CAN COMMUNICATION SYSTEM TERMINALS OF ECU

Note


  • After turning the ignition switch off, waiting time may be required before disconnecting the cable from the negative (-) battery terminal. Therefore, make sure to read the disconnecting the cable from the negative (-) battery terminal notices before proceeding with work Click here.

  • Turn the ignition switch off before measuring the resistances between CAN main bus lines and between CAN branch lines.

  • Turn the ignition switch off before inspecting CAN bus lines for a ground short.

  • Before measuring the resistance of the CAN bus, turn the ignition switch off and leave the vehicle for 1 minute or more without operating the key, switches or opening or closing the doors. After that, disconnect the cable from the negative (-) battery terminal and leave the vehicle for 1 minute or more before measuring the resistance.

  • This section describes the standard values for all CAN related components.

Tech Tips


  • Operating the ignition switch, any other switches or a door triggers related ECU and sensor communication on the CAN. This communication will cause the resistance value to change.

  • Even after DTCs are cleared, if a DTC is stored again after driving the vehicle for a while, the malfunction may be occurring due to vibration of the vehicle. In such a case, wiggling the ECUs or wire harness while performing the inspection below may help determine the cause of the malfunction.


  1. CAN NO. 1 JUNCTION CONNECTOR (for LHD)


    1. Check the CAN No. 1 junction connector.

      Tech Tips

      Connectors that connect to the CAN junction connector can be distinguished by color of their CAN bus lines. When the connectors have been disconnected from the CAN junction connector, reconnecting the connectors to non-original positions on the CAN junction connector does not affect system performance. However, it is preferred to reconnect the connectors to their original positions to avoid negative effects on the wiring such as tension on the wiring harnesses, and to make future maintenance easier.


      1. Connection diagram

        A01EVIIE01
        Text in Illustration
        *a

        Component with harness connected

        (CAN No. 1 Junction Connector)

        		 *b

        to AFS ECU*1

        (for V Bus)
        *c

        to Main Body ECU (Multiplex Network Body ECU)

        (for V Bus)

        		 *d

        to Steering Sensor

        (for V Bus)
        *e

        to Airbag Sensor Assembly

        (for V Bus)

        		 *f to DLC3
        *g

        to Power Steering ECU with Motor Assembly

        (for V Bus)

        		 *h

        to Combination Meter Assembly

        (for V Bus)
        *i

        to CAN No. 2 Junction Connector

        (for V Bus)

        		 - -

        *1: w/ AFS

      2. Check the connection diagram of the components which are connected to the CAN No. 1 junction connector.

        Terminal No. (Symbol) Wiring Color Connected to
        I112-1 (CANH) BE

        AFS ECU*1

        (for V bus)
        I112-2 (CANL) W
        I95-1 (CANH) P

        Main body ECU (Multiplex network body ECU)

        (for V bus)
        I95-2 (CANL) W
        I97-1 (CANH) V

        Steering sensor

        (for V bus)
        I97-2 (CANL) W
        I103-1 (CANH) Y

        Airbag sensor assembly

        (for V bus)
        I103-2 (CANL) W
        I96-1 (CANH) L DLC3
        I96-2 (CANL) W
        I100-1 (CANH) G

        Power steering ECU with motor assembly

        (for V bus)
        I100-2 (CANL) W
        I94-1 (CANH) R

        Combination meter assembly

        (for V bus)
        I94-2 (CANL) W
        I93-1 (CANH) B

        CAN No. 2 junction connector

        (for V bus)
        I93-2 (CANL) W

        *1: w/ AFS

  2. CAN NO. 1 JUNCTION CONNECTOR (for RHD)


    1. Check the CAN No. 1 junction connector.

      Tech Tips

      Connectors that connect to the CAN junction connector can be distinguished by color of their CAN bus lines. When the connectors have been disconnected from the CAN junction connector, reconnecting the connectors to non-original positions on the CAN junction connector does not affect system performance. However, it is preferred to reconnect the connectors to their original positions to avoid negative effects on the wiring such as tension on the wiring harnesses, and to make future maintenance easier.


