PRE-CRASH SAFETY SYSTEM, Diagnostic DTC:U1104

DTC Code DTC Name
U1104 Lost Communication with Driving Support ECU

DESCRIPTION

The driving support ECU assembly is connected to the millimeter wave radar sensor assembly, forward recognition camera and skid control ECU assembly via CAN communication. If communication with the millimeter wave radar sensor assembly, forward recognition camera or skid control ECU assembly stops, the driving support ECU assembly stores DTC U1104.

DTC Code DTC Detection Condition Trouble Area
U1104

  • When the power switch is on (IG), a communication error between the driving support ECU assembly and the millimeter wave radar sensor assembly is detected for approximately 0.2 seconds.

  • When the power switch is on (IG), a communication error between the driving support ECU assembly and the forward recognition camera is detected for approximately 0.3 seconds.

  • When the power switch is on (IG), a communication error between the driving support ECU assembly and the skid control ECU assembly is detected for approximately 1.5 seconds.

  • CAN communication system

  • Millimeter wave radar sensor assembly

  • Forward recognition camera

  • Skid control ECU assembly

  • Driving support ECU assembly

CAUTION / NOTICE / HINT

Note


  • When replacing the driving support ECU assembly, always replace it with a new one. If a driving support ECU assembly which was installed to another vehicle is used, the information stored in the driving support ECU assembly will not match the information from the vehicle. As a result, a DTC may be stored.

  • When replacing the forward recognition camera, always replace it with a new one. If a forward recognition camera which was installed to another vehicle is used, the information stored in the forward recognition camera will not match the information from the vehicle. As a result, a DTC may be stored.

  • If the forward recognition camera has been replaced with a new one, be sure to perform Forward Recognition Camera Learning Click here.

  • When replacing the millimeter wave radar sensor assembly, always replace it with a new one. If a millimeter wave radar sensor assembly which was installed to another vehicle is used, the information stored in the millimeter wave radar sensor assembly will not match the information from the vehicle. As a result, a DTC may be stored.

  • When the millimeter wave radar sensor assembly is replaced with a new one, adjustment of the radar sensor beam axis must be performed Click here.

  • Confirm that the connectors are securely connected, as a partially connected connector can cause this DTC to be stored.

PROCEDURE


  1. CHECK FOR DTCs (PRE-CRASH SAFETY SYSTEM)


    1. Check for DTCs Click here.

      Result
      Result Proceed to
      Only DTC U1104 is output A
      DTC U1104 and other DTCs are output B

    B

    GO TO DIAGNOSTIC TROUBLE CODE CHART Click here

    A

  2. CHECK FOR DTCs (FORWARD RECOGNITION CAMERA SYSTEM)


    1. Check for DTCs Click here.

      Result
      Result Proceed to
      Forward recognition camera system DTCs are not output A
      Forward recognition camera system DTCs are output B

    B

    GO TO FORWARD RECOGNITION CAMERA SYSTEM Click here

    A

  3. CHECK FOR DTCs (ELECTRONICALLY CONTROLLED BRAKE SYSTEM)


    1. Check for DTCs Click here.

      Result
      Result Proceed to
      Electronically controlled brake system DTCs are not output A
      Electronically controlled brake system DTCs are output B

    B

    GO TO ELECTRONICALLY CONTROLLED BRAKE SYSTEM Click here

    A

  4. PERFORM YAW RATE AND ACCELERATION SENSOR ZERO POINT CALIBRATION AND STORE SYSTEM INFORMATION (ELECTRONICALLY CONTROLLED BRAKE SYSTEM)

    Tech Tips

    Enter Test Mode to check if the electronically controlled brake system is operating properly.


    1. Using the GTS, perform "Yaw Rate And Acceleration Sensor Zero Point Calibration And Store System Information" Click here.


    NEXT

  5. CHECK FOR DTCs (PRE-CRASH SAFETY SYSTEM)


    1. Clear the DTCs Click here.

    2. Perform the following procedure.

      Tech Tips

      If the following procedure is not performed, the previously output DTC cannot be detected.


      1. Turn the power switch on (IG) and wait 1.5 seconds or more.

    3. Check for DTCs Click here.

      Result
      Result Proceed to
      DTC U1104 is not output A
      DTC U1104 is output B

    A

    END

    B

  6. REPLACE MILLIMETER WAVE RADAR SENSOR ASSEMBLY


    1. Replace the millimeter wave radar sensor assembly Click here.

    2. Adjust the millimeter wave radar sensor assembly Click here.


    NEXT

  7. CHECK FOR DTCs (PRE-CRASH SAFETY SYSTEM)


    1. Clear the DTCs Click here.

    2. Perform the following procedure.

      Tech Tips

      If the following procedure is not performed, the previously output DTC cannot be detected.


      1. Turn the power switch on (IG) and wait 1.5 seconds or more.

    3. Check for DTCs Click here.

      Result
      Result Proceed to
      DTC U1104 is not output A
      DTC U1104 is output B

    A

    END (MILLIMETER WAVE RADAR SENSOR ASSEMBLY WAS DEFECTIVE)

    B

  8. REPLACE DRIVING SUPPORT ECU ASSEMBLY


    1. Replace the driving support ECU assembly Click here.


    NEXT

  9. CHECK FOR DTCs (PRE-CRASH SAFETY SYSTEM)


    1. Clear the DTCs Click here.

    2. Perform the following procedure.

      Tech Tips

      If the following procedure is not performed, the previously output DTC cannot be detected.


      1. Turn the power switch on (IG) and wait 1.5 seconds or more.

    3. Check for DTCs Click here.

      Result
      Result Proceed to
      DTC U1104 is not output A
      DTC U1104 is output B

    A

    END (DRIVING SUPPORT ECU ASSEMBLY WAS DEFECTIVE)

    B

  10. REPLACE FORWARD RECOGNITION CAMERA


    1. Replace the forward recognition camera Click here.

    2. Adjust the forward recognition camera Click here.


    NEXT

  11. CHECK FOR DTCs (PRE-CRASH SAFETY SYSTEM)


    1. Clear the DTCs Click here.

    2. Perform the following procedure.

      Tech Tips

      If the following procedure is not performed, the previously output DTC cannot be detected.


      1. Turn the power switch on (IG) and wait 1.5 seconds or more.

    3. Check for DTCs Click here.

      Result
      Result Proceed to
      DTC U1104 is not output A
      DTC U1104 is output B

    A

    END (FORWARD RECOGNITION CAMERA WAS DEFECTIVE)

    B

  12. REPLACE SKID CONTROL ECU ASSEMBLY


    1. Replace the skid control ECU assembly Click here.


    NEXT

    END (SKID CONTROL ECU ASSEMBLY WAS DEFECTIVE)