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

  • Hybrid vehicle control ECU

  • DLC3 CAN branch wire or connector

WIRING DIAGRAM

A000ZYQE02

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


    NEXT

  2. DISCONNECT CABLE FROM NEGATIVE AUXILIARY BATTERY TERMINAL


    1. Disconnect the cable from the negative (-) auxiliary 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 (-) auxiliary 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. A000YT2E01
      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 Measured Resistance
      L31-6 (CANH) - L31-14 (CANL) Power 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. A000YNZE01
      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) Power 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. A000XDFE01
      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) Power 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. A000TO5E01
      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) Power 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. A000Z90E01
      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) Power 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. A000UPJE02
      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) Power switch off 108 to 132 Ω

    OK

    REPLACE ECM Click here

    NG

  11. CONNECT CONNECTOR


    1. Reconnect the A13 ECM connector.


    NEXT

  12. CHECK FOR OPEN IN CAN BUS MAIN WIRE (HYBRID VEHICLE CONTROL ECU - ECM)


    1. A00104CE02
      Text in Illustration
      *a

      Rear view of wire harness connector

      (to Hybrid Vehicle Control ECU)

      Disconnect the hybrid vehicle control ECU connector.

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

      Standard Resistance
      Tester Connection Switch Condition Specified Condition
      A76-13 (CA3H) - A76-14 (CA3L) Power switch off 108 to 132 Ω

    NG

    REPAIR OR REPLACE CAN MAIN WIRE OR CONNECTOR (HYBRID VEHICLE CONTROL ECU - ECM)

    OK

  13. CHECK FOR OPEN IN CAN BUS MAIN WIRE (HYBRID VEHICLE CONTROL ECU - NO. 1 JUNCTION CONNECTOR)


    1. A000XCBE02
      Text in Illustration
      *a

      Rear view of wire harness connector

      (to Hybrid Vehicle Control ECU)

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

      Standard Resistance
      Tester Connection Switch Condition Specified Condition
      A76-15 (CANH) - A76-16 (CANL) Power switch off 108 to 132 Ω

    OK

    REPLACE HYBRID VEHICLE CONTROL ECU Click here

    NG

    REPAIR OR REPLACE CAN MAIN WIRE OR CONNECTOR (HYBRID VEHICLE CONTROL ECU - NO. 1 JUNCTION CONNECTOR)

  14. CONNECT CONNECTOR


    1. Reconnect the L97 No. 2 junction connector.


    NEXT

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


    1. A000YG2E01
      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) Power switch off 108 to 132 Ω

    NG

    CONNECT CONNECTOR Click here

    OK

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


    1. A000TVWE01
      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) Power 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)

  17. CONNECT CONNECTOR


    1. Reconnect the L98 No. 3 junction connector.


    NEXT

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


    1. A000XZKE01
      Text in Illustration
      *a

      Rear view of wire harness connector

      (to Center Airbag Sensor Assembly)

      Disconnect the center airbag sensor assembly connector Click here.

    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) Power 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)