Mike's Workshop Manuals: Service manuals for every vehicle
Home >> Toyota >> 2018 >> Prius Three >> Repair and Diagnosis >> External Pages >> Different car >> Section 21 (Automatic Headlight Beam Level Control System - Diagnostic Codes) >> Automatic Headlight Beam Level Control System >> DTC B2452: Abnormal Height Sensor Data at Initialization [12/2018 - ] >> Procedure

DTC B2452: Abnormal Height Sensor Data at Initialization [12/2018 - ]: Procedure

WARNING: This page is about a different car, the 2022 Toyota Prius, 2021 Toyota Prius, 2020 Toyota Prius, and 2019 Toyota Prius. However, it is still accessible from the selected car via links, so may be relevant.
  1. CLEAR DTC 
    1. Connect the Techstream to the DLC3.
    2. Turn the power switch on (IG).
    3. Turn the Techstream on.
    4. Enter the following menus: Body Electrical / AFS / Trouble Codes.
    5. Clear the DTCs.

      Body Electrical > AFS > Clear DTCs 

      Result

      Proceed to
      NEXT

    Result: 

    NEXT 

    See step  2

  2. CHECK FOR DTC 
    1. Connect the Techstream to the DLC3.
    2. Turn the power switch on (IG).
    3. Turn the Techstream on.
    4. Enter the following menus: Body Electrical / AFS / Trouble Codes.
    5. Check for DTCs.

      Body Electrical > AFS > Trouble Codes 

      OK

      DTC B2452 is not output.

      HINT: 

      If any DTCs other than B2452 are output, troubleshoot those DTCs first.

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    USE SIMULATION METHOD TO CHECK. Refer to  HOW TO PROCEED WITH TROUBLESHOOTING [12/2018 - 07/2020]  , or refer to  HOW TO PROCEED WITH TROUBLESHOOTING [07/2020 - 06/2021]  , or refer to  HOW TO PROCEED WITH TROUBLESHOOTING [06/2021 - ] 

    Result: 

    NG 

    See step  3

  3. CHECK REAR HEIGHT CONTROL SENSOR SUB-ASSEMBLY LH 
    1. Check the installation condition of the rear height control sensor sub-assembly LH.

      OK

      Rear height control sensor sub-assembly LH is installed correctly.

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    INSTALL PARTS CORRECTLY. Refer to  INSTALLATION [12/2018 - ] 

    Result: 

    OK 

    See step  4

  4. REPLACE REAR HEIGHT CONTROL SENSOR SUB-ASSEMBLY LH 
    1. Replace the rear height control sensor sub-assembly LH with a new or known good one.

      Refer to REMOVAL [12/2018 - ]

      Result

      Proceed to
      NEXT

    Result: 

    NEXT 

    See step  5

  5. CLEAR DTC 
    1. Connect the Techstream to the DLC3.
    2. Turn the power switch on (IG).
    3. Turn the Techstream on.
    4. Enter the following menus: Body Electrical / AFS / Trouble Codes.
    5. Clear the DTCs.

      Body Electrical > AFS > Clear DTCs 

      Result

      Proceed to
      NEXT

    Result: 

    NEXT 

    See step  6

  6. CHECK FOR DTC 
    1. Connect the Techstream to the DLC3.
    2. Turn the power switch on (IG).
    3. Turn the Techstream on.
    4. Enter the following menus: Body Electrical / AFS / Trouble Codes.
    5. Check for DTCs.

      Body Electrical > AFS > Trouble Codes 

      OK

      DTC B2452 is not output.

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    END (REAR HEIGHT CONTROL SENSOR SUB-ASSEMBLY LH WAS DEFECTIVE) 

    Result: 

    NG 

    REPLACE NO. 1 HEADLIGHT ECU SUB-ASSEMBLY LH. Refer to  REMOVAL [12/2018 - ] 

scientia non olet · About Mike's Workshop Manuals