Click here

CAN COMMUNICATION SYSTEM Check CAN Bus Line for Short to +B (LHD Models)

Click here
Click here
DTC Code DTC Name
  Check CAN Bus Line for Short to +B (LHD Models)
Click here

DESCRIPTION

There may be a short circuit between the CAN bus line and +B when no resistance exists between terminals 6 (CANH) and 16 (BAT) or terminals 14 (CANL) and 16 (BAT) of the DLC3.

Symptom Trouble Area
No resistance exists between terminals 6 (CANH) and 16 (BAT) or terminals 14 (CANL) and 16 (BAT) of the DLC3.

  • Short to +B in CAN bus wire

  • Skid control ECU

  • Power steering ECU

  • Steering angle sensor

  • Yaw rate sensor

  • ECM

  • Center airbag sensor assembly

  • Air conditioning amplifier

  • Combination meter ECU

  • Main body ECU

  • Television camera ECU

  • CAN junction connector CTR

  • CAN junction connector RH
A017BDBE03
Click here

WIRING DIAGRAM

Click here

INSPECTION PROCEDURE

Note:

  • Turn the ignition switch off before measuring the resistances of the CAN main wire and the CAN branch wire.

  • After the ignition switch is turned off, check that the key reminder warning system and light reminder warning system are not in operation.

  • Before measuring the resistance, leave the vehicle as is for at least 1 minute and do not operate the ignition switch, any other switches or the doors. If the doors need to be opened in order to check the connectors, open the doors and leave them open.

Tip:

  • Operating the ignition switch, any other switches, or a door triggers related ECU and sensor communication on the CAN. This communication will cause the resistance value to change.

  • Even after DTCs are cleared, if a DTC is stored again after driving the vehicle for a while, the malfunction may be occurring due to vibration of the vehicle. In such a case, wiggling the ECUs or wire harness while performing the inspection below will help determine the cause of the malfunction.

Click here

PROCEDURE


  1. Click here

    CHECK FOR SHORT TO B+ IN CAN BUS WIRE (CAN JUNCTION CONNECTOR CTR)


    1. Turn the ignition switch off, and disconnect negative battery terminal.

    2. Disconnect the CAN junction connector CTR.

    3. A017BAHE12

      Measure the resistance according to the value(s) in the table below.

      Standard resistance
      Tester Connection Wiring Color Connect to Condition Specified Condition
      D47-1 (CANH) - D43-16 (BAT) SB - LG CAN junction connector RH Disconnect negative battery terminal 6 kΩ or higher
      D47-12 (CANL) - D43-16 (BAT) W - LG CAN junction connector RH Disconnect negative battery terminal 6 kΩ or higher
      D47-4 (CANH) - D43-16 (BAT) L - LG DLC3 Disconnect negative battery terminal 6 kΩ or higher
      D47-15 (CANL) - D43-16 (BAT) W - LG DLC3 Disconnect negative battery terminal 6 kΩ or higher
      D47-6 (CANH) - D43-16 (BAT) P - LG Combination meter Disconnect negative battery terminal 6 kΩ or higher
      D47-17 (CANL) - D43-16 (BAT) W - LG Combination meter Disconnect negative battery terminal 6 kΩ or higher
      Result
      Result Proceed to
      OK A
      NG (DLC3 branch wire) B
      NG (Combination meter main wire) C
      NG (CAN junction connector RH main wire) D

  2. Click here

    CHECK FOR SHORT TO B+ IN CAN BUS WIRE (CAN JUNCTION CONNECTOR CTR)


    1. A017BAHE13

      Measure the resistance according to the value(s) in the table below.

      Standard resistance
      Tester Connection Wiring Color Connect to Condition Specified Condition
      D47-2 (CANH) - D43-16 (BAT) V - LG Yaw rate sensor Disconnect negative battery terminal 6 kΩ or higher
      D47-13 (CANL) - D43-16 (BAT) W - LG Yaw rate sensor Disconnect negative battery terminal 6 kΩ or higher
      D47-3 (CANH) - D43-16 (BAT) Y - LG Center airbag sensor assembly Disconnect negative battery terminal 6 kΩ or higher
      D47-14 (CANL) - D43-16 (BAT) W - LG Center airbag sensor assembly Disconnect negative battery terminal 6 kΩ or higher
      D47-5 (CANH) - D43-16 (BAT) R - LG Steering angle sensor Disconnect negative battery terminal 6 kΩ or higher
      D47-16 (CANL) - D43-16 (BAT) W - LG Steering angle sensor Disconnect negative battery terminal 6 kΩ or higher
      Result
      Result Proceed to
      OK A
      NG (Yaw rate sensor branch wire) B
      NG (Center airbag sensor assembly branch wire) C
      NG (Steering angle sensor branch wire) D

