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Home >> Lexus >> 2017 >> ES 350 >> Repair and Diagnosis >> Restraints >> Restraints Control Systems >> Pre-Collision System (Diagnostic Codes & Circuit Tests) >> Pre-Collision System >> DTC U1104: Lost Communication with Driving Support ECU [07/2015 - ] >> Procedure

DTC U1104: Lost Communication with Driving Support ECU [07/2015 - ]: Procedure

  1. CHECK DTC OUTPUT (PRE-COLLISION SYSTEM) 
    1. Connect the Techstream to the DLC3.
    2. Turn the engine switch on (IG).
    3. Turn the Techstream on.
    4. Enter the following menus: Body Electrical / Pre-Collision 2 / Trouble Codes.
    5. Check for DTCs (Refer to DTC CHECK / CLEAR [07/2015 - ] ).

      Result

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

    Result:  B

    B 

    GO TO DIAGNOSTIC TROUBLE CODE CHART 

    (Refer to DIAGNOSTIC TROUBLE CODE CHART [07/2015 - ] )

    Result:  A

    A 

    See step  2

  2. CHECK DTC OUTPUT (FRONT RECOGNITION CAMERA SYSTEM) 
    1. Connect the Techstream to the DLC3.
    2. Turn the engine switch on (IG).
    3. Turn the Techstream on.
    4. Enter the following menus: Body Electrical / Front Recognition Camera / Trouble Codes.
    5. Check for DTCs (Refer to DTC CHECK / CLEAR [07/2015 - ] ).

      Result

      Result Proceed to
      Front recognition camera system DTC are not output A
      Front recognition camera system DTC are output B

    Result:  B

    B 

    GO TO FRONT RECOGNITION CAMERA SYSTEM 

    (Refer to DIAGNOSTIC TROUBLE CODE CHART [07/2015 - ] )

    Result:  A

    A 

    See step  3

  3. CHECK DTC OUTPUT (VSC SYSTEM) 
    1. Connect the Techstream to the DLC3.
    2. Turn the engine switch on (IG).
    3. Turn the Techstream on.
    4. Enter the following menus: Chassis / ABS/VSC/TRAC / Trouble Codes.
    5. Check for DTCs (Refer to DTC CHECK / CLEAR [07/2015 - ] ).

      Result

      Result Proceed to
      Vehicle stability control system DTCs are not output. A
      Vehicle stability control system DTCs are output. B

    Result:  B

    B 

    GO TO VEHICLE STABILITY CONTROL SYSTEM 

    (Refer to DIAGNOSTIC TROUBLE CODE CHART [07/2015 - ] )

    Result:  A

    A 

    See step  4

  4. TEST MODE INSPECTION (VEHICLE STABILITY CONTROL SYSTEM) 

    HINT: 

    Enter Test Mode to check if the VSC system is operating properly.

    1. Connect the Techstream to the DLC3.
    2. Turn the engine switch on (IG).
      NOTE:

      Do not start the engine.

    3. Turn the Techstream on.
    4. Switch the skid control ECU (brake actuator assembly) to Test Mode using the Techstream. Enter the following menus: Chassis / ABS/VSC/TRAC / Utility / Test Mode.
      NOTE:

      Do not enter Test Mode with the engine started.

      HINT: 

      Test mode procedure (Refer to CALIBRATION [07/2015 - ] ).

    5. After Test Mode has been entered, keep the vehicle stationary on a level surface for 5 seconds or more.
    6. Perform the steps displayed on the Techstream to end Test Mode.
    7. Turn the engine switch off.

    Result:  NEXT

    NEXT 

    See step  5

  5. CHECK DTC OUTPUT (PRE-COLLISION SYSTEM) 
    1. Connect the Techstream to the DLC3.
    2. Turn the engine switch on (IG).
    3. Turn the Techstream on.
    4. Enter the following menus: Body Electrical / Pre-Collision 2 / Trouble Codes.
    5. Clear the DTCs (Refer to DTC CHECK / CLEAR [07/2015 - ] ).
    6. Make sure that the DTC detection conditions are met.

