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Home >> Lexus >> 2023 >> LS 500h >> 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 B1642: Side Satellite Sensor Bus Lost Communication (RH); DTC B1643: Side Satellite Sensor Bus Initialization Error (RH) [10/2020 - 11/2021] >> Procedure

DTC B1642: Side Satellite Sensor Bus Lost Communication (RH); DTC B1643: Side Satellite Sensor Bus Initialization Error (RH) [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. Check for DTCs.

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

      Body Electrical > SRS Airbag > Trouble Codes 

      Result

      Proceed to
      DTC B1642 or B1643 is output
      DTC B1642 and B1643 are not output

      HINT: 

      Codes other than DTC B1642 and B1643 may be output at this time, but they are not related to this check.

    Result: 

    DTC B1642 and B1643 are not output 

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

    Result: 

    DTC B1642 or B1643 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 airbag ECU assembly and rear 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 airbag ECU assembly and rear airbag sensor RH.
    2. Check that the connectors (on the airbag ECU assembly side and rear airbag sensor RH side) are not damaged.
      GTY771009Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *1 Rear Airbag Sensor RH
      *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  4

  4. CHECK FLOOR WIRE 
    1. Connect the cable to the negative (-) auxiliary battery terminal, and wait for at least 2 seconds.
      GTY834079Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *1 Rear Airbag Sensor RH
      *2 Airbag ECU Assembly
      *3 Floor Wire
      *4 Service Wire
      *a Front view of wire harness connector
      (to Rear Airbag Sensor RH)
      *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
      L33-4 (BCR+) - Body ground Power switch on (IG) Below 1 V
      L33-3 (BCR-) - 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 25 (BBR+) and 26 (BBR-) 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
      L33-4 (BCR+) - L33-3 (BCR-) 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
      L33-4 (BCR+) - L33-3 (BCR-) Always 1 MΩ or higher
      L33-4 (BCR+) - Body ground Always 1 MΩ or higher
      L33-3 (BCR-) - Body ground Always 1 MΩ or higher

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPLACE FLOOR WIRE 

    Result: 

    OK 

    See step  5

  5. CHECK REAR AIRBAG SENSOR RH 
    1. Connect the connector to the airbag ECU assembly.
      GTY780299Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *1 Rear Airbag Sensor LH
      *2 Airbag ECU Assembly
    2. Interchange the side rear 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 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 B1642 or B1643 is output
      DTC B1647 or B1648 is output
      DTC B1642, B1643, B1647 and B1648 are not output

      HINT: 

      Codes other than DTC B1642, B1643, B1647 and B1648 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 rear airbag sensor LH and RH to their original positions and connect the connectors to them.

    Result: 

    DTC B1647 or B1648 is output 

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

    Result: 

    DTC B1642, B1643, B1647 and B1648 are not output 

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

    Result: 

    DTC B1642 or B1643 is output 

    See step  6

  6. CHECK CONNECTION OF CONNECTOR 
    1. Check that the connector is properly connected to the side airbag sensor assembly RH.

      Result

      Proceed to
      The connector is properly connected
      The connector is not properly connected

    Result: 

    The connector is not properly connected 

    CONNECT CONNECTOR PROPERLY 

    Result: 

    The connector is properly connected 

    See step  7

  7. CHECK CONNECTOR 
    1. Disconnect the connectors from the side airbag sensor assembly RH and rear airbag sensor RH.
    2. Check that the connector (on the side airbag sensor assembly RH side) is not damaged.
      GTY832782Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *1 Side Airbag Sensor Assembly RH
      *2 Rear Airbag Sensor RH
      *3 Floor Wire

      Result

      Proceed to
      The connector is not deformed or damaged
      The connector is deformed or damaged

    Result: 

    The connector is deformed or damaged 

    REPLACE FLOOR WIRE 

    Result: 

    The connector is not deformed or damaged 

    See step  8

  8. CHECK FLOOR WIRE 
    1. Connect the cable to the negative (-) auxiliary battery terminal, and wait for at least 2 seconds.
      GTY778445Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *1 Side Airbag Sensor Assembly RH
      *2 Rear Airbag Sensor RH
      *3 Floor Wire
      *4 Service Wire
      *a Front view of wire harness connector
      (to Side Airbag Sensor Assembly RH)
      *b Front view of wire harness connector
      (to Rear Airbag Sensor 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
      L39-3 (BBR-) - Body ground Power switch on (IG) Below 1 V
      L39-4 (BBR+) - 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 (BBR+) and 2 (BBR-) 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
      L39-3 (BBR-) - L39-4 (BBR+) 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
      L39-3 (BBR-) - L39-4 (BBR+) Always 1 MΩ or higher
      L39-3 (BBR-) - Body ground Always 1 MΩ or higher
      L39-4 (BBR+) - Body ground Always 1 MΩ or higher

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPLACE FLOOR WIRE 

    Result: 

    OK 

    See step  9

  9. CHECK SIDE AIRBAG SENSOR ASSEMBLY RH 
    1. Connect the connector to the rear airbag sensor RH.
      GTY810198Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *1 Side Airbag Sensor Assembly LH
      *2 Rear Airbag Sensor RH
    2. Interchange the side airbag sensor assembly 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 B1642 or B1643 is output
      DTC B1647 or B1648 is output
      DTC B1642, B1643, B1647 and B1648 are not output

      HINT: 

      Codes other than DTC B1642, B1643, B1647 and B1648 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 LH and RH to their original positions and connect the connectors to them.

    Result: 

    DTC B1647 or B1648 is output 

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

    Result: 

    DTC B1642, B1643, B1647 and B1648 are not output 

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

    Result: 

    DTC B1642 or B1643 is output 

    See step  10

  10. CHECK CONNECTION OF CONNECTOR 
    1. Check that the connector is properly connected to the door side airbag sensor RH.

      Result

      Proceed to
      The connector is properly connected
      The connector is not properly connected

    Result: 

    The connector is not properly connected 

    CONNECT CONNECTOR PROPERLY 

    Result: 

    The connector is properly connected 

    See step  11

  11. CHECK CONNECTOR 
    1. Disconnect the connectors from the side airbag sensor assembly RH and door side airbag sensor RH.
    2. Check that the connector (on the door side airbag sensor RH side) is not damaged.
      GTY516344Courtesy 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

      Result

      Proceed to
      The connector is not deformed or damaged
      The connector is deformed or damaged

    Result: 

    The connector is deformed or damaged 

    REPLACE FRONT DOOR WIRE RH 

    Result: 

    The connector is not deformed or damaged 

    See step  12

  12. 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  14

    Result: 

    OK 

    See step  13

  13. CHECK DOOR SIDE AIRBAG SENSOR RH 
    1. Connect the connector to the side airbag sensor assembly 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 B1642 or B1643 is output
      DTC B1647 or B1648 is output
      DTC B1642, B1643, B1647 and B1648 are not output

      HINT: 

      Codes other than DTC B1642, B1643, B1647 and B1648 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 B1642 or B1643 is output 

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

    Result: 

    DTC B1647 or B1648 is output 

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

    Result: 

    DTC B1642, B1643, B1647 and B1648 are not output 

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

  14. 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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