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CAN COMMUNICATION SYSTEM Open in One Side of CAN Branch Line

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DTC Code DTC Name
  Open in One Side of CAN Branch Line
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DESCRIPTION

If 2 or more ECUs and/or sensors do not appear on the intelligent tester "Bus Check" screen, one side of the CAN branch wire may be open (one side of the CANH [CAN branch wire]/CANL [CAN branch wire] of the ECU and/or sensor is open).

Symptom Trouble Area
2 or more ECUs and/or sensors do not appear on the intelligent tester "Bus Check" screen.

  • Brake actuator assembly (skid control ECU)

  • Certification ECU (smart key ECU assembly)*1

  • Air conditioning amplifier assembly

  • Spiral with sensor cable sub-assembly (steering angle sensor)

  • Yaw rate sensor

  • Main body ECU (instrument panel junction block assembly)

  • Center airbag sensor assembly

  • Power management control ECU*1

  • Power steering ECU assembly

  • Radio and display receiver assembly*2

  • Engine stop and start ECU*3

A01INW3E01
A01IO9ZE01
A01IO0NE01
A01IRHWE01
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WIRING DIAGRAM

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INSPECTION PROCEDURE

Note:

  • For vehicles with an entry and start system:

    Before replacing the certification ECU (smart key ECU assembly), refer to the entry and start system (for Entry Function) (Click here).

  • After turning the ignition 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).

Tip:

  • Perform the following inspection for the ECUs (sensors) which are not displayed on the intelligent tester. If a malfunction cannot be identified, perform the following inspections for the ECUs (sensors) connected to the CAN communication system.

  • Do not remove the combination meter assembly and ECM, as they are the end parts of the circuit. If removed, CAN communication will not be possible.

  • The open circuit confirmation of the combination meter assembly, ECM and main wire is performed in the Check CAN Bus Line procedure of "How to Proceed with Troubleshooting". This inspection only has procedures for checking for an open circuit on one side of the CAN branch wire.

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PROCEDURE


  1. Click here

    CHECK FOR OPEN IN ONE SIDE OF CAN BRANCH WIRE (BRAKE ACTUATOR ASSEMBLY)


    1. Disconnect the A78*1 or A79*2 brake actuator assembly (skid control ECU) connector.


      • *1: for CVT

      • *2: for Manual Transaxle

    2. Select "Bus Check" on the intelligent tester (Click here).

      Table 1. Result
      Result Proceed to
      "Skid Control (ABS/VSC/TRAC)" not displayed on the intelligent tester. A
      Several ECUs and sensors in addition to "Skid Control (ABS/VSC/TRAC)" not displayed on the intelligent tester. B

  2. Click here

    CHECK FOR OPEN IN ONE SIDE OF CAN BRANCH WIRE (BRAKE ACTUATOR ASSEMBLY CAN BRANCH WIRE)


    1. A01IUCSE01

      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).

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

      Standard Resistance
      Table 2. for CVT
      Tester Connection Switch Condition Specified Condition
      A78-26 (CANH) - A78-14 (CANL) Ignition switch off 54 to 69 Ω
      Table 3. for Manual Transaxle
      Tester Connection Switch Condition Specified Condition
      A79-2 (CANH) - A79-16 (CANL) Ignition switch off 54 to 69 Ω
      Table 4. Text in Illustration
      *A for CVT
      *B for Manual Transaxle
      *a

      Front view of wire harness connector

      (to Brake Actuator Assembly)

  3. Click here

    CHECK FOR OPEN IN ONE SIDE OF CAN BRANCH WIRE (ENGINE STOP AND START ECU)

    Note:

    For vehicles without a stop and start system, go to "Check for Open in One Side of CAN Branch Wire (Main Body ECU)".


    1. Disconnect the H121 engine stop and start ECU connector.

    2. Select "Bus Check" on the intelligent tester (Click here).

      Table 5. Result
      Result Proceed to
      "Stop and Go/Start" not displayed on the intelligent tester. A
      Several ECUs and sensors in addition to "Stop and Go/Start" not displayed on the intelligent tester. B

  4. Click here

    CHECK FOR OPEN IN ONE SIDE OF CAN BRANCH WIRE (ENGINE STOP AND START ECU CAN BRANCH WIRE)


    1. A01IOU5E22

      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).

