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 ground short.

  • After the power switch is turned off, check that the key reminder warning system and light reminder warning system are not operating.

  • Before measuring the resistance, leave the vehicle as is for at least 1 minute and do not operate the power switch, any other switches or the doors. If any doors need to be opened in order to check connectors, open the doors and leave them open.

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


    1. Check the CAN No. 1 junction connector (Engine room main wire side).

      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 terminals are connected to. The bus name will be shown in brackets (example: (for Power management bus)).


      1. Connection diagram

        A003VWPE02
        Text in Illustration
        *a

        Front view of wire harness connector

        (to CAN No. 1 Junction Connector)

        		 *b

        to ECM

        (for V1 bus)
        *c

        to Skid Control ECU

        (Brake Booster with Master Cylinder Assembly)

        (for V1 bus)

        		 *d

        to Skid Control ECU

        (Brake Booster with Master Cylinder Assembly)

        (for Power management bus)
        *e

        to ECM

        (for Power management bus)

        		 - -

      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 (Applicable Bus)
        A57-1 (CANH) P

        ECM

        (for V1 bus)
        A57-7 (CANL) V
        A57-2 (CANH) LG

        Skid control ECU

        (Brake booster with master cylinder assembly)

        (for V1 bus)
        A57-8 (CANL) L
        A57-3 (CANH) P

        Skid control ECU

        (Brake booster with master cylinder assembly)

        (for Power management bus)
        A57-9 (CANL) V
        A57-4 (CANH) B

        ECM

        (for Power management bus)
        A57-10 (CANL) W

    2. Check the CAN No. 1 junction connector (Instrument panel wire side).


      1. Connection diagram

        A003VWPE04
        Text in Illustration
        *a

        Front view of wire harness connector

        (to CAN No. 1 Junction Connector)

        		 *b

        to CAN No. 5 Junction Connector

        (for Power management bus)
        *c

        Main body ECU

        (Multiplex Network Body ECU)

        (for V1 bus)

        		 *d

        to CAN No. 2 Junction Connector

        (for V1 bus)

      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
        H112-3 (CANH) B

        CAN No. 5 junction connector

        (for Power management bus)
        H112-9 (CANL) W
        H112-5 (CANH) BR

        Main body ECU

        (Multiplex network body ECU)

        (for V1 bus)
        H112-11 (CANL) W
        H112-6 (CANH) R

        CAN No. 2 junction connector

        (for V1 bus)
        H112-12 (CANL) W

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


    1. Check the CAN No. 1 junction connector (Engine room main wire side).


      1. Connection diagram

        A003VWPE16
        Text in Illustration
        *a

        Front view of wire harness connector

        (to CAN No. 1 Junction Connector)

        		 *b to ECM
        *c to Transmission Control ECU Assembly - -

      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
        A71-1 (CANH) P ECM
        A71-7 (CANL) V
        A71-2 (CANH) Y Transmission control ECU assembly
        A71-8 (CANL) BR

    2. Check the CAN No. 1 junction connector (Instrument panel wire side).


      1. Connection diagram

        A003VWPE17
        Text in Illustration
        *a

        Front view of wire harness connector

        (to CAN No. 1 Junction Connector)

        		 *b to Power Management Control ECU
        *c

        to Main body ECU

        (Multiplex Network Body ECU)

        		 *d to CAN No. 2 Junction Connector

      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
        H141-4 (CANH) P Power Management Control ECU
        H141-10 (CANL) V
        H141-5 (CANH) BR

        Main body ECU

        (Multiplex network body ECU)
        H141-11 (CANL) W
        H141-6 (CANH) R CAN No. 2 junction connector
        H141-12 (CANL) W

  3. CAN NO. 2 JUNCTION CONNECTOR


    1. Check the CAN No. 2 junction connector (Instrument panel connector holder front side).


      1. Connection diagram

        A003YI4E16
        Text in Illustration
        *a

        Front view of wire harness connector

        (to CAN No. 2 Junction Connector)