  3. Click here

    CHECK FOR SHORT TO B+ IN CAN BUS WIRE (CAN JUNCTION CONNECTOR CTR)


    1. A017BAHE14

      Measure the resistance according to the value(s) in the table below.

      Standard resistance
      Tester Connection Wiring Color Connect to Condition Specified Condition
      D47-7 (CANH) - D43-16 (BAT) BR - LG Power steering ECU Disconnect negative battery terminal 6 kΩ or higher
      D47-18 (CANL) - D43-16 (BAT) W - LG Power steering ECU Disconnect negative battery terminal 6 kΩ or higher
      D47-8 (CANH) - D43-16 (BAT) GR - LG Main body ECU Disconnect negative battery terminal 6 kΩ or higher
      D47-19 (CANL) - D43-16 (BAT) W - LG Main body ECU Disconnect negative battery terminal 6 kΩ or higher
      D47-9 (CANH) - D43-16 (BAT) SB - LG Television camera ECU Disconnect negative battery terminal 6 kΩ or higher
      D47-20 (CANL) - D43-16 (BAT) W - LG Television camera ECU Disconnect negative battery terminal 6 kΩ or higher
      Result
      Result Proceed to
      OK A
      NG (Power steering ECU branch wire) B
      NG (Main body ECU branch wire) C
      NG (Television camera ECU branch wire) D

  4. Click here

    REPLACE CAN JUNCTION CONNECTOR CTR

  5. Click here

    CHECK FOR SHORT TO B+ IN CAN BUS WIRE (COMBINATION METER MAIN WIRE)


    1. A017BD2E21

      Disconnect the combination meter connector.

    2. A017E4AE04

      Measure the resistance according to the value(s) in the table below.

      Standard resistance
      Tester Connection Condition Specified Condition
      D47-6 (CANH) - D43-16 (BAT) Disconnect negative battery terminal 6 kΩ or higher
      D47-17 (CANL) - D43-16 (BAT) Disconnect negative battery terminal 6 kΩ or higher

  6. Click here

    REPLACE COMBINATION METERClick here

  7. Click here

    REPAIR OR REPLACE CAN MAIN WIRE OR CONNECTOR (COMBINATION METER MAIN WIRE)

  8. Click here

    CHECK FOR SHORT TO B+ IN CAN BUS WIRE (CAN JUNCTION CONNECTOR RH)


    1. Disconnect the CAN junction connector RH.

    2. A017BAHE15

      Measure the resistance according to the value(s) in the table below.

      Tip:

      The resistance must be measured after the CAN junction connector CTR is disconnected.

      Standard resistance
      Tester Connection Wiring Color Connect to Condition Specified Condition
      D51-1 (CANH) - D43-16 (BAT) R - LG ECM Disconnect negative battery terminal 6 kΩ or higher
      D51-12 (CANL) - D43-16 (BAT) W - LG ECM Disconnect negative battery terminal 6 kΩ or higher
      D51-5 (CANH) - D43-16 (BAT) SB - LG CAN junction connector CTR Disconnect negative battery terminal 6 kΩ or higher
      D51-16 (CANL) - D43-16 (BAT) W - LG CAN junction connector CTR Disconnect negative battery terminal 6 kΩ or higher
      Result
      Result Proceed to
      OK A
      NG (ECM main wire) B
      NG (CAN junction connector CTR main wire) C

  9. Click here

    CHECK FOR SHORT TO B+ IN CAN BUS WIRE (CAN JUNCTION CONNECTOR RH)


    1. A017BYME01

      Measure the resistance according to the value(s) in the table below.

