CAN COMMUNICATION SYSTEM TERMINALS OF ECU

Note


  • After turning the power 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 power switch off before measuring the resistances between CAN main bus lines and between CAN branch lines.

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

  • Before measuring the resistance of the CAN bus, turn the power switch off and leave the vehicle for 1 minute or more without operating the key or any switches, 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 power 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. NO. 1 CAN JUNCTION CONNECTOR (for LHD)


    1. Check the No. 1 CAN junction connector.


      1. A01SFJ3C07
        *a

        Front view of wire harness connector

        (to No. 1 CAN Junction Connector)
        *b

        to Hybrid Vehicle Control ECU Assembly

        (for Sub Bus 15)
        *c

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

        (for Sub Bus 15)
        *d

        to ECM

        (for Sub Bus 15)
        *e

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

        (for V Bus)
        *f

        to ECM

        (for V Bus)
        *g

        to No. 3 CAN Junction Connector

        (for V Bus)

        Connection diagram

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

        Terminal No. (Symbol) Wiring Color Connected to
        A32-1 (CANH) R

        Hybrid vehicle control ECU assembly

        (for Sub bus 15)
        A32-12 (CANL) SB
        A32-2 (CANH) G

        Skid control ECU (brake booster with master cylinder assembly)

        (for Sub bus 15)
        A32-13 (CANL) SB
        A32-3 (CANH) B

        ECM

        (for Sub bus 15)
        A32-14 (CANL) SB
        A32-9 (CANH) V

        Skid control ECU (brake booster with master cylinder assembly)

        (for V bus)
        A32-20 (CANL) W
        A32-10 (CANH) B

        ECM

        (for V bus)
        A32-21 (CANL) W
        A32-11 (CANH) L

        No. 3 CAN junction connector

        (for V bus)
        A32-22 (CANL) W

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


    1. Check the No. 1 CAN junction connector.


      1. A01SFJ3C07
        *a

        Front view of wire harness connector

        (to No. 1 CAN Junction Connector)
        *b

        to Hybrid Vehicle Control ECU Assembly

        (for Sub Bus 15)
        *c

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

        (for Sub Bus 15)
        *d

        to ECM

        (for Sub Bus 15)
        *e

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

        (for V Bus)
        *f

        to ECM

        (for V Bus)
        *g

        to No. 3 CAN Junction Connector

        (for V Bus)

        Connection diagram

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

        Terminal No. (Symbol) Wiring Color Connected to
        A32-1 (CANH) R

        Hybrid vehicle control ECU assembly

        (for Sub bus 15)
        A32-12 (CANL) SB
        A32-2 (CANH) G

        Skid control ECU (brake booster with master cylinder assembly)

        (for Sub bus 15)
        A32-13 (CANL) SB
        A32-3 (CANH) B

        ECM

        (for Sub bus 15)
        A32-14 (CANL) SB
        A32-9 (CANH) V

        Skid control ECU (brake booster with master cylinder assembly)

        (for V bus)
        A32-20 (CANL) W
        A32-10 (CANH) B

        ECM

        (for V bus)
        A32-21 (CANL) W
        A32-11 (CANH) L

        No. 3 CAN junction connector

        (for V bus)
        A32-22 (CANL) W

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


    1. Check the No. 2 CAN junction connector.


      1. Connection diagram

      2. A01SFJ3C09
        *a

        Front view of wire harness connector

        (to No. 2 CAN Junction Connector)
        *b

        to No. 3 CAN Junction Connector

        (for V Bus)
        *c

        to Airbag Sensor Assembly

        (for V Bus)
        *d

        to Power Steering ECU Assembly

        (for V Bus)
        *e

        to Certification ECU (Smart Key ECU Assembly)

        (for V Bus)
        *f

        to Combination Meter Assembly

        (for V Bus)
        *g

        to Hybrid Vehicle Control ECU Assembly

        (for V Bus)
        *h

        to Radio and Display Receiver Assembly

        (for Radio and Display Type)