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

      Standard Resistance
      Tester Connection Switch Condition Specified Condition
      H121-15 (CANH) - H121-16 (CANL) Ignition switch off 54 to 69 Ω
      Table 6. Text in Illustration
      *a

      Rear view of wire harness connector

      (to Engine Stop and Start ECU)

  5. Click here

    CHECK FOR OPEN IN ONE SIDE OF CAN BRANCH WIRE (MAIN BODY ECU)


    1. Disconnect the H81 main body ECU (instrument panel junction block assembly) connector.

    2. Select "Bus Check" on the intelligent tester (Click here).

      Table 7. Result
      Result Proceed to
      "Main Body" not displayed on the intelligent tester. A
      Several ECUs and sensors in addition to "Main Body" not displayed on the intelligent tester. B

  6. Click here

    CHECK FOR OPEN IN ONE SIDE OF CAN BRANCH WIRE (MAIN BODY ECU CAN BRANCH WIRE)


    1. A01IN0UE05

      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).

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

      Standard Resistance
      Tester Connection Switch Condition Specified Condition
      H81-15 (CANH) - H81-16 (CANL) Ignition switch off 54 to 69 Ω
      Table 8. Text in Illustration
      *a

      Rear view of wire harness connector

      (to Main Body ECU [Instrument Panel Junction Block Assembly])

  7. Click here

    CHECK FOR OPEN IN ONE SIDE OF CAN BRANCH WIRE (YAW RATE SENSOR)


    1. Disconnect the H68 yaw rate sensor connector.

    2. Select "Bus Check" on the intelligent tester (Click here).

      Table 9. Result
      Result Proceed to
      "Yaw Rate Sensor" not displayed on the intelligent tester. A
      Several ECUs and sensors in addition to "Yaw Rate Sensor" not displayed on the intelligent tester. B

  8. Click here

    CHECK FOR OPEN IN ONE SIDE OF CAN BRANCH WIRE (YAW RATE SENSOR CAN BRANCH WIRE)


    1. A01IPT7E18

      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).

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

      Standard Resistance
      Tester Connection Switch Condition Specified Condition
      H68-2 (CANH) - H68-3 (CANL) Ignition switch off 54 to 69 Ω
      Table 10. Text in Illustration
      *a

      Front view of wire harness connector

      (to Yaw Rate Sensor)

  9. Click here

    CHECK FOR OPEN IN ONE SIDE OF CAN BRANCH WIRE (SPIRAL WITH SENSOR CABLE SUB-ASSEMBLY)


    1. Disconnect the H128 spiral with sensor cable sub-assembly (steering angle sensor) connector.

    2. Select "Bus Check" on the intelligent tester (Click here).

      Table 11. Result
      Result Proceed to
      "Spiral cable (Steering Angle Sensor)" not displayed on the intelligent tester. A
      Several ECUs and sensors in addition to "Spiral cable (Steering Angle Sensor)" not displayed on the intelligent tester. B

  10. Click here

    CHECK FOR OPEN IN ONE SIDE OF CAN BRANCH WIRE (SPIRAL WITH SENSOR CABLE SUB-ASSEMBLY CAN BRANCH WIRE)


    1. A01IPSCE40

      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).

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

      Standard Resistance
      Tester Connection Switch Condition Specified Condition
      H128-4 (CANH) - H128-3 (CANL) Ignition switch off 54 to 69 Ω
      Table 12. Text in Illustration
      *a

      Rear view of wire harness connector

      (to Spiral with Sensor Cable Sub-assembly)

  11. Click here

    CHECK FOR OPEN IN ONE SIDE OF CAN BRANCH WIRE (POWER STEERING ECU ASSEMBLY)


    1. Disconnect the H49 power steering ECU assembly connector.

    2. Select "Bus Check" on the intelligent tester (Click here).

      Table 13. Result
      Result Proceed to
      "Power Steering (EPS)" not displayed on the intelligent tester. A
      Several ECUs and sensors in addition to "Power Steering (EPS)" not displayed on the intelligent tester. B

  12. Click here

    CHECK FOR OPEN IN ONE SIDE OF CAN BRANCH WIRE (POWER STEERING ECU ASSEMBLY CAN BRANCH WIRE)


    1. A01IRTBE07

      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).