      Standard resistance
      Tester Connection Wiring Color Connect to Condition Specified Condition
      D51-3 (CANH) - D43-16 (BAT) LG - LG Air conditioning amplifier Disconnect negative battery terminal 6 kΩ or higher
      D51-14 (CANL) - D43-16 (BAT) W - LG Air conditioning amplifier Disconnect negative battery terminal 6 kΩ or higher
      D51-4 (CANH) - D43-16 (BAT) B - LG Skid control ECU Disconnect negative battery terminal 6 kΩ or higher
      D51-15 (CANL) - D43-16 (BAT) W - LG Skid control ECU Disconnect negative battery terminal 6 kΩ or higher
      Result
      Result Proceed to
      OK A
      NG (Air conditioning amplifier branch wire) B
      NG (Skid control ECU branch wire) C

  10. Click here

    REPLACE CAN JUNCTION CONNECTOR RH

  11. Click here

    CHECK FOR SHORT TO B+ IN CAN BUS WIRE (ECM MAIN WIRE)


    1. A017EELE04

      Disconnect the ECM connector.

    2. A017E4AE05

      Measure the resistance according to the value(s) in the table below.

      Standard resistance
      Tester Connection Condition Specified Condition
      D51-1 (CANH) - D43-16 (BAT) Disconnect negative battery terminal 6 kΩ or higher
      D51-12 (CANL) - D43-16 (BAT) Disconnect negative battery terminal 6 kΩ or higher

  12. Click here

    REPLACE ECMClick here

  13. Click here

    REPAIR OR REPLACE CAN MAIN WIRE OR CONNECTOR (ECM MAIN WIRE)

  14. Click here

    REPAIR OR REPLACE CAN BRANCH WIRE CONNECTED TO DLC3

  15. Click here

    REPAIR OR REPLACE CAN MAIN WIRE OR CONNECTOR (CAN JUNCTION CONNECTOR CTR - CAN JUNCTION CONNECTOR RH)

  16. Click here

    CHECK FOR SHORT TO B+ IN CAN BUS WIRE (YAW RATE SENSOR BRANCH WIRE)


    1. A017DEAE04

      Disconnect the yaw rate sensor connector.

    2. A017E4AE06

      Measure the resistance according to the value(s) in the table below.

      Standard resistance
      Tester Connection Condition Specified Condition
      D47-2 (CANH) - D43-16 (BAT) Disconnect negative battery terminal 6 kΩ or higher
      D47-13 (CANL) - D43-16 (BAT) Disconnect negative battery terminal 6 kΩ or higher

  17. Click here

    REPLACE YAW RATE SENSORClick here

  18. Click here

    REPAIR OR REPLACE CAN BUS BRANCH WIRE OR CONNECTOR (YAW RATE SENSOR BRANCH WIRE)

  19. Click here

    CHECK FOR SHORT TO B+ IN CAN BUS WIRE (CENTER AIRBAG SENSOR ASSEMBLY BRANCH WIRE)


    1. A017DMZE22

      Disconnect the center airbag sensor assembly connector.

    2. A017E4AE07

      Measure the resistance according to the value(s) in the table below.

      Standard resistance
      Tester Connection Condition Specified Condition
      D47-3 (CANH) - D43-16 (BAT) Disconnect negative battery terminal 6 kΩ or higher
      D47-14 (CANL) - D43-16 (BAT) Disconnect negative battery terminal 6 kΩ or higher

  20. Click here

    REPLACE CENTER AIRBAG SENSOR ASSEMBLYClick here

  21. Click here

    REPAIR OR REPLACE CAN BUS BRANCH WIRE OR CONNECTOR (CENTER AIRBAG SENSOR ASSEMBLY BRANCH WIRE)

  22. Click here

    CHECK FOR SHORT TO B+ IN CAN BUS WIRE (STEERING ANGLE SENSOR BRANCH WIRE)


    1. A017FNVE03

      Disconnect the steering angle sensor connector.

    2. A017E4AE08

      Measure the resistance according to the value(s) in the table below.

      Standard resistance
      Tester Connection Condition Specified Condition
      D47-5 (CANH) - D43-16 (BAT) Disconnect negative battery terminal 6 kΩ or higher
      D47-16 (CANL) - D43-16 (BAT) Disconnect negative battery terminal 6 kΩ or higher

  23. Click here

    REPLACE STEERING ANGLE SENSORClick here

  24. Click here

    REPAIR OR REPLACE CAN BUS BRANCH WIRE OR CONNECTOR (STEERING ANGLE SENSOR BRANCH WIRE)

  25. Click here

    CHECK FOR SHORT TO B+ IN CAN BUS WIRE (POWER STEERING ECU BRANCH WIRE)


    1. A017BE3E11

      Disconnect the power steering ECU connector.

