This document provides an overview and explanation of how to use the service manual for 1989-1990-1991-1992-1993 vehicles. It includes definitions of common terms, explanations of manual contents and diagrams, troubleshooting guides, and vehicle identification information. Specifically, it outlines the scope of maintenance procedures, how the manual is organized, how to read diagrams and circuit drawings, where to find troubleshooting guides, and the location and format of vehicle identification numbers. The purpose is to help technicians properly service and maintain vehicles using the information in the manual.