CAN COMMUNICATION SYSTEM CAN Bus Line

DESCRIPTION

Measure the resistance from the DLC3 before checking the CAN bus wires to troubleshoot the CAN communication system.

WIRING DIAGRAM

B007TTBE01
B007VLRE01

INSPECTION PROCEDURE

Tech Tips

Operating the ignition switch, any switches or any doors triggers related ECU and sensor communication with the CAN, which causes resistance variation.

PROCEDURE


  1. DISCONNECT CABLE FROM NEGATIVE BATTERY TERMINAL


    1. Disconnect the cable from the negative (-) battery terminal before measuring the resistances of the CAN main wire and the CAN branch wire.

      CAUTION:

      For vehicles with an airbag system:

      Wait at least 90 seconds after disconnecting the cable from the negative (-) battery terminal to disable the SRS system.

      Note

      When disconnecting the cable, some systems need to be initialized after the cable is reconnected Click here.


    NEXT

  2. CHECK FOR OPEN CIRCUIT IN DLC3 BRANCH WIRE AND V1 BUS CIRCUIT CAN MAIN WIRE AND SHORT CIRCUIT (CANH - CANL)


    1. B007UGYE35
      Text in Illustration
      *a Front view of DLC3

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

      Standard Resistance
      Tester Connection Switch Condition Specified Value Result
      H23-6 (CANH) - H23-14 (CANL) Ignition switch off OK (54 to 69 Ω) A
      H23-6 (CANH) - H23-14 (CANL) Ignition switch off NG (Higher than 70 Ω) B
      H23-6 (CANH) - H23-14 (CANL) Ignition switch off NG (Below 53 Ω) C

    B

    GO TO OPEN IN CAN MAIN BUS LINE Click here

    C

    GO TO SHORT IN CAN BUS LINES Click here

    A

  3. CHECK FOR SHORT TO B+ IN CAN V1 BUS (CANH, CANL - BAT)


    1. B007UGYE36
      Text in Illustration
      *a Front view of DLC3

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

      Standard Resistance
      Tester Connection Switch Condition Specified Value
      H23-6 (CANH) - H23-16 (BAT) Ignition switch off 6 kΩ or higher
      H23-14 (CANL) - H23-16 (BAT) Ignition switch off 6 kΩ or higher

    NG

    GO TO SHORT TO B+ IN CAN BUS LINE Click here

    OK

  4. CHECK FOR SHORT TO GND IN CAN V1 BUS (CANH, CANL - CG)


    1. B007UGYE37
      Text in Illustration
      *a Front view of DLC3

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

      Standard Resistance
      Tester Connection Switch Condition Specified Value
      H23-6 (CANH) - H23-4 (CG) Ignition switch off 200 Ω or higher
      H23-14 (CANL) - H23-4 (CG) Ignition switch off 200 Ω or higher

    NG

    GO TO SHORT TO GND IN CAN BUS LINE Click here

    OK

    GO TO HOW TO PROCEED WITH TROUBLESHOOTING Click here