LEMON Manuals: Even more car manuals for everyone
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 B165B: 2nd Seat Seat Belt Buckle Switch (RH) [10/2020 - 10/2023] >> Procedure

DTC B165B: 2nd Seat Seat Belt Buckle Switch (RH) [10/2020 - 10/2023]: Procedure

  1. CHECK VEHICLE CONDITION 
    1. Check vehicle condition.

      Result

      Proceed to
      for Fixed Seat Type
      for Power Seat

    Result: 

    for Power Seat 

    See step  10

    Result: 

    for Fixed Seat Type 

    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 pedestrian detection ECU assembly and rear seat inner with center belt assembly 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 pedestrian detection ECU assembly and rear seat inner with center belt assembly RH.
      GTY830481Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *1 Rear Seat Inner with Center Belt Assembly RH
      *2 Pedestrian Detection ECU Assembly
      *3 Rear Seat Wire RH
      *4 Floor Wire
      *5 Instrument Panel Wire
    2. Check that the connectors (on the pedestrian detection ECU assembly side and rear seat inner with center belt assembly 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 REAR SEAT WIRE RH OR INSTRUMENT PANEL WIRE 

    Result: 

    The connectors are not deformed or damaged 

    See step  4

  4. CHECK REAR SEAT INNER WITH CENTER BELT ASSEMBLY RH CIRCUIT 
    1. Connect the cable to the negative (-) auxiliary battery terminal, and wait for at least 2 seconds.
      GTY787369Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *1 Rear Seat Inner with Center Belt Assembly RH
      *2 Pedestrian Detection ECU Assembly
      *3 Rear Seat Wire RH
      *4 Floor Wire
      *5 Instrument Panel Wire
      *6 Service Wire
      *a Front view of wire harness connector
      (to Rear Seat Inner with Center Belt Assembly RH)
      *b Front view of wire harness connector
      (to Pedestrian Detection 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
      R15-1 - Body ground Power switch on (IG) Below 1 V
      R15-2 - 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 18 (RBR+) and 17 (RBR-) 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
      R15-1 - R15-2 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
      R15-1 - R15-2 Always 1 MΩ or higher
      R15-1 - Body ground Always 1 MΩ or higher
      R15-2 - Body ground Always 1 MΩ or higher

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    See step  8

    Result: 

    OK 

    See step  5

  5. CHECK DTC 
    1. Connect the connectors to the pedestrian detection ECU assembly and rear seat inner with center belt assembly RH.
      GTY783864Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *1 Rear Seat Inner with Center Belt Assembly RH
      *2 Pedestrian Detection ECU Assembly
    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.

      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 B165B is not output
      DTC B165B is output

      HINT: 

      Codes other than DTC B165B may be output at this time, but they are not related to this check.

    Result: 

    DTC B165B is not output 

    USE SIMULATION METHOD TO CHECK. Refer to  HOW TO PROCEED WITH TROUBLESHOOTING [10/2020 - 11/2021]  , or refer to  HOW TO PROCEED WITH TROUBLESHOOTING [11/2021 - 10/2022]  , or refer to  HOW TO PROCEED WITH TROUBLESHOOTING [10/2022 - 10/2023] 

    Result: 

    DTC B165B is output 

    See step  6

  6. REPLACE REAR SEAT INNER WITH CENTER BELT ASSEMBLY RH 
    1. Turn the power switch off.
    2. Disconnect the cable from the negative (-) auxiliary battery terminal, and wait for at least 60 seconds.
    3. Replace the rear seat inner with center belt assembly RH.

      Refer to REMOVAL [10/2020 - 11/2021] , or refer to REMOVAL [11/2021 - 10/2022] , or refer to REMOVAL [10/2022 - 10/2023]

      HINT: 

      Perform the inspection using parts from a normal vehicle if possible.

      Result

      Proceed to
      NEXT

    Result: 

    NEXT 

    See step  7

  7. CHECK DTC 
    1. Connect the cable to the negative (-) auxiliary battery terminal, and wait for at least 2 seconds.
      GTY783864Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *1 Rear Seat Inner with Center Belt Assembly RH
      *2 Pedestrian Detection ECU Assembly
    2. Turn the power switch on (IG), and wait for at least 60 seconds.
    3. Clear the DTCs.

      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 B165B is not output
      DTC B165B is output

      HINT: 

      Codes other than DTC B165B may be output at this time, but they are not related to this check.

