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Home >> Lexus >> 2021 >> LC 500 2D Coupe >> Repair and Diagnosis >> Restraints >> Air Bag, SRS >> Airbag System - Diagnostic Codes (Coupe) (1 Of 5) >> Airbag System >> DTC B1630/23: Rear Airbag Sensor RH Circuit Malfunction; DTC B1632/81: Lost Communication with Rear Airbag Sensor RH; DTC B1635/24: Rear Airbag Sensor LH Circuit Malfunction; DTC B1637/82: Lost Communication with Rear Airbag Sensor LH [03/2017 - 04/2020] >> Procedure

DTC B1630/23: Rear Airbag Sensor RH Circuit Malfunction; DTC B1632/81: Lost Communication with Rear Airbag Sensor RH; DTC B1635/24: Rear Airbag Sensor LH Circuit Malfunction; DTC B1637/82: Lost Communication with Rear Airbag Sensor LH [03/2017 - 04/2020]: Procedure

  1. CHECK DTC 
    1. Turn the engine switch on (IG), and wait for at least 60 seconds.
    2. Clear the DTCs stored in memory.

      Refer to DTC CHECK / CLEAR [03/2017 - 04/2020]

      Body Electrical > SRS Airbag > Clear DTCs 

    3. Turn the engine switch off.
    4. Turn the engine switch on (IG), and wait for at least 60 seconds.
    5. Check for DTCs.

      Refer to DTC CHECK / CLEAR [03/2017 - 04/2020]

      Body Electrical > SRS Airbag > Trouble Codes 

      Result

      Proceed to
      DTC B1635/24 or B1637/82 is output
      DTC B1630/23 or B1632/81 is output
      DTC B1630/23, B1632/81, B1635/24 and B1637/82 are not output

      HINT: 

      Codes other than DTC B1630/23, B1632/81, B1635/24 and B1637/82 may be output at this time, but they are not related to this check.

    Result: 

    DTC B1630/23 or B1632/81 is output 

    See step  3

    Result: 

    DTC B1630/23, B1632/81, B1635/24 and B1637/82 are not output 

    USE SIMULATION METHOD TO CHECK. Refer to  HOW TO PROCEED WITH TROUBLESHOOTING [03/2017 - 04/2020] 

    Result: 

    DTC B1635/24 or B1637/82 is output 

    See step  2

  2. CHECK REAR AIRBAG SENSOR LH 
    1. Turn the engine switch off.
      GTY498708Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *1 Rear Airbag Sensor RH
      *2 Airbag ECU Assembly
    2. Disconnect the cable from the negative (-) battery terminal, and wait for at least 90 seconds.
    3. Interchange the rear airbag sensor LH with RH and connect the connectors to them.
    4. Connect the cable to the negative (-) battery terminal, and wait for at least 2 seconds.
    5. Turn the engine switch on (IG), and wait for at least 60 seconds.
    6. Clear the DTCs stored in memory.

      Refer to DTC CHECK / CLEAR [03/2017 - 04/2020]

      Body Electrical > SRS Airbag > Clear DTCs 

    7. Turn the engine switch off.
    8. Turn the engine switch on (IG), and wait for at least 60 seconds.
    9. Check for DTCs.

      Refer to DTC CHECK / CLEAR [03/2017 - 04/2020]

      Body Electrical > SRS Airbag > Trouble Codes 

      Result

      Proceed to
      DTC B1630/23 or B1632/81 is output
      DTC B1635/24 or B1637/82 is output
      DTC B1630/23, B1632/81, B1635/24 and B1637/82 are not output

      HINT: 

      Codes other than DTC B1630/23, B1632/81, B1635/24 and B1637/82 may be output at this time, but they are not related to this check.

    10. Turn the engine switch off.
    11. Disconnect the cable from the negative (-) battery terminal, and wait for at least 90 seconds.
    12. Return the rear airbag sensor RH and LH to their original positions and connect the connectors to them.

    Result: 

    DTC B1630/23 or B1632/81 is output 

    REPLACE REAR AIRBAG SENSOR LH. Refer to  REMOVAL [03/2017 - 05/2023] 

    Result: 

    DTC B1635/24 or B1637/82 is output 

    REPLACE AIRBAG ECU ASSEMBLY. Refer to  REMOVAL [03/2017 - 05/2023] 

    Result: 

    DTC B1630/23, B1632/81, B1635/24 and B1637/82 are not output 

    USE SIMULATION METHOD TO CHECK. Refer to  HOW TO PROCEED WITH TROUBLESHOOTING [03/2017 - 04/2020] 

  3. CHECK REAR AIRBAG SENSOR RH 
    1. Turn the engine switch off.
      GTY505878Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *1 Rear Airbag Sensor LH
      *2 Airbag ECU Assembly
    2. Disconnect the cable from the negative (-) battery terminal, and wait for at least 90 seconds.
    3. Interchange the rear airbag sensor RH with LH and connect the connectors to them.
    4. Connect the cable to the negative (-) battery terminal, and wait for at least 2 seconds.
    5. Turn the engine switch on (IG), and wait for at least 60 seconds.
    6. Clear the DTCs stored in memory.

      Refer to DTC CHECK / CLEAR [03/2017 - 04/2020]

      Body Electrical > SRS Airbag > Clear DTCs 

    7. Turn the engine switch off.
    8. Turn the engine switch on (IG), and wait for at least 60 seconds.
    9. Check for DTCs.

      Refer to DTC CHECK / CLEAR [03/2017 - 04/2020]

      Body Electrical > SRS Airbag > Trouble Codes 

      Result

      Proceed to
      DTC B1635/24 or B1637/82 is output
      DTC B1630/23 or B1632/81 is output
      DTC B1630/23, B1632/81, B1635/24 and B1637/82 are not output

      HINT: 

      Codes other than DTC B1630/23, B1632/81, B1635/24 and B1637/82 may be output at this time, but they are not related to this check.

    10. Turn the engine switch off.
    11. Disconnect the cable from the negative (-) battery terminal, and wait for at least 90 seconds.
    12. Return the rear airbag sensor LH and RH to their original positions and connect the connectors to them.

    Result: 

    DTC B1635/24 or B1637/82 is output 

    REPLACE REAR AIRBAG SENSOR RH. Refer to  REMOVAL [03/2017 - 05/2023] 

    Result: 

    DTC B1630/23 or B1632/81 is output 

    REPLACE AIRBAG ECU ASSEMBLY. Refer to  REMOVAL [03/2017 - 05/2023] 

    Result: 

    DTC B1630/23, B1632/81, B1635/24 and B1637/82 are not output 

    USE SIMULATION METHOD TO CHECK. Refer to  HOW TO PROCEED WITH TROUBLESHOOTING [03/2017 - 04/2020] 

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