Toyota Sequoia (2005). Manual — part 523
DIDF6–01
–
DIAGNOSTICS
MULTIPLEX COMMUNICATION SYSTEM
DI–1887
2081
MULTIPLEX COMMUNICATION SYSTEM
PRECAUTION
NOTICE:
When disconnecting the battery terminal, initialize the following system after the terminal is recon-
nected.
System Name
See Page
Back Door Power Window Control System
DIDF7–01
I28466
DLC 3
Front
Passenger
Door ECU
Body ECU
A/C ECU
Combination
Meter
Back Door
ECU
Driver Door
ECU
MPX1
MPX2
MPX3
Slide Roof
ECU
Memory
Seat ECU
& Switch
MPX1
MPX2
MPX1
MPX2
MPX1
MPX2
MPX–
MPX+
MPX1
MPX1
SIL
Automatic Light
Control Sensor
Wireless Door
Control Receiver
Airbag Sensor Assy
Diagnostic Bus
BEAN
CLTS
CLTB
CLTE
PRG
GSW
OBD2
PDA
DI–1888
–
DIAGNOSTICS
MULTIPLEX COMMUNICATION SYSTEM
2082
SYSTEM DIAGRAM
DIDFN–01
B78765
I28978
Battery
Serial Communication
Switch
ECU
On
On
Off
ECU
Light
Motor
Heater
Solenoid
Conceptual Drawing
I28977
Frame
Data
Header
End Message
–
DIAGNOSTICS
MULTIPLEX COMMUNICATION SYSTEM
DI–1889
2083
SYSTEM DESCRIPTION
Basic of MPX (Multiplex Communication)
1.
General
The SEQUOIA multiplex communication system uses serial communication, which converts multiple pieces
of information into serial communication data. As a result, they can be transmitted through a single commu-
nication wire.
Serial communication data consists of bits and frames. A bit is the basic unit that represents the amount of
information. A bit is represented by a binary value ”0” or ”1”. A frame is a body of data that is transmitted
together. A frame contains a ”header” that indicates the beginning of the data and an ”end message” that
indicates the end of the data.
B78774
I28976
ECU
ECU
ECU
ECU
Daisy
Chain
Open
DI–1890
–
DIAGNOSTICS
MULTIPLEX COMMUNICATION SYSTEM
2084
2.
Network Style
Based on serial communication, various ECUs are connected on a network to exchange various pieces of
information. Such a system is called a multiplex communication system.
The BEAN (Body Electronics Area Network) uses the ring and bus styles of networks to connect ECUs.
This connection style is called a daisy chain. In the daisy chain, communication can be maintained
even if there is an area that has an open circuit.
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