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

      Standard Resistance
      Tester Connection Switch Condition Specified Condition
      H49-2 (CANH) - H49-8 (CANL) Ignition switch off 54 to 69 Ω
      Table 14. Text in Illustration
      *a

      Front view of wire harness connector

      (to Power Steering ECU Assembly)

  13. Click here

    CHECK FOR OPEN IN ONE SIDE OF CAN BRANCH WIRE (RADIO AND DISPLAY RECEIVER ASSEMBLY)

    Note:

    For vehicles without a radio and display type, go to "Check for Open in One Side of CAN Branch Wire (Air Conditioning Amplifier Assembly)".


    1. Disconnect the H105 radio and display receiver assembly connector.

    2. Select "Bus Check" on the intelligent tester (Click here).

      Table 15. Result
      Result Proceed to
      "Display and Navigation (AVN1)" not displayed on the intelligent tester. A
      Several ECUs and sensors in addition to "Display and Navigation (AVN1)" not displayed on the intelligent tester. B

  14. Click here

    CHECK FOR OPEN IN ONE SIDE OF CAN BRANCH WIRE (RADIO AND DISPLAY RECEIVER ASSEMBLY CAN BRANCH WIRE)


    1. A01ISS8E16

      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).

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

      Standard Resistance
      Tester Connection Switch Condition Specified Condition
      H105-9 (CANH) - H105-10 (CANL) Ignition switch off 54 to 69 Ω
      Table 16. Text in Illustration
      *a

      Front view of wire harness connector

      (to Radio and Display Receiver Assembly)

  15. Click here

    CHECK FOR OPEN IN ONE SIDE OF CAN BRANCH WIRE (AIR CONDITIONING AMPLIFIER ASSEMBLY)

    Note:

    For vehicles with a 1WW engine type and entry and start system, go to "Check for Open in One Side of CAN Branch Wire (Certification ECU)".


    1. Disconnect the H46*1 or H118*2 air conditioning amplifier assembly connector.


      • *1: for Automatic Air Conditioning System

      • *2: for Manual Air Conditioning System or w/o Air Conditioning System

    2. Select "Bus Check" on the intelligent tester (Click here).

      Table 17. Result
      Result Proceed to
      "Air Conditioning Amplifier" not displayed on the intelligent tester. A
      Several ECUs and sensors in addition to "Air Conditioning Amplifier" not displayed on the intelligent tester. B

  16. Click here

    CHECK FOR OPEN IN ONE SIDE OF CAN BRANCH WIRE (AIR CONDITIONING AMPLIFIER ASSEMBLY CAN BRANCH WIRE)


    1. A01IT2QE01

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

      Table 18. Text in Illustration
      *A for Automatic Air Conditioning System *B for Manual Air Conditioning System or w/ o Air Conditioning System
      *a

      Front view of wire harness connector

      (to Air Conditioning Amplifier Assembly)

      		 - -
      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).

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

      Standard Resistance
      for Automatic Air Conditioning System
      Tester Connection Switch Condition Specified Condition
      H46-11 (CANH) - H46-12 (CANL) Ignition switch off 54 to 69 Ω
      for Manual Air Conditioning System or w/o Air Conditioning System
      Tester Connection Switch Condition Specified Condition
      H118-8 (CANH) - H118-9 (CANL) Ignition switch off 54 to 69 Ω

  17. Click here

    CHECK FOR OPEN IN ONE SIDE OF CAN BRANCH WIRE (CERTIFICATION ECU)

    Note:

    For vehicles without an entry and start system, go to "Check for Open in One Side of CAN Branch Wire (Power Management Control ECU)".


    1. Disconnect the H51 certification ECU (smart key ECU assembly) connector.

    2. Select "Bus Check" on the intelligent tester (Click here).

      Table 19. Result
      Result Proceed to
      "Certification (Smart)" not displayed on the intelligent tester. A
      Several ECUs and sensors in addition to "Certification (Smart)" not displayed on the intelligent tester. B

  18. Click here

    CHECK FOR OPEN IN ONE SIDE OF CAN BRANCH WIRE (CERTIFICATION ECU CAN BRANCH WIRE)


    1. A01ISYUE44

      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).