        (for V Bus)
        *i

        to Air Conditioning Amplifier Assembly

        (for V Bus)
        *j

        to Transmission Control ECU Assembly

        (for V Bus)

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

        Terminal No. (Symbol) Wiring Color Connected to
        E118-1 (CANH) R

        No. 3 CAN junction connector

        (for V bus)
        E118-12 (CANL) W
        E118-2 (CANH) V

        Airbag sensor assembly

        (for V bus)
        E118-13 (CANL) W
        E118-5 (CANH) GR

        Power steering ECU assembly

        (for V bus)
        E118-16 (CANL) W
        E118-6 (CANH) L

        Certification ECU (smart key ECU assembly)

        (for V bus)
        E118-17 (CANL) W
        E118-7 (CANH) LG

        Combination meter assembly

        (for V bus)
        E118-18 (CANL) W
        E118-8 (CANH) P

        Hybrid vehicle control ECU assembly

        (for V bus)
        E118-19 (CANL) W
        E118-9 (CANH) G

        Radio and display receiver assembly*

        (for V bus)
        E118-20 (CANL) W
        E118-10 (CANH) Y

        Air conditioning amplifier assembly

        (for V bus)
        E118-21 (CANL) W
        E118-11 (CANH) B

        Transmission control ECU assembly

        (for V bus)
        E118-22 (CANL) W

        *: for Radio and Display Type

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


    1. Check the No. 2 CAN junction connector.


      1. Connection diagram

      2. A01SFCUC01
        *a

        Front view of wire harness connector

        (to No. 2 CAN Junction Connector)
        *b

        to No. 3 CAN Junction Connector

        (for V Bus)
        *c

        to Airbag Sensor Assembly

        (for V Bus)
        *d

        to Transmission Control ECU Assembly

        (for V Bus)
        *e

        to Power Steering ECU Assembly

        (for V Bus)
        *f

        to Certification ECU (Smart Key ECU Assembly)

        (for V Bus)
        *g

        to Combination Meter Assembly

        (for V Bus)
        *h

        to DLC3

        (for V Bus)
        *i

        to Radio and Display Receiver Assembly

        (for Radio and Display Type)

        (for V Bus)
        *j

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

        (for V Bus)

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

        Terminal No. (Symbol) Wiring Color Connected to
        E118-1 (CANH) R

        No. 3 CAN junction connector

        (for V bus)
        E118-12 (CANL) W
        E118-3 (CANH) V

        Airbag sensor assembly

        (for V bus)
        E118-14 (CANL) W
        E118-4 (CANH) B

        Transmission control ECU assembly

        (for V bus)
        E118-15 (CANL) W
        E118-5 (CANH) GR

        Power steering ECU assembly

        (for V bus)
        E118-16 (CANL) W
        E118-6 (CANH) L

        Certification ECU (smart key ECU assembly)

        (for V bus)
        E118-17 (CANL) W
        E118-7 (CANH) LG

        Combination meter assembly

        (for V bus)
        E118-18 (CANL) W
        E118-8 (CANH) BE

        DLC3

        (for V bus)
        E118-19 (CANL) W
        E118-9 (CANH) G

        Radio and display receiver assembly*

        (for V bus)
        E118-20 (CANL) W
        E118-11 (CANH) SB

        Steering sensor (spiral cable with sensor sub-assembly)

        (for V bus)
        E118-22 (CANL) W

        *: for Radio and Display Type

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


    1. Check the No. 3 CAN junction connector.


      1. Connection diagram

      2. A01SFCUC06
        *a

        Front view of wire harness connector

        (to No. 3 CAN Junction Connector)
        *b

        to No. 1 CAN Junction Connector

        (for V Bus)
        *c

        to DLC3

        (for V Bus)
        *d

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

        (for V Bus)
        *e

        to Main Body ECU (Multiplex Network Body ECU)

        (for V Bus)
        *f

        to No. 2 CAN Junction Connector

        (for V Bus)
        *g

        to Pre-crash Safety City Sensor

        (w/ Toyota Safety Sense)

