course with the instructor. Your feedback is essential to the quality of this course.



·   If you are not present for any class sessions by February 1, you will be automatically withdrawn by the instructor.

·   The last day to drop the class with tuition refund is February 1

·   March 25 is the last day to withdraw from the class without a grade penalty. The instructor may withdraw a student at this time if attendance is below 60%.

·   Any student that wishes to change their enrollment status to audit must do so by February 1 pending instructor approval.