CAN COMMUNICATION SYSTEM TERMINALS OF ECU

Tech Tips

Operating the ignition switch, any switches or any doors triggers related ECU and sensor communication with the CAN, which causes resistance variation.


  1. DISCONNECT CABLE FROM NEGATIVE BATTERY TERMINAL


    1. Disconnect the cable from the negative (-) battery terminal before measuring the resistances of the CAN main wire and the CAN branch wire.

      CAUTION:

      Wait at least 90 seconds after disconnecting the cable from the negative (-) battery terminal to disable the SRS system.

      Note


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

      • After turning the ignition switch off, waiting time may be required before disconnecting the cable from the battery terminal. Therefore, make sure to read the disconnecting the cable from the battery terminal notice before proceeding with work Click here.

  2. JUNCTION CONNECTOR


    1. No. 1 Junction Connector

      A01IQEOE63
      Text in Illustration
      *a for Main Body ECU (Instrument Panel Junction Block Assembly) *b for Brake Actuator Assembly (Skid Control ECU)
      *c for No. 2 Junction Connector *d for ECM
      No. 1 Junction Connector Wiring Color Connect to
      A50-7 (CANH) P Main body ECU (instrument panel junction block assembly)
      A50-18 (CANL) W
      A50-8 (CANH) R Brake actuator assembly (skid control ECU)
      A50-19 (CANL) W
      A50-9 (CANH) B No. 2 junction connector
      A50-20 (CANL) W
      A50-10 (CANH) Y ECM
      A50-21 (CANL) W

    2. No. 2 Junction Connector


      1. w/ Entry and Start System:

        A01IQEOE64
        Text in Illustration
        *a for Power Management Control ECU *b for Certification ECU (Smart Key ECU Assembly)
        *c for Power Steering ECU Assembly *d for Radio and Display Receiver Assembly (for Radio and Display Type)
        *e for Spiral with Sensor Cable Sub-assembly (Steering Angle Sensor) *f for Yaw Rate Sensor
        *g for DLC3 *h

        • for Engine Stop and Start ECU (w/ Stop and Start System)

        • for Air Conditioning Amplifier Assembly (for 1ZR-FAE, 2ZR-FAE)
        *i for Combination Meter Assembly *j for No. 1 Junction Connector
        *k for Center Airbag Sensor Assembly - -
        No. 2 Junction Connector Wiring Color Connect to
        H88-1 (CANH) G Power management control ECU
        H88-12 (CANL) W
        H88-2 (CANH) SB Certification ECU (smart key ECU assembly)
        H88-13 (CANL) W
        H88-3 (CANH) SB Power steering ECU assembly
        H88-14 (CANL) W
        H88-4 (CANH) SB Radio and display receiver assembly*1
        H88-15 (CANL) W
        H88-5 (CANH) BR Spiral with sensor cable sub-assembly (steering angle sensor)
        H88-16 (CANL) W
        H88-6 (CANH) L Yaw rate sensor
        H88-17 (CANL) W
        H88-7 (CANH) LG DLC3
        H88-18 (CANL) W
        H88-8 (CANH)

        R*2

        V*3

        • Engine stop and start ECU*2

        • Air conditioning amplifier assembly*3
        H88-19 (CANL) W
        H88-9 (CANH) SB Combination meter assembly
        H88-20 (CANL) W
        H88-10 (CANH) B No. 1 junction connector
        H88-21 (CANL) W
        H88-11 (CANH) Y Center airbag sensor assembly
        H88-22 (CANL) W

        • *1: for Radio and Display Type

        • *2: w/ Stop and Start System

        • *3: for 1ZR-FAE, 2ZR-FAE

      2. w/o Entry and Start System:

