CAN COMMUNICATION SYSTEM TERMINALS OF ECU

Note:

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

    Click here

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

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

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

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

Tip:

  • 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. NO. 1 CAN JUNCTION CONNECTOR (ENGINE ROOM MAIN WIRE)

    1. Check the A59 No. 1 CAN junction connector.

      1. Connection diagram

        C289290C08

        *a

        Front view of wire harness connector

        (to No. 1 CAN Junction Connector)

        *b

        to ECM

        *c

        to Skid Control ECU (Brake Actuator Assembly)

        *d

        to Engine Stop and Start ECU

        (w/ Stop and Start System)

      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

        A59-1 (CANH)

        B

        ECM

        A59-12 (CANL)

        W

        A59-2 (CANH)

        V

        Skid control ECU (brake actuator assembly)

        A59-13 (CANL)

        W

        A59-3 (CANH)

        P

        Engine stop and start ECU*

        A59-14 (CANL)

        W

        *: w/ Stop and Start System

  2. NO. 1 CAN JUNCTION CONNECTOR (INSTRUMENT PANEL WIRE)

    1. Check the E2 No. 1 CAN junction connector.

      1. Connection diagram

        C281852C84

        *a

        Front view of wire harness connector

        (to No. 1 CAN Junction Connector)

        *b

        to Airbag Sensor Assembly

        *c

        to Radio and Display Receiver Assembly

        (for Radio and Display Type)

        *d

        to Combination Meter Assembly

        *e

        to Air Conditioning Control Assembly

        (for Automatic Air Conditioning System)

        *f

        to Power Steering ECU Assembly

        *g

        to Steering Sensor (Spiral Cable Sub-assembly)

        *h

        to DLC3

        *i

        to Certification ECU (Smart Key ECU Assembly)

        (w/ Entry and Start System)

        *j

        to Pre-collision City Sensor

        (w/ Toyota Safety Sense)

      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

        E2-1 (CANH)

        V

        Airbag sensor assembly

        E2-12 (CANL)

        W

        E2-2 (CANH)

        G

        Radio and display receiver assembly*1

        E2-13 (CANL)

        W

        E2-4 (CANH)

        LG

        Combination meter assembly

        E2-15 (CANL)

        W

        E2-5 (CANH)

        Y

        Air conditioning control assembly*2

        E2-16 (CANL)

        W

        E2-6 (CANH)

        GR

        Power steering ECU assembly

        E2-17 (CANL)

        W

        E2-7 (CANH)

        SB

        Steering sensor (spiral cable sub-assembly)

        E2-18 (CANL)

        W

        E2-8 (CANH)

        BE

        DLC3

        E2-19 (CANL)

        W

        E2-9 (CANH)

        R

        Certification ECU (smart key ECU assembly)*3

        E2-20 (CANL)

        W

        E2-10 (CANH)

        B

        Pre-collision city sensor*4

        E2-21 (CANL)

        W

        • *1: for Radio and Display Type

        • *2: for Automatic Air Conditioning System

        • *3: w/ Entry and Start System

        • *4: w/ Toyota Safety Sense

  3. DLC3

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

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

      C188081C16

      *1

      DLC3

      -

      -

      Standard Resistance

      Terminal No. (Symbol)

      Wiring Color

      Terminal Description

      Condition

      Specified Condition

      E8-6 (CANH) - E8-14 (CANL)

      BE - W

      HIGH-level CAN bus line - LOW-level CAN bus line

      Cable disconnected from negative (-) battery terminal

      54 to 69 Ω

      E8-6 (CANH) - E8-4 (CG)

      BE - W-B

      HIGH-level CAN bus line - Ground

      Cable disconnected from negative (-) battery terminal

      200 Ω or higher

      E8-14 (CANL) - E8-4 (CG)

      W - W-B

      LOW-level CAN bus line - Ground

      Cable disconnected from negative (-) battery terminal

      200 Ω or higher

      E8-6 (CANH) - E8-16 (BAT)

      BE - GR

      HIGH-level CAN bus line - Battery positive (+)

      Cable disconnected from negative (-) battery terminal

      6 kΩ or higher

      E8-14 (CANL) - E8-16 (BAT)

