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

  • 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, 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


  • The systems (ECUs and sensors) that use CAN communication vary depending on the vehicle and optional equipment. Check which systems (ECUs and sensors) are installed to the vehicle.

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  • 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 (w/o Occupant Classification System)


    1. Check the No. 1 CAN junction connector.


      1. Connection diagram

        B004QOIC12
        *a

        Front view of wire harness connector

        (to No. 1 CAN Junction Connector)

        		 *b

        to Swing Grille Actuator Assembly

        (w/ Grille Shutter System)
        *c

        to Clearance Warning ECU Assembly

        (w/ Simple Intelligent Parking Assist System)

        		 *d

        to Forward Recognition Camera

        (w/ Toyota Safety Sense)
        *e

        to Millimeter Wave Radar Sensor Assembly

        (w/ Toyota Safety Sense)

        		 *f

        to Driving Support ECU Assembly

        (w/ Toyota Safety Sense)
        *g to No. 7 CAN Junction Connector *h to Central Gateway ECU (Network Gateway ECU)

      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
        F68-2 (CANH) B

        Swing grille actuator assembly*1

        (for Bus 1)
        F68-12 (CANL) W
        F68-3 (CANH) LG

        Clearance warning ECU assembly*2

        (for Bus 1)
        F68-13 (CANL) W
        F68-4 (CANH) R

        Forward recognition camera*3

        (for Bus 1)
        F68-14 (CANL) W
        F68-5 (CANH) BE

        Millimeter wave radar sensor assembly*3

        (for Bus 1)
        F68-15 (CANL) W
        F68-6 (CANH) G

        Driving support ECU assembly*3

        (for Bus 1)
        F68-16 (CANL) W
        F68-7 (CANH) BE

        No. 7 CAN junction connector

        (for Bus 1)
        F68-17 (CANL) W
        F68-8 (CANH) SB

        Central gateway ECU (network gateway ECU)

        (for Bus 1)
        F68-18 (CANL) W

        • *1: w/ Grille Shutter System

        • *2: w/ Simple Intelligent Parking Assist System

        • *3: w/ Toyota Safety Sense

  2. NO. 1 CAN JUNCTION CONNECTOR (w/ Occupant Classification System)


    1. Check the No. 1 CAN junction connector.


      1. Connection diagram

        B004OWQC01
        *a

        Front view of wire harness connector

        (to No. 1 CAN Junction Connector)

        		 *b to Swing Grille Actuator Assembly
        *c to Central Gateway ECU (Network Gateway ECU) - -

      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
        F69-1 (CANH) B

        Swing grille actuator assembly

        (for Bus 1)
        F69-12 (CANL) W
        F69-2 (CANH) BE

        Central gateway ECU (network gateway ECU)

        (for Bus 1)
        F69-13 (CANL) W
        F69-3 (CANH) SB

        Central gateway ECU (network gateway ECU)

        (for Bus 1)
        F69-14 (CANL) W

  3. NO. 2 CAN JUNCTION CONNECTOR


    1. Check the No. 2 CAN junction connector.


      1. Connection diagram

        B004OWQC24
        *a

        Front view of wire harness connector

        (to No. 2 CAN Junction Connector)

        		 *b to Central Gateway ECU (Network Gateway ECU)
        *c to Hybrid Vehicle Control ECU *d to Inverter with Converter Assembly
        *e to ECM *f to Brake Booster with Master Cylinder Assembly
        *g to No. 5 CAN Junction Connector *h to Airbag ECU Assembly
        *i to Steering Sensor *j to Power Steering ECU Assembly

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

        Terminal No. (Symbol) Wiring Color Connected to
        F70-1 (CANH) LG

        Central gateway ECU (network gateway ECU)

        (for Bus 2)
        F70-12 (CANL) W
        F70-2 (CANH) L

        Hybrid vehicle control ECU

        (for Bus 2)
        F70-13 (CANL) W
        F70-3 (CANH) GR

        Inverter with converter assembly

        (for Bus 2)
        F70-14 (CANL) W
        F70-4 (CANH) B

        ECM

        (for Bus 2)
        F70-15 (CANL) W
        F70-5 (CANH) P

        Brake booster with master cylinder assembly

        (for Bus 2)
        F70-16 (CANL) W
        F70-7 (CANH) G

        No. 5 CAN junction connector

        (for Bus 4)
        F70-18 (CANL) W
        F70-8 (CANH) R

        Airbag ECU assembly

        (for Bus 4)
        F70-19 (CANL) W
        F70-9 (CANH) SB

        Brake booster with master cylinder assembly

        (for Bus 4)
        F70-20 (CANL) W
        F70-10 (CANH) BE

        Steering sensor

        (for Bus 4)
        F70-21 (CANL) W
        F70-11 (CANH) V

        Power steering ECU assembly

        (for Bus 4)
        F70-22 (CANL) W

  4. NO. 3 CAN JUNCTION CONNECTOR


    1. Check the No. 3 CAN junction connector.


      1. Connection diagram

        B004OWQC03
        *a

        Front view of wire harness connector

        (to No. 3 CAN Junction Connector)