        A01IQEOE71
        Text in Illustration
        *a for Air Conditioning Amplifier Assembly *b for Power Steering ECU Assembly
        *c for Radio and Display Receiver Assembly (for Radio and Display Type) *d for Spiral with Sensor Cable Sub-assembly (Steering Angle Sensor)
        *e for Yaw Rate Sensor *f for DLC3
        *g for Engine Stop and Start ECU (w/ Stop and Start System) *h for Combination Meter Assembly
        *i for No. 1 Junction Connector *j for Center Airbag Sensor Assembly
        No. 2 Junction Connector Wiring Color Connect to
        H88-2 (CANH) V Air conditioning amplifier assembly
        H88-13 (CANL) W
        H88-3 (CANH) SB Power steering ECU assembly
        H88-14 (CANL) W
        H88-4 (CANH) SB Radio and display receiver assembly*1
        H88-15 (CANL) W
        H88-5 (CANH) BR Spiral with sensor cable sub-assembly (steering angle sensor)
        H88-16 (CANL) W
        H88-6 (CANH) L Yaw rate sensor
        H88-17 (CANL) W
        H88-7 (CANH) LG DLC3
        H88-18 (CANL) W
        H88-8 (CANH) R Engine stop and start ECU*2
        H88-19 (CANL) W
        H88-9 (CANH) SB Combination meter assembly
        H88-20 (CANL) W
        H88-10 (CANH) B No. 1 junction connector
        H88-21 (CANL) W
        H88-11 (CANH) Y Center airbag sensor assembly
        H88-22 (CANL) W

        • *1: for Radio and Display Type

        • *2: w/ Stop and Start System

    3. No. 3 Junction Connector (for 1WW [w/ Entry and Start System])

      A01IQEOE70
      Text in Illustration
      *a for ECM *b for Power Management Control ECU (Power Management Bus)
      *c for Air Conditioning Amplifier Assembly - -
      No. 3 Junction Connector Wiring Color Connect to
      H126-5 (CANH) R ECM
      H126-16 (CANL) W
      H126-6 (CANH) G Power management control ECU (power management bus)
      H126-17 (CANL) W
      H126-7 (CANH) V Air conditioning amplifier assembly
      H126-18 (CANL) W

  3. CHECK DLC3


    1. Disconnect the cable from the negative (-) battery terminal before measuring the resistances of the CAN main wire and the CAN branch wire.

      CAUTION:

      Wait at least 90 seconds after disconnecting the cable from the negative (-) battery terminal to disable the SRS system.

      Note


      • After turning the ignition switch off, waiting time may be required before disconnecting the cable from the battery terminal. Therefore, make sure to read the disconnecting the cable from the battery terminal notice before proceeding with work Click here.

      • When disconnecting the cable, some systems need to be initialized after the cable is reconnected Click here.

    2. A01ISU0E43

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

      Terminal No. (Symbol) Wiring Color Switch Condition Specified Condition
      H16-6 (CANH) - H16-14 (CANL) LG - W Ignition switch off 54 to 69 Ω
      H16-6 (CANH) - H16-4 (CG) LG - W-B Ignition switch off 200 Ω or higher
      H16-14 (CANL) - H16-4 (CG) W - W-B Ignition switch off 200 Ω or higher
      H16-6 (CANH) - H16-16 (BAT) LG - G Ignition switch off 6 kΩ or higher
      H16-14 (CANL) - H16-16 (BAT) W - G Ignition switch off 6 kΩ or higher