      1. Connection diagram

        A01EY7LE01
        Text in Illustration
        *a

        Component with harness connected

        (CAN No. 1 Junction Connector)

        		 *b

        to Main Body ECU (Multiplex Network Body ECU)

        (for V Bus)
        *c

        to Air Conditioning Amplifier Assembly

        (for V Bus)

        		 *d

        to Airbag Sensor Assembly

        (for V Bus)
        *e

        to Power Steering ECU with Motor Assembly

        (for V Bus)

        		 *f

        to ECM

        (for V Bus)
        *g

        to Radio and Display Receiver Assembly*1

        (for V Bus)

        		 *h

        to CAN No. 2 Junction Connector

        (for V Bus)

        *1: for Radio and display type

      2. Check the connection diagram of the components which are connected to the CAN No. 1 junction connector.

        Terminal No. (Symbol) Wiring Color Connected to
        I95-1 (CANH) P

        Main body ECU (Multiplex network body ECU)

        (for V bus)
        I95-2 (CANL) W
        I102-1 (CANH) V

        Air conditioning amplifier assembly

        (for V bus)
        I102-2 (CANL) W
        I103-1 (CANH) Y

        Airbag sensor assembly

        (for V bus)
        I103-2 (CANL) W
        I100-1 (CANH) L

        Power steering ECU with motor assembly

        (for V bus)
        I100-2 (CANL) W
        I104-1 (CANH) G

        ECM

        (for V bus)
        I104-2 (CANL) W
        I107-1 (CANH) R

        Radio and display receiver assembly*1

        (for V bus)
        I107-2 (CANL) W
        I93-1 (CANH) B

        CAN No. 2 junction connector

        (for V bus)
        I93-2 (CANL) W

        *1: for Radio and display type

  3. CAN NO. 2 JUNCTION CONNECTOR (for LHD)


    1. Check the CAN No. 2 junction connector.

      Tech Tips

      Connectors that connect to the CAN junction connector can be distinguished by color of their CAN bus lines. When the connectors have been disconnected from the CAN junction connector, reconnecting the connectors to non-original positions on the CAN junction connector does not affect system performance. However, it is preferred to reconnect the connectors to their original positions to avoid negative effects on the wiring such as tension on the wiring harnesses, and to make future maintenance easier.


      1. Connection diagram

        A01EVIIE01
        Text in Illustration
        *a

        Component with harness connected

        (CAN No. 2 Junction Connector)

        		 *b

        to Clearance Warning ECU Assembly*1

        (for V Bus)
        *c

        to ECM

        (for V Bus)

        		 *d

        to Air Conditioning Amplifier Assembly

        (for V Bus)
        *e

        to Brake Actuator Assembly

        (for V Bus)

        		 *f

        to Smart Key ECU Assembly (Certification ECU)*2

        (for V Bus)
        *g

        to Yaw Rate Sensor*5

        (for V Bus)

        		 *h

        • to Navigation ECU Sub-assembly*3

        • to Radio and Display Receiver Assembly*4

        (for V Bus)
        *i

        to CAN No. 1 Junction Connector

        (for V Bus)

        		 - -

        *1: w/ Toyota parking assist-sensor system

        *2: w/ Smart entry and start system

        *3: for Navigation receiver type

        *4: for Radio and display type

        *5: Separate type yaw rate sensor

      2. Check the connection diagram of the components which are connected to the CAN No. 2 junction connector.

        Terminal No. (Symbol) Wiring Color Connected to
        I111-1 (CANH) BE

        Clearance warning ECU assembly*1

        (for V bus)
        I111-2 (CANL) W
        I104-1 (CANH) P

        ECM

        (for V bus)
        I104-2 (CANL) W
        I102-1 (CANH) V

        Air conditioning amplifier assembly

        (for V bus)
        I102-2 (CANL) W
        I105-1 (CANH) Y

        Brake actuator assembly

        (for V bus)
        I105-2 (CANL) W
        I106-1 (CANH) L

        Smart key ECU assembly (Certification ECU)*2

        (for V bus)
        I106-2 (CANL) W
        I173-1 (CANH) G

        Yaw rate sensor*5

        (for V bus)
        I173-2 (CANL) W
        I107-1 (CANH) R

        • Navigation ECU sub-assembly*3

        • Radio and display receiver assembly*4

        (for V bus)
        I107-2 (CANL) W
        I101-1 (CANH) B

        CAN No. 1 junction connector

        (for V bus)
        I101-2 (CANL) W

        *1: w/ Toyota parking assist-sensor system

        *2: w/ Smart entry and start system

        *3: for Navigation receiver type

        *4: for Radio and display type

        *5: Separate type yaw rate sensor

  4. CAN NO. 2 JUNCTION CONNECTOR (for RHD)


    1. Check the CAN No. 2 junction connector.

      Tech Tips

      Connectors that connect to the CAN junction connector can be distinguished by color of their CAN bus lines. When the connectors have been disconnected from the CAN junction connector, reconnecting the connectors to non-original positions on the CAN junction connector does not affect system performance. However, it is preferred to reconnect the connectors to their original positions to avoid negative effects on the wiring such as tension on the wiring harnesses, and to make future maintenance easier.


