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Home >> Lexus >> 2023 >> NX 250 AWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 52 (Electric Parking Brake System - Diagnostics - Introduction) >> ELECTRIC PARKING BRAKE SYSTEM (for HEV Model) >> How To Proceed With Troubleshooting [11/2021 - ] >> Procedure

How To Proceed With Troubleshooting [11/2021 - ]: Procedure

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  1. VEHICLE BROUGHT TO WORKSHOP 

    Result

    Proceed to
    NEXT

    Result: 

    NEXT 

    See step  2

  2. CUSTOMER PROBLEM ANALYSIS 
    1. Interview the customer and confirm the problem.

      Refer to HOW TO PROCEED WITH TROUBLESHOOTING [11/2021 - ]

      Result

      Proceed to
      NEXT

    Result: 

    NEXT 

    See step  3

  3. INSPECT AUXILIARY BATTERY VOLTAGE 
    1. Measure the auxiliary battery voltage with the ignition switch off.

      Standard Voltage

      11 to 14 V (Ignition switch off)

      1. If the voltage is below 11 V, replace or recharge the auxiliary battery before proceeding to the next step.

      Result

      Proceed to
      NEXT

    Result: 

    NEXT 

    See step  4

  4. CHECK DTC AND FREEZE FRAME DATA* 
    1. Check and record DTCs and freeze frame data.

      Chassis > Brake/EPB > Trouble Codes 

    2. Clear the DTCs and freeze frame data.

      Chassis > Brake/EPB > Clear DTCs 

    3. Recheck for DTCs.
      1. Reconfirm the DTCs based on the recorded DTCs and freeze frame data.

        Chassis > Brake/EPB > Trouble Codes 

      2. Try to reproduce the problem symptoms based on the recorded DTCs and freeze frame data, and then check if the DTCs are output again.

      Result

      Result Proceed to
      DTCs are not output (Problem symptom occurs.) A
      DTCs are output B
      DTCs are not output (Problem symptom does not occur.) C

      HINT: 

      • Refer to Diagnostic Trouble Code Chart if any DTCs are output.
      • When DTCs indicating a CAN communication system malfunction are output, first troubleshoot and repair the CAN communication system.

    Result: 

    B 

    GO TO DIAGNOSTIC TROUBLE CODE CHART. Refer to  DIAGNOSTIC TROUBLE CODE CHART [11/2021 - 03/2024]  , or refer to  DIAGNOSTIC TROUBLE CODE CHART [03/2024 - ]  

    Result: 

    C 

    USE SIMULATION METHOD TO CHECK. Refer to  HOW TO PROCEED WITH TROUBLESHOOTING [11/2021 - ] 

    Result: 

    A 

    See step  5

  5. PROBLEM SYMPTOMS TABLE 
    1. Proceed to Problem Symptoms Table.

      Refer to PROBLEM SYMPTOMS TABLE [11/2021 - ] 

      Result

      Result Proceed to
      Fault is not listed in Problem Symptoms Table A
      Fault is listed in Problem Symptoms Table B

    Result: 

    B 

    See step  7

    Result: 

    A 

    See step  6

  6. OVERALL ANALYSIS AND TROUBLESHOOTING* 
    1. Refer to Terminals of ECU.

      Refer to TERMINALS OF ECU [11/2021 - ] 

    2. Refer to Data List / Active Test.

      Refer to DATA LIST / ACTIVE TEST [11/2021 - ] 

      Result

      Proceed to
      NEXT

    Result: 

    NEXT 

    See step  7

  7. REPAIR OR REPLACE 

    Result

    Proceed to
    NEXT

    Result: 

    NEXT 

    See step  8

  8. CONFIRMATION TEST 

    Result

    Proceed to
    NEXT

    Result: 

    NEXT 

    END 

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