        (for V Bus)
        *h

        to No. 1 CAN Junction Terminal

        (w/ Automatic Headlight Beam Level Control System or Simple Intelligent Parking Assist System)

        (for Sub Bus 3)
        *i

        to Headlight Swivel ECU Assembly

        (w/ Automatic Headlight Beam Level Control System)

        (for Sub Bus 3)
        *j

        to Clearance Warning ECU Assembly

        (w/ Simple Intelligent Parking Assist System)

        (for Sub Bus 3)
        *k

        to Hybrid Vehicle Control ECU Assembly

        (w/ Automatic Headlight Beam Level Control System or Simple Intelligent Parking Assist System)

        (for Sub Bus 3)

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

        Terminal No. (Symbol) Wiring Color Connected to
        E119-1 (CANH) L

        No. 1 CAN junction connector

        (for V bus)
        E119-12 (CANL) W
        E119-2 (CANH) BE

        DLC3

        (for V bus)
        E119-13 (CANL) W
        E119-3 (CANH) SB

        Steering sensor (spiral cable with sensor sub-assembly)

        (for V bus)
        E119-14 (CANL) W
        E119-4 (CANH) G

        Main body ECU (multiplex network body ECU)

        (for V bus)
        E119-15 (CANL) W
        E119-5 (CANH) R

        No. 2 CAN junction connector

        (for V bus)
        E119-16 (CANL) W
        E119-6 (CANH) P

        Pre-crash safety city sensor*1

        (for V bus)
        E119-17 (CANL) W
        E119-8 (CANH) L

        No. 1 CAN junction terminal*4

        (for Sub bus 3)
        E119-19 (CANL) LG
        E119-9 (CANH) G

        Headlight swivel ECU assembly*2

        (for Sub bus 3)
        E119-20 (CANL) LG
        E119-10 (CANH) R

        Clearance warning ECU assembly*3

        (for Sub bus 3)
        E119-21 (CANL) LG
        E119-11 (CANH) B

        Hybrid vehicle control ECU assembly*4

        (for Sub bus 3)
        E119-22 (CANL) LG

        • *1: w/ Toyota Safety Sense

        • *2: w/ Automatic Headlight Beam Level Control System

        • *3: w/ Simple Intelligent Parking Assist System

        • *4: w/ Automatic Headlight Beam Level Control System or Simple Intelligent Parking Assist System

  6. NO. 3 CAN JUNCTION CONNECTOR (for RHD)


    1. Check the No. 3 CAN junction connector.


      1. Connection diagram

      2. A01SFCUC07
        *a

        Front view of wire harness connector

        (to No. 3 CAN Junction Connector)
        *b

        to No. 1 CAN Junction Connector

        (for V Bus)
        *c

        to Main Body ECU (Multiplex Network Body ECU)

        (for V Bus)
        *d

        to Hybrid Vehicle Control ECU Assembly

        (for V Bus)
        *e

        to Air Conditioning Amplifier Assembly

        (for V Bus)
        *f

        to No. 2 CAN Junction Connector

        (for V Bus)
        *g

        to Pre-crash Safety City Sensor

        (w/ Toyota Safety Sense)

        (for V Bus)
        *h

        to No. 1 CAN Junction Terminal

        (w/ Automatic Headlight Beam Level Control System or Simple Intelligent Parking Assist System)

        (for Sub Bus 3)
        *i

        to Headlight Swivel ECU Assembly

        (w/ Automatic Headlight Beam Level Control System)

        (for Sub Bus 3)
        *j

        to Clearance Warning ECU Assembly

        (w/ Simple Intelligent Parking Assist System)

        (for Sub Bus 3)
        *k

        to Hybrid Vehicle Control ECU Assembly

        (w/ Automatic Headlight Beam Level Control System or Simple Intelligent Parking Assist System)

        (for Sub Bus 3)

