ELECTRIC MULTIPLEXING: Itís here! Multiplexing,
the next major advancement in automotive electrical circuits
and controls has been appearing in some vehicles over the
last few production years and will soon be found on most
What is it? Multiplexing is a system where several
signals may be sent through a single wire essentially at the
same time. The advantages of this are substantial.
Consider the weight reduction in wiring harnesses alone.
What does it mean to Technicians? There is an
interesting challenge here for Technicians in understanding
how a multiplexer (MUX) can stuff all these signals into one
end of a single circuit and extract them from the other end,
sending them to the right components (DEMUX). Added to this
is the ability to diagnose and troubleshoot these systems
when they do not do what they are supposed to.
Energy Transfer Technology offers a two-day program on
multiplexing which includes the following:
a brief but thorough review of electrical circuits
a review of transistors, diodes and logic gates
operation and function of multiplexers
operation and function of demultiplexers
diagnosing by codes, flowcharts and wiring diagrams
hands-on practical application on vehicles
The first portion of the program is spent in classroom
covering electrical and electronic systems and multiplexing
principles of operation. This is done through the use of
power point presentation, wiring diagrams and components.
This is followed by the practical portion at the
vehicles. This includes component locating, use of scan
tools and diagnostic equipment, data stream interpretation
The focus of this program is to provide the Technicians
with the basic skills in working with multiplexing in
general and specifically with the vehicles used in delivery
of the program.