CAN COMMUNICATION SYSTEM (for LHD) Clearance Warning ECU Communication Stop Mode

DESCRIPTION

Detection Item DTC Detection Condition Trouble Area
Clearance Warning ECU Communication Stop Mode

Either condition is met:


  • "Clearance Warning (Clearance Sonar)" is not displayed on the "Bus Check" screen.

  • "Clearance Warning ECU Communication Stop Mode" in "DTC Communication Table" applies.

  • Power source or inside of clearance warning ECU assembly

  • Clearance warning ECU assembly CAN branch wire or connector

  • Clearance warning ECU assembly

WIRING DIAGRAM

A015BTME03

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 (CLEARANCE WARNING ECU ASSEMBLY CAN BRANCH WIRE)


    1. A01561VE02
      Text in Illustration
      *a

      Front view of wire harness connector

      (to Clearance Warning ECU Assembly)

      Disconnect the F12 clearance warning ECU assembly connector.

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

      Standard Resistance
      Tester Connection Switch Condition Specified Condition
      F12-3 (CANH) - F12-5 (CANL) Ignition switch off 54 to 69 Ω

    NG

    REPAIR OR REPLACE CLEARANCE WARNING ECU BRANCH WIRE OR CONNECTOR (CANH, CANL)

    OK

  4. CHECK HARNESS AND CONNECTOR (CLEARANCE WARNING ECU ASSEMBLY - BATTERY AND BODY GROUND)


    1. A01561VE03
      Text in Illustration
      *a

      Front view of wire harness connector

      (to Clearance Warning 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 resistance according to the value(s) in the table below.

      Standard Resistance
      Tester Connection Condition Specified Condition
      F12-17 (GND1) - Body ground Always Below 1 Ω

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      F12-15 (IG) - Body ground Ignition switch ON 11 to 14 V

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

    REPLACE CLEARANCE WARNING ECU ASSEMBLY Click here