        		 *b to Meter Circuit Plate
        *c to Main Body ECU (Multiplex Network Body ECU) *d to No. 1 Headlight ECU Sub-assembly LH
        *e to Air Conditioning Amplifier Assembly *f to Certification ECU (Smart Key ECU Assembly)
        *g to Central Gateway ECU (Network Gateway ECU) *h

        to Combination Meter Mirror ECU

        (w/ Headup Display System)

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

        Terminal No. (Symbol) Wiring Color Connected to
        F71-1 (CANH) V

        Meter circuit plate

        (for Bus 5)
        F71-12 (CANL) W
        F71-2 (CANH) SB

        Main body ECU (multiplex network body ECU)

        (for Bus 5)
        F71-13 (CANL) W
        F71-3 (CANH) L

        No. 1 headlight ECU sub-assembly LH

        (for Bus 5)
        F71-14 (CANL) W
        F71-4 (CANH) BE

        Air conditioning amplifier assembly

        (for Bus 5)
        F71-15 (CANL) W
        F71-5 (CANH) R

        Certification ECU (smart key ECU assembly)

        (for Bus 5)
        F71-16 (CANL) W
        F71-6 (CANH) B

        Central gateway ECU (network gateway ECU)

        (for Bus 5)
        F71-17 (CANL) W
        F71-7 (CANH) P

        Combination meter mirror ECU*

        (for Bus 5)
        F71-18 (CANL) W

        • *: w/ Headup Display System

  5. NO. 4 CAN JUNCTION CONNECTOR


    1. Check the No. 4 CAN junction connector.


      1. Connection diagram

        B004OWQC29
        *a

        Front view of wire harness connector

        (to No. 4 CAN Junction Connector)

        		 *b

        • to Navigation Receiver Assembly

          (for Navigation Receiver Type)

        • to Radio and Display Receiver Assembly

          (for Radio and Display Type)
        *c to Central Gateway ECU (Network Gateway ECU) - -

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

        Terminal No. (Symbol) Wiring Color Connected to
        F72-1 (CANH) L

        • to Navigation Receiver Assembly*1

        • to Radio and Display Receiver Assembly*2

        (for Bus 3)
        F72-12 (CANL) W
        F72-3 (CANH) G

        Central gateway ECU (network gateway ECU)

        (for Bus 3)
        F72-14 (CANL) W
        F72-4 (CANH) V

        Central gateway ECU (network gateway ECU)

        (for Bus 3)
        F72-15 (CANL) W

        • *1: for Navigation Receiver Type

        • *2: for Radio and Display Type

  6. NO. 5 CAN JUNCTION CONNECTOR


    1. Check the No. 5 CAN junction connector.


      1. Connection diagram

        B004OWQC16
        *a

        Front view of wire harness connector

        (to No. 5 CAN Junction Connector)

        		 *b to No. 2 CAN Junction Connector
        *c to Central Gateway ECU (Network Gateway ECU) *d to ECM
        *e to Hybrid Vehicle Control ECU *f

        to Occupant Detection ECU

        (w/ Occupant Classification System)

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

        Terminal No. (Symbol) Wiring Color Connected to
        F73-1 (CANH) G

        No. 2 CAN junction connector

        (for Bus 4)
        F73-12 (CANL) W
        F73-2 (CANH) LG

        Central gateway ECU (network gateway ECU)

        (for Bus 4)
        F73-13 (CANL) W
        F73-3 (CANH) SB

        ECM

        (for Bus 4)
        F73-14 (CANL) W
        F73-4 (CANH) G

        Hybrid vehicle control ECU

        (for Bus 4)
        F73-15 (CANL) W
        F73-5 (CANH) L

        Occupant detection ECU*

        (for Bus 4)
        F73-16 (CANL) W

        • *: w/ Occupant Classification System

  7. NO. 7 CAN JUNCTION CONNECTOR (w/o Occupant Classification System)


    1. Check the No. 7 CAN junction connector.


      1. Connection diagram

        B004QOIC04
        *a

        Front view of wire harness connector

        (to No. 7 CAN Junction Connector)

        		 *b to Central Gateway ECU (Network Gateway ECU)
        *c

        to Blind Spot Monitor Sensor LH

        (w/ Blind Spot Monitor System)

