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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 B166D: Lost Communication with Front Door Pressure Sensor RH; DTC B166E: Front Door Pressure Sensor RH Initialization Incomplete [10/2020 - 11/2021] >> Procedure

DTC B166D: Lost Communication with Front Door Pressure Sensor RH; DTC B166E: Front Door Pressure Sensor RH Initialization Incomplete [10/2020 - 11/2021]: Procedure

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

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

      Body Electrical > SRS Airbag > Clear DTCs 

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

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

      Body Electrical > SRS Airbag > Trouble Codes 

      Result

      Proceed to
      DTC B166D or B166E is output
      DTC B166D, B166E, B167B and B167C are not output

      HINT: 

      Codes other than DTC B166D, B166E, B167B and B167C may be output at this time, but they are not related to this check.

    Result: 

    DTC B166D, B166E, B167B and B167C are not output 

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

    Result: 

    DTC B166D or B166E is output 

    See step  2

  2. 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 rear airbag sensor RH and door side airbag sensor RH.

      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  3

  3. CHECK CONNECTORS 
    1. Disconnect the connectors from the side airbag sensor assembly RH and door side airbag sensor RH.
      GTY838284Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *1 Door Side Airbag Sensor RH
      *2 Side Airbag Sensor Assembly RH
      *3 Front Door Wire RH
      *4 Floor Wire
    2. Check that the connectors (on the side airbag sensor assembly RH side and door side airbag sensor RH side) are not damaged.

      Result

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

    Result: 

    The connectors are deformed or damaged 

    REPLACE FRONT DOOR WIRE RH OR FLOOR WIRE 

    Result: 

    The connectors are not deformed or damaged 

    See step  4

  4. CHECK DOOR SIDE AIRBAG SENSOR RH CIRCUIT 
    1. Connect the cable to the negative (-) auxiliary battery terminal, and wait for at least 2 seconds.
      GTY818016Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *1 Door Side Airbag Sensor RH
      *2 Side Airbag Sensor Assembly RH
      *3 Front Door Wire RH
      *4 Floor Wire
      *5 Service Wire
      *a Front view of wire harness connector
      (to Door Side Airbag Sensor RH)
      *b Front view of wire harness connector
      (to Side Airbag Sensor Assembly RH)
    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
      H9-2 (BDR+) - Body ground Power switch on (IG) Below 1 V
      H9-1 (BDR-) - 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 1 (BDR+) and 2 (BDR-) 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
      H9-2 (BDR+) - H9-1 (BDR-) 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
      H9-2 (BDR+) - H9-1 (BDR-) Always 1 MΩ or higher
      H9-2 (BDR+) - Body ground Always 1 MΩ or higher
      H9-1 (BDR-) - Body ground Always 1 MΩ or higher

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    See step  7

    Result: 

    OK 

    See step  5

  5. CHECK DOOR SIDE AIRBAG SENSOR RH 
    1. Connect the connector to the side airbag sensor assembly RH and door side airbag sensor RH.
      GTY801997Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *1 Door Side Airbag Sensor LH
      *2 Side Airbag Sensor Assembly RH
    2. Interchange the door side airbag sensor RH with LH and connect the connectors to them.
    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.

      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 B166D or B166E is output
      DTC B167B or B167C is output
      DTC B166D, B166E, B167B and B167C are not output

      HINT: 

      Codes other than DTC B166D, B166E, B167B and B167C 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 door side airbag sensor LH and RH to their original positions and connect the connectors to them.

    Result: 

    DTC B167B or B167C is output 

    REPLACE REAR AIRBAG SENSOR RH. Refer to  REMOVAL [10/2020 - 11/2021] 

    Result: 

    DTC B166D, B166E, B167B and B167C are not output 

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

    Result: 

    DTC B166D or B166E is output 

    See step  6

  6. CHECK SIDE AIRBAG SENSOR ASSEMBLY RH 
    1. Interchange the side airbag sensor assembly RH with LH and connect the connectors to them.
      GTY810198Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *1 Side Airbag Sensor Assembly LH
      *2 Rear Airbag Sensor RH
    2. Connect the cable to the negative (-) auxiliary battery terminal, and wait for at least 2 seconds.
    3. Turn the power switch on (IG), and wait for at least 60 seconds.
    4. Clear the DTCs stored.

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

      Body Electrical > SRS Airbag > Clear DTCs 

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

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

      Body Electrical > SRS Airbag > Trouble Codes 

      Result

      Proceed to
      DTC B166D or B166E is output
      DTC B167B or B167C is output
      DTC B166D, B166E, B167B and B167C are not output

      HINT: 

      Codes other than DTC B166D, B167E, B167B and B167C may be output at this time, but they are not related to this check.

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

    Result: 

    DTC B166D or B166E is output 

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

    Result: 

    DTC B167B or B167C is output 

    REPLACE SIDE AIRBAG SENSOR ASSEMBLY RH. Refer to  REMOVAL [10/2020 - 11/2021] 

    Result: 

    DTC B166D, B166E, B167B and B167C are not output 

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

  7. CHECK FLOOR WIRE 
    1. Disconnect the floor wire connector from the front door wire RH.
      GTY971915Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *1 Door Side Airbag Sensor RH
      *2 Side Airbag Sensor Assembly RH
      *3 Front Door Wire RH
      *4 Floor Wire
      *5 Service Wire
      *a Front view of wire harness connector
      (to Front Door Wire RH)
      *b Front view of wire harness connector
      (to Side Airbag Sensor Assembly RH)
    2. Connect the cable to the negative (-) auxiliary battery terminal, and wait for at least 2 seconds.
    3. Turn the power switch on (IG).
    4. Measure the voltage according to the value(s) in the table below.

      Standard Voltage

      Tester Connection Switch Condition Specified Condition
      L227-12 (BDR+) - Body ground Power switch on (IG) Below 1 V
      L227-22 (BDR-) - Body ground Power switch on (IG) Below 1 V
    5. Turn the power switch off.
    6. Disconnect the cable from the negative (-) auxiliary battery terminal, and wait for at least 60 seconds.
    7. Using a service wire, connect terminals 1 (BDR+) and 2 (BDR-) of connector B.
      NOTE:

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

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

      Standard Resistance

      Tester Connection Condition Specified Condition
      L227-12 (BDR+) - L227-22 (BDR-) Always Below 1 Ω
    9. Disconnect the service wire from connector B.
    10. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      L227-12 (BDR+) - L227-22 (BDR-) Always 1 MΩ or higher
      L227-12 (BDR+) - Body ground Always 1 MΩ or higher
      L227-22 (BDR-) - Body ground Always 1 MΩ or higher

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    REPLACE FRONT DOOR WIRE RH 

    Result: 

    NG 

    REPLACE FLOOR WIRE 

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