CAN COMMUNICATION SYSTEM(for LHD) SYSTEM DESCRIPTION


  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 CAN 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 V bus, steering bus, braking and driving bus, parking assist bus, MS bus, WIL bus, powertrain bus and sensor 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. Skid control ECU assembly

    3. Main body ECU (driver side junction block)

    4. No. 1 meter ECU sub-assembly

    5. Telematics transceiver*13

    6. Electric power control ECU (passenger side junction block)

    7. Multi-media module receiver assembly

    8. Air conditioning amplifier assembly

    9. Headlight swivel ECU assembly

    10. Center airbag sensor assembly

    11. Driving support ECU assembly*1

    12. Steering angle sensor

    13. Yaw rate sensor

    14. Seat belt control ECU*1

    15. Steering control ECU*2

    16. Suspension control ECU*3

    17. Power steering ECU assembly

    18. Parking brake ECU assembly

    19. Clearance warning ECU assembly

    20. Blind spot monitor sensor LH*4

    21. Blind spot monitor sensor RH*4

    22. Front multiplex network light ECU (front controller)

    23. Front power seat switch LH

    24. Front power seat switch RH

    25. Front multiplex network door ECU LH

    26. Front multiplex network door ECU RH

    27. Rear multiplex network door ECU LH

    28. Rear multiplex network door ECU RH

    29. Certification ECU (smart key ECU assembly)

    30. Option connector (bus buffer ECU)*5

    31. Tire pressure warning receiver assembly*6

    32. Steering pad switch assembly (steering pad ECU)

    33. Multiplex tilt and telescopic ECU

    34. Outer mirror control ECU assembly

    35. Windshield wiper ECU assembly

    36. Power trunk lid control ECU (luggage closer motor assembly)

    37. Rear power seat switch*7

    38. Luggage room junction block assembly (rear junction block ECU)

    39. Millimeter wave radar sensor assembly*1

    40. Driver monitor ECU assembly*8

    41. Object recognition ECU*9

    42. No. 1 night view ECU*10

    43. Rear millimeter wave radar sensor*11

    44. Network gateway ECU*11

    45. Active headrest control ECU LH (front seat headrest assembly LH)*11

    46. Active headrest control ECU RH (front seat headrest assembly RH)*12

    47. TCM


      • *1: w/ Pre-crash Safety System

      • *2: w/ Variable Gear Ratio Steering System

      • *3: w/ Air Suspension System

      • *4: w/ Blind Spot Monitor System

      • *5: w/ Bus Buffer ECU

      • *6: w/ Tire Pressure Warning System

      • *7: w/ Rear Power Seat Control System or Seat Heater System

      • *8: w/ Driver Monitor Camera

      • *9: w/ Lane-keeping Assist System

      • *10: w/ Night View System

      • *11: w/ Pre-crash Intelligent Headrest

      • *12: w/ Pre-crash Intelligent Headrest (for 5-Passenger with Ottoman)

      • *13: w/ Telematics Transceiver

  5. DIAGNOSTIC CODES FOR CAN COMMUNICATION SYSTEM


    1. DTCs for the CAN communication system are as follows: U0073, U0100, U0101, U0122, U0123, U0124, U0126, U0127, U0128, U0129, U0130, U0131, U0132, U0140, U0141, U0142, U0147, U0151, U0155, U0163, U0164, U0182, U0199, U0200, U0201, U0202, U0208, U0209, U0210, U0230, U0232, U0233, U0235, U0327, U1002, U1004, U1005, U1100, U1101, U1104, U1106, U1110, U1111, U1112, U1113, U1114, U1115, U1117, U1118, U1119, U1120, U1121, U1124, U1125, B2427, B2621, B2624, C2179 and C1AEF.

  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 intelligent tester.

    3. The CAN communication system cannot detect trouble in the branch line 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.

      Tech Tips

      Refer to "Terminals of ECU" Click here for bus line color or the connecting side of the connector.