        		 *b

        to Steering Angle Sensor

        (Spiral Cable with Sensor Sub-assembly)
        *c

        to Certification ECU

        (Smart Key ECU Assembly)

        		 *d to Airbag Sensor Assembly
        *e to Yaw Rate and Acceleration 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
        H105-3 (CANH) L

        Steering angle sensor

        (Spiral cable with sensor sub-assembly)
        H105-2 (CANL) B
        H105-6 (CANH) L

        Certification ECU

        (Smart key ECU assembly)
        H105-5 (CANL) B
        H105-9 (CANH) L Airbag sensor assembly
        H105-8 (CANL) B
        H105-12 (CANH) L Yaw rate and acceleration sensor
        H105-11 (CANL) B

    2. Check the CAN No. 2 junction connector (Instrument panel connector holder rear side).


      1. Connection diagram

        A003YI4E17
        Text in Illustration
        *a

        Front view of wire harness connector

        (to CAN No. 2 Junction Connector)

        		 *b to CAN No. 1 Junction Connector
        *c to CAN No. 3 Junction Connector *d to DLC3
        *e to Power Steering ECU Assembly *f

        to Navigation ECU (to Display and Navigation Module Display)*1

        to Navigation ECU (to Navigation Computer Sub-assembly)*2

      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
        H104-1 (CANH) R CAN No. 1 junction connector
        H104-2 (CANL) W
        H104-4 (CANH) R CAN No. 3 junction connector
        H104-5 (CANL) W
        H104-7 (CANH) R DLC3
        H104-8 (CANL) W
        H104-10 (CANH) R Power steering ECU assembly
        H104-11 (CANL) W
        H104-13 (CANH) R

        Navigation ECU (to Display and navigation module display)*1

        Navigation ECU (to Navigation computer sub-assembly)*2
        H104-14 (CANL) W

        *1: w/ Navigation system (for DVD)

        *2: w/ Navigation system (for HDD)

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


    1. Check the CAN No. 3 junction connector (Engine room main wire side).


      1. Connection diagram

        A003VWPE07
        Text in Illustration
        *a

        Front view of wire harness connector

        (to CAN No. 3 Junction Connector)

        		 *b to Transmission Control ECU Assembly

      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
        A58-1 (CANH) Y Transmission control ECU assembly
        A58-7 (CANL) BR

    2. Check the CAN No. 3 junction connector (Instrument panel wire side).


      1. Connection diagram

        A003VWPE08
        Text in Illustration
        *a

        Front view of wire harness connector

        (to CAN No. 3 Junction Connector)

        		 *b to Power Management Control ECU
        *c to CAN No. 2 Junction Connector *d to Combination Meter Assembly

      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
        H113-4 (CANH) P Power management control ECU
        H113-10 (CANL) V
        H113-5 (CANH) R CAN No. 2 junction connector
        H113-11 (CANL) W
        H113-6 (CANH) P Combination meter assembly
        H113-12 (CANL) V

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


    1. Check the CAN No. 3 junction connector (Engine room main wire side).

      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 terminals are connected to. The bus name will be shown in brackets (example: (for Power management bus)).


      1. Connection diagram

        A003VWPE18
        Text in Illustration
        *a

        Front view of wire harness connector

        (to CAN No. 3 Junction Connector)

        		 *b

        to Skid Control ECU

        (Brake Booster with Master Cylinder Assembly)

        (for V1 bus)
        *c

        to Skid Control ECU

        (Brake Booster with Master Cylinder Assembly)

        (for Power management bus)

        		 *d

        to ECM

        (for Power management bus)

      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
        A72-1 (CANH) LG

        Skid control ECU

        (Brake booster with master cylinder assembly)

        (for V1 bus)
        A72-7 (CANL) L
        A72-3 (CANH) P

        Skid control ECU

        (Brake booster with master cylinder assembly)

