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Home >> Lexus >> 2019 >> GX 460 Base >> Repair and Diagnosis (Single Page) >> Accessories & Equipment >> Communication Devices >> Can Communication System (Diagnostics - Introduction) (1 Of 5) >> Can Communication System >> System Description [08/2015 - 08/2019] >> System Description [08/2015 - 08/2019]
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System Description [08/2015 - 08/2019]

  1. BRIEF DESCRIPTION 
    1. The CAN (Controller Area Network) is a serial data communication system for real-time application. It is a vehicle multiplex communication system which has a high communication speed (500 kbps, 250 kbps) and the ability to detect malfunctions.
    2. By pairing the CANH and CANL bus lines, the CAN performs communication based on differential voltages.
    3. Many ECUs (sensors) installed on the vehicle operate by sharing information and communicating with each other.
    4. The CAN has 2 resistors of 120 Ω which are necessary to communicate using the main wire.
  2. DEFINITION OF TERMS 
    1. CAN main wire
      1. The CAN main wire is a wire harness between the 2 termination circuits on the bus (communication line). This is the main bus in the CAN communication system.
    2. CAN branch wire
      1. The CAN branch wire is a wire harness which diverges from the main wire to an ECU or sensor.
    3. Termination circuits
      1. The termination circuit is a circuit which converts the communication current of the CAN communication into the bus voltage. It consists of a resistor and capacitor. 2 termination circuits are necessary on a bus.
    4. CAN junction connector
      1. The CAN junction connector is designed so that it can be used with CAN communication which has a termination circuit and CAN communication which does not have a termination circuit.
  3. CIRCUIT DESCRIPTION 
    1. The V1 bus, V2 bus, MS bus, power management bus, sensor bus and local bus each have termination circuits with a resistance of 120 Ω x 2. High speed communication at 500 kbps and 250 kbps is possible.
  4. ECUS OR SENSORS WHICH COMMUNICATE VIA CAN COMMUNICATION SYSTEM 
    1. ECM
    2. Power management control ECU
    3. Main body ECU (multiplex network body ECU)
    4. Master cylinder solenoid (skid control ECU)
    5. Four wheel drive control ECU
    6. Yaw rate sensor assembly
    7. DLC3
    8. Spiral with sensor cable sub-assembly (steering angle sensor)
    9. Multi-media module receiver assembly
    10. DCM (telematics transceiver)*1
    11. Certification ECU (smart key ECU assembly)
    12. Center airbag sensor assembly
    13. Combination meter assembly
    14. Air conditioning amplifier assembly
    15. Headlight swivel ECU assembly
    16. Seat belt control ECU*2
    17. Driving support ECU assembly*2
    18. Stabilizer control ECU
    19. Suspension control ECU*3
    20. Parking assist ECU*4
    21. Clearance warning ECU assembly*5
    22. Blind spot monitor sensor LH*6
    23. Blind spot monitor sensor RH*6
    24. Front power seat switch LH
    25. Multiplex tilt and telescopic ECU
    26. Driving support switch control ECU
    27. Driver monitor ECU assembly*7
    28. Lane recognition camera sensor assembly*8
    29. Millimeter wave radar sensor assembly*2
      1. *1: w/ Manual (SOS) Switch
      2. *2: w/ Pre-collision System
      3. *3: w/ Air Suspension System
      4. *4: w/ Side Monitor System
      5. *5: w/ Intuitive Parking Assist System
      6. *6: w/ Blind Spot Monitor System
      7. *7: w/ Driver Monitor Camera
      8. *8: w/ Lane Departure Alert System
  5. DIAGNOSTIC CODES FOR CAN COMMUNICATION SYSTEM 
    1. DTCs for the CAN communication system are as follows: U0073, U0100, U0101, U0104, U0114, U0122, U0123, U0124, U0126, U0129, U0132, U0139, U0140, U0142, U0151, U0155, U0163, U0164, U0182, U0198, U0199, U0200, U0208, U0232, U0233, U0235, U0327, U1002, U1100, U110B, U1102, U1104, U1110, U1114, U1115, U1119, U1121, U1133, B15F5, B15F6, B15F7, B15F8, B2621, B2624 and B2779.
  6. NOTES REGARDING TROUBLESHOOTING 
    1. Trouble in the CAN bus (communication line) can be checked through the DLC3 (except when there is a wire break in the CAN branch wire of the DLC3).
    2. DTCs regarding the CAN communication system can be checked using the Techstream.
    3. The CAN communication system cannot detect trouble in the CAN branch wire of the DLC3 even though the DLC3 is also connected to the CAN communication system.
  7. HOW TO DISTINGUISH CAN JUNCTION CONNECTOR CONNECTORS 
    1. In the CAN communication system, the shape of all connectors connected to the CAN junction connector is the same.

      The connectors connected to the CAN junction connector can be distinguished by the colors of the bus line and the connecting side of the connector.

      HINT: 

      See "Terminals of ECU" (Refer to TERMINALS OF ECU [08/2015 - 08/2019] ) for bus line color or the type of connecting surface.

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