CAN COMMUNICATION SYSTEM (for LHD with Entry and Start System), Diagnostic DTC:U1100

DTC Code DTC Name
U1100 Lost Communication with Seat Belt Control ECU

DESCRIPTION

DTC Code DTC Detection Condition Trouble Area
U1100 There is no communication from the seat belt control ECU.

  • Power source or inside seat belt control ECU

  • Seat belt control ECU branch wire or connector

  • Seat belt control ECU

WIRING DIAGRAM

A00JXLWE04

INSPECTION PROCEDURE

Note

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

Tech Tips

Operating the engine 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 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 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 Click here.

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


    NEXT

  2. FOR OPEN IN CAN BUS WIRE (SEAT BELT CONTROL ECU BRANCH WIRE)


    1. A00K0W1E03
      Text in Illustration
      *a

      Rear view of wire harness connector

      (to Seat Belt Control ECU)

      Disconnect the G118 seat belt control ECU connector.

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

      Standard Resistance
      Tester Connection Switch Condition Specified Condition
      G118-1 (CANH) - G118-2 (CANL) Engine switch off 54 to 64 Ω

    NG

    REPAIR OR REPLACE SEAT BELT CONTROL ECU BRANCH WIRE OR CONNECTOR (CANH, CANL)

    OK

  3. CHECK HARNESS AND CONNECTOR (SEAT BELT CONTROL ECU - BATTERY AND BODY GROUND)


    1. A00JVJGE01
      Text in Illustration
      *a

      Rear view of wire harness connector

      (to Seat Belt Control ECU)

      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.

    2. Disconnect the G117 seat belt control ECU connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      G117-8 (PGND) - 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
      G117-7 (+B) - Body ground Always 11 to 14 V
      G118-8 (IG1) - Body ground Engine switch on (IG) 11 to 14 V

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

    REPLACE SEAT BELT CONTROL ECU Click here