      1. Connection diagram

        A01EVIIE01
        Text in Illustration
        *a

        Component with harness connected

        (CAN No. 2 Junction Connector)

        		 *b

        to Yaw Rate Sensor*2

        (for V Bus)
        *c

        to Clearance Warning ECU Assembly

        (for V Bus)

        		 *d

        to Steering Sensor

        (for V Bus)
        *e

        to Brake Actuator Assembly

        (for V Bus)

        		 *f

        to Smart Key ECU Assembly (Certification ECU)*1

        (for V Bus)
        *g DLC3 *h

        to Combination Meter Assembly

        (for V Bus)
        *i

        to CAN No. 1 Junction Connector

        (for V Bus)

        		 - -

        *1: w/ Smart entry and start system

        *2: Separate type yaw rate sensor

      2. Check the connection diagram of the components which are connected to the CAN No. 2 junction connector.

        Terminal No. (Symbol) Wiring Color Connected to
        I173-1 (CANH) BE

        Yaw rate sensor*2

        (for V bus)
        I173-2 (CANL) W
        I111-1 (CANH) P

        Clearance warning ECU assembly

        (for V bus)
        I111-2 (CANL) W
        I97-1 (CANH) V

        Steering sensor

        (for V bus)
        I97-2 (CANL) W
        I105-1 (CANH) Y

        Brake actuator assembly

        (for V bus)
        I105-2 (CANL) W
        I106-1 (CANH) L

        Smart key ECU assembly (Certification ECU)*1

        (for V bus)
        I106-2 (CANL) W
        I96-1 (CANH) G DLC3
        I96-2 (CANL) W
        I94-1 (CANH) R

        Combination meter assembly

        (for V bus)
        I94-2 (CANL) W
        I101-1 (CANH) B

        CAN No. 1 junction connector

        (for V bus)
        I101-2 (CANL) W

        *1: w/ Smart entry and start system

        *2: Separate type yaw rate sensor

  5. CAN NO. 3 JUNCTION CONNECTOR (w/ Power Tilt and Power Telescopic Steering Column System)


    1. Check the CAN No. 3 junction connector.

      Tech Tips

      Connectors that connect to the CAN junction connector can be distinguished by color of their CAN bus lines. When the connectors have been disconnected from the CAN junction connector, reconnecting the connectors to non-original positions on the CAN junction connector does not affect system performance. However, it is preferred to reconnect the connectors to their original positions to avoid negative effects on the wiring such as tension on the wiring harnesses, and to make future maintenance easier.


      1. Connection diagram

        A01EV6QE01
        Text in Illustration
        *A for TMC Made *B for TMMR Made
        *a

        Component with harness connected

        (CAN No. 3 Junction Connector)

        		 *b

        to Multiplex Tilt and Telescopic ECU

        (for Sub Bus 1)
        *c

        to Main Body ECU (Multiplex Network Body ECU)

        (for Sub Bus 1)

        		 *d

        to CAN No. 4 Junction Connector

        (for Sub Bus 1)

      2. Check the connection diagram of the components which are connected to the CAN No. 3 junction connector.

        Terminal No. (Symbol) Wiring Color Connected to
        I115-1 (CANH) B

        Multiplex tilt and telescopic ECU

        (for Sub bus 1)
        I115-2 (CANL) GR
        I114-1 (CANH) R

        Main body ECU (Multiplex network body ECU)

        (for Sub bus 1)
        I114-2 (CANL) GR
        I117-1 (CANH) Y

        CAN No. 4 junction connector

        (for Sub bus 1)
        I117-2 (CANL) GR

  6. CAN NO. 4 JUNCTION CONNECTOR (w/ Power Tilt and Power Telescopic Steering Column System)


    1. Check the CAN No. 4 junction connector.

      Tech Tips

      Connectors that connect to the CAN junction connector can be distinguished by color of their CAN bus lines. When the connectors have been disconnected from the CAN junction connector, reconnecting the connectors to non-original positions on the CAN junction connector does not affect system performance. However, it is preferred to reconnect the connectors to their original positions to avoid negative effects on the wiring such as tension on the wiring harnesses, and to make future maintenance easier.


