PRE-CRASH SAFETY SYSTEM, Diagnostic DTC:U1119, U1119, U1120

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

DESCRIPTION

The driving support ECU uses the front millimeter wave radar sensor, rear millimeter wave radar sensor, driver monitor camera and object recognition camera to detect obstacles in front of and behind the vehicle, and detect the direction that the driver's head is facing. Based on this information, the driving support ECU sends pre-crash control operation signals.

When a serial communication stop between the object recognition ECU and object recognition camera is detected, DTCs U1119 and U1120 are output.

When a CAN communication stop between the object recognition ECU and driving support ECU is detected, DTC U1119 is output.

DTC Code DTC Detection Condition Trouble Area
U1119 While power switch is ON (IG), serial communication stop between object recognition ECU and object recognition camera continues for 1 second or more

  • Harness or connector

  • Object recognition ECU

  • Object recognition camera

  • Driving support ECU
U1119 While power switch is ON (IG), communication stop between object recognition ECU and driving support ECU continues for 1 second or more

  • CAN communication system

  • Object recognition ECU

  • Driving support ECU
U1120 While power switch is ON (IG), serial communication stop between object recognition camera and object recognition ECU continues for 1 second or more

  • Harness or connector

  • Object recognition ECU

  • Object recognition camera

  • Driving support ECU

WIRING DIAGRAM

A01H23QE17

INSPECTION PROCEDURE

PROCEDURE


  1. READ VALUE USING INTELLIGENT TESTER (OBJECT RECOGNITION ECU)


    1. Using the intelligent tester, enter the following menus: Powertrain / Radar Cruise. Then select "DATA LIST".

    2. Check the condition of the "Communication with Object Recognition ECU" Data List item.

      Radar Cruise
      Tester Display Measurement Item/Range Normal Condition Diagnostic Note
      Communication with Object Recognition ECU Communication with object recognition ECU signal/AVAIL or FAIL

      AVAIL: Communication is normal

      FAIL: Communication is malfunctioning

      		 -

      Tech Tips

      As the "Communication with object recognition ECU" item monitors the CAN communication condition, distinguishing between a CAN communication malfunction and serial communication malfunction is possible. If a CAN communication malfunction may be present, proceed to the DIAGNOSTIC TROUBLE CODE CHART.

      Result
      Result Proceed to
      "Communication with Object Recognition ECU" is "AVAIL" A
      "Communication with Object Recognition ECU" is "FAIL" (for LHD) B
      "Communication with Object Recognition ECU" is "FAIL" (for RHD) C

    B

    GO TO CAN COMMUNICATION SYSTEM Click here

    C

    GO TO CAN COMMUNICATION SYSTEM Click here

    A

  2. CHECK HARNESS AND CONNECTOR (OBJECT RECOGNITION ECU - OBJECT RECOGNITION CAMERA)

    A01GX1CE07

    1. Disconnect the p1 ECU connector.

    2. Disconnect the X3 camera connector.

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

      Standard resistance
      Tester Connection Condition Specified Condition
      p1-12 (SGND) - X3-12 (SGND) Always Below 1 Ω
      p1-13 (RX) - X3-14 (TX) Always Below 1 Ω
      p1-14 (TX) - X3-13 (RX) Always Below 1 Ω
      p1-13 (RX) - Body ground Always 10 kΩ or higher
      p1-12 (SGND) - Body ground Always 10 kΩ or higher
      p1-14 (TX) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  3. REPLACE OBJECT RECOGNITION CAMERA


    1. Replace the object recognition camera Click here.


    NEXT

  4. ADJUST OBJECT RECOGNITION CAMERA


    1. Adjust the object recognition camera Click here.


    NEXT

  5. CHECK FOR DTC


    1. Using the intelligent tester, enter the following menus: Body / Pre-Crash2. Then select "DTC".

    2. Select "Clear" and clear the data.

    3. Based on the DTC detection conditions, try to simulate the malfunction.

    4. Recheck for DTCs.

      OK
      DTCs U1119 and U1120 are not output.

    NG

    REPLACE OBJECT RECOGNITION ECU Click here

    OK

    END

  6. REPLACE OBJECT RECOGNITION ECU


    1. Replace the object recognition ECU Click here.


    NEXT

  7. ADJUST OBJECT RECOGNITION CAMERA


    1. Adjust the object recognition camera sensor Click here.


    NEXT

  8. CHECK FOR DTC


    1. Using the intelligent tester, enter the following menus: Body / Pre-Crash2. Then select "DTC".

    2. Select "Clear" and clear the data.

    3. Based on the DTC detection conditions, try to simulate the malfunction.

    4. Recheck for DTCs.

      OK
      DTCs U1119 and U1120 are not output.

    NG

    REPLACE DRIVING SUPPORT ECU Click here

    OK

    END