CAN COMMUNICATION SYSTEM Open in One Side of CAN Branch Line

DESCRIPTION

If 2 or more ECUs and/or sensors do not appear on the GTS "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 GTS "Bus Check" screen.
  • Brake actuator assembly (skid control ECU)

  • Parking brake with bracket actuator assembly (parking brake ECU)

  • Certification ECU (smart key ECU assembly)*1

  • Power steering ECU assembly

  • Air conditioning amplifier assembly*2

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

  • Yaw rate sensor

  • Main body ECU (instrument panel junction block assembly)

  • Radio and display receiver assembly*3

  • Headlight swivel ECU assembly*5

  • Headlight leveling ECU assembly*6

  • Power management control ECU*1

  • Center airbag sensor assembly

  • Pre-crash safety city sensor*4

  • CAN branch wire or connector


WIRING DIAGRAM

A0055OAE02
A0052XDE02
A0053OYE02
w/ Entry and Start System
*a Yaw Rate Sensor
*b Combination Meter Assembly
*c No. 3 Junction Connector
A0059LFE02
A0057KCE02
A0053ZAE02

CAUTION / NOTICE / HINT

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.

  • As the door control battery is installed between the vehicle battery and main body ECU (instrument panel junction block assembly), first perform the inspections in On-Vehicle Inspection to confirm that there are no malfunctions in the power source circuit for the main body ECU (instrument panel junction block assembly) before performing this troubleshooting procedure 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.

Tech Tips


  • Perform the following inspection for the ECUs (sensors) which are displayed on the GTS. 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 CAN 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 a CAN branch wire.

PROCEDURE


  1. CHECK FOR OPEN IN ONE SIDE OF CAN BRANCH WIRE (SKID CONTROL ECU)


    1. Disconnect the A68*1 or A69*2 brake actuator assembly (skid control ECU) connector.


      • *1: for CVT

      • *2: except CVT

    2. Select "Bus Check" on the GTS Click here.

      Result
      Result Proceed to
      "Skid Control (ABS/VSC/TRAC)" is not displayed on the GTS A
      Several ECUs and sensors in addition to "Skid Control (ABS/VSC/TRAC)" are displayed on the GTS B

    B
    A
  2. CHECK FOR OPEN IN ONE SIDE OF CAN BRANCH WIRE (SKID CONTROL ECU CAN BRANCH WIRE)


    1. A0056BOE02
      Text in Illustration
      *A for CVT
      *B except CVT
      *a

      Front view of wire harness connector

      (to Brake Actuator Assembly [Skid Control ECU])

      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
      for CVT
      Tester Connection Switch Condition Specified Condition
      A68-26 (CANH) - A68-14 (CANL) Ignition switch off 54 to 69 Ω
      except CVT
      Tester Connection Switch Condition Specified Condition
      A69-2 (CANH) - A69-16 (CANL) Ignition switch off 54 to 69 Ω

    OK
    NG
  3. CHECK FOR OPEN IN ONE SIDE OF CAN BRANCH WIRE (PARKING BRAKE ECU)


    1. Disconnect the I1 parking brake with bracket actuator assembly (parking brake ECU) connector.

    2. Select "Bus Check" on the GTS Click here.

      Result
      Result Proceed to
      "Electric Parking Brake" is not displayed on the GTS A
      Several ECUs and sensors in addition to "Electric Parking Brake" are displayed on the GTS B

    B
    A
  4. CHECK FOR OPEN IN ONE SIDE OF CAN BRANCH WIRE (PARKING BRAKE ECU CAN BRANCH WIRE)


    1. A0058SWE02
      Text in Illustration
      *a

      Front view of wire harness connector

      (to Electric Parking Brake with Bracket Actuator Assembly [Parking Brake ECU])

      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
      I1-11 (CANH) - I1-23 (CANL) Ignition switch off 54 to 69 Ω

    OK
    NG
  5. 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 Steering ECU Assembly)".


    1. Disconnect the D54 certification ECU (smart key ECU assembly) connector.

    2. Select "Bus Check" on the GTS Click here.

      Result
      Result Proceed to
      "Certification (Smart)" is not displayed on the GTS A
      Several ECUs and sensors in addition to "Certification (Smart)" are displayed on the GTS B

    B
    A
  6. CHECK FOR OPEN IN ONE SIDE OF CAN BRANCH WIRE (CERTIFICATION ECU CAN BRANCH WIRE)


    1. A00537VE02
      Text in Illustration
      *a

      Rear view of wire harness connector

      (to Certification ECU [Smart Key ECU Assembly])