      W - GR

      LOW-level CAN bus line - Battery positive (+)

      Cable disconnected from negative (-) battery terminal

      6 kΩ or higher

  4. ECM

    A325174C01

    *a

    Component without harness connected

    (ECM)

    -

    -

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

    2. Disconnect the A34 ECM connector.

      C300715C02

      *a

      Front view of wire harness connector

      (to ECM)

      -

      -

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

      Standard Resistance

      Terminal No. (Symbol)

      Wiring Color

      Terminal Description

      Condition

      Specified Condition

      A34-26 (CANH) - A34-25 (CANL)

      B - W

      HIGH-level CAN bus line - LOW-level CAN bus line

      Cable disconnected from negative (-) battery terminal

      108 to 132 Ω

      A34-26 (CANH) - A34-4 (E1)

      B - W-B

      HIGH-level CAN bus line - Ground

      Cable disconnected from negative (-) battery terminal

      200 Ω or higher

      A34-25 (CANL) - A34-4 (E1)

      W - W-B

      LOW-level CAN bus line - Ground

      Cable disconnected from negative (-) battery terminal

      200 Ω or higher

      A34-26 (CANH) - A34-15 (BATT)

      B - SB

      HIGH-level CAN bus line - Battery positive (+)

      Cable disconnected from negative (-) battery terminal

      6 kΩ or higher

      A34-25 (CANL) - A34-15 (BATT)

      W - SB

      LOW-level CAN bus line - Battery positive (+)

      Cable disconnected from negative (-) battery terminal

      6 kΩ or higher

  5. COMBINATION METER ASSEMBLY

    C300720C01

    *a

    Component without harness connected

    (Combination Meter Assembly)

    -

    -

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

    2. Disconnect the E12 combination meter assembly connector.

      C304311C01

      *a

      Front view of wire harness connector

      (to Combination Meter Assembly)

      -

      -

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

      Standard Resistance

      Terminal No. (Symbol)

      Wiring Color

      Terminal Description

      Condition

      Specified Condition

      E12-37 (CANH) - E12-36 (CANL)

      LG - W

      HIGH-level CAN bus line - LOW-level CAN bus line

      Cable disconnected from negative (-) battery terminal

      108 to 132 Ω

      E12-37 (CANH) - E12-38 (ET)

      LG - W-B

      HIGH-level CAN bus line - Ground

      Cable disconnected from negative (-) battery terminal

      200 Ω or higher

      E12-36 (CANL) - E12-38 (ET)

      W - W-B

      LOW-level CAN bus line - Ground

      Cable disconnected from negative (-) battery terminal

      200 Ω or higher

      E12-37 (CANH) - E12-40 (B)

      LG - L

      HIGH-level CAN bus line - Battery positive (+)

      Cable disconnected from negative (-) battery terminal

      6 kΩ or higher

      E12-36 (CANL) - E12-40 (B)

      W - L

      LOW-level CAN bus line - Battery positive (+)

      Cable disconnected from negative (-) battery terminal

      6 kΩ or higher

  6. SKID CONTROL ECU (BRAKE ACTUATOR ASSEMBLY)

    C278418C05

    *a

    Component without harness connected

    (Skid Control ECU (Brake Actuator Assembly))

    -

    -

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

    2. Disconnect the A39 skid control ECU (brake actuator assembly) connector.

      C305134C03

      *a

      Front view of wire harness connector

      (to Skid Control ECU (Brake Actuator Assembly))

      -

      -

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

      Standard Resistance

      Terminal No. (Symbol)

      Wiring Color

      Terminal Description

      Condition

      Specified Condition

      A39-26 (CANH) - A39-14 (CANL)

      V - W

      HIGH-level CAN bus line - LOW-level CAN bus line

      Cable disconnected from negative (-) battery terminal

      54 to 69 Ω

      A39-26 (CANH) - A39-38 (GND1)

      V - W-B

      HIGH-level CAN bus line - Ground

      Cable disconnected from negative (-) battery terminal

      200 Ω or higher

      A39-14 (CANL) - A39-38 (GND1)

