Electrical System - Volkswagen Golf Plus 2005 Service Training Manual

Electrical system

Overview of networked electronic control units
When fitted with maximum equipment, the following
electronic control module configuration can be found
in the Golf Plus.
As in the Golf 2004, the diagnostic interface for data
bus J553 acts as the interface between the different
data buses. It also ensures that data exchange
between data buses with different speeds
is carried out in an optimal manner.
In addition to the conventional comfort, powertrain
and infotainment CAN bus systems, internal
communication between the vehicle module or sub-
system components frequently takes place via
separate CAN links.
These bus links, which are dependent on the
different manufacturers, may differ from the above
mentioned links, which operate with high- and low-
speed signal forms, not only in terms of their
transmission protocols, but also physically.
This different behaviour must be taken into
consideration in the case of direct measurements on
CAN systems and their electronic control units.
30
T16
b
J553
J503
R
J412
J525
J364
R78
Legend
CAN powertrain data bus
CAN comfort data bus
CAN infotainment data bus
CAN sensor data bus
a
CAN instrument cluster data bus
CAN diagnostic data bus
b
J220
J745
J668
a
J334
J285
J345 J608
J519
J255 J136
J386 J388
J387 J389