  4. CHECK ECM (for 1ZR-FAE, 2ZR-FAE)

    A01IN05E06
    Text in Illustration
    *A for V1 Bus *B for Powertrain Bus

    1. Disconnect the A76 and C111 ECM connectors.

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

      for V1 Bus
      Terminal No. (Symbol) Wiring Color Switch Condition Specified Condition
      A76-13 (CANH) - A76-26 (CANL) Y - W Ignition switch off 108 to 132 Ω
      A76-13 (CANH) - C111-59 (E1) Y - BR Ignition switch off 200 Ω or higher
      A76-26 (CANL) - C111-59 (E1) W - BR Ignition switch off 200 Ω or higher
      A76-13 (CANH) - A76-1 (BATT) Y - P Ignition switch off 6 kΩ or higher
      A76-26 (CANL) - A76-1 (BATT) W - P Ignition switch off 6 kΩ or higher
      for Powertrain Bus
      Terminal No. (Symbol) Wiring Color Switch Condition Specified Condition
      C111-31 (CAN+) - C111-32 (CAN-) Y - W Ignition switch off 108 to 132 Ω
      C111-31 (CAN+) - C111-59 (E1) Y - BR Ignition switch off 200 Ω or higher
      C111-32 (CAN-) - C111-59 (E1) W - BR Ignition switch off 200 Ω or higher
      C111-31 (CAN+) - A76-1 (BATT) Y - P Ignition switch off 6 kΩ or higher
      C111-32 (CAN-) - A76-1 (BATT) W - P Ignition switch off 6 kΩ or higher

  5. CHECK ECM (for 1WW)

    A01IN05E07
    Text in Illustration
    *A for V1 Bus *B for Power Management Bus

    1. Disconnect the A76 ECM connector.

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

      for V1 Bus
      Terminal No. (Symbol) Wiring Color Switch Condition Specified Condition
      A76-26 (CANH) - A76-25 (CANL) Y - W Ignition switch off 108 to 132 Ω
      A76-26 (CANH) - A76-4 (E1) Y - W-B Ignition switch off 200 Ω or higher
      A76-25 (CANL) - A76-4 (E1) W - W-B Ignition switch off 200 Ω or higher
      A76-26 (CANH) - A76-15 (BATT) Y - B Ignition switch off 6 kΩ or higher
      A76-25 (CANL) - A76-15 (BATT) W - B Ignition switch off 6 kΩ or higher
      for Power Management Bus
      Terminal No. (Symbol) Wiring Color Switch Condition Specified Condition
      A76-13 (CANP) - A76-12 (CANN) R - W Ignition switch off 108 to 132 Ω
      A76-13 (CANP) - A76-4 (E1) R - W-B Ignition switch off 200 Ω or higher
      A76-12 (CANN) - A76-4 (E1) W - W-B Ignition switch off 200 Ω or higher
      A76-13 (CANP) - A76-15 (BATT) R - B Ignition switch off 6 kΩ or higher
      A76-12 (CANN) - A76-15 (BATT) W - B Ignition switch off 6 kΩ or higher

  6. CHECK POWER MANAGEMENT CONTROL ECU (w/ Entry and Start System)

    A01IOLCE35
    Text in Illustration
    *A for V1 Bus *B for Power Management Bus

    1. Disconnect the H71 power management control ECU connector.

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

      for V1 Bus
      Terminal No. (Symbol) Wiring Color Switch Condition Specified Condition
      H71-14 (CA1H) - H71-13 (CA1L) G - W Ignition switch off 54 to 69 Ω
      H71-14 (CA1H) - H71-6 (GND) G - W-B Ignition switch off 200 Ω or higher
      H71-13 (CA1L) - H71-6 (GND) W - W-B Ignition switch off 200 Ω or higher
      H71-14 (CA1H) - H71-1 (AM22) G - L Ignition switch off 6 kΩ or higher
      H71-13 (CA1L) - H71-1 (AM22) W - L Ignition switch off 6 kΩ or higher
      for Power Management Bus
      Terminal No. (Symbol) Wiring Color Switch Condition Specified Condition
      H71-12 (CA3P) - H71-11 (CA3N) G - W Ignition switch off 108 to 132 Ω
      H71-12 (CA3P) - H71-6 (GND) G - W-B Ignition switch off 200 Ω or higher
      H71-11 (CA3N) - H71-6 (GND) W - W-B Ignition switch off 200 Ω or higher
      H71-12 (CA3P) - H71-1 (AM22) G - L Ignition switch off 6 kΩ or higher
      H71-11 (CA3N) - H71-1 (AM22) W - L Ignition switch off 6 kΩ or higher