        (for Power management bus)
        A72-9 (CANL) V
        A72-4 (CANH) B

        ECM

        (for Power management bus)
        A72-10 (CANL) W

    2. Check the CAN No. 3 junction connector (Instrument panel wire side).


      1. Connection diagram

        A003VWPE19
        Text in Illustration
        *a

        Front view of wire harness connector

        (to CAN No. 3 Junction Connector)

        		 *b

        to CAN No. 5 Junction Connector

        (for Power management bus)
        *c

        to CAN No. 2 Junction Connector

        (for V1 bus)

        		 *d

        to Combination Meter Assembly

        (for V1 bus)

      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
        H142-3 (CANH) B

        CAN No. 5 junction connector

        (for Power management bus)
        H142-9 (CANL) W
        H142-5 (CANH) R

        CAN No. 2 junction connector

        (for V1 bus)
        H142-11 (CANL) W
        H142-6 (CANH) P

        Combination meter assembly

        (for V1 bus)
        H142-12 (CANL) V

  6. CAN NO. 4 JUNCTION CONNECTOR (for V2 Bus)


    1. Check the CAN No. 4 junction connector.


      1. Connection diagram

        A003VS6E01
        Text in Illustration
        *1 CAN No. 4 Junction Connector - -
        *a Junction Connector B Side *b Junction Connector A Side
        *c Earth Terminal *d

        Front view of wire harness connector

        (to CAN No. 4 Junction Connector)

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

      Junction Connector B Side
      Terminal No. (Symbol) Wiring Color Connected to
      H110-1 (CANH) P Parking assist ECU
      H110-2 (CANL) B
      Junction Connector A Side
      Terminal No. (Symbol) Wiring Color Connected to
      H111-1 (GND) W-B Body ground
      H106-1 (CANH) R Power management control ECU
      H106-2 (CANL) B
      H107-1 (CANH) G Clearance warning ECU assembly
      H107-2 (CANL) B
      H108-1 (CANH) L Driving support ECU assembly
      H108-2 (CANL) B
      H109-1 (CANH) Y Seat belt control ECU
      H109-2 (CANL) B

  7. CAN NO. 5 JUNCTION CONNECTOR (for Power Management Bus)


    1. Check the CAN No. 5 junction connector (Instrument panel connector holder front side).


      1. Connection diagram

        A003VWPE09
        Text in Illustration
        *a

        Front view of wire harness connector

        (to CAN No. 5 Junction Connector)

        		 *b to CAN No. 1 Junction Connector

      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
        H97-2 (CANH) B CAN No. 1 junction connector
        H97-3 (CANL) W

    2. Check the CAN No. 5 junction connector (Instrument panel connector holder rear side).


      1. Connection diagram

        A003VWPE20
        Text in Illustration
        *a

        Front view of wire harness connector

        (to CAN No. 5 Junction Connector)

        		 *b to Air Conditioning Amplifier Assembly
        *c to Power Management Control ECU - -

      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
        H98-5 (CANH) Y Air conditioning amplifier assembly
        H98-3 (CANL) BR
        H98-6 (CANH) LG Power management control ECU
        H98-4 (CANL) L

  8. CAN NO. 6 JUNCTION CONNECTOR (for MS Bus)


    1. Check the CAN No. 6 junction connector.


      1. Connection diagram

        A003W95E01
        Text in Illustration
        *1 CAN No. 6 Junction Connector - -
        *a Junction Connector B Side *b Junction Connector A Side
        *c Earth Terminal *d

        Front view of wire harness connector

        (to CAN No. 6 Junction Connector)

    2. Check the connection diagram of the components which are connected to the CAN No. 6 junction connector.

      Junction Connector A Side
      Terminal No. (Symbol) Wiring Color Connected to
      H103-1 (GND) W-B Body ground
      H99-1 (CANH) R