      W - W-B

      LOW-level CAN bus line - Ground

      Cable disconnected from negative (-) battery terminal

      200 Ω or higher

      A39-26 (CANH) - A39-25 (+BS)

      V - R

      HIGH-level CAN bus line - Battery positive (+)

      Cable disconnected from negative (-) battery terminal

      6 kΩ or higher

      A39-14 (CANL) - A39-25 (+BS)

      W - R

      LOW-level CAN bus line - Battery positive (+)

      Cable disconnected from negative (-) battery terminal

      6 kΩ or higher

  7. STEERING SENSOR (SPIRAL CABLE SUB-ASSEMBLY)

    C300721C01

    *a

    Component without harness connected

    (Steering Sensor (Spiral Cable Sub-assembly))

    -

    -

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

    2. Disconnect the E15 steering sensor (spiral cable sub-assembly) connector.

      C301160C01

      *a

      Front view of wire harness connector

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

      -

      -

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

      Standard Resistance

      Terminal No. (Symbol)

      Wiring Color

      Terminal Description

      Condition

      Specified Condition

      E15-4 (CANH) - E15-3 (CANL)

      SB - W

      HIGH-level CAN bus line - LOW-level CAN bus line

      Cable disconnected from negative (-) battery terminal

      54 to 69 Ω

      E15-4 (CANH) - E15-2 (ESS)

      SB - W-B

      HIGH-level CAN bus line - Ground

      Cable disconnected from negative (-) battery terminal

      200 Ω or higher

      E15-3 (CANL) - E15-2 (ESS)

      W - W-B

      LOW-level CAN bus line - Ground

      Cable disconnected from negative (-) battery terminal

      200 Ω or higher

      E15-4 (CANH) - E15-6 (BAT)

      SB - GR

      HIGH-level CAN bus line - Battery positive (+)

      Cable disconnected from negative (-) battery terminal

      6 kΩ or higher

      E15-3 (CANL) - E15-6 (BAT)

      W - GR

      LOW-level CAN bus line - Battery positive (+)

      Cable disconnected from negative (-) battery terminal

      6 kΩ or higher
  8. C289293C05

    *a

    Component without harness connected

    (Power Steering ECU Assembly)

    -

    -

    POWER STEERING ECU ASSEMBLY

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

    2. Disconnect the E5 and E6 power steering ECU assembly connectors.

      C289258C04

      *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.

      Standard Resistance

      Terminal No. (Symbol)

      Wiring Color

      Terminal Description

      Condition

      Specified Condition

      E5-7 (CANH) - E5-8 (CANL)

      GR - W

      HIGH-level CAN bus line - LOW-level CAN bus line

      Cable disconnected from negative (-) battery terminal

      54 to 69 Ω

      E5-7 (CANH) - E6-2 (PGND)

      GR - W-B

      HIGH-level CAN bus line - Ground

      Cable disconnected from negative (-) battery terminal

      200 Ω or higher

      E5-8 (CANL) - E6-2 (PGND)

      W - W-B

      LOW-level CAN bus line - Ground

      Cable disconnected from negative (-) battery terminal

      200 Ω or higher

      E5-7 (CANH) - E6-1 (PIG)

      GR - B

      HIGH-level CAN bus line - Battery positive (+)

      Cable disconnected from negative (-) battery terminal

      6 kΩ or higher

      E5-8 (CANL) - E6-1 (PIG)

      W - B

      LOW-level CAN bus line - Battery positive (+)

      Cable disconnected from negative (-) battery terminal

      6 kΩ or higher

  9. AIRBAG SENSOR ASSEMBLY

    H100070C01

    *a

    Component without harness connected

    (Airbag Sensor Assembly)

    -

    -

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

    2. Disconnect the E36 airbag sensor assembly connector.

      C300719C01

      *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.

