LEMON Manuals: Even more car manuals for everyone: 1960-2025
Home >> Lexus >> 2019 >> UX 250h Base >> Repair and Diagnosis (Single Page) >> Accessories & Equipment >> Collision/Avoidance >> Front Camera System (Diagnostic Codes) >> Front Camera System >> DTC U0300-51: Internal Control Module Software Incompatibility Not Programmed [10/2018 - 07/2022] >> Procedure
April 5, 2026: LEMON Manuals is launched! Read the announcement.

DTC U0300-51: Internal Control Module Software Incompatibility Not Programmed [10/2018 - 07/2022]: Procedure

  1. CONFIRM MODEL 
    1. Choose the model to be inspected.

      Result

      Result Proceed to
      for HV Model A
      for Gasoline Model B

    Result: 

    B 

    See step  5

    Result: 

    A 

    See step  2

  2. CHECK FOR DTCs 
    1. Check for DTCs of hybrid control system.

      Powertrain > Hybrid Control > Trouble Codes 

      Result

      Result Proceed to
      DTCs are not output A
      DTCs are output B

    Result: 

    B 

    GO TO HYBRID CONTROL SYSTEM. Refer to  HOW TO PROCEED WITH TROUBLESHOOTING [10/2018 - ] 

    Result: 

    A 

    See step  3

  3. CHECK FOR DTCs (HEALTH CHECK) 
    1. Connect the Techstream to the DLC3.
    2. Turn the ignition switch to ON.
    3. Turn the Techstream on.
    4. Enter the following menus: System Select / Health Check.
    5. Check for DTCs.
    6. Turn the ignition switch off.

      OK

      DTCs indicating a vehicle information mismatch with that of the hybrid vehicle control ECU are not output by any ECU other than the forward recognition camera.

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPLACE HYBRID VEHICLE CONTROL ECU. Refer to  COMPONENTS [10/2018 - ] 

    Result: 

    OK 

    See step  4

  4. READ VALUE USING TECHSTREAM (HV EQUIPPED INFORMATION) 
    1. Connect the Techstream to the DLC3.
    2. Turn the ignition switch to ON.
    3. Turn the Techstream on.
    4. Enter the following menus: Chassis / Front Recognition Camera / Data List.
    5. Read the Data List according to the display on the Techstream.

      Chassis > Front Recognition Camera > Data List 

      Tester Display Measurement Item Range Normal Condition Diagnostic Note
      HV Equipped Information Vehicle information (conventional/hybrid) stored in forward recognition camera Non-HV / HV Non-HV: Conventional vehicle
      HV: Hybrid vehicle      		 -

      Chassis > Front Recognition Camera > Data List 

      Tester Display
      HV Equipped Information

      HINT: 

      • If the vehicle information stored in the forward recognition camera is different from the actual vehicle specifications, the vehicle information stored in the forward recognition camera may be incorrect. Replace the forward recognition camera.
      • If the vehicle information stored in the forward recognition camera matches the actual vehicle specifications, the installed hybrid vehicle control ECU is incompatible. Replace the hybrid vehicle control ECU.

      Result

      Result Proceed to
      Vehicle information stored in forward recognition camera and actual vehicle specifications do not match A
      Vehicle information stored in forward recognition camera and actual vehicle specifications match B

    Result: 

    A 

    REPLACE FORWARD RECOGNITION CAMERA. Refer to  COMPONENTS [10/2018 - ] 

    Result: 

    B 

    REPLACE HYBRID VEHICLE CONTROL ECU. Refer to  COMPONENTS [10/2018 - ] 

  5. CHECK FOR DTCs 
    1. Check for DTCs of SFI system.

      Powertrain > Engine > Trouble Codes 

      Result

      Result Proceed to
      DTCs are not output A
      DTCs are output B

    Result: 

    B 

    GO TO SFI SYSTEM. Refer to  HOW TO PROCEED WITH TROUBLESHOOTING [10/2018 - 07/2022] 

    Result: 

    A 

    See step  6

  6. CHECK FOR DTCs (HEALTH CHECK) 
    1. Connect the Techstream to the DLC3.
    2. Turn the ignition switch to ON.
    3. Turn the Techstream on.
    4. Enter the following menus: System Select / Health Check.
    5. Check for DTCs.
    6. Turn the ignition switch off.

      OK

      DTCs indicating a vehicle information mismatch with that of the ECM are not output by any ECU other than the forward recognition camera.

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPLACE ECM. Refer to  COMPONENTS [10/2018 - 07/2022] 

    Result: 

    OK 

    See step  7

  7. READ VALUE USING TECHSTREAM (HV EQUIPPED INFORMATION) 
    1. Connect the Techstream to the DLC3.
    2. Turn the ignition switch to ON.
    3. Turn the Techstream on.
    4. Enter the following menus: Chassis / Front Recognition Camera / Data List.
    5. Read the Data List according to the display on the Techstream.

      Chassis > Front Recognition Camera > Data List 

      Tester Display Measurement Item Range Normal Condition Diagnostic Note
      HV Equipped Information Vehicle information (conventional/hybrid) stored in forward recognition camera Non-HV / HV Non-HV: Conventional vehicle
      HV: Hybrid vehicle      		 -

      Chassis > Front Recognition Camera > Data List 

      Tester Display
      HV Equipped Information

      HINT: 

      • If the vehicle information stored in the forward recognition camera is different from the actual vehicle specifications, the vehicle information stored in the forward recognition camera may be incorrect. Replace the forward recognition camera.
      • If the vehicle information stored in the forward recognition camera matches the actual vehicle specifications, the installed ECM is incompatible. Replace the ECM.

      Result

      Result Proceed to
      Vehicle information stored in forward recognition camera and actual vehicle specifications do not match A
      Vehicle information stored in forward recognition camera and actual vehicle specifications match B

    Result: 

    A 

    REPLACE FORWARD RECOGNITION CAMERA. Refer to  COMPONENTS [10/2018 - ] 

    Result: 

    B 

    REPLACE ECM. Refer to  COMPONENTS [10/2018 - 07/2022] 

scientia non olet · About LEMON Manuals