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June 2013
Electrical Systems Operation & Diagnosis Module (602)
A Controller Area Network (CAN) signal is composed of two separate pulses. One pulse is low
voltage changing to high voltage and one pulse is high voltage changing to low voltage. Each pulse
has its own wire. The two pulses are sent simultaneously from one control unit to all the other
control units on the Local Area Network (LAN). A control unit receiving the two pulses compares
the potential difference between them.
Potential Difference
Each control module has a transmitter and receiver, which enables bidirectional communication
among the control modules.
Bidirectional Communication
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