CAN COMMUNICATION SYSTEM(for LHD) Open in CAN Main Wire

DESCRIPTION

There may be an open circuit in the CAN main wire and/or DLC3 CAN branch wire when the resistance between terminals 6 (CANH) and 14 (CANL) of the DLC3 is 70 Ω or higher.

Symptom Trouble Area
The resistance between terminals 6 (CANH) and 14 (CANL) of the DLC3 is 70 Ω or higher.

  • CAN main wire and connector

  • No. 1 junction connector

  • No. 2 junction connector

  • No. 3 junction connector

  • ECM

  • Center airbag sensor assembly

  • DLC3 CAN branch wire or connector

WIRING DIAGRAM

A001BKWE01
*a No. 1 Junction Connector
*b No. 3 Junction Connector
*c Center Airbag Sensor Assembly
*d No. 2 Junction Connector

CAUTION / NOTICE / HINT

Note

The vehicle is equipped with an SRS (Supplemental Restraint System) which includes components such as airbags. Before servicing (including removal or installation of parts), be sure to read the Precaution in the SRS Click here.

Tech Tips

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

PROCEDURE


  1. PRECAUTION

    Note

    After turning the engine switch off, waiting time may be required before disconnecting the cable from the battery terminal. Therefore, make sure to read the disconnecting the cable from the battery terminal notice before proceeding with work Click here.


    NEXT

  2. 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:

      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

  3. CHECK FOR OPEN IN CAN BUS WIRE (DLC3 CAN BRANCH WIRE)


    1. A001BMEE02
      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 Condition
      L31-6 (CANH) - L31-14 (CANL) Engine switch off 108 to 132 Ω

      Note

      When the measured value is 133 Ω or higher and a CAN communication system DTC is output, there may be a fault besides disconnection of the DLC3 branch line. For that reason, troubleshooting should be performed again from How to Proceed with Troubleshooting after repairing the trouble area Click here.


    NG

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

    OK

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


    1. A001A68E01
      Text in Illustration
      *a

      Rear view of wire harness connector

      (to No. 2 Junction Connector)

      Disconnect the No. 2 junction connector.

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

      Standard Resistance
      Tester Connection Switch Condition Specified Condition
      L97-4 (CANH) - L97-15 (CANL) Engine switch off 108 to 132 Ω

    NG

    CONNECT CONNECTOR Click here

    OK

  5. CHECK FOR OPEN IN CAN BUS MAIN WIRE (NO. 2 JUNCTION CONNECTOR - CENTER AIRBAG SENSOR ASSEMBLY)


    1. A001CK7E01
      Text in Illustration
      *a

      Rear view of wire harness connector

      (to No. 2 Junction Connector)

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

      Standard Resistance
      Tester Connection Switch Condition Specified Condition
      L97-1 (CANH) - L97-12 (CANL) Engine switch off 108 to 132 Ω

    OK

    REPLACE NO. 2 JUNCTION CONNECTOR

    NG

    CONNECT CONNECTOR Click here

  6. CONNECT CONNECTOR


    1. Reconnect the L97 No. 2 junction connector.


    NEXT

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


    1. A001BOUE01
      Text in Illustration
      *a

      Rear view of wire harness connector

      (to No. 1 Junction Connector)

      Disconnect the No. 1 junction connector.

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

      Standard Resistance
      Tester Connection Switch Condition Specified Condition
      A67-9 (CANH) - A67-20 (CANL) Engine switch off 108 to 132 Ω

    NG

    CONNECT CONNECTOR Click here

    OK

  8. CHECK FOR OPEN IN CAN BUS MAIN WIRE (NO. 1 JUNCTION CONNECTOR - NO. 2 JUNCTION CONNECTOR)


    1. A0019OGE01
      Text in Illustration
      *a

      Rear view of wire harness connector

      (to No. 1 Junction Connector)

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

      Standard Resistance
      Tester Connection Switch Condition Specified Condition
      A67-11 (CANH) - A67-22 (CANL) Engine switch off 108 to 132 Ω

    OK

    REPLACE NO. 1 JUNCTION CONNECTOR

    NG

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

  9. CONNECT CONNECTOR


    1. Reconnect the A67 No. 1 junction connector.


    NEXT

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


    1. A001ESFE01
      Text in Illustration
      *a

      Rear view of wire harness connector

      (to ECM)

      Disconnect the ECM connector.

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

      Standard Resistance
      Tester Connection Switch Condition Specified Condition
      A13-14 (CANH) - A13-13 (CANL) Engine switch off 108 to 132 Ω
      Result
      Result Proceed to
      OK (for 1UR-FSE) A
      OK (for 1UR-FE) B
      NG C

    A

    REPLACE ECM Click here

    B

    REPLACE ECM Click here

    C

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

  11. CONNECT CONNECTOR


    1. Reconnect the L97 No. 2 junction connector.


    NEXT

  12. CHECK FOR OPEN IN CAN BUS MAIN WIRE (NO. 3 JUNCTION CONNECTOR - CENTER AIRBAG SENSOR ASSEMBLY)


    1. A0019M6E01
      Text in Illustration
      *a

      Rear view of wire harness connector

      (to No. 3 Junction Connector)

      Disconnect the No. 3 junction connector.

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

      Standard Resistance
      Tester Connection Switch Condition Specified Condition
      L98-8 (CANH) - L98-19 (CANL) Engine switch off 108 to 132 Ω

    NG

    CONNECT CONNECTOR Click here

    OK

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


    1. A001BQ1E01
      Text in Illustration
      *a

      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
      L98-7 (CANH) - L98-18 (CANL) Engine switch off 108 to 132 Ω

    OK

    REPLACE NO. 3 JUNCTION CONNECTOR

    NG

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

  14. CONNECT CONNECTOR


    1. Reconnect the L98 No. 3 junction connector.


    NEXT

  15. CHECK FOR OPEN IN CAN BUS MAIN WIRE (CENTER AIRBAG SENSOR ASSEMBLY - NO. 3 JUNCTION CONNECTOR)


    1. A0018ZTE01
      Text in Illustration
      *a

      Rear view of wire harness connector

      (to Center Airbag Sensor Assembly)

      Disconnect the center airbag sensor assembly connector.

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

      Standard Resistance
      Tester Connection Switch Condition Specified Condition
      L73-13 (CANH) - L73-22 (CANL) Engine switch off 108 to 132 Ω

    OK

    REPLACE CENTER AIRBAG SENSOR ASSEMBLY Click here

    NG

    REPAIR OR REPLACE CAN MAIN WIRE CONNECTED TO CENTER AIRBAG SENSOR ASSEMBLY (CENTER AIRBAG SENSOR ASSEMBLY - NO. 3 JUNCTION CONNECTOR)