  7. CHECK POWER MANAGEMENT CONTROL ECU (for 1WW [w/o Entry and Start System])

    A01IQBUE02

    1. Disconnect the H72 power management control ECU connector.

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

      Terminal No. (Symbol) Wiring Color Switch Condition Specified Condition
      H72-4 (CA3P) - H72-3 (CA3N) R - W Ignition switch off 108 to 132 Ω
      H72-4 (CA3P) - H72-12 (GND) R - W-B Ignition switch off 200 Ω or higher
      H72-3 (CA3N) - H72-12 (GND) W - W-B Ignition switch off 200 Ω or higher
      H72-4 (CA3P) - H72-8 (AM21) R - B Ignition switch off 6 kΩ or higher
      H72-3 (CA3N) - H72-8 (AM21) W - B Ignition switch off 6 kΩ or higher

  8. CHECK MAIN BODY ECU (INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY)

    A01IT08E03
    Text in Illustration
    *1 Vehicle Rear Side *2 Vehicle Front Side

    1. Disconnect the H81, DB and DE main body ECU (instrument panel junction block assembly) connectors.

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

      Terminal No. (Symbol) Wiring Color Switch Condition Specified Condition
      H81-15 (CANH) - H81-16 (CANL) P - W Ignition switch off 54 to 69 Ω
      H81-15 (CANH) - DE-28 (GND1) P - W-B Ignition switch off 200 Ω or higher
      H81-16 (CANL) - DE-28 (GND1) W - W-B Ignition switch off 200 Ω or higher
      H81-15 (CANH) - DB-30 (BECU) P - W Ignition switch off 6 kΩ or higher
      H81-16 (CANL) - DB-30 (BECU) W - W Ignition switch off 6 kΩ or higher

  9. CHECK BRAKE ACTUATOR ASSEMBLY (SKID CONTROL ECU)

    A01IO3EE01
    Text in Illustration
    *A for CVT *B for Manual Transaxle

    1. Disconnect the A78*1 or A79*2 brake actuator assembly (skid control ECU) connector.


      • *1: for CVT

      • *2: for Manual Transaxle

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

      for CVT
      Terminal No. (Symbol) Wiring Color Switch Condition Specified Condition
      A78-26 (CANH) - A78-14 (CANL) R - W Ignition switch off 54 to 69 Ω
      A78-26 (CANH) - A78-38 (GND1) R - W-B Ignition switch off 200 Ω or higher
      A78-14 (CANL) - A78-38 (GND1) W - W-B Ignition switch off 200 Ω or higher
      A78-26 (CANH) - A78-1 (+BM) R - L Ignition switch off 6 kΩ or higher
      A78-14 (CANL) - A78-1 (+BM) W - L Ignition switch off 6 kΩ or higher
      for Manual Transaxle
      Terminal No. (Symbol) Wiring Color Switch Condition Specified Condition
      A79-2 (CANH) - A79-16 (CANL) R - W Ignition switch off 54 to 69 Ω
      A79-2 (CANH) - A79-14 (GND1) R - W-B Ignition switch off 200 Ω or higher
      A79-16 (CANL) - A79-14 (GND1) W - W-B Ignition switch off 200 Ω or higher
      A79-2 (CANH) - A79-15 (+BM) R - L Ignition switch off 6 kΩ or higher
      A79-16 (CANL) - A79-15 (+BM) W - L Ignition switch off 6 kΩ or higher

  10. CHECK AIR CONDITIONING AMPLIFIER ASSEMBLY (for Automatic Air Conditioning System)

    A01IQCKE07

    1. Disconnect the H46 air conditioning amplifier assembly connector.

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

      Terminal No. (Symbol) Wiring Color Condition Specified Condition
      H46-11 (CANH) - H46-12 (CANL) V - W Ignition switch off 54 to 69 Ω
      H46-11 (CANH) - H46-14 (GND) V - W-B Ignition switch off 200 Ω or higher
      H46-12 (CANL) - H46-14 (GND) W - W-B Ignition switch off 200 Ω or higher
      H46-11 (CANH) - H46-21 (B) V - W Ignition switch off 6 kΩ or higher
      H46-12 (CANL) - H46-21 (B) W - W Ignition switch off 6 kΩ or higher

