CAN COMMUNICATION SYSTEM (for RHD without 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

  • Main body ECU (multiplex network body ECU)

  • Center airbag sensor assembly

  • Spiral cable sub-assembly (steering angle sensor)*2

  • Radio and display receiver assembly*3

  • Four wheel drive control ECU

  • Air conditioning amplifier assembly

  • Power steering ECU assembly*4

  • Network gateway ECU*5

  • Yaw rate sensor assembly

WIRING DIAGRAM

A01DUACE01
A01DS6YE01
A01DQ6GE01

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*1 or No. 4 junction connector*2, as they are the end parts of the circuit. If removed, CAN communication will not be possible.


    • *1: for 1KD-FTV

    • *2: for 5L-E

  • 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: w/o Vehicle Stability Control System

      • *2: w/ Vehicle Stability Control System (for Hydraulic Brake Booster)

    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 (w/o Vehicle Stability Control System) A
      "Skid Control (ABS/VSC/TRAC)" is not displayed on the intelligent tester (w/ Vehicle Stability Control System [for Hydraulic Brake Booster]) B
      Several ECUs and sensors in addition to "Skid Control (ABS/VSC/TRAC)" are displayed on the intelligent tester C

    B

    CHECK FOR OPEN IN ONE SIDE OF CAN BRANCH WIRE (SKID CONTROL ECU CAN BRANCH WIRE) Click here

    C

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

    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 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.

      • 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) Ignition switch off 54 to 69 Ω

    NG

    REPAIR OR REPLACE CAN BRANCH WIRE OR CONNECTOR (SKID CONTROL ECU)

    OK

    REPLACE BRAKE ACTUATOR ASSEMBLY (SKID CONTROL ECU) Click here

  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 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.

      • 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) Ignition switch off 54 to 69 Ω

    NG

    REPAIR OR REPLACE CAN BRANCH WIRE OR CONNECTOR (SKID CONTROL ECU)

    OK

    REPLACE MASTER CYLINDER SOLENOID (SKID CONTROL ECU) Click here

  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

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

    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 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.

      • 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) Ignition switch off 54 to 69 Ω

    NG

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

    OK

    REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) Click here

  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

    CHECK FOR OPEN IN ONE SIDE OF CAN BRANCH WIRE (STEERING ANGLE SENSOR) Click here

    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 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.

      • 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) Ignition switch off 54 to 69 Ω

    NG

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

    OK

    REPLACE CENTER AIRBAG SENSOR ASSEMBLY Click here

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

    Note

    For vehicles without a vehicle stability control system (for hydraulic brake booster), go to "Check for Open in One Side of CAN Branch Wire (Radio and Display Receiver Assembly)".


    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

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

    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 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.

      • 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) Ignition switch off 54 to 69 Ω

    NG

    REPAIR OR REPLACE CAN BRANCH WIRE OR CONNECTOR (STEERING ANGLE SENSOR)

    OK

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

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

    Note

    For vehicles without an audio and visual system (for radio and display type), go to "Check for Open in One Side of CAN Branch Wire (Four Wheel Drive Control ECU)".


    1. Disconnect the H4 radio and display receiver assembly connector.

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

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

    B

    CHECK FOR OPEN IN ONE SIDE OF CAN BRANCH WIRE (FOUR WHEEL DRIVE CONTROL ECU) Click here

    A

  11. 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 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.

      • 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

    NG

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

    OK

    REPLACE RADIO AND DISPLAY RECEIVER ASSEMBLY

  12. 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

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

    A

  13. 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 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.

      • 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) Ignition switch off 54 to 69 Ω

    NG

    REPAIR OR REPLACE CAN BRANCH WIRE OR CONNECTOR (FOUR WHEEL DRIVE CONTROL ECU)

    OK

    REPLACE FOUR WHEEL DRIVE CONTROL ECU Click here

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


    1. Disconnect the G25 air conditioning amplifier assembly connector.

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

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

    B

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

    A

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


    1. A01DPFFE11
      Text in Illustration
      *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 airbag system

      Note


      • 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.

      • 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
      G25-11 (CANH) - G25-12 (CANL) Ignition switch off 54 to 69 Ω

    NG

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

    OK

    REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY Click here

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

    Note

    For vehicles with a 5L-E engine, go to "Check for Open in One Side of CAN Branch Wire (Network Gateway ECU)".


    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

    CHECK FOR OPEN IN ONE SIDE OF CAN BRANCH WIRE (NETWORK GATEWAY ECU) Click here

    A

  17. 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 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.

      • 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) Ignition switch off 54 to 69 Ω

    NG

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

    OK

    REPLACE POWER STEERING ECU ASSEMBLY Click here

  18. CHECK FOR OPEN IN ONE SIDE OF CAN BRANCH WIRE (NETWORK GATEWAY ECU)

    Note

    For vehicles without a TOYOTA parking assist-sensor system (for 4 sensor type), go to "Check for Open in One Side of CAN Branch Wire (Yaw Rate Sensor Assembly CAN Branch Wire)".


    1. Disconnect the H102 network gateway ECU connector.

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

      Result
      Result Proceed to
      "CAN Gateway1" is not displayed on the intelligent tester A
      Several ECUs and sensors in addition to "CAN Gateway1" are displayed on the intelligent tester B

    B

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

    A

  19. CHECK FOR OPEN IN ONE SIDE OF CAN BRANCH WIRE (NETWORK GATEWAY ECU CAN BRANCH WIRE)


    1. A01DP7QE26
      Text in Illustration
      *a

      Rear view of wire harness connector

      (to Network Gateway 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 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.

      • 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
      G155-16 (CA1H) - G155-15 (CA1L) Ignition switch off 54 to 69 Ω

    NG

    REPAIR OR REPLACE CAN BRANCH WIRE OR CONNECTOR (NETWORK GATEWAY ECU)

    OK

    REPLACE NETWORK GATEWAY ECU Click here

  20. 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 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.

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

    2. Disconnect the G52 yaw rate sensor assembly connector.

    3. 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) Ignition switch off 54 to 69 Ω

    NG

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

    OK

    REPLACE YAW RATE SENSOR ASSEMBLY Click here