      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
      D54-9 (CANH) - D54-10 (CANL) Ignition switch off 54 to 69 Ω

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


    1. Disconnect the D50 power steering ECU assembly connector.

    2. Select "Bus Check" on the GTS Click here.

      Result
      Result Proceed to
      "Power Steering (EPS)" is not displayed on the GTS A
      Several ECUs and sensors in addition to "Power Steering (EPS)" are displayed on the GTS B

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


    1. A0058O3E02
      Text in Illustration
      *a

      Rear view of wire harness connector

      (to Power Steering ECU Assembly)

      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
      D50-1 (CANH) - D50-7 (CANL) Ignition switch off 54 to 69 Ω
      Result
      Result Proceed to
      OK (for LHD) A
      OK (for RHD) B
      NG C

    A
    B
    C
  9. CHECK FOR OPEN IN ONE SIDE OF CAN BRANCH WIRE (AIR CONDITIONING AMPLIFIER ASSEMBLY)

    Note

    For vehicles with an entry and start system, go to "Check for Open in One Side of CAN Branch Wire (Steering Angle Sensor)".


    1. Disconnect the D47*1 or D101*2 air conditioning amplifier assembly connector.


      • *1: for Automatic Air Conditioning System

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

    2. Select "Bus Check" on the GTS Click here.

      Result
      Result Proceed to
      "Air Conditioning Amplifier" is not displayed on the GTS A
      Several ECUs and sensors in addition to "Air Conditioning Amplifier" are displayed on the GTS B

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


    1. A0057LXE02
      Text in Illustration
      *A for Automatic Air Conditioning System
      *B for Manual Air Conditioning System and w/o Air Conditioning System
      *a

      Rear view of wire harness connector

      (to Air Conditioning Amplifier Assembly)

      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
      for Automatic Air Conditioning System
      Tester Connection Switch Condition Specified Condition
      D47-11 (CANH) - D47-12 (CANL) Ignition switch off 54 to 69 Ω
      for Manual Air Conditioning System and w/o Air Conditioning System
      Tester Connection Switch Condition Specified Condition
      D101-11 (CANH) - D101- 12 (CANL) Ignition switch off 54 to 69 Ω

    OK
    NG
  11. CHECK FOR OPEN IN ONE SIDE OF CAN BRANCH WIRE (STEERING ANGLE SENSOR)


    1. Disconnect the D166 spiral with sensor cable sub-assembly (steering angle sensor) connector.

    2. Select "Bus Check" on the GTS Click here.

      Result
      Result Proceed to
      "Spiral cable (Steering Angle Sensor)" is not displayed on the GTS A
      Several ECUs and sensors in addition to "Spiral cable (Steering Angle Sensor)" are displayed on the GTS B

    B
    A
  12. CHECK FOR OPEN IN ONE SIDE OF CAN BRANCH WIRE (STEERING ANGLE SENSOR CAN BRANCH WIRE)


    1. A005650E02
      Text in Illustration
      *a

      Rear view of wire harness connector

      (to Spiral with Sensor Cable Sub-assembly [Steering Angle Sensor])

      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
      D166-4 (CANH) - D166-3 (CANL) Ignition switch off 54 to 69 Ω

    OK
    NG
  13. CHECK FOR OPEN IN ONE SIDE OF CAN BRANCH WIRE (YAW RATE SENSOR)


    1. Disconnect the D69 yaw rate sensor connector.

    2. Select "Bus Check" on the GTS Click here.

      Result
      Result Proceed to
      "Yaw Rate Sensor" is not displayed on the GTS A
      Several ECUs and sensors in addition to "Yaw Rate Sensor" are displayed on the GTS B

    B
    A
  14. CHECK FOR OPEN IN ONE SIDE OF CAN BRANCH WIRE (YAW RATE SENSOR CAN BRANCH WIRE)


    1. A005439E02
      Text in Illustration
      *a

      Front view of wire harness connector

      (to Yaw Rate Sensor)

      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
      D69-2 (CANH) - D69-3 (CANL) Ignition switch off 54 to 69 Ω

    OK
    NG
  15. CHECK FOR OPEN IN ONE SIDE OF CAN BRANCH WIRE (MAIN BODY ECU)


    1. Disconnect the D81 main body ECU (instrument panel junction block assembly) connector.

    2. Select "Bus Check" on the GTS Click here.

      Result
      Result Proceed to
      "Main Body" is not displayed on the GTS A
      Several ECUs and sensors in addition to "Main Body" are displayed on the GTS B

    B
    A
  16. CHECK FOR OPEN IN ONE SIDE OF CAN BRANCH WIRE (MAIN BODY ECU CAN BRANCH WIRE)


    1. B0040MGE02
      Text in Illustration
      *a

      Front view of wire harness connector

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

      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
      D81-15 (CANH) - D81-16 (CANL) Ignition switch off 54 to 69 Ω

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

    Note

    For vehicles without radio and display type, go to "Check for Open in One Side of CAN Branch Wire (Headlight Swivel ECU Assembly)".


