Handbook 652 Body Electrical Diagnosis Reading the System System circuit diagrams contain a large amount of information, in both written and graphical form, including: Circuit Diagram • Wire colors • Junction and relay block identification • Component and part identification • Connectors and pin numbers • Wire harness connectors • Switches and relays • Splice points • System outline and service hints To effectively use this information you need to know the meanings of the abbreviations and symbols. You also need to know how to use the cross reference tables to find information in other support sections of the EWD.
NOTE The positions of switches and relays in the system circuit diagrams are based on the vehicle ignition in the OFF position with no keys in the vicinity. Technical Training 65