CAN COMMUNICATION SYSTEM Open in CAN Main Wire

DESCRIPTION

There may be an open circuit in the CAN main wire and/or DLC3 branch wire when the resistance between terminals 6 (CANH) and 14 (CANL) of the DLC3 is 69 Ω or higher.

Symptom Trouble Area
The resistance between terminals 6 (CANH) and 14 (CANL) of the DLC3 is 69 Ω or higher.

  • CAN main wire and connector

  • No. 1 junction connector

  • No. 2 junction connector

  • No. 3 junction connector

  • No. 4 junction connector

  • ECM

  • Combination meter assembly

  • DLC3 branch wire or connector

WIRING DIAGRAM

A003DNHE01

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 main wire and the branch wire.

      CAUTION:

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

      Note


      • w/ Navigation System (for HDD):

        After the ignition switch is turned off, the HDD navigation system requires approximately a minute to record various types of memory and settings. As a result, after turning the ignition switch off, wait a minute or more before disconnecting the cable from the negative (-) battery terminal.

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


    NEXT

  2. CHECK DLC3


    1. Disconnect the D90 No. 3 junction connector connector.

    2. A003E5PE36
      Text in Illustration
      *1 Front view of DLC3

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

      Result
      Tester Connection Switch Condition Measured Resistance Proceed to
      D8-6 (CANH) - D8-14 (CANL) Ignition switch off 108 to 132 Ω OK
      D8-6 (CANH) - D8-14 (CANL) Ignition switch off 132 Ω or higher NG

      Note

      When the measured value is 132 Ω or higher and a CAN communication system diagnostic trouble code is output, there may be a fault besides disconnection of the DLC3 branch wire. For that reason, troubleshooting should be performed again from "How to Proceed with Troubleshooting" Click here after repairing the trouble area.


    NG

    REPAIR OR REPLACE CAN BRANCH WIRE CONNECTED TO DLC3 (CANH, CANL)

    OK

  3. CHECK FOR OPEN IN CAN BUS MAIN WIRE (NO. 3 JUNCTION CONNECTOR - ECM)


    1. A003BZOE15
      Text in Illustration
      *1

      Rear view of wire harness connector

      (to No. 3 Junction Connector)

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

      Standard Resistance
      Tester Connection Switch Condition Specified Condition
      D90-10 (CANH) - D90-21 (CANL) Ignition switch off 108 to 132 Ω

    NG

    CONNECT CONNECTOR Click here

    OK

  4. CHECK FOR OPEN IN CAN BUS MAIN WIRE (NO. 3 JUNCTION CONNECTOR - COMBINATION METER)


    1. A003BZOE14
      Text in Illustration
      *1

      Rear view of wire harness connector

      (to No. 3 Junction Connector)

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

      Standard Resistance
      Tester Connection Switch Condition Specified Condition
      D90-1 (CANH) - D90-12 (CANL) Ignition switch off 108 to 132 Ω

    NG

    CONNECT CONNECTOR Click here

    OK

    REPLACE NO. 3 JUNCTION CONNECTOR

  5. CONNECT CONNECTOR


    1. Reconnect the D90 No. 3 junction connector connector.


    NEXT

  6. CHECK FOR OPEN IN CAN BUS MAIN WIRE (NO. 2 JUNCTION CONNECTOR - ECM)


    1. A003BZOE16
      Text in Illustration
      *1

      Rear view of wire harness connector

      (to No. 2 Junction Connector)

      Disconnect the G39 No. 2 junction connector connector.

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

      Standard Resistance
      Tester Connection Switch Condition Specified Condition
      G39-1 (CANH) - G39-12 (CANL) Ignition switch off 108 to 132 Ω

    NG

    CONNECT CONNECTOR Click here

    OK

  7. CHECK FOR OPEN IN CAN BUS MAIN WIRE (NO. 2 JUNCTION CONNECTOR - NO. 3 JUNCTION CONNECTOR)

    A003BZOE17
    Text in Illustration
    *1

    Rear view of wire harness connector

    (to No. 2 Junction Connector)

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

      Standard Resistance
      Tester Connection Switch Condition Specified Condition
      G39-2 (CANH) - G39-13 (CANL) Ignition switch off 108 to 132 Ω

    NG

    REPAIR OR REPLACE CAN MAIN WIRE OR CONNECTOR (NO. 2 JUNCTION CONNECTOR - NO. 3 JUNCTION CONNECTOR)

    OK

    REPLACE NO. 2 JUNCTION CONNECTOR

  8. CONNECT CONNECTOR


    1. Reconnect the G39 No. 2 junction connector connector.


    NEXT

  9. CHECK FOR OPEN IN CAN BUS WIRE (NO. 1 JUNCTION CONNECTOR - ECM)


    1. A003BZOE19
      Text in Illustration
      *1

      Rear view of wire harness connector

      (to No. 1 Junction Connector)

      Disconnect the A39 No. 1 junction connector connector.

