3
Electrical
46
PA1
2020-05-12
S023074
When you drill holes for additional wiring:
CAUTION
Before you drill into the vehicle, you must examine the Drill Zones,
page 20
document. This will help you to avoid damage to other components.
– Make holes the same size as the connectors. Do not assemble connectors after the wiring is
installed.
– Do a check for components or wiring behind the panel before you drill a hole.
– Use a drill or cone cutter to make the hole.
– Remove sharp edges and swarf from the hole.
Communications Network
Networks Overview
The electrical and electronic systems installed on the vehicle are not independent of each other.
Each system can influence and complement the others to increase the safety of the occupants
and the efficiency of the vehicle. Individual components need to be networked so that the high
level of information that is managed by the individual systems can also be used elsewhere
throughout the vehicle. To enable systems to communicate accurately and with high levels of
reliably, a range of digital networks are used on the vehicle. The network type used for each
system is chosen depending on the accuracy and reliability requirements of the system.
Network types used on the vehicle include: Flexray, CAN, LIN, MOST and APIX2. Each network
type communicates with other components by sending short digital messages transmitted
through a series of wires and connectors called a BUS. These messages contain information
necessary for the satisfactory operation of the systems in the network groups. Messages sent
on certain networks, for example the chassis network, are sent to follow a protocol. This
protocol ensures that the most important or safety critical information has priority on the
network.
Flexray
The flexray network forms the backbone of the vehicle systems communication network. It
operates at high speed and is very reliable. This network has a message transfer rate of 10
Mbit/s. (10,000,000 bits per second).The FlexRay network connects seven control modules.
Control Module Description
Vehicle Dynamics Domain Master (VDDM) Handles chassis functions and powertrain
functions such as suspension, stability control,
engine and braking
Supplemental Restraint System Module (SRS) Handles safety functions such as airbags and
seat belt pretension.
Active Safety Domain Master (ASDM) Handles active safety functions, such as
collision avoidance and mitigation.
To Next Page
Loading...
