CAN COMMUNICATION SYSTEM (for LHD without Entry and Start System) Main Body ECU Communication Stop Mode

DESCRIPTION

Detection Item Symptom Trouble Area
Main Body ECU Communication Stop Mode

Either condition is met:


  • "Main Body" is not displayed on "Bus Check".

  • "Main Body ECU Communication Stop Mode" in "DTC Combination Table" applies.


  • Power source or inside main body ECU (multiplex network body ECU)

  • Main body ECU (multiplex network body ECU) branch wire or connector

  • Main body ECU (multiplex network body ECU)

WIRING DIAGRAM

A00K02JE05

INSPECTION PROCEDURE

Note

Inspect the fuses for circuits related to this system before performing the following inspection procedure.

Tech Tips

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

PROCEDURE


  1. DISCONNECT CABLE FROM NEGATIVE BATTERY TERMINAL


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


    NEXT
  2. CHECK FOR OPEN IN CAN BUS WIRE (MAIN BODY ECU BRANCH WIRE)


    1. A00JYSVE08
      Text in Illustration
      *a

      Rear view of wire harness connector

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

      Disconnect the G64 main body ECU (multiplex network body ECU) connector.

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

      Standard Resistance
      Tester Connection Switch Condition Specified Condition
      G64-14 (CANH) - G64-13 (CANL) Ignition switch off 54 to 69 Ω

    NG
    OK
  3. CHECK HARNESS AND CONNECTOR (MAIN BODY ECU - BATTERY AND BODY GROUND)


    1. Connect the cable to the negative (-) battery terminal.

      Note

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

      A00K1M5E04
      Text in Illustration
      *a

      Rear view of wire harness connector

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

      *b

      Front view of wire harness connector

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

    2. Remove the main body ECU (multiplex network body ECU) Click here.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      G63-3 (GND2) - Body ground Always Below 1 Ω
      A-11 (GND1) - Body ground Always Below 1 Ω
    4. Measure the voltage according to the value(s) in the table below.

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      A-31 (ALTB) - Body ground Always 11 to 14 V
      A-30 (BECU) - Body ground Always 11 to 14 V
      A-29 (ACC) - Body ground Ignition switch ACC 11 to 14 V
      A-32 (IG) - Body ground Ignition switch ON 11 to 14 V

    NG
    OK