Toyota Camry Hybrid AHV40 Manual page 264

BODY ELECTRICAL - MULTIPLEX COMMUNICATION
— REFERENCE —
MPX communication uses serial communication data that consists of bits and frames in order to exchange
information among the various ECUs. This allows a reduction of the amount of wiring on the vehicle.
D A bit is the basic unit of communication that is used to represent the information. A bit is represented by
binary values of 0 or 1.
D A frame is a body of data that is transmitted together. A frame contains a header that indicates the
beginning, and an end message that indicates the end.
"
Conceptual Drawing
1
0
Header
Switch
Battery
A
Frame
Data
Serial Communication Data
On
Off
ECU
End Message
On
ECU
BE-3
240BE05
Light
Motor
Heater
Solenoid
240BE03