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

        Terminal No. (Symbol) Wiring Color Connected to
        E119-1 (CANH) L

        No. 1 CAN junction connector

        (for V bus)
        E119-12 (CANL) W
        E119-2 (CANH) G

        Main body ECU (multiplex network body ECU)

        (for V bus)
        E119-13 (CANL) W
        E119-3 (CANH) P

        Hybrid vehicle control ECU assembly

        (for V bus)
        E119-14 (CANL) W
        E119-4 (CANH) Y

        Air conditioning amplifier assembly

        (for V bus)
        E119-15 (CANL) W
        E119-5 (CANH) R

        No. 2 CAN junction connector

        (for V bus)
        E119-16 (CANL) W
        E119-6 (CANH) P

        Pre-crash safety city sensor*1

        (for V bus)
        E119-17 (CANL) W
        E119-8 (CANH) L

        No. 1 CAN junction terminal*4

        (for Sub bus 3)
        E119-19 (CANL) LG
        E119-9 (CANH) G

        Headlight swivel ECU assembly*2

        (for Sub bus 3)
        E119-20 (CANL) LG
        E119-10 (CANH) R

        Clearance warning ECU assembly*3

        (for Sub bus 3)
        E119-21 (CANL) LG
        E119-11 (CANH) B

        Hybrid vehicle control ECU assembly*4

        (for Sub bus 3)
        E119-22 (CANL) LG

        • *1: w/ Toyota Safety Sense

        • *2: w/ Automatic Headlight Beam Level Control System

        • *3: w/ Simple Intelligent Parking Assist System

        • *4: w/ Automatic Headlight Beam Level Control System or Simple Intelligent Parking Assist System

  7. NO. 1 CAN JUNCTION TERMINAL (w/ Automatic Headlight Beam Level Control System or Simple Intelligent Parking Assist System)


    1. Check the No. 1 CAN junction terminal.


      1. A01SFDAC04
        *a

        Front view of wire harness connector

        (to No. 1 CAN Junction Terminal)
        *b

        to No. 3 CAN Junction Connector

        (for Sub Bus 3)

        Connection diagram

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

        Terminal No. (Symbol) Wiring Color Connected to
        E120-3 (CANH) L

        No. 3 CAN junction connector

        (for Sub bus 3)
        E120-2 (CANL) LG

  8. DLC3


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

    2. A01SF6PC97
      *1 DLC3

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

    3. HYBRID VEHICLE CONTROL ECU ASSEMBLY


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

      2. A01SFNJC84
      4. *a

      Rear view of wire harness connector

      (to Hybrid Vehicle Control ECU Assembly)

Disconnect the E136 hybrid vehicle control ECU assembly connector.

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

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

  • A01SFEVC11
    • *a

    Rear view of wire harness connector

    (to Hybrid Vehicle Control ECU Assembly)

    Disconnect the E135 hybrid vehicle control ECU assembly connector.

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

  • ECM

    A01SFR0C03
    • *a

    Component without harness connected

    (ECM)

    		 - -

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

    2. Disconnect the A142 and B178 ECM connectors.

      A01SFIUC25
      *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


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

      2. A01SFE9C05
      5. *a

      Front view of wire harness connector

      (to Combination Meter Assembly)

      Disconnect the E46 combination meter assembly connector.

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

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

      A01SFFQC67
      7. *A Main Body ECU (Multiplex Network Body ECU) with 1 Connector - -
      *1 Main Body ECU (Multiplex Network Body ECU) - -
      *a

      Component without harness connected

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

      		 *b 1 Connector
      A01SFARC64
      *A Main Body ECU (Multiplex Network Body ECU) with 2 Connectors - -
      *1 Main Body ECU (Multiplex Network Body ECU) - -
      *a

      Component without harness connected

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

      		 *b 2 Connectors

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

      2. Disconnect the E22 main body ECU (multiplex network body ECU) connector.

        A01SFA2C03
        *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. SKID CONTROL ECU (BRAKE BOOSTER WITH MASTER CYLINDER ASSEMBLY)


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

        2. A01SFF2C01
        5. *a

        Front view of wire harness connector

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

        Disconnect the A144 skid control ECU (brake booster with master cylinder assembly) connector.

