CAN COMMUNICATION SYSTEM (for RHD), Diagnostic DTC:U1119, U1120

DTC Code DTC Name
U1119 Lost Communication with Object Recognition ECU (CAN)
U1120 Lost Communication with Object Recognition Camera

DESCRIPTION

DTC Code DTC Detection Condition Trouble Area
U1119 There is no communication from the object recognition ECU.

  • Power source or inside of object recognition ECU

  • Object recognition ECU CAN branch wire or connector

  • Object recognition ECU
U1120 There is no communication from the object recognition camera.

  • Power source or inside of object recognition ECU

  • Object recognition ECU CAN branch wire or connector

  • Object recognition ECU

WIRING DIAGRAM

A01GXN3E15

INSPECTION PROCEDURE

Note

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

Tech Tips

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

PROCEDURE


  1. PRECAUTION

    Note

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


    NEXT

  2. DISCONNECT CABLE FROM NEGATIVE AUXILIARY BATTERY TERMINAL


    1. Disconnect the cable from the negative (-) auxiliary 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 (-) auxiliary battery terminal to disable the SRS system.

      Note

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


    NEXT

  3. CHECK FOR OPEN IN CAN BUS WIRE (OBJECT RECOGNITION ECU CAN BRANCH WIRE)


    1. A01H0BQE03
      Text in Illustration
      *a

      Rear view of wire harness connector

      (to Object Recognition ECU)

      Disconnect the object recognition ECU connector.

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

      Standard Resistance
      Tester Connection Switch Condition Specified Condition
      p1-16 (CANH) - p1-5 (CANL) Power switch off 54 to 69 Ω

    NG

    REPAIR OR REPLACE OBJECT RECOGNITION ECU CAN BRANCH WIRE OR CONNECTOR (CANH, CANL)

    OK

  4. CHECK HARNESS AND CONNECTOR (OBJECT RECOGNITION ECU - BATTERY AND BODY GROUND)


    1. A01H0BQE04
      Text in Illustration
      *a

      Rear view of wire harness connector

      (to Object Recognition ECU)

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

      Note

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

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      p1-6 (IG) - Body ground Power switch on (IG) 11 to 14 V

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      p1-10 (GND) - Body ground Always Below 1 Ω

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

    REPLACE OBJECT RECOGNITION ECU Click here