CAN COMMUNICATION SYSTEM (for LHD with Entry and Start System) Open in One Side of CAN Branch Line

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)*1

  • Master cylinder solenoid (skid control ECU)*2

  • Four wheel drive control ECU

  • Certification ECU (smart key ECU assembly)

  • Power management control ECU

  • Power steering ECU assembly

  • Navigation receiver assembly*3

  • Radio and display receiver assembly*4

  • Spiral cable sub-assembly (steering angle sensor)

  • Yaw rate sensor assembly

  • Center airbag sensor assembly

  • Main body ECU (multiplex network body ECU)


WIRING DIAGRAM

A01DU5TE01
A01DQBME01
A01DTD4E02

INSPECTION PROCEDURE

Tech Tips


  • 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 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 the CAN branch wire.

PROCEDURE


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


    1. Disconnect the A6 brake actuator assembly (skid control ECU)*1 or A7 master cylinder solenoid (skid control ECU)*2 connector.


      • *1: for 2TR-FE

      • *2: for 1GR-FE, 1KD-FTV

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

      Result
      Result Proceed to
      "Skid Control (ABS/VSC/TRAC)" is not displayed on the intelligent tester (for 2TR-FE) A
      "Skid Control (ABS/VSC/TRAC)" is not displayed on the intelligent tester (for 1GR-FE, 1KD-FTV) B
      Several ECUs and sensors in addition to "Skid Control (ABS/VSC/TRAC)" are displayed on the intelligent tester C

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


    1. A01DMHLE10
      Text in Illustration
      *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 airbag system

      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.

      • 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
      A6-25 (CANH) - A6-14 (CANL) Engine switch off 54 to 69 Ω

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


    1. A01DQSDE03
      Text in Illustration
      *a

      Front view of wire harness connector

      (to Master Cylinder Solenoid [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 airbag system

      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.

      • 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
      A7-11 (CANH) - A7-25 (CANL) Engine switch off 54 to 69 Ω

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


    1. Disconnect the G64 main body ECU (multiplex network body ECU) connector.

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

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

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


    1. A01DT10E07
      Text in Illustration
      *a

      Rear view of wire harness connector

      (to Main Body ECU [Multiplex Network Body 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 airbag system

      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.

      • 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
      G64-14 (CANH) - G64-13 (CANL) Engine switch off 54 to 69 Ω

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


    1. Disconnect the G1 center airbag sensor assembly connector.

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

      Result
      Result Proceed to
      "Airbag" is not displayed on the intelligent tester A
      Several ECUs and sensors in addition to "Airbag" are displayed on the intelligent tester B

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


    1. A01DMGIE10
      Text in Illustration
      *a

      Front 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 airbag system

      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.

      • 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
      G1-13 (CANH) - G1-22 (CANL) Engine switch off 54 to 69 Ω

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


    1. Disconnect the G33 spiral cable sub-assembly (steering angle sensor) connector.

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

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

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


    1. A01DS8NE12
      Text in Illustration
      *a

      Rear view of wire harness connector

      (to Spiral 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 airbag system

      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.

      • 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
      G33-4 (CANH) - G33-3 (CANL) Engine switch off 54 to 69 Ω

    NG
    OK
  10. CHECK FOR OPEN IN ONE SIDE OF CAN BRANCH WIRE (FOUR WHEEL DRIVE CONTROL ECU)


    1. Disconnect the G53 four wheel drive control ECU connector.

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

      Result
      Result Proceed to
      "Four Wheel Drive Control" is not displayed on the intelligent tester A
      Several ECUs and sensors in addition to "Four Wheel Drive Control" are displayed on the intelligent tester B

    B
    A
  11. CHECK FOR OPEN IN ONE SIDE OF CAN BRANCH WIRE (FOUR WHEEL DRIVE CONTROL ECU CAN BRANCH WIRE)


    1. A01DOT6E04
      Text in Illustration
      *a

      Rear view of wire harness connector

      (to Four Wheel Drive 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 airbag system

      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.

      • 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
      G53-19 (CANH) - G53-20 (CANL) Engine switch off 54 to 69 Ω

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


    1. Disconnect the G38 certification ECU (smart key ECU assembly) connector.

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

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

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


    1. A01DMLUE10
      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 airbag system

      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.

      • 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
      G38-9 (CANH) - G38-10 (CANL) Engine switch off 54 to 69 Ω

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


    1. Disconnect the G46 power steering ECU assembly connector.

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

      Result
      Result Proceed to
      "PPS" is not displayed on the intelligent tester A
      Several ECUs and sensors in addition to "PPS" are displayed on the intelligent tester B

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


    1. A01DO0SE06
      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 airbag system

      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.

      • 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
      G46-1 (CANH) - G46-2 (CANL) Engine switch off 54 to 69 Ω

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


    1. Disconnect the G51 power management control ECU connector.

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

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

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


    1. A01DRF6E25
      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 airbag system

      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.

      • 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
      G51-14 (CA1H) - G51-13 (CA1L) Engine switch off 54 to 69 Ω

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


    1. Disconnect the G52 yaw rate sensor assembly connector.

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

      Result
      Result Proceed to
      "Yaw Rate Sensor" is not displayed on the intelligent tester A
      Several ECUs and sensors in addition to "Yaw Rate Sensor" are displayed on the intelligent tester (w/ Navigation System [for Navigation Receiver Type] or Navigation System [for Built-in Memory) B
      Several ECUs and sensors in addition to "Yaw Rate Sensor" are displayed on the intelligent tester (w/ Navigation System [for Radio and Display Type] or w/o Navigation System) C

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


    1. A01DN72E05
      Text in Illustration
      *a

      Front view of wire harness connector

      (to Yaw Rate 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 airbag system

      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.

      • 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
      G52-3 (CANH) - G52-2 (CANL) Engine switch off 54 to 69 Ω

    NG
    OK
  20. CHECK FOR OPEN IN ONE SIDE OF CAN BRANCH WIRE (NAVIGATION RECEIVER ASSEMBLY)


    1. A01DM2OE11
      Text in Illustration
      *A w/o DRL OFF Switch
      *B w/ DRL OFF Switch
      *a

      Front view of wire harness connector

      (to Navigation 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 airbag system

      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.

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

    2. Disconnect the H56*1 or H61*2 navigation receiver assembly connector.


      • *1: w/o DRL OFF Switch

      • *2: w/ DRL OFF Switch

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

      Standard Resistance
      w/o DRL OFF Switch
      Tester Connection Switch Condition Specified Condition
      H56-9 (CANH) - H56-10 (CANL) Engine switch off 54 to 69 Ω
      w/ DRL OFF Switch
      Tester Connection Switch Condition Specified Condition
      H61-9 (CANH) - H61-10 (CANL) Engine switch off 54 to 69 Ω

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


    1. A01DM2OE10
      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 airbag system

      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.

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

    2. Disconnect the H51 radio and display receiver assembly connector.

    3. 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) Engine switch off 54 to 69 Ω

    NG
    OK