CAN COMMUNICATION SYSTEM(w/o Toyota Safety Sense) TERMINALS OF ECU

Note


  • After turning the ignition switch off, waiting time may be required before disconnecting the cable from the negative (-) auxiliary battery terminal. Therefore, make sure to read the disconnecting the cable from the negative (-) auxiliary 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 (-) auxiliary 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 JUNCTION CONNECTOR LH (for LHD)

    Tech Tips

    The following tables contain information about the items and buses connected via junction connectors. The junction connector may be used for multiple separate buses. In this case, the name of the bus will be shown below the name of the item that the terminals are connected to. The bus name will be shown in brackets (example: (for Sub bus 15)).


    1. Check the CAN junction connector LH (instrument panel wire side) (for V bus).


      1. Connection diagram

        A01UXY9E01
        Text in Illustration
        *a

        Front view of wire harness connector

        (to CAN Junction Connector LH (Instrument Panel Wire Side))

        		 *b

        to Main Body ECU (Multiplex Network Body ECU)

        (for V Bus)
        *c to DLC3 *d

        to CAN Junction Connector RH

        (for V Bus)
        *e

        to Hybrid Vehicle Control ECU

        (for V Bus)

        		 - -

      2. Check the connection diagram of the components which are connected to the CAN junction connector LH.

        Terminal No. (Symbol) Wiring Color Connected to
        F62-1 (CANH) R

        Main body ECU (Multiplex network body ECU)

        (for V bus)
        F62-12 (CANL) W
        F62-3 (CANH) GR DLC3
        F62-14 (CANL) W
        F62-4 (CANH) SB

        CAN junction connector RH

        (for V bus)
        F62-15 (CANL) W
        F62-5 (CA1H) BE

        Hybrid vehicle control ECU

        (for V bus)
        F62-16 (CA1L) W

    2. Check the CAN junction connector LH (engine room main wire side) (for V bus).


      1. Connection diagram

        A01V1PCE01
        Text in Illustration
        *a

        Front view of wire harness connector

        (to CAN Junction Connector LH (Engine Room Main Wire Side))

        		 *b

        to ECM

        (for V Bus)
        *c

        to Brake Booster with Master Cylinder Assembly (Skid Control ECU)

        (for V Bus)

        		 - -

      2. Check the connection diagram of the components which are connected to the CAN junction connector LH.

        Terminal No. (Symbol) Wiring Color Connected to
        A34-9 (CANH) L

        ECM

        (for V bus)
        A34-20 (CANL) W
        A34-10 (CA1H) B

        Brake booster with master cylinder assembly (Skid control ECU)

        (for V bus)
        A34-21 (CA1L) W

  2. CAN JUNCTION CONNECTOR LH (for RHD)

    Tech Tips

    The following tables contain information about the items and buses connected via junction connectors. The junction connector may be used for multiple separate buses. In this case, the name of the bus will be shown below the name of the item that the terminals are connected to. The bus name will be shown in brackets (example: (for Sub bus 15)).


    1. Check the CAN junction connector LH (instrument panel wire side) (for V bus).


      1. Connection diagram

        A01UZE3E01
        Text in Illustration
        *a

        Front view of wire harness connector

        (to CAN Junction Connector LH (Instrument Panel Wire Side))

        		 *b

        to Main Body ECU (Multiplex Network Body ECU)

        (for V Bus)
        *c

        to CAN Junction Connector RH

        (for V Bus)

        		 *d

        to Hybrid Vehicle Control ECU

        (for V Bus)

      2. Check the connection diagram of the components which are connected to the CAN junction connector LH.

        Terminal No. (Symbol) Wiring Color Connected to
        F62-1 (CANH) R

        Main body ECU (Multiplex network body ECU)

