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Home >> Lexus >> 2024 >> NX 250 FWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 119 (Smart Access System (For Entry) - Symptom Tests) >> SMART ACCESS SYSTEM WITH PUSH-BUTTON START (for Entry Function, HEV Model) >> Entry Exterior Alarm and Answer-back Buzzer do not Sound [11/2021 - ] >> Procedure

Entry Exterior Alarm and Answer-back Buzzer do not Sound [11/2021 - ]: Procedure

WARNING: This page is about a different car, the 2025 Lexus NX 350h, 2024 Lexus NX 350h, 2023 Lexus NX 350h, and 2022 Lexus NX 350h. However, it is still accessible from the selected car via links, so may be relevant.
  1. CHECK FOR DTC 
    1. Check for DTCs.

      Body Electrical > Vehicle Proximity Notification System > Trouble Codes 

      Result

      Result Proceed to
      B1350-13 and B1350-19 are not output A
      B1350-13 and B1350-19 are output B

    Result: 

    GO TO ACOUSTIC VEHICLE ALERTING SYSTEM. Refer to  HOW TO PROCEED WITH TROUBLESHOOTING [11/2021 - ] 

    Result: 

    See step  2

  2. CHECK CUSTOMIZE SETTING (WIRELESS BUZZER RESPONSE FUNCTION) 
    1. Read the customize setting according to the display on the GTS.

      Wireless Door Lock 

      Tester Display Description Default Setting ECU
      Wireless Buzzer Response Function Wireless buzzer response Enable $00:Disable, $01:Enable Main body ECU (multiplex network body ECU)

      Result

      Result Proceed to
      "Enable" is displayed A
      "Disable" is displayed B

    Result: 

    PERFORM CUSTOMIZE SETTING. Refer to  CUSTOMIZE PARAMETERS [11/2021 - ] 

    Result: 

    See step  3

  3. CHECK WIRELESS DOOR LOCK CONTROL SYSTEM 
    1. Check that the function operates normally.

      Refer to OPERATION CHECK [11/2021 - ]

      Result

      Result Proceed to
      Wireless door lock function operates normally A
      Wireless door lock function does not operate normally B

    Result: 

    GO TO WIRELESS DOOR LOCK CONTROL SYSTEM. Refer to  HOW TO PROCEED WITH TROUBLESHOOTING [11/2021 - ] 

    Result: 

    See step  4

  4. READ VALUE USING GTS (EACH UNLOCK DETECTION SWITCH) 
    1. Read the Data List according to the display on the GTS.

      Body Electrical > Main Body > Data List 

      Tester Display Measurement Item Range Normal Condition Diagnostic Note
      FR Door Lock Position Switch Status Front door RH unlock detection switch signal Unlock or Lock Unlock: Front door RH unlocked
      Lock: Front door RH locked
      -
      FL Door Lock Position Switch Status Front door LH unlock detection switch signal Unlock or Lock Unlock: Front door LH unlocked
      Lock: Front door LH locked
      -
      RR Door Lock Position Switch Status Rear door RH unlock detection switch signal Unlock or Lock Unlock: Rear door RH locked
      Lock: Rear door RH unlocked
      -
      RL Door Lock Position Switch Status Rear door LH unlock detection switch signal Unlock or Lock Unlock: Rear door LH locked
      Lock: Rear door LH unlocked
      -

      Body Electrical > Main Body > Data List 

      Tester Display
      FR Door Lock Position Switch Status
      FL Door Lock Position Switch Status
      RR Door Lock Position Switch Status
      RL Door Lock Position Switch Status

      OK

      The GTS display changes correctly in response to the lock/unlock operation.

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY). Refer to  REMOVAL [11/2021 - ] 

    Result: 

    NG 

    GO TO E-LATCH SYSTEM. Refer to  HOW TO PROCEED WITH TROUBLESHOOTING [11/2021 - ]