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

      Standard Resistance
      Tester Connection Switch Condition Specified Condition
      A39-10 (CANH) - A39-21 (CANL) Ignition switch off 108 to 132 Ω

    NG

    CONNECT CONNECTOR Click here

    OK

  10. CHECK OPEN IN CAN BUS WIRE (NO. 1 JUNCTION CONNECTOR - NO. 2 JUNCTION CONNECTOR)

    A003BZOE18
    Text in Illustration
    *1

    Rear view of wire harness connector

    (to No. 1 Junction Connector)

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

      Standard Resistance
      Tester Connection Switch Condition Specified Condition
      A39-9 (CANH) - A39-20 (CANL) Ignition switch off 108 to 132 Ω

    NG

    REPAIR OR REPLACE CAN MAIN WIRE OR CONNECTOR (NO. 1 JUNCTION CONNECTOR - NO. 2 JUNCTION CONNECTOR)

    OK

    REPLACE NO. 1 JUNCTION CONNECTOR

  11. CONNECT CONNECTOR


    1. Reconnect the A39 No. 1 junction connector.


    NEXT

  12. CHECK FOR OPEN IN CAN BUS MAIN WIRE (ECM - NO. 1 JUNCTION CONNECTOR)


    1. A003COEE01
      Text in Illustration
      *1

      Front view of wire harness connector

      (to ECM)

      Disconnect the A40 ECM connector.

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

      Standard Resistance
      Tester Connection Switch Condition Specified Condition
      A40-7 (CANH) - A40-6 (CANL) Ignition switch off 108 to 132 Ω
      Result
      Result Proceed to
      OK (for 1AD-FTV) A
      OK (for 2AD-FTV) B
      OK (for 2AD-FHV) C
      NG D

    B

    REPLACE ECM Click here

    C

    REPLACE ECM Click here

    D

    REPAIR OR REPLACE CAN MAIN WIRE CONNECTED TO ECM (ECM - NO. 1 JUNCTION CONNECTOR)

    A

    REPLACE ECM Click here

  13. CONNECT CONNECTOR


    1. Reconnect the D90 No. 3 junction connector connector.


    NEXT

  14. CHECK FOR OPEN IN CAN BUS MAIN WIRE (NO. 4 JUNCTION CONNECTOR - COMBINATION METER)


    1. A003BZOE20
      Text in Illustration
      *1

      Rear view of wire harness connector

      (to No. 4 Junction Connector)

      Disconnect the D91 No. 4 junction connector connector.

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

      Standard Resistance
      Tester Connection Switch Condition Specified Condition
      D91-2 (CANH) - D91-13 (CANL) Ignition switch off 108 to 132 Ω

    NG

    CONNECT CONNECTOR Click here

    OK

  15. CHECK FOR OPEN IN CAN BUS MAIN WIRE (NO. 4 JUNCTION CONNECTOR - NO. 3 JUNCTION CONNECTOR)

    A003BZOE21
    Text in Illustration
    *1

    Rear view of wire harness connector

    (to No. 4 Junction Connector)

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

      Standard Resistance
      Tester Connection Switch Condition Specified Condition
      D91-1 (CANH) - D91-12 (CANL) Ignition switch off 108 to 132 Ω

    NG

    REPAIR OR REPLACE CAN MAIN WIRE OR CONNECTOR (NO. 4 JUNCTION CONNECTOR - NO. 3 JUNCTION CONNECTOR)

    OK

    REPLACE NO. 4 JUNCTION CONNECTOR

  16. CONNECT CONNECTOR


    1. Reconnect the D91 No. 4 junction connector connector.


    NEXT

  17. CHECK FOR OPEN IN CAN BUS MAIN WIRE (COMBINATION METER - NO. 4 JUNCTION CONNECTOR)


    1. A003B46E01
      Text in Illustration
      *1

      Front view of wire harness connector

      (to Combination Meter Assembly)

      Disconnect the D66 combination meter assembly connector.

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

      Standard Resistance
      Tester Connection Switch Condition Specified Condition
      D66-22 (CANH) - D66-23 (CANL) Ignition switch off 108 to 132 Ω

    NG

    REPAIR OR REPLACE CAN MAIN WIRE CONNECTED TO COMBINATION METER (COMBINATION METER - NO. 4 JUNCTION CONNECTOR)

    OK

    REPLACE COMBINATION METER ASSEMBLY Click here