  11. CHECK AIR CONDITIONING AMPLIFIER ASSEMBLY (for Manual Air Conditioning System or w/o Air Conditioning System)

    A01IOOLE01

    1. Disconnect the H118 air conditioning amplifier assembly connector.

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

      Terminal No. (Symbol) Wiring Color Condition Specified Condition
      H118-8 (CANH) - H118-9 (CANL) V - W Ignition switch off 54 to 69 Ω
      H118-8 (CANH) - H118-23 (GND) V - W-B Ignition switch off 200 Ω or higher
      H118-9 (CANL) - H118-23 (GND) W - W-B Ignition switch off 200 Ω or higher
      H118-8 (CANH) - H16-16 (BAT) V - G Ignition switch off 6 kΩ or higher
      H118-9 (CANL) - H16-16 (BAT) W - G Ignition switch off 6 kΩ or higher

  12. CHECK COMBINATION METER ASSEMBLY

    A01IOCCE10

    1. Disconnect the H62 combination meter assembly connector.

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

      Terminal No. (Symbol) Wiring Color Switch Condition Specified Condition
      H62-22 (CANH) - H62-23 (CANL) SB - W Ignition switch off 108 to 132 Ω
      H62-22 (CANH) - H62-21 (ET) SB - BR Ignition switch off 200 Ω or higher
      H62-23 (CANL) - H62-21 (ET) W - BR Ignition switch off 200 Ω or higher
      H62-22 (CANH) - H62-40 (B) SB - W Ignition switch off 6 kΩ or higher
      H62-23 (CANL) - H62-40 (B) W - W Ignition switch off 6 kΩ or higher

  13. CHECK CENTER AIRBAG SENSOR ASSEMBLY

    A01IQYFE02

    1. Disconnect the H19 center airbag sensor assembly connector Click here.

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

      Terminal No. (Symbol) Wiring Color Switch Condition Specified Condition
      H19-13 (CANH) - H19-22 (CANL) Y - W Ignition switch off 54 to 69 Ω
      H19-13 (CANH) - H19-25 (E1) Y - W-B Ignition switch off 200 Ω or higher
      H19-22 (CANL) - H19-25 (E1) W - W-B Ignition switch off 200 Ω or higher
      H19-13 (CANH) - H16-16 (BAT) Y - G Ignition switch off 6 kΩ or higher
      H19-22 (CANL) - H16-16 (BAT) W - G Ignition switch off 6 kΩ or higher

  14. CHECK SPIRAL WITH SENSOR CABLE SUB-ASSEMBLY (STEERING ANGLE SENSOR)

    A01IULJE07

    1. Disconnect the H128 spiral with sensor cable sub-assembly (steering angle sensor) connector.

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

      Terminal No. (Symbol) Wiring Color Switch Condition Specified Condition
      H128-4 (CANH) - H128-3 (CANL) BR - W Ignition switch off 54 to 69 Ω
      H128-4 (CANH) - H128-2 (ESS) BR - BR Ignition switch off 200 Ω or higher
      H128-3 (CANL) - H128-2 (ESS) W - BR Ignition switch off 200 Ω or higher
      H128-4 (CANH) - H128-6 (BAT) BR - W Ignition switch off 6 kΩ or higher
      H128-3 (CANL) - H128-6 (BAT) W - W Ignition switch off 6 kΩ or higher

  15. CHECK YAW RATE SENSOR

    A01INNOE03

    1. Disconnect the H68 yaw rate sensor connector.

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

      Terminal No. (Symbol) Wiring Color Switch Condition Specified Condition
      H68-2 (CANH) - H68-3 (CANL) L - W Ignition switch off 54 to 69 Ω
      H68-2 (CANH) - H68-4 (GNDA) L - BR Ignition switch off 200 Ω or higher
      H68-3 (CANL) - H68-4 (GNDA) W - BR Ignition switch off 200 Ω or higher
      H68-2 (CANH) - H16-16 (BAT) L - G Ignition switch off 6 kΩ or higher
      H68-3 (CANL) - H16-16 (BAT) W - G Ignition switch off 6 kΩ or higher