      1. Connection diagram

        A01EVIZE01
        Text in Illustration
        *a

        Component with harness connected

        (CAN No. 4 Junction Connector)

        		 *b

        to CAN No. 5 Junction Connector

        (for Sub Bus 1)
        *c

        to CAN No. 3 Junction Connector

        (for Sub Bus 1)

        		 - -

      2. Check the connection diagram of the components which are connected to the CAN No. 4 junction connector.

        Terminal No. (Symbol) Wiring Color Connected to
        I121-1 (CANH) V

        CAN No. 5 junction connector

        (for Sub bus 1)
        I121-2 (CANL) GR
        I120-1 (CANH) Y

        CAN No. 3 junction connector

        (for Sub bus 1)
        I120-2 (CANL) GR

  7. CAN NO. 5 JUNCTION CONNECTOR (w/ Power Tilt and Power Telescopic Steering Column System)


    1. Check the CAN No. 5 junction connector.


      1. A01EU9PE18
        Text in Illustration
        *a

        Rear view of wire harness connector

        (to CAN No. 5 Junction Connector)
        *b

        to CAN No. 4 Junction Connector

        (for Sub Bus 1)

        Connection diagram

      2. Check the connection diagram of the components which are connected to the CAN No. 5 junction connector.

        Terminal No. (Symbol) Wiring Color Connected to
        I123-3 (CANH) V

        CAN No. 4 junction connector

        (for Sub bus 1)
        I123-2 (CANL) GR

  8. DLC3


    1. Disconnect the cable from the negative (-) battery terminal.

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

      A01EW15E16
      Text in Illustration
      *1 DLC3 - -

      *1: for LHD

      *2: for RHD

    3. ECM (for 2GR-FE)

      A01EU6WE25
      4. Text in Illustration
      *a

      Component without harness connected

      (ECM)

      		 - -

      1. Disconnect the cable from the negative (-) battery terminal.

      2. Disconnect the ECM connectors.

        A01EVGRE05
        Text in Illustration
        *a

        Front view of wire harness connector

        (to ECM)

        		 - -

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

      4. ECM (for 2AR-FE)

        A01EU6WE25
        5. Text in Illustration
        *a

        Component without harness connected

        (ECM)

        		 - -

    1. Disconnect the cable from the negative (-) battery terminal.

    2. Disconnect the ECM connectors.

      A01EVGRE06
      Text in Illustration
      *a

      Front view of wire harness connector

      (to ECM)

      		 - -

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

    4. COMBINATION METER ASSEMBLY

      A01EYZSE05
      5. Text in Illustration
      *a

      Component without harness connected

      (Combination Meter Assembly)

      		 - -

  1. Disconnect the cable from the negative (-) battery terminal.

  2. A01EWZEE18
    Text in Illustration
    *a

    Front view of wire harness connector

    (to Combination Meter Assembly)

    Disconnect the combination meter assembly connector.

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

  4. INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY AND MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)

    A01EVU3E09
    5. Text in Illustration
    *A for LHD *B for RHD
    *a

    Component without harness connected

    (Instrument Panel Junction Block Assembly and Main Body ECU (Multiplex Network Body ECU))

    		 - -

  1. Disconnect the cable from the negative (-) battery terminal.

  2. Disconnect the main body ECU (multiplex network body ECU) connectors.

    A01ET62E10
    Text in Illustration
    *1 DLC3 - -
    *a

    Front view of wire harness connector

    (to Main Body ECU (Multiplex Network Body ECU))

    		 - -

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

  4. BRAKE ACTUATOR ASSEMBLY

    A01EUYRE01
    5. Text in Illustration
    *a

    Component without harness connected

    (Brake Actuator Assembly)

    		 - -

    1. Disconnect the cable from the negative (-) battery terminal.

    2. A01EXFAE18
      Text in Illustration
      *a

      Front view of wire harness connector

      (to Brake Actuator Assembly)

      Disconnect the brake actuator assembly connector.

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

    4. STEERING SENSOR


      1. Disconnect the cable from the negative (-) battery terminal.

      2. A01EX21E53
      5. Text in Illustration
      *a

      Front view of wire harness connector

      (to Steering Sensor)

      Disconnect the steering sensor connector.

