Automotive Electrical and Electronic Systems Classroom Manual Fifth Edition Update by John F. Kershaw

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Electrical Diagrams and Wiring 121
Figure 6-56. Toyota system diagrams are organized by individual systems and include ground points. (Reprinted
by permission of Toyota Motor Corporation)
positions are not clear, find that information elsewhere
in the electrical section of the manufacturer’s
shop manual.
Installation Diagrams
None of the diagrams shown so far have indicated
where or how the wires and loads are
installed in the automobile. Many manufacturers
provide installation diagrams, or pictorial diagrams
that show these locations. Some original
equipment manufacturers (OEM) call these diagrams
product description manuals (PDMs).
Figures 6-61 and 6-62 show different styles of
installation diagrams that help locate the general
harness or circuit.
The DaimlerChrysler installation diagram in
Figure 6-61 includes the wiring for radio speakers.
The circuit diagram for the speakers was shown in
Figure 6-57. Compare these two diagrams and
notice that the installation diagram highlights the
location of circuits while the circuit diagram gives
more of a detailed picture of the circuit.