Lexus RX300 (MCU15). Service manual - part 60
BE
BODY ELECTRICAL — MULTIPLEX COMMUNICATION SYSTEM
BODY ELECTRICAL
113
MULTIPLEX COMMUNICATION SYSTEM
JDESCRIPTION
D A multiplex communication system has been adopted for body electrical system control and to achieve
a slimmer wiring harnesses configuration.
D The BEAN (Body Electronics Area Network) has been adopted between the body ECU, engine ECU,
air conditioner and combination meter integrated ECU, theft deterrent ECU, double lock ECU, driver
door ECU, front passenger door ECU, rear RH door ECU, rear LH door ECU, moon roof control ECU,
and center cluster integration panel ECU. Furthermore, AVC-LAN (Audio Visual Communication-Local
Area Network) has been adopted between the center cluster integration panel ECU, multi display, audio
unit, CD automatic changer, and navigation ECU.
The conversion of communication signals between BEAN and AVC-LAN is performed by the center
cluster integration panel ECU.
D A customized body electronics system, which improves the malfunction diagnostic function, enables
the functions to be changed according to customer needs, and reduce the types of parts, has been adopted.
" System Diagram A
187BE19
: BEAN
: AVC-LAN
Front Passenger
Door ECU
Rear RH
Door ECU
Engine ECU
A/C and
Combination
Meter Integrated
ECU
Theft Deterrent
ECU
Double Lock ECU
Body ECU
Moon Roof
Control ECU*
1
Center Cluster
Integrated Panel
ECU
CD Automatic
Changer*
2
Multi Display
Navigation
ECU*
3
Audio Unit
Driver Door
ECU
Rear LH
Door ECU
*
1
: with Moon Roof
*
2
: with CD Automatic Changer
*
3
: with GPS Voice Navigation System