System Diagram

MULTIPLEX COMMUNICATION SYSTEM (BEAN) DESCRIPTION
1. The BEAN communication line is used to control the following items:
  - Airbag sensor assembly (Airbag ECU)
  - Combination meter assembly (Meter ECU)
  - Power window regulator master switch assembly
  - A/C amplifier (A/C ECU)
  - Multiplex tilt & telescopic ECU
  - Transponder key ECU
  - ECM
  - Center cluster integration switch assembly
  - Network gateway ECU
  - Rain sensor
  - Sliding roof drive gear assembly (Sliding roof ECU)
  - Headlight swivel ECU (AFS ECU)
  - Multiplex network door ECU back (Power back door ECU)
  - Position control ECU & switch assembly (Power seat ECU)
  - Windshield wiper relay assembly (Wiper ECU)
  - Driver side outer mirror control ECU
  - Passenger side outer mirror control ECU
  If there is a short-circuit (bus-down) in the line, communication to the system that has a short-circuit (bus-down) will be disabled and the DTC concerning the system will be output from the multiplex network body ECU.
  
  Fig 1: Multiplex Communication System Diagram
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. If DTC indicating ECU communication stop is output, the connectors may be disconnected or the communication buses may be open at 2 points. Only 1 communication bus open will not set DTC.
  
  Fig 2: Identifying ECU DTC Output Circuit
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
3. If 2 communication buses are open at the positions as shown in the illustration, DTC indicating ECU communication stop between those 2 buses is output.
  
  Fig 3: Identifying ECU Communication Buses Positions
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002