      Standard Resistance

      Terminal No. (Symbol)

      Wiring Color

      Terminal Description

      Condition

      Specified Condition

      E36-10 (CANH) - E36-11 (CANL)

      V - W

      HIGH-level CAN bus line - LOW-level CAN bus line

      Cable disconnected from negative (-) battery terminal

      54 to 69 Ω

      E36-10 (CANH) - E36-6 (E1)

      V - W-B

      HIGH-level CAN bus line - Ground

      Cable disconnected from negative (-) battery terminal

      200 Ω or higher

      E36-11 (CANL) - E36-6 (E1)

      W - W-B

      LOW-level CAN bus line - Ground

      Cable disconnected from negative (-) battery terminal

      200 Ω or higher

      E36-10 (CANH) - E8-16 (BAT)

      V - GR

      HIGH-level CAN bus line - Battery positive (+)

      Cable disconnected from negative (-) battery terminal

      6 kΩ or higher

      E36-11 (CANL) - E8-16 (BAT)

      W - GR

      LOW-level CAN bus line - Battery positive (+)

      Cable disconnected from negative (-) battery terminal

      6 kΩ or higher

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

    C300724C01

    *a

    Component without harness connected

    (Certification ECU (Smart Key ECU Assembly))

    -

    -

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

    2. Disconnect the E49 and E50 certification ECU (smart key ECU assembly) connectors.

      C300725C01

      *a

      Front 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.

      Standard Resistance

      Terminal No. (Symbol)

      Wiring Color

      Terminal Description

      Condition

      Specified Condition

      E50-40 (CANH) - E50-18 (CANL)

      R - W

      HIGH-level CAN bus line - LOW-level CAN bus line

      Cable disconnected from negative (-) battery terminal

      54 to 69 Ω

      E50-40 (CANH) - E49-10 (E)

      R- BR

      HIGH-level CAN bus line - Ground

      Cable disconnected from negative (-) battery terminal

      200 Ω or higher

      E50-18 (CANL) - E49-10 (E)

      W - BR

      LOW-level CAN bus line - Ground

      Cable disconnected from negative (-) battery terminal

      200 Ω or higher

      E50-40 (CANH) - E49-1 (+B)

      R - B

      HIGH-level CAN bus line - Battery positive (+)

      Cable disconnected from negative (-) battery terminal

      6 kΩ or higher

      E50-18 (CANL) - E49-1 (+B)

      W - B

      LOW-level CAN bus line - Battery positive (+)

      Cable disconnected from negative (-) battery terminal

      6 kΩ or higher

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

    E287048C02

    *a

    Component without harness connected

    (Radio and Display Receiver Assembly)

    -

    -

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

    2. Disconnect the E31 and E32 radio and display receiver assembly connectors.

      C240506C32

      *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.

      Standard Resistance

      Terminal No. (Symbol)

      Wiring Color

      Terminal Description

      Condition

      Specified Condition

      E32-6 (CANH) - E32-7 (CANL)

      G - W

      HIGH-level CAN bus line - LOW-level CAN bus line

      Cable disconnected from negative (-) battery terminal

      54 to 69 Ω

      E32-6 (CANH) - E31-7 (GND1)

      G - BR

      HIGH-level CAN bus line - Ground

      Cable disconnected from negative (-) battery terminal

      200 Ω or higher

      E32-7 (CANL) - E31-7 (GND1)

      W - BR

      LOW-level CAN bus line - Ground

      Cable disconnected from negative (-) battery terminal

      200 Ω or higher

      E32-6 (CANH) - E31-4 (+B1)

      G - SB

      HIGH-level CAN bus line - Battery positive (+)

      Cable disconnected from negative (-) battery terminal

      6 kΩ or higher

      E32-7 (CANL) - E31-4 (+B1)

      W - SB

      LOW-level CAN bus line - Battery positive (+)

      Cable disconnected from negative (-) battery terminal

      6 kΩ or higher
  12. C300722C01

    *a

    Component without harness connected

    (Air Conditioning Control Assembly)

    -

    -

    AIR CONDITIONING CONTROL ASSEMBLY (for Automatic Air Conditioning System)

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

    2. Disconnect the E54 air conditioning control assembly connector.

      C301169C01

      *a

      Front view of wire harness connector

      (to Air Conditioning Control Assembly)

      -

      -

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

      Standard Resistance

      Terminal No. (Symbol)

      Wiring Color

      Terminal Description

      Condition

      Specified Condition

      E54-1 (CANH) - E54-7 (CANL)

