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Home >> Toyota >> 2020 >> Avalon Limited >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 53 (Supplemental Restraint System - Diagnostic Codes (B1160-B1653) (Hybrid)) >> AIRBAG SYSTEM (for HV Model) >> DTC B163B: Side Airbag Sensor Assembly No. 2 Lost Communication (LH); DTC B163C: Side Airbag Sensor Assembly No. 2 Initialization Error (LH) [04/2018 -] >> Procedure

DTC B163B: Side Airbag Sensor Assembly No. 2 Lost Communication (LH); DTC B163C: Side Airbag Sensor Assembly No. 2 Initialization Error (LH) [04/2018 -]: Procedure

WARNING: This page is about a different variant/trim than selected.
  1. CHECK CONNECTION OF CONNECTORS 
    1. Turn the power switch off.
    2. Disconnect the cable from the negative (-) auxiliary battery terminal.
      WARNING:

      Wait at least 90 seconds after disconnecting the cable from the negative (-) auxiliary battery terminal to disable the SRS system.

    3. Check that the connectors are properly connected to the airbag ECU assembly and side No. 1 airbag sensor LH.

      OK

      The connectors are properly connected.

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    CONNECT CONNECTORS PROPERLY 

    Result: 

    OK 

    See step  2

  2. CHECK CONNECTORS 
    1. Disconnect the connectors from the airbag ECU assembly and side No. 1 airbag sensor LH.
    2. Check that the terminals of the connectors are not deformed or damaged.

      OK

      The terminals are not deformed or damaged.

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPLACE FLOOR WIRE 

    Result: 

    OK 

    See step  3

  3. CHECK FLOOR WIRE 
    1. Connect the cable to the negative (-) auxiliary battery terminal.
      GTY839600Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *1 Side No. 1 Airbag Sensor LH
      *2 Airbag ECU Assembly
      *3 Floor Wire
      *4 Service Wire
      *a Front view of wire harness connector
      (to Airbag ECU Assembly)
      *b Front view of wire harness connector
      (to Side No. 1 Airbag Sensor LH)
    2. Turn the power switch on (IG).
    3. Measure the voltage according to the value(s) in the table below.

      Standard Voltage

      Tester Connection Condition Specified Condition
      K33-2 (BFL+) - Body ground Power switch on (IG) Below 1 V
      K33-1 (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.
      WARNING:

      Wait at least 90 seconds after disconnecting the cable from the negative (-) auxiliary battery terminal to disable the SRS system.

    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 the wire.

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

      Standard Resistance

      Tester Connection Condition Specified Condition
      K33-2 (BFL+) - K33-1 (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
      K33-2 (BFL+) - K33-1 (BFL-) Always 1 MΩ or higher
      K33-2 (BFL+) - Body ground Always 1 MΩ or higher
      K33-1 (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 SIDE NO. 1 AIRBAG SENSOR LH 
    1. Connect the connector to the airbag ECU assembly.
      GTY447346Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *1 Side No. 1 Airbag Sensor RH
      *2 Airbag ECU Assembly
    2. Interchange the side No. 1 airbag sensor LH with RH and connect the connectors.
    3. Connect the cable to the negative (-) auxiliary battery terminal.
    4. Turn the power switch on (IG), and wait for at least 60 seconds.
    5. Clear the DTCs stored in memory.

      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.

      Body Electrical > SRS Airbag > Trouble Codes 

      HINT: 

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

      Result

      Result Proceed to
      DTC B163B or B163C is output. A
      DTC B162B or B162C is output. B
      DTCs B162B, B162C, B163B and B163C are not output. C
    9. Turn the power switch off.
    10. Disconnect the cable from the negative (-) auxiliary battery terminal.
      WARNING:

      Wait at least 90 seconds after disconnecting the cable from the negative (-) auxiliary battery terminal to disable the SRS system.

    11. Return the side No. 1 airbag sensor LH and RH to their original positions and connect the connectors.

    Result: 

    A 

    REPLACE AIRBAG ECU ASSEMBLY. Refer to  REMOVAL [04/2018 - 08/2020]  , or refer to  REMOVAL [08/2020 - 08/2021]  , or refer to  REMOVAL [08/2021 -] 

    Result: 

    B 

    REPLACE SIDE NO. 1 AIRBAG SENSOR LH. Refer to  REMOVAL [04/2018 - 08/2020]  , or refer to  REMOVAL [08/2020 - 08/2021]  , or refer to  REMOVAL [08/2021 -] 

    Result: 

    C 

    USE SIMULATION METHOD TO CHECK. Refer to  HOW TO PROCEED WITH TROUBLESHOOTING [04/2018 -] 

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