      • Outer mirror control ECU assembly (Front passenger side)*1

      • Outer mirror control ECU assembly (Drive side)*2
      H99-2 (CANL) W
      H100-1 (CANH) G

      Main body ECU

      (Multiplex network body ECU)
      H100-2 (CANL) W
      H101-1 (CANH) L Position control ECU and switch assembly
      H101-2 (CANL) W
      H102-1 (CANH) Y

      • Outer mirror control ECU assembly (Drive side)*1

      • Outer mirror control ECU assembly (Front passenger side)*2
      H102-2 (CANL) W

      • *1: for LHD

      • *2: for RHD

  9. DLC3


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

      A003YRME13
      Text in Illustration
      *1 DLC3 - -

  10. ECM


    1. Disconnect the ECM connectors.

      A003ZWFE21
      Text in Illustration
      *a

      Front view of wire harness connector

      (to ECM)

      		 - -

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

    3. COMBINATION METER ASSEMBLY


      1. Disconnect the combination meter assembly connector.

        A003Y3ME26
      4. Text in Illustration
      *a

      Front view of wire harness connector

      (to Combination Meter Assembly)

      		 - -

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

  12. POWER MANAGEMENT CONTROL ECU

    A003WHCE36

    1. V1 Bus Branch Lines


      1. A003ZOXE26
    13. Text in Illustration
    *a

    Rear view of wire harness connector

    (to Power Management Control ECU)

Disconnect the power management control ECU connector.

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

  • V2 Bus Main Lines


    1. A003V8WE35
    • Text in Illustration
    *a

    Rear view of wire harness connector

    (to Power Management Control ECU)

    Disconnect the power management control ECU connector.

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

  • Power Management Bus Main Lines


    1. A003ZOXE27
    • Text in Illustration
    *a

    Rear view of wire harness connector

    (to Power Management Control ECU)

    Disconnect the power management control ECU connector.

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

  • MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)

    A003WC3E07

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

      A003ZFLE08
    • Text in Illustration
    *1 DLC3 - -
    *a

    Front view of wire harness connector

    (to Multiplex Network Body ECU)

    		 - -

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

  • SKID CONTROL ECU (BRAKE BOOSTER WITH MASTER CYLINDER ASSEMBLY)


    1. A003VYDE66
    • Text in Illustration
    *a

    Front view of wire harness connector

    (to Skid Control ECU)

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

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

  • STEERING ANGLE SENSOR (SPIRAL CABLE WITH SENSOR SUB-ASSEMBLY)


    1. A003VC8E74
    • Text in Illustration
    *a

    Front view of wire harness connector

    (to Steering Angle Sensor)

    Disconnect the steering angle sensor connector.

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

  • YAW RATE AND ACCELERATION SENSOR


    1. A003ZJ7E37
    • Text in Illustration
    *1 DLC3
    *a

    Front view of wire harness connector

    (to Yaw Rate and Acceleration Sensor)

    Disconnect the yaw rate and acceleration sensor connector.

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

  • POWER STEERING ECU ASSEMBLY


    1. Disconnect the power steering ECU assembly connectors.

      A003XMGE16
    • Text in Illustration
    *a

    Front view of wire harness connector

    (to Power Steering ECU Assembly)

    		 - -

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

  • AIRBAG SENSOR ASSEMBLY


    1. Disconnect the airbag sensor assembly connector.

      A003ZHVE17
    • Text in Illustration
    *1 DLC3 - -
    *a

    Front view of wire harness connector

    (to Airbag Sensor Assembly)

    		 - -

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

  • CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)


    1. Disconnect the smart key ECU assembly connector.

      A003WAGE12
    • Text in Illustration
    *1 w/ Entry Function *2 w/o Entry Function
    *a

    Front view of wire harness connector

    (to Certification ECU)

    		 - -

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

    *1: w/ Entry Function

    *2: w/o Entry Function

  • TRANSMISSION CONTROL ECU ASSEMBLY

    A003Z61E08

    1. A003Z4FE09
    • Text in Illustration
    *a

    Front view of wire harness connector

    (to Transmission Control ECU Assembly)

    Disconnect the transmission control assembly ECU connectors.