    1. Disconnect the D124 radio and display receiver assembly connector.

    2. Select "Bus Check" on the GTS Click here.

      Result
      Result Proceed to
      "Display and Navigation (AVN)" is not displayed on the GTS A
      Several ECUs and sensors in addition to "Display and Navigation (AVN)" are displayed on the GTS B

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


    1. A005957E02
      Text in Illustration
      *a

      Front view of wire harness connector

      (to Radio and Display Receiver Assembly)

      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
      D124-9 (CANH) - D124-10 (CANL) Ignition switch off 54 to 69 Ω

    OK
    NG
  19. CHECK FOR OPEN IN ONE SIDE OF CAN BRANCH WIRE (HEADLIGHT ECU)

    Note

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


    1. Disconnect the A38 headlight swivel ECU assembly*1 or A66 headlight leveling ECU assembly*2 connector.


      • *1: w/ Adaptive Front-lighting System

      • *2: w/o Adaptive Front-lighting System

    2. Select "Bus Check" on the GTS Click here.

      Result
      Result Proceed to
      "Headlight swivel (AFS)" is not displayed on the GTS A
      Several ECUs and sensors in addition to "Headlight swivel (AFS)" are displayed on the GTS B

    B
    A
  20. CHECK FOR OPEN IN ONE SIDE OF CAN BRANCH WIRE (HEADLIGHT ECU CAN BRANCH WIRE)


    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.

    2. A0053LUE02
      Text in Illustration
      *a

      Rear view of wire harness connector

      (to Headlight Swivel ECU Assembly)

      w/ Adaptive Front-lighting System:


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

        Standard Resistance
        Tester Connection Switch Condition Specified Condition
        A38-12 (CANH) - A38-13 (CANL) Ignition switch off 54 to 69 Ω
    3. A005391E02
      Text in Illustration
      *a

      Front view of wire harness connector

      (to Headlight Leveling ECU Assembly)

      w/o Adaptive Front-lighting System:


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

        Standard Resistance
        Tester Connection Switch Condition Specified Condition
        A66-6 (CANH) - A66-7 (CANL) Ignition switch off 54 to 69 Ω
      Result
      Result Proceed to
      OK (w/ Adaptive Front-lighting System) A
      OK (for LHD, w/o Adaptive Front-lighting System) B
      OK (for RHD, w/o Adaptive Front-lighting System) C
      NG D

    A
    B
    C
    D
  21. 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 (Pre-crash Safety City Sensor)".


    1. Disconnect the D109 power management control ECU connector.

    2. Select "Bus Check" on the GTS Click here.

      Result
      Result Proceed to
      "Power Management1" is not displayed on the GTS A
      Several ECUs and sensors in addition to "Power Management1" are displayed on the GTS B

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


    1. A00556LE02
      Text in Illustration
      *a

      Rear view of wire harness connector

      (to Power Management Control ECU)

      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
      D109-14 (CA1H) - D109-13 (CA1L) Ignition switch off 54 to 69 Ω

    OK
    NG
  23. CHECK FOR OPEN IN ONE SIDE OF CAN BRANCH WIRE (PRE-CRASH SAFETY CITY SENSOR)

    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 K14 pre-crash safety city sensor connector.

    2. Select "Bus Check" on the GTS Click here.

      Result
      Result Proceed to
      "Front Camera Module" is not displayed on the GTS A
      Several ECUs and sensors in addition to "Front Camera Module" are displayed on the GTS B

    B
    A
  24. CHECK FOR OPEN IN ONE SIDE OF CAN BRANCH WIRE (PRE-CRASH SAFETY CITY SENSOR CAN BRANCH WIRE)


    1. A00583LE02
      Text in Illustration
      *a

      Front view of wire harness connector

      (to Pre-crash Safety City Sensor)

      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
      K14-5 (CA1P) - K14-11 (CA1N) Ignition switch off 54 to 69 Ω

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


    1. A00593KE02
      Text in Illustration
      *a

      Rear view of wire harness connector

      (to Center Airbag Sensor Assembly)

      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.

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

      Standard Resistance
      Tester Connection Switch Condition Specified Condition
      D10-13 (CANH) - D10-22 (CANL) Ignition switch off 54 to 69 Ω

    OK
    NG