        		 *d

        to Rear Television Camera Assembly

        (w/ Parking Assist Monitor System)
        *e to No. 1 CAN Junction Connector - -

      2. Check the connection diagram of the components which are connected to the No. 7 CAN junction connector.

        Terminal No. (Symbol) Wiring Color Connected to
        M78-4 (CANH) P

        Central gateway ECU (network gateway ECU)

        (for Bus 1)
        M78-14 (CANL) W
        M78-5 (CANH) B

        Blind spot monitor sensor LH*1

        (for Bus 1)
        M78-15 (CANL) W
        M78-6 (CANH) LG

        Rear television camera assembly*2

        (for Bus 1)
        M78-16 (CANL) W
        M78-7 (CANH) BE

        No. 1 CAN junction connector

        (for Bus 1)
        M78-17 (CANL) W

        • *1: w/ Blind Spot Monitor System

        • *2: w/ Parking Assist Monitor System

  8. DLC3


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

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

      B004QHMC01
      *1 DLC3 - -

    3. CENTRAL GATEWAY ECU (NETWORK GATEWAY ECU)

      B004PZAC01
      4. *a

      Component without harness connected

      (Central Gateway ECU (Network Gateway ECU))

      		 - -

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

  2. Disconnect the F59 central gateway ECU (network gateway ECU) connector.

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

    B004PFMC02
    *a

    Front view of wire harness connector

    (to Central Gateway ECU (Network Gateway ECU))

    		 - -

  4. STEERING SENSOR


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

    2. Disconnect the F55 steering sensor connector.

    3. B004QE2C04
    5. *a

    Front view of wire harness connector

    (to Steering Sensor)

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

  • HYBRID VEHICLE CONTROL ECU

    Refer to Terminals of ECU.

    Click here


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

    2. Disconnect the F2 and F3 hybrid vehicle control ECU connectors.

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

      B004OJJC01
    • *a

    Front view of wire harness connector

    (to Hybrid Vehicle Control ECU)

    		 - -

  • INVERTER WITH CONVERTER ASSEMBLY

    Refer to Terminals of ECU.

    Click here


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

    2. Disconnect the C33 inverter with converter assembly connector.

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

      B004OZHC01
    • *1 DLC3 - -
    *a

    Front view of wire harness connector

    (to Inverter with Converter Assembly)

    		 - -

  • ECM

    Refer to Terminals of ECU.



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

    2. Disconnect the A40 and C31 ECM connectors.

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

      B004R0WC02
    • *a

    Front view of wire harness connector

    (to ECM)

    		 - -

  • METER CIRCUIT PLATE

    Refer to Terminals of ECU.

    Click here


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

    2. Disconnect the F6 meter circuit plate connector.

    3. B004OOQC04
    • *a

    Front view of wire harness connector

    (to Meter Circuit Plate)

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


  • COMBINATION METER MIRROR ECU (w/ Headup Display System)

    Refer to Terminals of ECU.

    Click here


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

    2. Disconnect the G7 combination meter mirror ECU connector.

    3. B004P0VC02
    • *a

    Front view of wire harness connector

    (to Combination Meter Mirror ECU)

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

  • BRAKE BOOSTER WITH MASTER CYLINDER ASSEMBLY

    Refer to Terminals of ECU.

    Click here


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

    2. Disconnect the A41 brake booster with master cylinder assembly connector.

    3. B004ORKC03
    • *a

    Front view of wire harness connector

    (to Brake Booster with Master Cylinder Assembly)

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

  • MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)

    Refer to Terminals of ECU.

    Click here


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

    2. Disconnect the F17 main body ECU (multiplex network body ECU) connector.

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

      B004OQSC01
    • *1 DLC3 - -
    *a

    Front view of wire harness connector

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

    		 - -

  • CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)

    Refer to Terminals of ECU.

    Click here


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

    2. Disconnect the F1 certification ECU (smart key ECU assembly) connector.

    3. B004R06C05
    • *a

    Front view of wire harness connector

    (to Certification ECU (Smart Key ECU Assembly))

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

  • POWER STEERING ECU ASSEMBLY

    Refer to Terminals of ECU.

    Click here


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

    2. Disconnect the F20 and F54 power steering ECU assembly connectors.

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

      B004PNQC01
    • *a

    Front view of wire harness connector

    (to Power Steering ECU Assembly)

    		 - -

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

    Refer to Terminals of ECU.

    Click here


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

    2. Disconnect the F26 clearance warning ECU assembly connector.

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

      B004PFCC01
    • *1 DLC3 - -
    *a

    Front view of wire harness connector

    (to Clearance Warning ECU Assembly)

    		 - -

  • AIRBAG ECU ASSEMBLY

    Refer to Terminals of ECU.