        (for V bus)
        F62-12 (CANL) W
        F62-4 (CANH) SB

        CAN junction connector RH

        (for V bus)
        F62-15 (CANL) W
        F62-5 (CA1H) BE

        Hybrid vehicle control ECU

        (for V bus)
        F62-16 (CA1L) W

    2. Check the CAN junction connector LH (engine room main wire side) (for V bus).


      1. Connection diagram

        A01UYEME01
        Text in Illustration
        *a

        Front view of wire harness connector

        (to CAN Junction Connector LH (Engine Room Main Wire Side))

        		 *b

        to ECM

        (for V Bus)
        *c

        to Brake Booster with Master Cylinder Assembly (Skid Control ECU)

        (for V Bus)

        		 - -

      2. Check the connection diagram of the components which are connected to the CAN junction connector LH.

        Terminal No. (Symbol) Wiring Color Connected to
        A34-9 (CANH) L

        ECM

        (for V bus)
        A34-20 (CANL) W
        A34-10 (CA1H) B

        Brake booster with master cylinder assembly (Skid control ECU)

        (for V bus)
        A34-21 (CA1L) W

  3. CAN JUNCTION CONNECTOR RH (for LHD)


    1. Check the CAN junction connector RH (for V bus).


      1. Connection diagram

        A01UZJYE01
        Text in Illustration
        *a

        Front view of wire harness connector

        (to CAN Junction Connector RH)

        		 *b

        to Spiral Cable with Sensor Sub-assembly (Steering Sensor)

        (for V Bus)
        *c

        to Smart Key ECU Assembly (Certification ECU)*1

        (for V Bus)

        		 *d

        to Airbag Sensor Assembly

        (for V Bus)
        *e

        to Radio and Display Receiver Assembly*2

        (for V Bus)

        		 *f

        to Combination Meter Assembly

        (for V Bus)
        *g

        to Air Conditioning Amplifier Assembly

        (for V Bus)

        		 *h

        to CAN Junction Connector LH

        (for V Bus)
        *i

        to Power Steering ECU Assembly

        (for V Bus)

        		 - -

        • *1: w/ Power Switch

        • *2: w/ Display

      2. Check the connection diagram of the components which are connected to the CAN junction connector RH.

        Terminal No. (Symbol) Wiring Color Connected to
        F63-1 (CANH) P

        Spiral cable with sensor sub-assembly (Steering sensor)

        (for V bus)
        F63-12 (CANL) W
        F63-3 (CANH) L

        Smart key ECU assembly (Certification ECU)*1

        (for V bus)
        F63-14 (CANL) W
        F63-4 (CANH) B

        Airbag sensor assembly

        (for V bus)
        F63-15 (CANL) W
        F63-5 (CANH) BE

        Radio and display receiver assembly*2

        (for V bus)
        F63-16 (CANL) W
        F63-7 (CANH) G

        Combination meter assembly

        (for V bus)
        F63-18 (CANL) W
        F63-8 (CANH) V

        Air conditioning amplifier assembly

        (for V bus)
        F63-19 (CANL) W
        F63-10 (CANH) SB

        CAN junction connector LH

        (for V bus)
        F63-21 (CANL) W
        F63-6 (CANH) LG

        Power Steering ECU Assembly

        (for V Bus)
        F63-17 (CANL) W

        • *1: w/ Power Switch

        • *2: w/ Display

  4. CAN JUNCTION CONNECTOR RH (for RHD)


    1. Check the CAN junction connector RH (for V bus).


      1. Connection diagram

        A01V19FE01
        Text in Illustration
        *a

        Front view of wire harness connector

        (to CAN Junction Connector RH)

        		 *b

        to Spiral Cable with Sensor Sub-assembly (Steering Sensor)

        (for V Bus)
        *c

        to Smart Key ECU Assembly (Certification ECU)*1

        (for V Bus)

        		 *d

        to Airbag Sensor Assembly

        (for V Bus)
        *e

        to Radio and Display Receiver Assembly*2

        (for V Bus)

        		 *f

        to Power Steering ECU Assembly

        (for V Bus)
        *g

        to Combination Meter Assembly

        (for V Bus)