  16. CHECK POWER STEERING ECU ASSEMBLY

    A01ITTDE01

    1. Disconnect the H49 power steering ECU assembly connector.

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

      Terminal No. (Symbol) Wiring Color Switch Condition Specified Condition
      H49-2 (CANH) - H49-8 (CANL) SB - W Ignition switch off 54 to 69 Ω
      H49-2 (CANH) - H16-4 (CG) SB - W-B Ignition switch off 200 Ω or higher
      H49-8 (CANL) - H16-4 (CG) W - W-B Ignition switch off 200 Ω or higher
      H49-2 (CANH) - H16-16 (BAT) SB - G Ignition switch off 6 kΩ or higher
      H49-8 (CANL) - H16-16 (BAT) W - G Ignition switch off 6 kΩ or higher

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

    A01IOA4E55

    1. Disconnect the H51 certification ECU (smart key ECU assembly) connector.

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

      Terminal No. (Symbol) Wiring Color Switch Condition Specified Condition
      H51-9 (CANH) - H51-10 (CANL) SB - W Ignition switch off 54 to 69 Ω
      H51-9 (CANH) - H51-15 (E) SB - W-B Ignition switch off 200 Ω or higher
      H51-10 (CANL) - H51-15 (E) W - W-B Ignition switch off 200 Ω or higher
      H51-9 (CANH) - H51-17 (CUTB) SB - W Ignition switch off 6 kΩ or higher
      H51-10 (CANL) - H51-17 (CUTB) W - W Ignition switch off 6 kΩ or higher

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

    A01IQ5YE01

    1. Disconnect the H105 and H107 radio and display receiver assembly connectors.

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

      Terminal No. (Symbol) Wiring Color Switch Condition Specified Condition
      H105-9 (CANH) - H105-10 (CANL) SB - W Ignition switch off 54 to 69 Ω
      H105-9 (CANH) - H107-7 (GND1) SB - BR Ignition switch off 200 Ω or higher
      H105-10 (CANL) - H107-7 (GND1) W - BR Ignition switch off 200 Ω or higher
      H105-9 (CANH) - H107-4 (+B1) SB - SB Ignition switch off 6 kΩ or higher
      H105-10 (CANL) - H107-4 (+B1) W - SB Ignition switch off 6 kΩ or higher

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

    A01IOBFE14

    1. Disconnect the A73 and H121 engine stop and start ECU connectors.

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

      Terminal No. (Symbol) Wiring Color Switch Condition Specified Condition
      H121-15 (CANH) - H121-16 (CANL) R - W Ignition switch off 54 to 69 Ω
      H121-15 (CANH) - A73-8 (GND) R - W-B Ignition switch off 200 Ω or higher
      H121-16 (CANL) - A73-8 (GND) W - W-B Ignition switch off 200 Ω or higher
      H121-15 (CANH) - A73-7 (BIN) R - L Ignition switch off 6 kΩ or higher
      H121-16 (CANL) - A73-7 (BIN) W - L Ignition switch off 6 kΩ or higher

  20. CHECK CONTINUOUSLY VARIABLE VALVE LIFT CONTROLLER ASSEMBLY (for 2ZR-FAE)

    A01IPRTE01

    1. Disconnect the C49 continuously variable valve lift controller assembly connector.

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

      Terminal No. (Symbol) Wiring Color Switch Condition Specified Condition
      C49-4 (CAN+) - C49-2 (CAN-) Y - W Ignition switch off 54 to 69 Ω
      C49-4 (CAN+) - H16-4 (CG) Y - W-B Ignition switch off 200 Ω or higher
      C49-2 (CAN-) - H16-4 (CG) W - W-B Ignition switch off 200 Ω or higher
      C49-4 (CAN+) - C49-1 (+B) Y - B Ignition switch off 6 kΩ or higher
      C49-2 (CAN-) - C49-1 (+B) W - B Ignition switch off 6 kΩ or higher