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, driver monitor camera and object recognition camera sensor 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.

When CAN communication from the object recognition ECU to the driving support ECU stops, DTC U1119 is output.

This DTC is output from the dynamic cruise control system and lane-keeping system.

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

  • Harness and connector

  • Object recognition ECU

  • Object recognition camera sensor

  • Driving support ECU
U1119 While engine switch is on (IG), communication stop between object recognition ECU and driving support ECU continues for 1 sec. or more

  • CAN communication system

  • Object recognition ECU

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

  • Harness and connector

  • Object recognition ECU

  • Object recognition camera sensor

  • Driving support ECU

WIRING DIAGRAM

A01GKXKE12

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.

      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 SENSOR)

    A01GK5VE03

    1. Disconnect the g1 ECU connector.

    2. Disconnect the X22 camera sensor connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      g1-12 (SGND) - X22-12 (SGND) Always Below 1 Ω
      g1-13 (RX) - X22-14 (TX) Always Below 1 Ω
      g1-14 (TX) - X22-13 (RX) Always Below 1 Ω
      g1-13 (RX) - Body ground Always 10 kΩ or higher
      g1-12 (SGND) - Body ground Always 10 kΩ or higher
      g1-14 (TX) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  3. REPLACE OBJECT RECOGNITION CAMERA SENSOR


    1. Replace the object recognition camera sensor Click here.


    NEXT

  4. ADJUST OBJECT RECOGNITION CAMERA SENSOR


    1. Adjust the object recognition camera sensor Click here.


    NEXT

  5. CHECK OBJECT RECOGNITION ECU


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

    2. Select "Clear" and clear the data.

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

    4. Recheck for DTCs.

      OK
      DTC 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 SENSOR


    1. Adjust the object recognition camera sensor Click here.


    NEXT

  8. CHECK DRIVING SUPPORT ECU


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

    2. Select "Clear" and clear the data.

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

    4. Recheck for DTCs.

      OK
      DTC U1119 and U1120 are not output.

    NG

    REPLACE DRIVING SUPPORT ECU Click here

    OK

    END