    2. A017E4AE09

      Measure the resistance according to the value(s) in the table below.

      Standard resistance
      Tester Connection Condition Specified Condition
      D47-7 (CANH) - D43-16 (BAT) Disconnect negative battery terminal 6 kΩ or higher
      D47-18 (CANL) - D43-16 (BAT) Disconnect negative battery terminal 6 kΩ or higher

  26. Click here

    REPLACE POWER STEERING ECUClick here

  27. Click here

    REPAIR OR REPLACE CAN BUS BRANCH WIRE OR CONNECTOR (POWER STEERING ECU BRANCH WIRE)

  28. Click here

    CHECK FOR SHORT TO B+ IN CAN BUS WIRE (MAIN BODY ECU BRANCH WIRE)


    1. A017F33E05

      Disconnect the main body ECU connector.

    2. A017E4AE10

      Measure the resistance according to the value(s) in the table below.

      Standard resistance
      Tester Connection Condition Specified Condition
      D47-8 (CANH) - D43-16 (BAT) Disconnect negative battery terminal 6 kΩ or higher
      D47-19 (CANL) - D43-16 (BAT) Disconnect negative battery terminal 6 kΩ or higher

  29. Click here

    REPLACE MAIN BODY ECU

  30. Click here

    REPAIR OR REPLACE CAN BUS BRANCH WIRE OR CONNECTOR (MAIN BODY ECU BRANCH WIRE)

  31. Click here

    CHECK FOR SHORT TO B+ IN CAN BUS WIRE (TELEVISION CAMERA ECU BRANCH WIRE)


    1. A017CLDE01

      Disconnect the television camera ECU connector.

    2. A017E4AE13

      Measure the resistance according to the value(s) in the table below.

      Standard resistance
      Tester Connection Condition Specified Condition
      D47-9 (CANH) - D43-16 (BAT) Disconnect negative battery terminal 6 kΩ or higher
      D47-20 (CANL) - D43-16 (BAT) Disconnect negative battery terminal 6 kΩ or higher

  32. Click here

    REPLACE PARKING ASSIST ECU (TELEVISION CAMERA ECU)

  33. Click here

    REPAIR OR REPLACE CAN BUS BRANCH WIRE OR CONNECTOR (TELEVISION CAMERA ECU BRANCH WIRE)

  34. Click here

    CHECK FOR SHORT TO B+ IN CAN BUS WIRE (AIR CONDITIONING AMPLIFIER BRANCH WIRE)


    1. A017FS6E06

      Disconnect the air conditioning amplifier connector.

    2. A017E4AE11

      Measure the resistance according to the value(s) in the table below.

      Standard resistance
      Tester Connection Condition Specified Condition
      D51-3 (CANH) - D47-16 (BAT) Disconnect negative battery terminal 6 kΩ or higher
      D51-14 (CANL) - D47-16 (BAT) Disconnect negative battery terminal 6 kΩ or higher

  35. Click here

    REPLACE AIR CONDITIONING AMPLIFIERClick here

  36. Click here

    REPAIR OR REPLACE CAN BUS BRANCH WIRE OR CONNECTOR (AIR CONDITIONING AMPLIFIER BRANCH WIRE)

  37. Click here

    CHECK FOR SHORT TO B+ IN CAN BUS WIRE (SKID CONTROL ECU BRANCH WIRE)


    1. A017C50E48

      Disconnect the skid control ECU connector.

    2. A017E4AE12

      Measure the resistance according to the value(s) in the table below.

      Standard resistance
      Tester Connection Condition Specified Condition
      D51-4 (CANH) - D47-16 (BAT) Disconnect negative battery terminal 6 kΩ or higher
      D51-15 (CANL) - D47-16 (BAT) Disconnect negative battery terminal 6 kΩ or higher

  38. Click here

    REPLACE BRAKE ACTUATOR ASSEMBLYClick here

  39. Click here

    REPAIR OR REPLACE CAN BUS BRANCH WIRE OR CONNECTOR (SKID CONTROL ECU BRANCH WIRE)