ELECTRICAL/ELECTRONIC SYSTEMS

For every task in Electrical/Electronic Systems, the following safety requirement must be strictly enforced:

Comply with personal and environmental safety practices associated with clothing; eye protection; hand tools; power equipment; proper ventilation; and the handling, storage, and disposal of chemicals/materials in accordance with local, state, and federal safety and environmental regulations.

VI. ELECTRICAL/ELECTRONIC SYSTEMS

A. General Electrical System Diagnosis

1. Identify and interpret electrical/electronic system concern; determine necessary action. P-1

2. Research applicable vehicle and service information, such as electrical/electronic system operation, vehicle service history, service precautions, and technical service bulletins. P-1

3. Locate and interpret vehicle and major component identification numbers (VIN, vehicle certification labels, and calibration decals). P-1

4. Diagnose electrical/electronic integrity for series, parallel and series-parallel circuits using principles of electricity (Ohm’s Law). P-1

5. Use wiring diagrams during diagnosis of electrical circuit problems. P-1

6. Demonstrate the proper use of a digital multimeter (DMM) during diagnosis of electrical circuit problems. P-1
7. Check electrical circuits with a test light; determine necessary action. P-2

8. Measure source voltage and perform voltage drop tests in electrical/electronic circuits using a voltmeter; determine necessary action. P-1

9. Measure current flow in electrical/electronic circuits and components using an ammeter; determine necessary action. P-1

10. Check continuity and measure resistance in electrical/electronic circuits and components using an ohmmeter; determine necessary action. P-1

11. Check electrical circuits using fused jumper wires; determine necessary action. P-2

12. Locate shorts, grounds, opens, and resistance problems in electrical/electronic circuits; determine necessary action. P-1

13. Measure and diagnose the cause(s) of excessive key-off battery drain (parasitic draw); determine necessary action. P-1

14. Inspect and test fusible links, circuit breakers, and fuses; determine necessary action. P-1

15. Inspect and test switches, connectors, relays, solid state devices, and wires of electrical/electronic circuits; perform necessary action. P-1

16. Repair wiring harnesses and connectors. P-1

17. Perform solder repair of electrical wiring. P-1

VI. ELECTRICAL/ELECTRONIC SYSTEMS

B. Battery Diagnosis and Service

1. Perform battery state-of-charge test; determine necessary action. P-1

2. Perform battery capacity test; confirm proper battery capacity for vehicle application; determine necessary action. P-1

3. Maintain or restore electronic memory functions. P-1

4. Inspect, clean, fill, and replace battery. P-2

5. Perform slow/fast battery charge. P-2

6. Inspect and clean battery cables, connectors, clamps, and hold-downs; repair or replace as needed. P-1

7. Start a vehicle using jumper cables and a battery or auxiliary power supply. P-1

VI. ELECTRICAL/ELECTRONIC SYSTEMS

C. Starting System Diagnosis and Repair

1. Perform starter current draw tests; determine necessary action. P-1

2. Perform starter circuit voltage drop tests; determine necessary action. P-1

3. Inspect and test starter relays and solenoids; determine necessary action. P-2

4. Remove and install starter in a vehicle. P-1

5. Inspect and test switches, connectors, and wires of starter control circuits; perform necessary action. P-2

6. Differentiate between electrical and engine mechanical problems that cause a slow-crank or no-crank condition. P-2

VI. ELECTRICAL/ELECTRONIC SYSTEMS

D. Charging System Diagnosis and Repair

1. Perform charging system output test; determine necessary action. P-1

2. Diagnose charging system for the cause of undercharge, no-charge, and overcharge conditions. P-1

3. Inspect, adjust, or replace generator (alternator) drive belts, pulleys, and tensioners; check pulley and belt alignment. P-2

4. Remove, inspect, and install generator (alternator). P-1

5. Perform charging circuit voltage drop tests; determine necessary action. P-1

VI. ELECTRICAL/ELECTRONIC SYSTEMS

E. Lighting Systems Diagnosis and Repair

1. Diagnose the cause of brighter than normal, intermittent, dim, or no light operation; determine necessary action. P-1

2. Inspect, replace, and aim headlights and bulbs. P-2

3. Inspect and diagnose incorrect turn signal or hazard light operation; perform necessary action P-2

VI. ELECTRICAL/ELECTRONIC SYSTEMS

F. Gauges, Warning Devices, and Driver Information Systems Diagnosis and Repair

1. Inspect and test gauges and gauge sending units for cause of intermittent, high, low, or no gauge readings; determine necessary action. P-1

2. Inspect and test connectors, wires, and printed circuit boards of gauge circuits; determine necessary action. P-3

3. Diagnose the cause of incorrect operation of warning devices and other driver information systems; determine necessary action. P-1

4. Inspect and test sensors, connectors, and wires of electronic instrument circuits; determine necessary action. P-2

VI. ELECTRICAL/ELECTRONIC SYSTEMS

G. Horn and Wiper/Washer Diagnosis and Repair

1. Diagnose incorrect horn operation; perform necessary action. P-2

2. Diagnose incorrect wiper operation; diagnose wiper speed control and park problems; perform necessary action. P-2

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

VI. ELECTRICAL/ELECTRONIC SYSTEMS

H. Accessories Diagnosis and Repair

1. Diagnose incorrect operation of motor-driven accessory circuits; determine necessary action. P-2

2. Diagnose incorrect heated glass operation; determine necessary action. P-3

3. Diagnose incorrect electric lock operation; determine necessary action. P-2

4. Diagnose incorrect operation of cruise control systems; determine necessary action. P-3

5. Diagnose supplemental restraint system (SRS) concerns; determine necessary action. (Note: Follow manufacturer’s safety procedures to prevent accidental deployment.) P-2

6. Disarm and enable the airbag system for vehicle service. P-1

7. Diagnose radio static and weak, intermittent, or no radio reception; determine necessary action. P-3

8. Remove and reinstall door panel. P-1

9. Diagnose body electronic system circuits using a scan tool; determine necessary action. P-2

10. Check for module communication errors using a scan tool. P-3

11. Diagnose the cause of false, intermittent, or no operation of anti-theft system. P-2