Lexus ES300 (2002 year). Manual — part 87
BODY ELECTRICAL
BODY ELECTRICAL – BODY ELECTRICAL SYSTEM CONTROL
BE-2
211BE01
Front Passenger
Door ECU
Rear RH Door ECU
BEAN
Theft Deterrent ECU
Body ECU
Local Communication
Driver Door ECU
Rear LH Door ECU
BODY ELECTRICAL SYSTEM CONTROL
MULTIPLEX COMMUNICATION SYSTEM
1. General
A multiplex communication system has been adopted for body electrical system control and to achieve
a slimmer wiring harnesses configuration.
BEAN (Body Electronics Area Network) has been adopted between the body ECU, driver door ECU, front
passenger door ECU, theft deterrent ECU.
The local protocol unidirectional communication has been adopted between the body ECU, rear RH door
ECU, rear LH door ECU.
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
BODY ELECTRICAL – BODY ELECTRICAL SYSTEM CONTROL
BE-3
211BE02
Body ECU
Theft Deterrent ECU
Front Passenger Door ECU
Rear RH Door ECU
Rear LH Door ECU
Driver Door ECU
Layout of Main Component
BODY ELECTRICAL – BODY ELECTRICAL SYSTEM CONTROL
BE-4
208BE03
208BE51
Battery
Switch
ECU
On
On
Off
Serial Data
Communication
ECU
Light
Motor
Heater
Solenoid
Battery
Switch
Light
Motor
Heater
Solenoid
Multiplex Communication System
Conventional System
2. System Outline
In the conventional system, electrical loads such as motors and lights were directly connected by wire harness
to their switches which controlled their operation. However, in the multiplex communication system, the wire
harness is replaced by serial data communication by the ECU, to provide functions similar to the conventional
system, through a single serial communication bus. With this system, even when multiple tasks demand addi-
tional switches and electrical loads, communication among ECUs can be implemented through the serial
communication bus only, resulting in the only reduction in wire harnesses.
Conceptual Drawing of Multiplex Communication System
BODY ELECTRICAL – ACCESSORIES
BE-62
211BE40
(2)
(5)
(4)
(3)
(1)
Lumber Support Switch
(Driver Seat)
Power Seat Switch
211BE41
Battery
Power Seat Switch
Slide
Front
Vertical
Rear
Vertical
Reclining
Lumber
Support
Switch
(Driver Seat)
Lumber
Support
POWER SEAT
The power seat has been adopted for driver and front passenger seats on all models as standard equipment.
The following features are all for power functions.
Power Adjustment Function
Stroke
(1)
Fore-and-After Slide
mm (in.)
240 (9.45)
(2)
Reclining
degrees
48
(3)
Front Vertical
mm (in.)
22 (0.87)
(4)
Rear Vertical
mm (in.)
45 (1.77)
(5)
Lumber Support (Driver Seat)
mm (in.)
48 (1.89)
System Diagram
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