      Y - W

      HIGH-level CAN bus line - LOW-level CAN bus line

      Cable disconnected from negative (-) battery terminal

      54 to 69 Ω

      E54-1 (CANH) - E54-12 (GND)

      Y - W-B

      HIGH-level CAN bus line - Ground

      Cable disconnected from negative (-) battery terminal

      200 Ω or higher

      E54-7 (CANL) - E54-12 (GND)

      W - W-B

      LOW-level CAN bus line - Ground

      Cable disconnected from negative (-) battery terminal

      200 Ω or higher

      E54-1 (CANH) - E54-6 (B)

      Y - P*1

      Y - SB*2

      HIGH-level CAN bus line - Battery positive (+)

      Cable disconnected from negative (-) battery terminal

      6 kΩ or higher

      E54-7 (CANL) - E54-6 (B)

      W - P*1

      W - SB*2

      LOW-level CAN bus line - Battery positive (+)

      Cable disconnected from negative (-) battery terminal

      6 kΩ or higher

      • *1: w/o Stop and Start System

      • *2: w/ Stop and Start System

  13. ENGINE STOP AND START ECU (w/ Stop and Start System)

    C301167C02

    *a

    Component without harness connected

    (Engine Stop and Start ECU)

    -

    -

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

    2. Disconnect the A23 and A25 engine stop and start ECU connectors.

      C301168C04

      *a

      Front view of wire harness connector

      (to Engine Stop and Start ECU)

      -

      -

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

      Standard Resistance

      Terminal No. (Symbol)

      Wiring Color

      Terminal Description

      Condition

      Specified Condition

      A25-15 (CANH) - A25-16 (CANL)

      P - W

      HIGH-level CAN bus line - LOW-level CAN bus line

      Cable disconnected from negative (-) battery terminal

      54 to 69 Ω

      A25-15 (CANH) - A23-8 (GND)

      P - W-B

      HIGH-level CAN bus line - Ground

      Cable disconnected from negative (-) battery terminal

      200 Ω or higher

      A25-16 (CANL) - A23-8 (GND)

      W - W-B

      LOW-level CAN bus line - Ground

      Cable disconnected from negative (-) battery terminal

      200 Ω or higher

      A25-15 (CANH) - A23-7 (BIN)

      P - L

      HIGH-level CAN bus line - Battery positive (+)

      Cable disconnected from negative (-) battery terminal

      6 kΩ or higher

      A25-16 (CANL) - A23-7 (BIN)

      W - L

      LOW-level CAN bus line - Battery positive (+)

      Cable disconnected from negative (-) battery terminal

      6 kΩ or higher

  14. PRE-COLLISION CITY SENSOR (w/ Toyota Safety Sense)

    E256359C06

    *a

    Component without harness connected

    (Pre-collision City Sensor)

    -

    -

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

    2. Disconnect the M4 pre-collision city sensor connector.

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

      C313107C03

      *1

      DLC3

      -

      -

      *a

      Front view of wire harness connector

      (to Pre-collision City Sensor)

      -

      -

      Standard Resistance

      Terminal No. (Symbol)

      Wiring Color

      Terminal Description

      Condition

      Specified Condition

      M4-5 (CA1P) - M4-11 (CA1N)

      B - W

      HIGH-level CAN bus line - LOW-level CAN bus line

      Cable disconnected from negative (-) battery terminal

      54 to 69 Ω

      M4-5 (CA1P) - M4-10 (GND)

      B - W-B

      HIGH-level CAN bus line - Ground

      Cable disconnected from negative (-) battery terminal

      200 Ω or higher

      M4-11 (CA1N) - M4-10 (GND)

      W - W-B

      LOW-level CAN bus line - Ground

      Cable disconnected from negative (-) battery terminal

      200 Ω or higher

      M4-5 (CA1P) - E8-16 (BAT)

      B - GR

      HIGH-level CAN bus line - Battery positive (+)

      Cable disconnected from negative (-) battery terminal

      6 kΩ or higher

      M4-11 (CA1N) - E8-16 (BAT)

      W - GR

      LOW-level CAN bus line - Battery positive (+)

      Cable disconnected from negative (-) battery terminal

      6 kΩ or higher