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

www.TechnicalBooksPDF.com
122 Chapter Six
Figure 6-57.
DaimlerChrysler radio circuit. (DaimlerChrysler Corporation)
Figure 6-62 is a GM installation diagram for the
fuel-economy indicator switch. The circuit diagram
for this accessory was given in Figure 6-59.
Compare these two diagrams and note that the
installation diagram focuses on the harness and circuit
location while the schematic diagram shows a
specific circuit current reading top to bottom.
Troubleshooting with
Schematic Diagrams
It is quicker and easier to diagnose and isolate
an electrical problem using a schematic diagram
than by working with a system diagram, because
schematic diagrams do not distract or confuse with
wiring that is not part of the circuit being tested.
Aschematic diagram shows the paths that electrical
current takes in a properly functioning circuit. It is
important to understand how the circuit is supposed
to work before determining why it is malfunctioning.
For more information about troubleshooting
with schematic diagrams, see the “Copper Wiring
Repair” section in Chapter 6 of the Shop Manual.
General Motors incorporates a special troubleshooting
section in each shop manual for the
entire electrical system, broken down by individual
circuits (Figures 6-48 and 6-60). Each
schematic contains all the basic information
necessary to trace the circuit it covers: wire size