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

      Standard Resistance
      Tester Connection Switch Condition Specified Condition
      H51-9 (CANH) - H51-10 (CANL) Ignition switch off 54 to 69 Ω
      Table 20. Text in Illustration
      *a

      Rear view of wire harness connector

      (to Certification ECU [Smart Key ECU Assembly])

  19. Click here

    CHECK FOR OPEN IN ONE SIDE OF CAN BRANCH WIRE (POWER MANAGEMENT CONTROL ECU)

    Note:

    For vehicles without an entry and start system, go to "Check for Open in One Side of CAN Branch Wire (Center Airbag Sensor Assembly CAN Branch Wire)".


    1. Disconnect the H71 power management control ECU connector.

    2. Select "Bus Check" on the intelligent tester (Click here).

      Table 21. Result
      Result Proceed to
      "Power Management1" not displayed on the intelligent tester. A
      Several ECUs and sensors in addition to "Power Management1" not displayed on the intelligent tester. B

  20. Click here

    CHECK FOR OPEN IN ONE SIDE OF CAN BRANCH WIRE (POWER MANAGEMENT CONTROL ECU CAN BRANCH WIRE)


    1. A01IOSCE97

      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).

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

      Standard Resistance
      Tester Connection Switch Condition Specified Condition
      H71-14 (CA1H) - H71-13 (CA1L) Ignition switch off 54 to 69 Ω
      Table 22. Text in Illustration
      *a

      Rear view of wire harness connector

      (to Power Management Control ECU)
      Table 23. Result
      Result Proceed to
      OK (for LHD) A
      OK (for RHD) B
      NG C

  21. Click here

    CHECK FOR OPEN IN ONE SIDE OF CAN BRANCH WIRE (CENTER AIRBAG SENSOR ASSEMBLY CAN BRANCH WIRE)


    1. A01IRRWE23

      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).

    2. Disconnect the center airbag sensor assembly connector (Click here).

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

      Standard Resistance
      Tester Connection Switch Condition Specified Condition
      H19-13 (CANH) - H19-22 (CANL) Ignition switch off 54 to 69 Ω
      Table 24. Text in Illustration
      *a

      Front view of wire harness connector

      (to Center Airbag Sensor Assembly)

  22. Click here

    REPLACE BRAKE ACTUATOR ASSEMBLY (SKID CONTROL ECU)Click here

  23. Click here

    REPAIR OR REPLACE CAN BRANCH WIRE OR CONNECTOR (BRAKE ACTUATOR ASSEMBLY)

  24. Click here

    REPLACE ENGINE STOP AND START ECUClick here

  25. Click here

    REPAIR OR REPLACE CAN BRANCH WIRE OR CONNECTOR (ENGINE STOP AND START ECU)

  26. Click here

    REPLACE MAIN BODY ECU (INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY)

  27. Click here

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

  28. Click here

    REPLACE YAW RATE SENSORClick here

  29. Click here

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

  30. Click here

    ADJUST SPIRAL WITH SENSOR CABLE SUB-ASSEMBLY (STEERING ANGLE SENSOR)Click here

  31. Click here

    REPAIR OR REPLACE CAN BRANCH WIRE OR CONNECTOR (SPIRAL WITH SENSOR CABLE SUB-ASSEMBLY)

  32. Click here

    REPLACE POWER STEERING ECU ASSEMBLYClick here

  33. Click here

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

  34. Click here

    REPLACE RADIO AND DISPLAY RECEIVER ASSEMBLYClick here

  35. Click here

    REPAIR OR REPLACE CAN BRANCH WIRE OR CONNECTOR (RADIO AND DISPLAY RECEIVER ASSEMBLY)

  36. Click here

    REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLYClick here

  37. Click here

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

  38. Click here

    REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)

  39. Click here

    REPAIR OR REPLACE CAN BRANCH WIRE OR CONNECTOR (CERTIFICATION ECU)

  40. Click here

    REPLACE POWER MANAGEMENT CONTROL ECUClick here

  41. Click here

    REPLACE POWER MANAGEMENT CONTROL ECUClick here

  42. Click here

    REPAIR OR REPLACE CAN BRANCH WIRE OR CONNECTOR (POWER MANAGEMENT CONTROL ECU)

  43. Click here

    REPLACE CENTER AIRBAG SENSOR ASSEMBLYClick here

  44. Click here

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