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

  • NAVIGATION ECU (DISPLAY AND NAVIGATION MODULE DISPLAY) (w/ Navigation System for DVD)

    A003YYUE06

    1. A003X0JE62
    • Text in Illustration
    *a

    Front view of wire harness connector

    (to Display and Navigation Module Display)

    Disconnect the navigation ECU (display and navigation module display) connector.

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

  • NAVIGATION ECU (NAVIGATION COMPUTER SUB-ASSEMBLY) (w/ Navigation System for HDD)

    A003YS4E09

    1. A003X0JE62
    • Text in Illustration
    *a

    Front view of wire harness connector

    (to Navigation Computer Sub-Assembly)

    Disconnect the navigation ECU (navigation computer sub-assembly) connector.

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

  • AIR CONDITIONING AMPLIFIER ASSEMBLY


    1. Disconnect the air conditioning amplifier assembly connector.

      A003Y3ME25
    • Text in Illustration
    *a

    Front view of wire harness connector

    (to Air Conditioning Amplifier Assembly)

    		 - -

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

  • SEAT BELT CONTROL ECU (w/ Pre-crash Safety System)

    A003ZLZE37

    1. A003XETE06
    • Text in Illustration
    *a

    Front view of wire harness connector

    (to Seat Belt Control ECU)

    Disconnect the seat belt control ECU connectors.

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

  • DRIVING SUPPORT ECU ASSEMBLY (w/ Dynamic Radar Cruise Control System)


    1. A003VNUE59
    • Text in Illustration
    *a

    Front view of wire harness connector

    (to Driving Support ECU Assembly)

    Disconnect the driving support ECU assembly connector.

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

  • OUTER MIRROR CONTROL ECU ASSEMBLY (for Driver side)

    A003WTNE34

    1. A003WAZE38
    • Text in Illustration
    *a

    Front view of wire harness

    (to Outer Mirror Control ECU Assembly)
    *b for LHD
    *c for RHD

    Disconnect the outer mirror control ECU assembly connector.

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

  • OUTER MIRROR CONTROL ECU ASSEMBLY (for Front passenger side)

    A003WTNE35

    1. A003WAZE39
    • Text in Illustration
    *a

    Front view of wire harness

    (to Outer Mirror Control ECU Assembly)
    *b for LHD
    *c for RHD

    Disconnect the outer mirror control ECU assembly connector.

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

  • POSITION CONTROL ECU AND SWITCH ASSEMBLY (w/ Seat Position Memory for LHD)

    A003WUVE17

    1. Disconnect the connectors of the position control ECU and switch assembly.

      A003V1IE05
    • Text in Illustration
    *a

    Front view of wire harness connector

    (to Position Control ECU and Switch Assembly)

    		 - -

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

  • POSITION CONTROL ECU AND SWITCH ASSEMBLY (w/ Seat Position Memory for RHD)

    A003WUVE18

    1. Disconnect the connectors of the position control ECU and switch assembly.

      A003V1IE06
    • Text in Illustration
    *a

    Front view of wire harness connector

    (to Position Control ECU and Switch Assembly)

    		 - -

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

  • PARKING ASSIST ECU (w/ Navigation System)

    A003YD8E24

    1. A003W4CE36
    • Text in Illustration
    *a

    Front view of wire harness connector

    (to Parking Assist ECU)

    Disconnect the parking assist ECU connector.

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

  • CLEARANCE WARNING ECU ASSEMBLY (w/ LEXUS Parking Assist Sensor System)


    1. Disconnect the clearance warning ECU assembly connector.

      A003XB5E07
    • Text in Illustration
    *1 DLC3 - -
    *a

    Front view of wire harness connector

    (to Clearance Warning ECU Assembly)

    		 - -

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