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Home >> Lexus >> 2020 >> ES 300h Luxury >> Repair and Diagnosis >> External Pages >> Different car >> Section 64 (Blind Spot Monitor System (Except Hybrid) - Diagnostic Codes & Circuit Tests) >> BLIND SPOT MONITOR SYSTEM (for Gasoline Model) >> DTC C1ABE: Short to GND or Open in Buzzer [06/2018 - ] >> Procedure

DTC C1ABE: Short to GND or Open in Buzzer [06/2018 - ]: Procedure

WARNING: This page does not describe the selected car, but rather 10 other vehicles, including the 2024 Lexus ES 350, 2024 Lexus ES 250, 2023 Lexus ES 350, 2023 Lexus ES 250, and 2022 Lexus ES 350. However, it is still accessible from the selected car via links, so may be relevant.
  1. READ VALUE USING TECHSTREAM (BLIND SPOT MONITOR SENSOR LH STATUS) 
    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 / Blind Spot Monitor Slave / Data List.
    5. Read the Data List according to the display on the Techstream.

      Body Electrical > Blind Spot Monitor Slave > Data List 

      Tester Display Measurement Item Range Normal Condition Diagnostic Note
      Buzzer Connection Status of the buzzer connection Valid or Invalid Valid: Buzzer connection is valid
      Invalid: Buzzer connection is invalid      		 -
      Slave Side RCTA Function Switches the RCTA function on and off OFF or ON OFF: RCTA function off
      ON: RCTA function on      		 -

      Body Electrical > Blind Spot Monitor Slave > Data List 

      Tester Display
      Buzzer Connection
      Slave Side RCTA Function

      Result

      Result Proceed to
      "Valid" and "ON" is displayed for all items. A
      "Invalid" or "OFF" is displayed. B

    Result: 

    B 

    REPLACE BLIND SPOT MONITOR SENSOR LH. Refer to  REMOVAL [06/2018 - 08/2021]  , or refer to  REMOVAL [08/2021 - 09/2022]  , or refer to  REMOVAL [09/2022 - ] 

    Result: 

    A 

    See step  2

  2. CHECK DTC 
    1. Turn the engine switch off.
    2. Turn the engine switch on (IG).
    3. Recheck for DTCs and check if the same DTC is output again.

      Body Electrical > Blind Spot Monitor Slave > Trouble Codes 

      OK

      No DTCs are output.

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    USE SIMULATION METHOD TO CHECK. Refer to  HOW TO PROCEED WITH TROUBLESHOOTING [06/2018 - ] 

    Result: 

    NG 

    See step  3

  3. CHECK HARNESS AND CONNECTOR (RCTA BUZZER - BATTERY AND BLIND SPOT MONITOR SENSOR LH) 
    1. Disconnect the N28 RCTA buzzer (blind spot monitor buzzer) connector.
    2. Disconnect the R5 blind spot monitor sensor LH connector.
    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      N28-2 (BZN) - R5-3 (BUZ) Always Below 1 Ω
      N28-2 (BZN) or R5-3 (BUZ) - Body ground Always 10 kΩ or higher
    4. Measure the voltage according to the value(s) in the table below.

      Standard Voltage

      Tester Connection Condition Specified Condition
      N28-1 (BZP) - Body ground Engine switch on (IG) 11 to 14 V
      N28-1 (BZP) - Body ground Engine switch off Below 1 V

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    REPLACE RCTA BUZZER (BLIND SPOT MONITOR BUZZER). Refer to  REMOVAL [06/2018 - 08/2021]  , or refer to  REMOVAL [08/2021 - 09/2022]  , or refer to  REMOVAL [09/2022 - ] 

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

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