CAN COMMUNICATION SYSTEM (for LHD), Diagnostic DTC:U0104

DTC Code DTC Name
U0104 Lost Communication with Driving Support ECU

DESCRIPTION

DTC Code DTC Detection Condition Trouble Area
U0104 There is no communication from the distance control ECU assembly.
  • Power source circuit of distance control ECU assembly

  • Distance control ECU assembly CAN branch wire or connector

  • Distance control ECU assembly


WIRING DIAGRAM

A01599SE02

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. PRECAUTION

    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.


    NEXT
  2. 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:

      For vehicles with an SRS system:

      Wait at least 90 seconds after disconnecting the cable from the negative (-) 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 (DISTANCE CONTROL ECU ASSEMBLY CAN BRANCH WIRE)


    1. A0156AUE04
      Text in Illustration
      *a

      Rear view of wire harness connector

      (to Distance Control ECU assembly)

      Disconnect the E108 distance control ECU assembly connector.

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

      Standard Resistance
      Tester Connection Switch Condition Specified Condition
      E108-8 (CANH) - E108-9 (CANL) Ignition switch off 54 to 69 Ω

    NG
    OK
  4. CHECK HARNESS AND CONNECTOR (DISTANCE CONTROL ECU ASSEMBLY - BATTERY AND BODY GROUND)


    1. A0156AUE05
      Text in Illustration
      *a

      Rear view of wire harness connector

      (to Distance Control ECU assembly)

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      E108-1 (B) - Body ground Ignition switch ON 11 to 14 V
    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance
      Tester Connection Condition Specified Condition
      E108-12 (GND) - Body ground Always Below 1 Ω

    NG
    OK