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Home >> Lexus >> 2022 >> LS 500h AWD >> Repair and Diagnosis >> Restraints >> Air Bag, SRS >> Airbag System (W/O Advanced Park) - Diagnostic Codes (2 Of 3) >> AIRBAG SYSTEM (w/o Advanced Park) >> DTC B163B: Side Airbag Sensor Assembly No. 2 Lost Communication (LH); DTC B163C: Side Airbag Sensor Assembly No. 2 Initialization Error (LH) [10/2020 - 11/2021] >> Procedure

DTC B163B: Side Airbag Sensor Assembly No. 2 Lost Communication (LH); DTC B163C: Side Airbag Sensor Assembly No. 2 Initialization Error (LH) [10/2020 - 11/2021]: Procedure

  1. CHECK CONNECTION OF CONNECTORS 
    1. Turn the power switch off.
    2. Disconnect the cable from the negative (-) auxiliary battery terminal, and wait for at least 60 seconds.
    3. Check that the connectors are properly connected to the airbag ECU assembly and No. 2 side airbag sensor assembly LH.

      Result

      Proceed to
      The connectors are properly connected
      The connectors are not properly connected

    Result: 

    The connectors are not properly connected 

    CONNECT CONNECTORS PROPERLY 

    Result: 

    The connectors are properly connected 

    See step  2

  2. CHECK CONNECTORS 
    1. Disconnect the connectors from the airbag ECU assembly and No. 2 side airbag sensor assembly LH.
    2. Check that the connectors (on the airbag ECU assembly side and No. 2 side airbag sensor assembly LH side) are not damaged.
      GTY816487Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *1 No. 2 Side Airbag Sensor Assembly LH
      *2 Airbag ECU Assembly
      *3 Floor Wire

      Result

      Proceed to
      The connectors are not deformed or damaged
      The connectors are deformed or damaged

    Result: 

    The connectors are deformed or damaged 

    REPLACE FLOOR WIRE 

    Result: 

    The connectors are not deformed or damaged 

    See step  3

  3. CHECK FLOOR WIRE 
    1. Connect the cable to the negative (-) auxiliary battery terminal, and wait for at least 2 seconds.
      GTY806457Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *1 No. 2 Side Airbag Sensor Assembly LH
      *2 Airbag ECU Assembly
      *3 Floor Wire
      *4 Service Wire
      *a Front view of wire harness connector
      (to No. 2 Side Airbag Sensor Assembly LH)
      *b Front view of wire harness connector
      (to Airbag ECU Assembly)
    2. Turn the power switch on (IG).
    3. Measure the voltage according to the value(s) in the table below.

      Standard Voltage

      Tester Connection Switch Condition Specified Condition
      L98-2 (BFL+) - Body ground Power switch on (IG) Below 1 V
      L98-1 (BFL-) - Body ground Power switch on (IG) Below 1 V
    4. Turn the power switch off.
    5. Disconnect the cable from the negative (-) auxiliary battery terminal, and wait for at least 60 seconds.
    6. Using a service wire, connect terminals 29 (BCL+) and 30 (BCL-) of connector B.
      NOTE:

      Do not forcibly insert the service wire into the terminals of the connector when connecting a service wire.

    7. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      L98-2 (BFL+) - L98-1 (BFL-) Always Below 1 Ω
    8. Disconnect the service wire from connector B.
    9. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      L98-2 (BFL+) - L98-1 (BFL-) Always 1 MΩ or higher
      L98-2 (BFL+) - Body ground Always 1 MΩ or higher
      L98-1 (BFL-) - Body ground Always 1 MΩ or higher

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPLACE FLOOR WIRE 

    Result: 

    OK 

    See step  4

  4. CHECK NO. 2 SIDE AIRBAG SENSOR ASSEMBLY LH 
    1. Connect the connectors to the airbag ECU assembly.
    2. Interchange the No. 2 side airbag sensor assembly LH with RH and connect the connectors to them.
      GTY795368Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *1 No. 2 Side Airbag Sensor Assembly RH
      *2 Airbag ECU Assembly
    3. Connect the cable to the negative (-) auxiliary battery terminal, and wait for at least 2 seconds.
    4. Turn the power switch on (IG), and wait for at least 60 seconds.
    5. Clear the DTCs stored in memory.

      Refer to DTC CHECK / CLEAR [10/2020 - 10/2023]

      Body Electrical > SRS Airbag > Clear DTCs 

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

      Refer to DTC CHECK / CLEAR [10/2020 - 10/2023]

      Body Electrical > SRS Airbag > Trouble Codes 

      Result

      Proceed to
      DTC B163B or B163C is output
      DTC B162B or B162C is output
      DTC B162B, B162C, B163B and B163C are not output

      HINT: 

      Codes other than DTC B162B, B162C, B163B and B163C may be output at this time, but they are not related to this check.

    9. Turn the power switch off.
    10. Disconnect the cable from the negative (-) auxiliary battery terminal, and wait for at least 60 seconds.
    11. Return the side airbag sensor assembly RH and LH to their original positions and connect the connectors to them.

    Result: 

    DTC B163B or B163C is output 

    REPLACE AIRBAG ECU ASSEMBLY. Refer to  REMOVAL [10/2020 - 11/2021] 

    Result: 

    DTC B162B or B162C is output 

    REPLACE NO. 2 SIDE AIRBAG SENSOR ASSEMBLY LH. Refer to  REMOVAL [10/2020 - 11/2021] 

    Result: 

    DTC B162B, B162C, B163B and B163C are not output 

    USE SIMULATION METHOD TO CHECK. Refer to  HOW TO PROCEED WITH TROUBLESHOOTING [10/2020 - 11/2021] 

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