Can Communication System (For Lhd With Entry And Start System) Main Body Ecu Communication Stop Mode


DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

DISCONNECT CABLE FROM NEGATIVE BATTERY TERMINAL

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

CHECK HARNESS AND CONNECTOR (MAIN BODY ECU - BATTERY AND BODY GROUND)

CAN COMMUNICATION SYSTEM (for LHD with 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:
  1. "Main Body" is not displayed on "Bus Check".
  2. "Main Body ECU Communication Stop Mode" in "DTC Combination Table" applies.
  1. Power source or inside main body ECU (multiplex network body ECU)
  2. Main body ECU (multiplex network body ECU) CAN branch wire or connector
  3. Main body ECU (multiplex network body ECU)

WIRING DIAGRAM


Land Cruiser, Land Cruiser Prado. Grj150 Trj150,155 Kdj150,155 Lj150, Gdj150,155.Networking.Lin Communication System.Can Communication System (For Lhd With Entry And Start System) Main Body Ecu Communication Stop Mode


INSPECTION PROCEDURE

NOTICE:
Inspect the fuses for circuits related to this system before performing the following inspection procedure.
HINT:
Operating the engine 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 airbag system.
    NOTICE:
    1. After turning the engine 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 (LandCruiser RM000003YMD00TX.html).
    2. When disconnecting the cable, some systems need to be initialized after the cable is reconnected (LandCruiser RM000003YMF011X.html).

NEXT


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


    Land Cruiser, Land Cruiser Prado. Grj150 Trj150,155 Kdj150,155 Lj150, Gdj150,155.Networking.Lin Communication System.Can Communication System (For Lhd With Entry And Start System) Main Body Ecu Communication Stop Mode

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

  1. 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)
    		Engine switch off
    		54 to 69 Ω
    Text in Illustration
    *a
    		Rear view of wire harness connector
    (to Main Body ECU [Multiplex Network Body ECU])


NG
REPAIR OR REPLACE MAIN BODY ECU CAN BRANCH WIRE OR CONNECTOR (CANH, CANL)
OK


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


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

    NOTICE:
    When disconnecting the cable, some systems need to be initialized after the cable is reconnected (LandCruiser RM000003YMF011X.html).

    Land Cruiser, Land Cruiser Prado. Grj150 Trj150,155 Kdj150,155 Lj150, Gdj150,155.Networking.Lin Communication System.Can Communication System (For Lhd With Entry And Start System) Main Body Ecu Communication Stop Mode


    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])

  1. Remove the main body ECU (multiplex network body ECU) (LandCruiser RM000003WBO05FX.html).

  1. 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

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

    Standard Voltage:
    Tester Connection
    		Switch Condition
    		Specified Condition
    A-32 (IG) - Body ground
    		Engine switch on (IG)
    		11 to 14 V
    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
    		Engine switch on (ACC)
    		11 to 14 V


NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) (LandCruiser RM000003WBO05FX.html)