        		 *h

        to Air Conditioning Amplifier Assembly

        (for V Bus)
        *i

        to CAN Junction Connector LH

        (for V Bus)

        		 *j to DLC3

        • *1: w/ Power Switch

        • *2: w/ Display

      2. Check the connection diagram of the components which are connected to the CAN junction connector RH.

        Terminal No. (Symbol) Wiring Color Connected to
        F63-1 (CANH) P

        Spiral cable with sensor sub-assembly (Steering sensor)

        (for V bus)
        F63-12 (CANL) W
        F63-3 (CANH) L

        Smart key ECU assembly (Certification ECU)*1

        (for V bus)
        F63-14 (CANL) W
        F63-4 (CANH) B

        Airbag sensor assembly

        (for V bus)
        F63-15 (CANL) W
        F63-5 (CANH) BE

        Radio and display receiver assembly*2

        (for V bus)
        F63-16 (CANL) W
        F63-6 (CANH) LG

        Power steering ECU assembly

        (for V bus)
        F63-17 (CANH) W
        F63-7 (CANH) G

        Combination meter assembly

        (for V bus)
        F63-18 (CANL) W
        F63-8 (CANH) V

        Air conditioning amplifier assembly

        (for V bus)
        F63-19 (CANL) W
        F63-10 (CANH) SB

        CAN junction connector LH

        (for V bus)
        F63-21 (CANL) W
        F63-11 (CANH) GR DLC3
        F63-22 (CANL) W

        • *1: w/ Power Switch

        • *2: w/ Display

  5. CAN JUNCTION CONNECTOR LH


    1. Check the CAN junction connector LH (engine room main wire side) (for Sub bus 15).


      1. Connection diagram

        A01UXQIE01
        Text in Illustration
        *a

        Front view of wire harness connector

        (to CAN Junction Connector LH (Engine Room Main Wire Side))

        		 *b

        to Brake Booster with Master Cylinder Assembly (Skid Control ECU)

        (for Sub Bus 15)
        *c

        to ECM

        (for Sub Bus 15)

        		 - -

      2. Check the connection diagram of the components which are connected to the CAN junction connector LH.

        Terminal No. (Symbol) Wiring Color Connected to
        A34-1 (CA2H) L

        Brake booster with master cylinder assembly (Skid control ECU)

        (for Sub bus 15)
        A34-12 (CA2L) W
        A34-3 (CANP) B*1, G*2

        ECM

        (for Sub bus 15)
        A34-14 (CANN) W

        • *1: for LHD

        • *2: for RHD

    2. Check the CAN junction connector LH (instrument panel wire side) (for Sub bus 15).


      1. Connection diagram

        A01UZA1E01
        Text in Illustration
        *a

        Front view of wire harness connector

        (to CAN Junction Connector LH (Instrument Panel Wire Side))

        		 *b

        to Hybrid Vehicle Control ECU

        (for Sub Bus 15)

      2. Check the connection diagram of the components which are connected to the CAN junction connector LH.

        Terminal No. (Symbol) Wiring Color Connected to
        F62-10 (CA3P) Y

        Hybrid vehicle control ECU

        (for Sub bus 15)
        F62-21 (CA3N) W

  6. DLC3


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

    2. A01UZFIE01
      Text in Illustration
      *1 DLC3

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

    3. HYBRID VEHICLE CONTROL ECU

      A01V03FE04
      4. Text in Illustration
      *a

      Component without harness connected

      (Hybrid Vehicle Control ECU)

      		 - -

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

      2. A01UZKTE01
        Text in Illustration
        *a

        Rear view of wire harness connector

        (to Hybrid Vehicle Control ECU)

        Disconnect the hybrid vehicle control ECU connectors.