    Result: 

    DTC B165B is not output 

    END (REAR SEAT INNER WITH CENTER BELT ASSEMBLY RH WAS DEFECTIVE) 

    Result: 

    DTC B165B is output 

    REPLACE AIRBAG ECU ASSEMBLY. Refer to  REMOVAL [10/2020 - 11/2021]  , or refer to  REMOVAL [11/2021 - 10/2022]  , or refer to  REMOVAL [10/2022 - 10/2023] 

  8. CHECK REAR SEAT INNER WITH CENTER BELT ASSEMBLY RH CIRCUIT 
    1. Connect the cable to the negative (-) auxiliary battery terminal, and wait for at least 2 seconds.
      GTY812631Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *1 Rear Seat Inner with Center Belt Assembly RH
      *2 Pedestrian Detection ECU Assembly
      *3 Rear Seat Wire RH
      *4 Floor Wire
      *5 Instrument Panel Wire
      *6 Service Wire
      *a Front view of wire harness connector
      (to Rear Seat Wire RH)
      *b Front view of wire harness connector
      (to Pedestrian Detection 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
      LR 5-2 (RBR+) - Body ground Power switch on (IG) Below 1 V
      LR 5-1 (RBR-) - 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 18 (RBR+) and 17 (RBR-) 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
      LR 5-2 (RBR+) - LR 5-1 (RBR-) 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
      LR 5-2 (RBR+) - LR 5-1 (RBR-) Always 1 MΩ or higher
      LR 5-2 (RBR+) - Body ground Always 1 MΩ or higher
      LR 5-1 (RBR-) - Body ground Always 1 MΩ or higher

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPLACE REAR SEAT WIRE RH 

    Result: 

    OK 

    See step  9

  9. CHECK INSTRUMENT PANEL WIRE 
    1. Connect the cable to the negative (-) auxiliary battery terminal, and wait for at least 2 seconds.
      GTY817770Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *1 Rear Seat Inner with Center Belt Assembly RH
      *2 Pedestrian Detection ECU Assembly
      *3 Rear Seat Wire RH
      *4 Floor Wire
      *5 Instrument Panel Wire
      *6 Service Wire
      *a Front view of wire harness connector
      (to Floor Wire)
      *b Front view of wire harness connector
      (to Pedestrian Detection 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
      GL 3-9 (RBR-) - Body ground Power switch on (IG) Below 1 V
      GL 3-10 (RBR+) - 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 18 (RBR+) and 17 (RBR-) 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
      GL 3-9 (RBR-) - GL 3-10 (RBR+) 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
      GL 3-9 (RBR-) - GL 3-10 (RBR+) Always 1 MΩ or higher
      GL 3-9 (RBR-) - Body ground Always 1 MΩ or higher
      GL 3-10 (RBR+) - Body ground Always 1 MΩ or higher

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    REPLACE FLOOR WIRE 

    Result: 

    NG 

    REPLACE INSTRUMENT PANEL WIRE 

  10. 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 pedestrian detection ECU assembly and rear seat inner belt assembly RH.

      Result

      Proceed to
      Connectors are properly connected
      Connectors are not properly connected

    Result: 

    Connectors are not properly connected 

    CONNECT CONNECTORS PROPERLY 

    Result: 

    Connectors are properly connected 

    See step  11

  11. CHECK CONNECTORS 
    1. Disconnect the connectors from the pedestrian detection ECU assembly and rear seat inner belt assembly RH.
      GTY830481Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *1 Rear Seat Inner Belt Assembly RH
      *2 Pedestrian Detection ECU Assembly
      *3 Rear Seat Wire RH
      *4 Floor Wire
      *5 Instrument Panel Wire
    2. Check that the connectors (on the pedestrian detection ECU assembly side and rear seat inner belt assembly RH side) are not damaged.

      Result

      Proceed to
      Connectors are not deformed or damaged
      Connectors are deformed or damaged

    Result: 

    Connectors are deformed or damaged 

    REPLACE REAR SEAT WIRE RH OR INSTRUMENT PANEL WIRE 

    Result: 

    Connectors are not deformed or damaged 

    See step  12

  12. CHECK REAR SEAT INNER BELT ASSEMBLY RH CIRCUIT 
    1. Connect the cable to the negative (-) auxiliary battery terminal, and wait for at least 2 seconds.
      GTY787369Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *1 Rear Seat Inner Belt Assembly RH
      *2 Pedestrian Detection ECU Assembly
      *3 Rear Seat Wire RH
      *4 Floor Wire
      *5 Instrument Panel Wire
      *6 Service Wire
      *a Front view of wire harness connector
      (to Rear Seat Inner Belt Assembly RH)
      *b Front view of wire harness connector
      (to Pedestrian Detection 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
      R15-1 - Body ground Power switch on (IG) Below 1 V
      R15-2 - 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 18 (RBR+) and 17 (RBR-) 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
      R15-1 - R15-2 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
      R15-1 - R15-2 Always 1 MΩ or higher
      R15-1 - Body ground Always 1 MΩ or higher
      R15-2 - Body ground Always 1 MΩ or higher

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    See step  16

    Result: 

    OK 

    See step  13

  13. CHECK DTC 
    1. Connect the connectors to the pedestrian detection ECU assembly and rear seat inner belt assembly RH.
      GTY783864Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *1 Rear Seat Inner Belt Assembly RH
      *2 Pedestrian Detection ECU Assembly
    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.

