Repair and Diagnosis: Description and Operation

The chassis electrical system is a 12-volt system with a negative ground polarity.
Wire size are appropriate to respective circuits, and classified by color. (The classification of harnesses by color is shown on the circuit diagram
for ease of harness identification.)
The wire size is determined by load capacity and the length of wire required.
The vehicle harnesses are: body harness, chassis harness, engine room harness, instrument harness, transmission harness, engine ECGI harness, dome light harness, door harness, rear body harness, tailgate harness, SRS harness and battery cables.
The harnesses are protected either by tape or corrugated tube, depending on harness location.
The circuit for each system consists of the power source, wire, fuse, relay, switch, load parts and ground, all of which are shown on the circuit diagram.
In this section, each electrical device is classified by system.
For major parts shown on the circuit based on the circuit diagram for each system, a summary, diagnosis of troubles and inspection procedures are detailed.