Electrical - Chevrolet Captiva Manual

TRAINING
CAN-Bus System
The extensive application on a CAN-Bus system in
the Captiva has thrown the conventional function-
ing of systems upside down. Although the differ-
ent functioning of the CAN-Bus system may not be
evident for a driver in everyday life, the way of
thinking about the electrical system for the after-
sales organisation must undergo changes to be
able to understand and diagnose the system.
The exchange of information between control
modules can be achieved using the following pos-
sibilities:
1. Separate wires
2. Data bus
Separate wires
Each piece of information is exchanged over a sep-
arate wire
Disadvantage
With an increasing quantity of information, the
●
number of wires in the cable harness also
increases, which increases the possibility of
faults
Separate wires
34

Electrical

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Data bus
A data bus can be visualised as an ordinary coach.
As a coach transports large quantities of people
between several locations, the data bus transports
large quantities of information between several
control modules: data exchange. The exchange of
data between the individual control modules lets
the units operate as a functional system. The more
information a control module has on the state of
the total system, the better it can co-ordinate its
individual functions.
Advantages
Fewer sensors and signal wires due to multiple
●
use of a sensor signal
Fewer wires in the cable harness
●
Considerable weight reduction in the wiring
●
harness
Fewer plug-in terminals in the control module
●
connectors
Improved reliability and serviceability
●
Large variety of new comfort functions
●
Data bus