      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 B165B is not output
      DTC B165B is output

      HINT: 

      Codes other than DTC B165B may be output at this time, but they are not related to this check.

    Result: 

    DTC B165B is not output 

    USE SIMULATION METHOD TO CHECK. Refer to  HOW TO PROCEED WITH TROUBLESHOOTING [10/2020 - 11/2021]  , or refer to  HOW TO PROCEED WITH TROUBLESHOOTING [11/2021 - 10/2022]  , or refer to  HOW TO PROCEED WITH TROUBLESHOOTING [10/2022 - 10/2023] 

    Result: 

    DTC B165B is output 

    See step  14

  14. REPLACE REAR SEAT INNER BELT ASSEMBLY RH 
    1. Turn the power switch off.
    2. Disconnect the cable from the negative (-) auxiliary battery terminal, and wait for at least 60 seconds.
    3. Replace the rear seat inner belt assembly RH.

      Refer to REMOVAL [10/2020 - 11/2021] , or refer to REMOVAL [11/2021 - 10/2022] , or refer to REMOVAL [10/2022 - 10/2023]

      HINT: 

      Perform the inspection using parts from a normal vehicle if possible.

      Result

      Proceed to
      NEXT

    Result: 

    NEXT 

    See step  15

  15. CHECK DTC 
    1. Connect the cable to the negative (-) auxiliary battery terminal, and wait for at least 2 seconds.
      GTY783864Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *1 Rear seat inner belt assembly RH
      *2 Pedestrian Detection ECU Assembly
    2. Turn the power switch on (IG), and wait for at least 60 seconds.
    3. Clear the DTCs.

      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 B165B is not output
      DTC B165B is output

      HINT: 

      Codes other than DTC B165B may be output at this time, but they are not related to this check.

    Result: 

    DTC B165B is not output 

    END (REAR SEAT INNER BELT ASSEMBLY RH WAS DEFECTIVE) 

    Result: 

    DTC B165B is output 

    REPLACE AIRBAG ECU ASSEMBLY. Refer to  REMOVAL [10/2020 - 11/2021]  , or refer to  REMOVAL [11/2021 - 10/2022]  , or refer to  REMOVAL [10/2022 - 10/2023] 

  16. CHECK REAR SEAT INNER BELT ASSEMBLY RH CIRCUIT 
    1. Connect the cable to the negative (-) auxiliary battery terminal, and wait for at least 2 seconds.
      GTY812631Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *1 Rear Seat Inner Belt Assembly RH
      *2 Pedestrian Detection ECU Assembly
      *3 Rear Seat Wire RH
      *4 Floor Wire
      *5 Instrument Panel Wire
      *6 Service Wire
      *a Front view of wire harness connector
      (to Rear Seat Wire RH)
      *b Front view of wire harness connector
      (to Pedestrian Detection 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
      LR 5-2 (RBR+) - Body ground Power switch on (IG) Below 1 V
      LR 5-1 (RBR-) - 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 18 (RBR+) and 17 (RBR-) 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
      LR 5-2 (RBR+) - LR 5-1 (RBR-) 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
      LR 5-2 (RBR+) - LR 5-1 (RBR-) Always 1 MΩ or higher
      LR 5-2 (RBR+) - Body ground Always 1 MΩ or higher
      LR 5-1 (RBR-) - Body ground Always 1 MΩ or higher

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPLACE REAR SEAT WIRE RH 

    Result: 

    OK 

    See step  17

  17. CHECK INSTRUMENT PANEL WIRE 
    1. Connect the cable to the negative (-) auxiliary battery terminal, and wait for at least 2 seconds.
      GTY817770Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *1 Rear Seat Inner Belt Assembly RH
      *2 Pedestrian Detection ECU Assembly
      *3 Rear Seat Wire RH
      *4 Floor Wire
      *5 Instrument Panel Wire
      *6 Service Wire
      *a Front view of wire harness connector
      (to Floor Wire)
      *b Front view of wire harness connector
      (to Pedestrian Detection 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
      GL 3-9 (RBR-) - Body ground Power switch on (IG) Below 1 V
      GL 3-10 (RBR+) - 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 18 (RBR+) and 17 (RBR-) 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
      GL 3-9 (RBR-) - GL 3-10 (RBR+) 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
      GL 3-9 (RBR-) - GL 3-10 (RBR+) Always 1 MΩ or higher
      GL 3-9 (RBR-) - Body ground Always 1 MΩ or higher
      GL 3-10 (RBR+) - Body ground Always 1 MΩ or higher

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    REPLACE FLOOR WIRE 

    Result: 

    NG 

    REPLACE INSTRUMENT PANEL WIRE 

scientia non olet · About LEMON Manuals