    Click here


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

    2. Disconnect the F56 airbag ECU assembly connector.

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

      B004QN5C01
    • *1 DLC3 - -
    *a

    Front view of wire harness connector

    (to Airbag ECU Assembly)

    		 - -

  • AIR CONDITIONING AMPLIFIER ASSEMBLY

    Refer to Terminals of ECU.

    Click here


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

    2. Disconnect the F58 air conditioning amplifier assembly connector.

    3. B004P5RC04
    • *a

    Front view of wire harness connector

    (to Air Conditioning Amplifier Assembly)

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

  • NAVIGATION RECEIVER ASSEMBLY (for Navigation Receiver Type)

    Refer to Terminals of ECU.

    Click here


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

    2. Disconnect the F92 and F93 navigation receiver assembly connectors.

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

      B004PB8C02
    • *a

    Front view of wire harness connector

    (to Navigation Receiver Assembly)

    		 - -

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

    Refer to Terminals of ECU.



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

    2. Disconnect the F31 and F32 radio and display receiver assembly connectors.

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

      B004PB8C01
    • *a

    Front view of wire harness connector

    (to Radio and Display Receiver Assembly)

    		 - -

  • REAR TELEVISION CAMERA ASSEMBLY (w/ Parking Assist Monitor System)

    Refer to Terminals of ECU.

    Click here


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

    2. Disconnect the R5 rear television camera assembly connector.

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

      B004OH3C01
    • *1 DLC3 - -
    *a

    Front view of wire harness connector

    (to Rear Television Camera Assembly)

    		 - -

  • NO. 1 HEADLIGHT ECU SUB-ASSEMBLY LH

    Refer to Terminals of ECU.

    Click here


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

    2. Disconnect the A18 No. 1 headlight ECU sub-assembly LH connector.

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

      B004P6KC01
    • *1 DLC3 - -
    *a

    Front view of wire harness connector

    (to No. 1 Headlight ECU Sub-assembly LH)

    		 - -

  • SWING GRILLE ACTUATOR ASSEMBLY (w/ Occupant Classification System)

    Refer to Terminals of ECU.

    Click here


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

    2. Disconnect the A36 swing grille actuator assembly connector.

    3. B004PW6C01
    • *a

    Front view of wire harness connector

    (to Swing Grille Actuator Assembly)

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

  • SWING GRILLE ACTUATOR ASSEMBLY (w/o Occupant Classification System and with Grille Shutter System)

    Refer to Terminals of ECU.

    Click here


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

    2. Disconnect the A37 swing grille actuator assembly connector.

    3. B004QE0C03
    • *a

    Front view of wire harness connector

    (to Swing Grille Actuator Assembly)

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

  • BLIND SPOT MONITOR SENSOR LH (w/ Blind Spot Monitor System)

    Refer to Terminals of ECU.

    Click here


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

    2. Disconnect the M55 blind spot monitor sensor LH connector.

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

      B004ORDC01
    • *1 DLC3 - -
    *a

    Front view of wire harness connector

    (to Blind Spot Monitor Sensor LH)

    		 - -

  • DRIVING SUPPORT ECU ASSEMBLY (w/ Toyota Safety Sense)

    Refer to Terminals of ECU.

    Click here


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

    2. Disconnect the F40 driving support ECU assembly connector.

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

      B004QNYC01
    • *1 DLC3 - -
    *a

    Front view of wire harness connector

    (to Driving Support ECU Assembly)

    		 - -

  • FORWARD RECOGNITION CAMERA (w/ Toyota Safety Sense)

    Refer to Terminals of ECU.

    Click here


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

    2. Disconnect the O7 forward recognition camera connector.

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

      B004Q45C01
    • *1 DLC3 - -
    *a

    Front view of wire harness connector

    (to Forward Recognition Camera)

    		 - -

  • MILLIMETER WAVE RADAR SENSOR ASSEMBLY (w/ Toyota Safety Sense)

    Refer to Terminals of ECU.

    Click here


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

    2. Disconnect the A2 millimeter wave radar sensor assembly connector.

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

      B004OZYC01
    • *1 DLC3 - -
    *a

    Front view of wire harness connector

    (to Millimeter Wave Radar Sensor Assembly)

    		 - -

  • OCCUPANT DETECTION ECU (w/ Occupant Classification System)

    Refer to Terminals of ECU.

    Click here


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

    2. Disconnect the a11 occupant detection ECU connector.

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

      B004OL2C02
    • *1 DLC3 - -
    *a

    Front view of wire harness connector

    (to Occupant Detection ECU)

    		 - -