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

      4. ECM

        A01UXGWE04
        5. Text in Illustration
        *A for LHD *B for RHD
        *a

        Component without harness connected

        (ECM)

        		 - -

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

  2. Disconnect the ECM connectors.

    A01V19SE01
    Text in Illustration
    *A for LHD *B for RHD
    *a

    Front view of wire harness connector

    (to ECM)

    		 - -

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

    *1: for LHD

    *2: for RHD

    *1: for LHD

    *2: for RHD

  4. BRAKE BOOSTER WITH MASTER CYLINDER ASSEMBLY (SKID CONTROL ECU)

    A01UYYVE01
    5. Text in Illustration
    *a

    Component without harness connected

    (Brake Booster with Master Cylinder Assembly (Skid Control ECU))

    		 - -

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

  2. A01V1WHE01
    Text in Illustration
    *a

    Front view of wire harness connector

    (to Brake Booster with Master Cylinder Assembly (Skid Control ECU))

    Disconnect the brake booster with master cylinder assembly (skid control ECU) connector.

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

  4. AIRBAG SENSOR ASSEMBLY

    A01V23QE01
    5. Text in Illustration
    *a

    Component without harness connected

    (Airbag Sensor Assembly)

    		 - -

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

    2. Disconnect the airbag sensor assembly connector.

      A01V1KSE01
      Text in Illustration
      *1 DLC3 - -
      *a

      Front view of wire harness connector

      (to Airbag Sensor Assembly)

      		 - -

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

    4. MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)

      A01V1E0E01
      5. Text in Illustration
      *1 Main Body ECU (Multiplex Network Body ECU) - -
      *a

      Component without harness connected

      (Main body ECU (Multiplex Network Body ECU))

      		 - -

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

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

        A01UZGQE02
        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. SPIRAL CABLE WITH SENSOR SUB-ASSEMBLY (STEERING SENSOR)


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

        2. A01UXM2E01
        5. Text in Illustration
        *a

        Front view of wire harness connector

        (to Spiral Cable with Sensor Sub-assembly (Steering Sensor))

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

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

      6. POWER STEERING ECU ASSEMBLY

        A01V0BGE02
        7. Text in Illustration
        *a

        Component without harness connected

        (Power Steering ECU Assembly)

        		 - -

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

        2. Disconnect the power steering ECU assembly connectors.

          A01V1WGE03
          Text in Illustration
          *a

          Front view of wire harness connector

          (to Power Steering ECU Assembly)

          		 - -

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

        4. SMART KEY ECU ASSEMBLY (CERTIFICATION ECU) (w/ Power Switch)

          A01V05JE01
          5. Text in Illustration
          *a

          Component without harness connected

          (Smart Key ECU Assembly (Certification ECU))

          		 - -

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

          2. A01UZNLE02
            Text in Illustration
            *a

            Front view of wire harness connector

            (to Smart Key ECU Assembly (Certification ECU))

            Disconnect the smart key ECU assembly (certification ECU) connectors.

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

          4. COMBINATION METER ASSEMBLY

            A01UXY8E01
            5. Text in Illustration
            *a

            Component without harness connected

            (Combination Meter Assembly)

            		 - -

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

            2. A01UZFJE01
              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. AIR CONDITIONING AMPLIFIER ASSEMBLY

              A01V1DQE03
              5. Text in Illustration
              *a

              Component without harness connected

              (Air Conditioning Amplifier Assembly)

              		 - -

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

              2. A01V0GDE01
                Text in Illustration
                *a

                Front view of wire harness connector

                (to Air Conditioning Amplifier Assembly)

                Disconnect the air conditioning amplifier assembly connector.

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

              4. RADIO AND DISPLAY RECEIVER ASSEMBLY (w/ Display)

                A01V11EE04
                5. Text in Illustration
                *a

                Component without harness connected

                (Radio and Display Receiver Assembly)

                		 - -

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

                2. A01V1L4E01
                  Text in Illustration
                  *a

                  Front view of wire harness connector

                  (to Radio and Display Receiver Assembly)

                  Disconnect the radio and display receiver assembly connectors.

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