Before using the ABS/TCS procedures, you must have a basic knowledge of the following items. Without this basic knowledge, it will be difficult to use the diagnostic procedures.

1. Basic Electrical Circuits

•	The basic theory of electricity

•	Definitions of voltage, current (amps), and resistance (ohms)

•	Open/shorted wires

•	How to read a wiring diagram

2. Use of Circuit Testing Tools

•	The J 39200 DMM and the use of the meter controls

•	How to measure voltage, resistance, and current

•	Use of jumper wires in order to bypass components in testing circuits

If you need a review of basic electrical troubleshooting knowledge, refer to Troubleshooting Procedures Cell 4 in Electrical Diagnosis contains helpful information in the introduction. Basic use of the circuit testing tools is also covered. Additionally, electrical/electronic courses are Offered through General Motors Training.