BODY ELECTRICAL MULTIPLEX COMMUNICATION SYSTEM DESCRIPTION. 1. System Outline BE-2 BODY ELECTRICAL MULTIPLEX COMMUNICATION SYSTEM.
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1 BE-2 BODY ELECTRICAL MULTIPLEX COMMUNICATION SYSTEM DESCRIPTION 1. System Outline General A multiplex communication system establishes serial data communication by connecting the s on a single communication line in order to exchange multiple pieces of information. The adoption of a multiplex communication system significantly reduces the number of wiring harnesses as well as the number of sensors. The types of multiplex communication systems are the (Body Electronics Area Network), which consists primarily of the s that control the body systems, and the AVC-LAN (Audio Visual Communication - Local Area Network), which consists of the s that control the audio and visual systems. Conceptual Drawing of Multiplex Communication System Shift Position Fuel Injection Volume Shift Position Fuel Injection Volume Water Temp. Sensor Water Temp. Sensor A/C Engine Meter Ambient Temp. Sensor 199BE01 Ambient Temp. Sensor 199BE02 Multiplex Communication System Conventional System
2 BE-3 Daisy Chain The s that comprise the are connected serially to form a ring. This type of connection method is called a daisy chain. The s are connected by a communication line, and multiple pieces of information are transmitted and received by the s by slightly staggering their times. Communication Line Communication Line Data Data 199BE71 199BE69 Communication Frame The s in the exchange data in the form of individual clusters called communication frames, which are configured as described in the diagram below. Header Priority Data Length Response of Receiver End Message Communication Line Voltage Hi (12 V) Lo (0 V) Address for Error Rcceiver Data Type Data Detection Code Sending is Completed Communication Frame 199BE70
3 BE-4 2. General The basic construction and function of the multiplex communication system on the SC430 are the same as on the LS430. The consists of three buses (bus : A single cluster of daisy chain): a) Door bus b) Instrument panel bus c) Steering column bus The gateway connects the buses, the AVC-LAN, and the DLC3 (Data Link Connector 3), and manages the communication among them. The communication between the control signals related to the audio and visual systems and the Gateway is established via the AVC-LAN. A customized body electronics system has been adopted. To protect the lighting operations and wiper operations in case the communication is disrupted due to a malfunction, a backup bus and fail-safe line is provided. (Door Bus) (Instrument Panel Bus) (Steering Column Bus) : : AVC-LAN : Communication Line for Diagnosis Gateway AVC-LAN DLC3 202BE002 Specifications Item SC430 LS430 Connected s * Communication Frame * Gateway x Diagnosis Gateway Function x AVC-LAN Gateway in charge of vehicle information of the customized body electronics system Troubleshooting the multiplex communication system Gateway The DTCs (Diagnostic Trouble Codes) of the Gateway are checked on the LEXUS hand-held tester Communication Speed 10 kbps * 3 * 1 : Optional s are also included. * 2 : A group of data that is required for a single instance of communication. * 3 : A unit of data transmission per second (bit per second).
4 BE-5 3. System Diagram Entire System DLC3 Passenger Side J/B Airbag Sensor Assembly Skid Control Engine Driver Door Passenger Door Driver Seat Front Passenger Seat Tire Pressure Monitor Receiver* 2 Meter Air Conditioner Theft Deterrent Transponder Key Sliding Roof Control (Door Bus) (Instrument Panel Bus) Stereo Component Amplifier Navigation * 1 Gateway Driver Side J/B Luggage Room J/B Tilt and Telescopic AVC-LAN Radio and Player Navigation Display* 1 Combination Switch Steering Pad Switch Front Controller (Steering Column Bus) * 1 : with LEXUS Navigation System * 2 : Only for European Model 199BE04
5 BE-6 Door Bus To Instrument Panel Bus To Steering Column Bus Gateway Passenger Door (LHD) Driver Door (RHD) MPD2 MPD1 Transponder Key Sliding Roof Control MPX Theft Deterrent Front Passenger Seat (LHD) Driver Seat (RHD) Driver Seat (LHD) Front Passenger Seat (RHD) Driver Door (LHD) Passenger Door (RHD) 199BE05 Instrument Panel Bus To Steering Column Bus To Door Bus Gateway Meter MPX MPX+ MPI2 MPI1 Tire Pressure Monitor Receiver* Skid Control MPX Air Conditioner MPX+ Airbag Sensor Assembly AIRBAG MPX Passenger Side J/B Engine 199BE05 *: Only for European Model
6 BE-7 Steering Column Bus To Door Bus To Instrument Panel Bus Gateway MPL2 MPL1 Front Controller MPX3 MPX Steering Pad Switch MPX Luggage Room J/B MPX+ Driver Side J/B Tilt and Telescopic Combination Switch 199BE06 AVC-LAN To Instrument Panel Bus To Door Bus To Steering Column Bus Gateway Navigation * GTX GTX+ TX TX+ Navigation Display* TX+ TX TXS TXS+ TXD TXD+ ATX+ TX+ TX+ ATX Radio and Player TX TX Stereo Component Amplifier *: with LEXUS Navigation System 199BE07
7 BE-8 4. Layout of Component Door Bus Transponder Key Gateway Theft Deterrent 199BE81 Passenger Door Driver Door Front Passenger Seat Sliding Roof Control Driver Seat for LHD Model 199BE82
8 BE-9 Instrument Panel Bus Skid Control Combination Meter Meter Air Conditioner Gateway Passenger Side J/B Engine Tire Pressure Monitor Receiver* Airbag Sensor Assembly 199BE83 *: Only for European Model 199BE84 for LHD Model
9 BE-10 Steering Column Bus Combination Switch Gateway Tilt and Telescopic Steering Pad Switch 199BE85 Driver Side J/B Luggage Room J/B Front Controller 199BE86 for LHD Model
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