SYSTEM OVERVIEWS

CAN-BUS Operation
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The CAN-BUS is a system that some control modules use to communicate with each other.
It is made up of two wires that connect to multiple control modules.

CAN-BUS Operation
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These wires are bi-directional, allowing data to be both sent and received. The two wires
are referred to as CAN-High and CAN-Low.

CAN-High

‘CAN-Low

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Data transfer along these two wires
works like a telephone conference call.

Any control module connected to the Semone oye

CAN-BUS can speak and other control

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Data transfer along these two wires
works like a telephone conference call.

Any control module connected to the

CAN-BUS can speak and other control ©1357 Ponsenge: Site
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The other control modules can use or
ignore the data.

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The CAN-BUS not only reduces the wires
going to each component, but it increases
the speed of data transfer between control Non CAN-BUS
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The CAN-BUS not only reduces the wires
going to each component, but it increases

the speed of data transfer between control ‘ous Sion
modules.

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Each control module sends its data about 2 woronctnonecaneintoa | [9 Comsat) joe

every 20 milliseconds. Data transfer between : || @ A

control modules takes approximately 1 sma cttson | |manet neon
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In a vehicle such as the Passat, there are
two CAN-BUS lines, the Powertrain CAN-BUS
and the Convenience CAN-BUS.

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Powertrain

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Convenience

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Gateway

In a vehicle such as the Passat, there are
two CAN-BUS lines, the Powertrain CAN-BUS
and the Convenience CAN-BUS.

The Powertrain CAN-BUS operates at 500 5217 weventodon Cone tole
kilobytes per second and the Convenience

CAN-BUS operates at 100 kilobytes

per second.

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Since these two lines cannot understand each
other, they need a translator to be able to share
signals.

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Powertrain

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Convenience

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Gateway

Since these two lines cannot understand each
other, they need a translator to be able to share
signals.

That translator is J533, referred to as the "Gateway." 2217 “emmsvonconwot toate

Powertrain
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Convenience

CAN-BUS Ope n
J533, the Gateway, is located in J285, the
Control Module with Indicator Unit in
Instrument Panel Insert, and either speeds

up or slows down signals so that control
modules on different CAN-BUS lines can

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Powertrain

Convenience

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The CAN-BUS has fault memory and DTCs.

Guided Fault Finding in the VAS 5051 is used
to diagnose and repair the CAN-BUS system.

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Powertrain

Convenience