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DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSLEXUS2006RX 400H AWD V6-3.3L (3MZ-FE) HYBRIDREPAIR AND DIAGNOSISPOWERTRAIN MANAGEMENTCOMPUTERS AND CONTROL SYSTEMSINFORMATION BUSDESCRIPTION AND OPERATIONSYSTEM DESCRIPTION
2006 Lexus RX 400h AWD V6-3.3L (3MZ-FE) Hybrid
System Description
2006 Lexus RX 400h AWD V6-3.3L (3MZ-FE) HybridSECTION System Description
SYSTEM DESCRIPTION
1. MULTIPLEX COMMUNICATION SYSTEM BASICS
a. The LEXUS RX400h Multiplex Communication System (MPX) uses serial communication, which converts multiple pieces of information into serial communication data. As a result, they can be transmitted through a single communication wire.
b. Serial communication data consists of bits and frames. A bit is a basic unit of information represented by the binary values "0" and "1". The amount of information is represented by the number of bits. A frames is a group of bits. A frame contains a "header" that indicates the beginning of the frame and an "end message" that indicates the end of the frame.
c. Based on serial communication, various ECUs are connected on a network to exchange various pieces of information. Such a system is called a multiplex communication system.
1. The BEAN uses a ring and bus style of network to connect ECUs. This style of communication method is called a daisy chain. In a daisy chain, communication can be maintained even if the network has an open circuit.
2. The AVC-LAN uses a star style, which is centered on the multi-display or audio head unit.
d. Difference of CAN, BEAN and AVC-LAN
1. The CAN, BEAN and AVC-LAN protocols have set guidelines for data. The guidelines include communication speed, type of communication wire, drive type and data length. These guidelines are established to facilitate ECU data communication.
2. A single, Automobile Vinyl (AV) wire is used for BEAN communication. A braided-pair wire is used for CAN and AVC-LAN communication.
2. NETWORK GATEWAY ECU
The network gateway ECU of the LEXUS RX400h has the following functions.
1. MULTIPLEX COMMUNICATION SYSTEM BASICS
a. The LEXUS RX400h Multiplex Communication System (MPX) uses serial communication, which converts multiple pieces of information into serial communication data. As a result, they can be transmitted through a single communication wire.
b. Serial communication data consists of bits and frames. A bit is a basic unit of information represented by the binary values "0" and "1". The amount of information is represented by the number of bits. A frames is a group of bits. A frame contains a "header" that indicates the beginning of the frame and an "end message" that indicates the end of the frame.
c. Based on serial communication, various ECUs are connected on a network to exchange various pieces of information. Such a system is called a multiplex communication system.
1. The BEAN uses a ring and bus style of network to connect ECUs. This style of communication method is called a daisy chain. In a daisy chain, communication can be maintained even if the network has an open circuit.
2. The AVC-LAN uses a star style, which is centered on the multi-display or audio head unit.
d. Difference of CAN, BEAN and AVC-LAN
1. The CAN, BEAN and AVC-LAN protocols have set guidelines for data. The guidelines include communication speed, type of communication wire, drive type and data length. These guidelines are established to facilitate ECU data communication.
2. A single, Automobile Vinyl (AV) wire is used for BEAN communication. A braided-pair wire is used for CAN and AVC-LAN communication.
2. NETWORK GATEWAY ECU
The network gateway ECU of the LEXUS RX400h has the following functions.
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.