Handbook 652 Body Electrical Diagnosis Using the “Tree” Like most service information on TIS, the EWD Viewer uses a menu “ tree ” for navigation. The tree in the EWD Viewer is organized differently, however, than the trees you find in the Repair Manual, New Car Features Manual, and other service documents on TIS. The EWD Viewer tree is designed specifically for finding electrical wiring information. The main headings in the EWD Viewer tree are: • Introduction • System Circuit • Location & Routing • Fuse List • Connector List • Overall EWD Technical Training 101