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

      A01IQLSE01
      No. 1 Junction Connector Wiring Color Connect to
      A50-8 (CANH) R Brake actuator assembly (VSC ECU)
      A50-19 (CANL) W
      A50-9 (CANH) B No. 2 junction connector
      A50-20 (CANL) W
      A50-10 (CANH) Y ECM (V1 bus)
      A50-21 (CANL) W

    2. NO. 2 JUNCTION CONNECTOR

      A01IOLJE01
      No. 2 Junction Connector Wiring Color Connect to
      H88-1 (CANH) G Power management control ECU (V1 bus)*1
      H88-12 (CANL) W
      H88-2 (CANH) SB*1, V*2

      • Certification ECU*1

      • Air conditioning amplifier assembly*2
      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*3
      H88-15 (CANL) W
      H88-5 (CANH) BR Spiral 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 Main body ECU (instrument panel junction block assembly)
      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: w/ Entry and Start System

      • *2: w/o Entry and Start System

      • *3: for Radio and Display Type

    3. NO. 3 JUNCTION CONNECTOR (w/ Entry and Start System)

      A01INDGE67
      No. 3 Junction Connector Wiring Color Connect to
      H89-7 (CANH) R ECM (power management bus)
      H89-18 (CANL) W
      H89-8 (CANH) G Power management control ECU (power management bus)
      H89-19 (CANL) W
      H89-9 (CANH) V Air conditioning amplifier assembly
      H89-20 (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 ZR Series Engine)

    A01IOGNE15
    Text in Illustration
    *1 for V1 Bus *2 for Power Management Bus

    1. Disconnect the A51 and C68 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
      A51-8 (CANH) - A51-9 (CANL) Y - W Ignition switch off 108 to 132 Ω
      A51-8 (CANH) - C68-105 (E1) Y - BR Ignition switch off 200 Ω or higher
      A51-9 (CANL) - C68-105 (E1) W - BR Ignition switch off 200 Ω or higher
      A51-8 (CANH) - A51-2 (+B) Y - B Ignition switch off 6 kΩ or higher
      A51-9 (CANL) - A51-2 (+B) W - B Ignition switch off 6 kΩ or higher
      for Power Management Bus
      Terminal No. (Symbol) Wiring Color Switch Condition Specified Condition
      A51-6 (CANP) - A51-7 (CANN) R - W Ignition switch off 108 to 132 Ω
      A51-6 (CANP) - C68-105 (E1) R - BR Ignition switch off 200 Ω or higher
      A51-7 (CANN) - C68-105 (E1) W - BR Ignition switch off 200 Ω or higher
      A51-6 (CANP) - A51-2 (+B) R - B Ignition switch off 6 kΩ or higher
      A51-7 (CANN) - A51-2 (+B) W - B Ignition switch off 6 kΩ or higher

  5. CHECK ECM (for AD Series Engine)

    A01IOGNE16
    Text in Illustration
    *1 for V1 Bus *2 for Power Management Bus

    1. Disconnect the A51 and C69 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
      A51-7 (CANH) - A51-6 (CANL) Y - W Ignition switch off 108 to 132 Ω
      A51-7 (CANH) - C69-109 (E1) Y - BR Ignition switch off 200 Ω or higher
      A51-6 (CANL) - C69-109 (E1) W - BR Ignition switch off 200 Ω or higher
      A51-7 (CANH) - A51-1 (+B) Y - B Ignition switch off 6 kΩ or higher
      A51-6 (CANL) - A51-1 (+B) W - B Ignition switch off 6 kΩ or higher
      for Power Management Bus
      Terminal No. (Symbol) Wiring Color Switch Condition Specified Condition
      A51-5 (CANP) - A51-4 (CANN) R - W Ignition switch off 108 to 132 Ω
      A51-5 (CANP) - C69-109 (E1) R - BR Ignition switch off 200 Ω or higher
      A51-4 (CANN) - C69-109 (E1) W - BR Ignition switch off 200 Ω or higher
      A51-5 (CANP) - A51-1 (+B) R - B Ignition switch off 6 kΩ or higher
      A51-4 (CANN) - A51-1 (+B) W - B Ignition switch off 6 kΩ or higher

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

    A01IOLCE03
    Text in Illustration
    *1 for V1 Bus *2 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 (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 ECU 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) R - W Ignition switch off 54 to 69 Ω
      H81-15 (CANH) - DE-28 (GND1) R - 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) R - 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 (VSC ECU)

    A01IOGZE04
    Text in Illustration
    *1 for AD Series Engine *2 for ZR Series Engine

    1. Disconnect the A52*1 or A54*2 brake actuator assembly (VSC ECU) connector.


      • *1: for AD Series Engine

      • *2: for ZR Series Engine

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

      for AD Series Engine
      Terminal No. (Symbol) Wiring Color Switch Condition Specified Condition
      A52-35 (CANH) - A52-14 (CANL) R - W Ignition switch off 54 to 69 Ω
      A52-35 (CANH) - A52-4 (GND1) R - W-B Ignition switch off 200 Ω or higher
      A52-14 (CANL) - A52-4 (GND1) W - W-B Ignition switch off 200 Ω or higher
      A52-35 (CANH) - A52-2 (+BM) R - L Ignition switch off 6 kΩ or higher
      A52-14 (CANL) - A52-2 (+BM) W - L Ignition switch off 6 kΩ or higher
      for ZR Series Engine
      Terminal No. (Symbol) Wiring Color Switch Condition Specified Condition
      A54-35 (CANH) - A54-14 (CANL) R - W Ignition switch off 54 to 69 Ω
      A54-35 (CANH) - A54-4 (GND1) R - W-B Ignition switch off 200 Ω or higher
      A54-14 (CANL) - A54-4 (GND1) W - W-B Ignition switch off 200 Ω or higher
      A54-35 (CANH) - A54-2 (+BM) R - L Ignition switch off 6 kΩ or higher
      A54-14 (CANL) - A54-2 (+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)

    A01ISAPE01

    1. Disconnect the H9 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
      H9-2 (CANH) - H9-3 (CANL) V - W Ignition switch off 54 to 69 Ω
      H9-2 (CANH) - H9-12 (GND) V - W-B Ignition switch off 200 Ω or higher
      H9-3 (CANL) - H9-12 (GND) W - W-B Ignition switch off 200 Ω or higher
      H9-2 (CANH) - H16-16 (BAT) V - G Ignition switch off 6 kΩ or higher
      H9-3 (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 CABLE SUB-ASSEMBLY (STEERING ANGLE SENSOR)

    A01IULJE02

    1. Disconnect the H69 spiral 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
      H69-4 (CANH) - H69-3 (CANL) BR - W Ignition switch off 54 to 69 Ω
      H69-4 (CANH) - H69-2 (ESS) BR - BR Ignition switch off 200 Ω or higher
      H69-3 (CANL) - H69-2 (ESS) W - BR Ignition switch off 200 Ω or higher
      H69-4 (CANH) - H69-6 (BAT) BR - W Ignition switch off 6 kΩ or higher
      H69-3 (CANL) - H69-6 (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 (w/ Entry and Start System)

    A01IOA4E08

    1. Disconnect the H51 certification ECU 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)

    A01INYAE10

    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