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

      6. TRANSMISSION CONTROL ECU ASSEMBLY

        A01SFGAC03
        7. *a

        Component without harness connected

        (Transmission Control ECU Assembly)

        		 - -

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

        2. Disconnect the A131 and A132 transmission control ECU assembly connectors.

          A01SFQLC02
          *a

          Front view of wire harness connector

          (to Transmission Control ECU Assembly)

          		 - -

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

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


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

          2. A01SFLDC01
          5. *a

          Front view of wire harness connector

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

          Disconnect the E19 steering sensor (spiral cable with sensor sub-assembly) connector.

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

        6. POWER STEERING ECU ASSEMBLY

          A01SFIAC06
          7. *a

          Component without harness connected

          (Power Steering ECU Assembly)

          		 - -

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

          2. Disconnect the A53 and E30 power steering ECU assembly connectors.

            A01SFOXC02
            *1 DLC3 - -
            *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. AIRBAG SENSOR ASSEMBLY

            A01SFJXC09
            5. *a

            Component without harness connected

            (Airbag Sensor Assembly)

            		 - -

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

            2. Disconnect the E14 airbag sensor assembly connector.

              A01SFHSC38
              *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. CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)

              A01SFJ2C15
              5. *a

              Component without harness connected

              (Certification ECU (Smart Key ECU Assembly))

              		 - -

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

              2. Disconnect the E33 and E35 certification ECU (smart key ECU assembly) connectors.

                A01SFBLC01
                *a

                Rear view of wire harness connector

                (to Certification ECU (Smart Key ECU Assembly))

                		 - -

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

              4. RADIO AND DISPLAY RECEIVER ASSEMBLY (for Radio and Display Type) (w/o Navigation System)

                A01SFB8C47
                5. *a

                Component without harness connected

                (Radio and Display Receiver Assembly)

                		 - -

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

                2. Disconnect the E1 and E60 radio and display receiver assembly connectors.

                  A01SF7ZC55
                  *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. RADIO AND DISPLAY RECEIVER ASSEMBLY (for Radio and Display Type) (w/ Navigation System)

                  A01SFRUC04
                  5. *a

                  Component without harness connected

                  (Radio and Display Receiver Assembly)

                  		 - -

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

                  2. Disconnect the E1 and E60 radio and display receiver assembly connectors.

                    A01SF7ZC56
                    *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. AIR CONDITIONING AMPLIFIER ASSEMBLY


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

                    2. A01SFPEC26
                    5. *a

                    Front view of wire harness connector

                    (to Air Conditioning Amplifier Assembly)

                    Disconnect the E28 air conditioning amplifier assembly connector.

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

                  6. CLEARANCE WARNING ECU ASSEMBLY (w/ Simple Intelligent Parking Assist System)

                    A01SFURC02
                    7. *a

                    Component without harness connected

                    (Clearance Warning ECU Assembly)

                    		 - -

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

                    2. Disconnect the E98 clearance warning ECU assembly connector.

                      A01SFQJC19
                      *1 DLC3 - -
                      *a

                      Front view of wire harness connector

                      (to Clearance Warning ECU Assembly)

                      		 - -

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

                    4. HEADLIGHT SWIVEL ECU ASSEMBLY (w/ Automatic Headlight Beam Level Control System)


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

                      2. A01SFQBC04
                      5. *1 DLC3
                      *a

                      Front view of wire harness connector

                      (to Headlight Swivel ECU Assembly)

                      Disconnect the A93 headlight swivel ECU assembly connector.

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

                    6. PRE-CRASH SAFETY CITY SENSOR (w/ Toyota Safety Sense)


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

                      2. A01SFGCC01
                      7. *1 DLC3
                      *a

                      Front view of wire harness connector

                      (to Pre-crash Safety City Sensor)

                      Disconnect the O9 precrash safety city sensor connector.

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