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

    6. YAW RATE SENSOR (SEPARATE TYPE YAW RATE SENSOR)


      1. Disconnect the cable from the negative (-) battery terminal.

      2. Disconnect the connector of the yaw rate sensor.

        A01EXMQE01
      7. Text in Illustration
      *1 DLC3 - -
      *a

      Front view of wire harness connector

      (to Yaw Rate Sensor)

      		 - -

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

      *1: for LHD

      *2: for RHD

    8. POWER STEERING ECU WITH MOTOR ASSEMBLY


      1. Disconnect the cable from the negative (-) battery terminal.

      2. Disconnect the power steering ECU with motor assembly connectors.

        A01EYXIE08
      9. Text in Illustration
      *a

      Component without harness connected

      (Power Steering ECU with Motor Assembly)

      		 - -
      A01EVFWE04
      Text in Illustration
      *a

      Front view of wire harness connector

      (to Power Steering ECU with Motor Assembly)

      		 - -

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

    10. AIRBAG SENSOR ASSEMBLY


      1. Disconnect the cable from the negative (-) battery terminal.

      2. Disconnect the airbag sensor assembly connector.

        A01EU2NE20
      11. Text in Illustration
      *1 DLC3 - -
      *a

      Front view of wire harness connector

      (to Airbag Sensor Assembly)

      		 - -

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

    12. SMART KEY ECU ASSEMBLY (CERTIFICATION ECU) (w/ Smart Entry and Start System)

      A01EWV5E22
      13. Text in Illustration
      *a

      Component without harness connected

      (Smart Key ECU Assembly (Certification ECU))

      		 - -

      1. Disconnect the cable from the negative (-) battery terminal.

      2. Disconnect the smart key ECU assembly (certification ECU) connector.

        A01EUOFE04
        Text in Illustration
        *a

        Rear view of wire harness connector

        (to Smart Key ECU Assembly (Certification ECU))

        		 - -

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

      4. RADIO AND DISPLAY RECEIVER ASSEMBLY (for Radio and Display Type)

        A01EY2GE11
        5. Text in Illustration
        *a

        Component without harness connected

        (Radio and Display Receiver Assembly)

        		 - -

        1. Disconnect the cable from the negative (-) battery terminal.

        2. Disconnect the radio and display receiver assembly connectors.

          A01EXP7E10
          Text in Illustration
          *a

          Front view of wire harness connector

          (to Radio and Display Receiver Assembly)

          		 - -

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

        4. NAVIGATION ECU SUB-ASSEMBLY (for Navigation Receiver Type)

          A01ET2EE07
          5. Text in Illustration
          *a

          Component without harness connected

          (Navigation ECU Sub-assembly)

          		 - -

          1. Disconnect the cable from the negative (-) battery terminal.

          2. Disconnect the navigation ECU sub-assembly connectors.

            A01EXP7E08
            Text in Illustration
            *a

            Front view of wire harness connector

            (to Navigation ECU Sub-assembly)

            		 - -

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

          4. AIR CONDITIONING AMPLIFIER ASSEMBLY


            1. Disconnect the cable from the negative (-) battery terminal.

            2. Disconnect the air conditioning amplifier assembly connector.

              A01EVWXE07
            5. Text in Illustration
            *a

            Component without harness connected

            (Air Conditioning Amplifier Assembly)

            		 - -
            A01EXONE31
            Text in Illustration
            *a

            Front view of wire harness connector

            (to Air Conditioning Amplifier Assembly)

            		 - -

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

          6. CLEARANCE WARNING ECU ASSEMBLY (w/ Toyota Parking Assist-sensor System)


            1. Disconnect the cable from the negative (-) battery terminal.

            2. Disconnect the clearance warning ECU assembly connector.

              A01EXF5E03
            7. Text in Illustration
            *1 DLC3 - -
            *a

            Front view of wire harness connector

            (to Clearance Warning ECU Assembly)

            		 - -

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

            *1: for LHD

            *2: for RHD

          8. AFS ECU (w/ AFS)

            A01ETNFE03
            9. Text in Illustration
            *a

            Component without harness connected

            (AFS ECU)

            		 - -

            1. Disconnect the cable from the negative (-) battery terminal.

            2. Disconnect the AFS ECU connector.

              A01EYDYE14
              Text in Illustration
              *1 DLC3 - -
              *a

              Front view of wire harness connector

              (to AFS ECU)

              		 - -

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

            4. MULTIPLEX TILT AND TELESCOPIC ECU (w/ Power Tilt and Power Telescopic Steering Column System)

              A01EUVAE03
              5. Text in Illustration
              *a

              Component without harness connected

              (Multiplex Tilt and Telescopic ECU)

              		 - -

              1. Disconnect the cable from the negative (-) battery terminal.

              2. Disconnect the multiplex tilt and telescopic ECU connector.

                A01EWRTE02
                Text in Illustration
                *a

                Front view of wire harness connector

                (to Multiplex Tilt and Telescopic ECU)

                		 - -

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