      HINT: 

      If the detection conditions are not met, the system cannot detect the malfunction.

    7. Check for DTCs (Refer to DTC CHECK / CLEAR [07/2015 - ] ).

      Result

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

    Result:  B

    B 

    END 

    Result:  A

    A 

    See step  6

  6. REPLACE MILLIMETER WAVE RADAR SENSOR ASSEMBLY 
    1. Replace the millimeter wave radar sensor assembly (Refer to REMOVAL [07/2015 - ] ).
    2. Adjust the millimeter wave radar sensor assembly (Refer to ADJUSTMENT [07/2015 - ] ).

    Result:  NEXT

    NEXT 

    See step  7

  7. CHECK DTC OUTPUT (PRE-COLLISION SYSTEM) 
    1. Connect the Techstream to the DLC3.
    2. Turn the engine switch on (IG).
    3. Turn the Techstream on.
    4. Enter the following menus: Body Electrical / Pre-Collision 2 / Trouble Codes.
    5. Clear the DTCs (Refer to DTC CHECK / CLEAR [07/2015 - ] ).
    6. Make sure that the DTC detection conditions are met.

      HINT: 

      If the detection conditions are not met, the system cannot detect the malfunction.

    7. Check for DTCs (Refer to DTC CHECK / CLEAR [07/2015 - ] ).

      Result

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

    Result:  B

    B 

    END (MILLIMETER WAVE RADAR SENSOR ASSEMBLY WAS DEFECTIVE) 

    Result:  A

    A 

    See step  8

  8. REPLACE DRIVING SUPPORT ECU ASSEMBLY 
    1. Replace the driving support ECU assembly (Refer to REMOVAL [07/2015 - ] ).

    Result:  NEXT

    NEXT 

    See step  9

  9. CHECK DTC OUTPUT (PRE-COLLISION SYSTEM) 
    1. Connect the Techstream to the DLC3.
    2. Turn the engine switch on (IG).
    3. Turn the Techstream on.
    4. Enter the following menus: Body Electrical / Pre-Collision 2 / Trouble Codes.
    5. Clear the DTCs (Refer to DTC CHECK / CLEAR [07/2015 - ] ).
    6. Make sure that the DTC detection conditions are met.

      HINT: 

      If the detection conditions are not met, the system cannot detect the malfunction.

    7. Check for DTCs (Refer to DTC CHECK / CLEAR [07/2015 - ] ).

      Result

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

    Result:  B

    B 

    END (DRIVING SUPPORT ECU ASSEMBLY WAS DEFECTIVE) 

    Result:  A

    A 

    See step  10

  10. REPLACE FORWARD RECOGNITION CAMERA 
    1. Replace the forward recognition camera (Refer to REMOVAL [07/2015 - ] ).
    2. Adjust the forward recognition camera (Refer to ADJUSTMENT [07/2015 - ] ).

    Result:  NEXT

    NEXT 

    See step  11

  11. CHECK DTC OUTPUT (PRE-COLLISION SYSTEM) 
    1. Connect the Techstream to the DLC3.
    2. Turn the engine switch on (IG).
    3. Turn the Techstream on.
    4. Enter the following menus: Body Electrical / Pre-Collision 2 / Trouble Codes.
    5. Clear the DTCs (Refer to DTC CHECK / CLEAR [07/2015 - ] ).
    6. Make sure that the DTC detection conditions are met.

      HINT: 

      If the detection conditions are not met, the system cannot detect the malfunction.

    7. Check for DTCs (Refer to DTC CHECK / CLEAR [07/2015 - ] ).

      Result

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

    Result:  B

    B 

    END (FORWARD RECOGNITION CAMERA WAS DEFECTIVE) 

    Result:  A

    A 

    See step  12

  12. REPLACE BRAKE ACTUATOR ASSEMBLY 
    1. Replace the brake actuator assembly (Refer to REMOVAL [07/2015 - ] ).

    Result:  NEXT

    NEXT 

    END (BRAKE ACTUATOR ASSEMBLY WAS DEFECTIVE) 

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