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Home >> Toyota >> 2022 >> RAV4 LE, FWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 77 (Airbag System (W/ OCS) - Diagnostic Codes (2 Of 4)) >> AIRBAG SYSTEM (w/ Occupant Classification System) >> DTC B1642: Side Satellite Sensor Bus Lost Communication (RH); DTC B1643: Side Satellite Sensor Bus Initialization Error (RH) [02/2019 - 08/2020] >> Procedure

DTC B1642: Side Satellite Sensor Bus Lost Communication (RH); DTC B1643: Side Satellite Sensor Bus Initialization Error (RH) [02/2019 - 08/2020]: Procedure

WARNING: This page is about a different car, the 2020 Toyota RAV4 and 2019 Toyota RAV4. However, it is still accessible from the selected car via links, so may be relevant.
  1. CHECK CONNECTION OF CONNECTORS 
    1. Turn the ignition switch off.
    2. Disconnect the cable from the negative (-) auxiliary battery terminal, and wait for at least 90 seconds.
    3. Check that the connectors are properly connected to the airbag ECU assembly and No. 2 side airbag sensor 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  2

  2. CHECK CONNECTORS 
    1. Disconnect the connectors from the airbag ECU assembly and No. 2 side airbag sensor assembly RH.
      GTY875811Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *1 No. 2 Side Airbag Sensor Assembly RH
      *2 Airbag ECU Assembly
      *3 Floor Wire
    2. Check that the connectors (on the airbag ECU assembly side and No. 2 side airbag sensor 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 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.
      GTY942134Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *1 No. 2 Side Airbag Sensor Assembly RH
      *2 Airbag ECU Assembly
      *3 Floor Wire
      *4 Service Wire
      *a Front view of wire harness connector
      (to No. 2 Side Airbag Sensor Assembly RH)
      *b Front view of wire harness connector
      (to Airbag ECU Assembly)
    2. Turn the ignition switch to ON.
    3. Measure the voltage according to the value(s) in the table below.

      Standard Voltage

      Tester Connection Switch Condition Specified Condition
      M16-4 (BCR+) - Body ground Ignition switch ON Below 1 V
      M16-3 (BCR-) - Body ground Ignition switch ON Below 1 V
    4. Turn the ignition switch off.
    5. Disconnect the cable from the negative (-) auxiliary battery terminal, and wait for at least 90 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
      M16-4 (BCR+) - M16-3 (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
      M16-4 (BCR+) - M16-3 (BCR-) Always 1 MΩ or higher
      M16-4 (BCR+) - Body ground Always 1 MΩ or higher
      M16-3 (BCR-) - 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 RH 
    1. Connect the connector to the airbag ECU assembly.
      GTY843404Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *1 No. 2 Side Airbag Sensor Assembly LH
      *2 Airbag ECU Assembly
    2. Interchange the No. 2 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 ignition switch to ON, and wait for at least 60 seconds.
    5. Clear the DTCs stored in memory.

      Refer to DTC CHECK / CLEAR [11/2018 - 08/2020]

      Body Electrical > SRS Airbag > Clear DTCs 

    6. Turn the ignition switch off.
    7. Turn the ignition switch to ON, and wait for at least 60 seconds.
    8. Check for DTCs.

      Refer to DTC CHECK / CLEAR [11/2018 - 08/2020]

      Body Electrical > SRS Airbag > Trouble Codes 

      Result

      Proceed to
      DTC B1642 or B1643 is output
      DTC B1647 or B1648 is output
      DTCs 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 ignition switch off.
    10. Disconnect the cable from the negative (-) auxiliary battery terminal, and wait for at least 90 seconds.
    11. Return the No. 2 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 NO. 2 SIDE AIRBAG SENSOR ASSEMBLY RH. Refer to  REMOVAL [02/2019 - 10/2019]  , or refer to  REMOVAL [10/2019 - 08/2020] 

    Result: 

    DTCs B1642, B1643, B1647 and B1648 are not output 

    USE SIMULATION METHOD TO CHECK. Refer to  HOW TO PROCEED WITH TROUBLESHOOTING [11/2018 - ] 

    Result: 

    DTC B1642 or B1643 is output 

    See step  5

  5. CHECK CONNECTION OF CONNECTOR 
    1. Check that the connector is properly connected to the side airbag pressure 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  6

  6. CHECK CONNECTOR 
    1. Disconnect the connectors from the No. 2 side airbag sensor assembly RH and side airbag pressure sensor RH.
      GTY911931Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *1 Side Airbag Pressure Sensor RH
      *2 No. 2 Side Airbag Sensor Assembly RH
      *3 Front Door Wire RH
      *4 Floor Wire
    2. Check that the connector (on the side airbag pressure sensor RH side) is not damaged.

      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  7

  7. CHECK SIDE AIRBAG PRESSURE SENSOR RH CIRCUIT 
    1. Connect the cable to the negative (-) auxiliary battery terminal, and wait for at least 2 seconds.
      GTY869832Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *1 Side Airbag Pressure Sensor RH
      *2 No. 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 Side Airbag Pressure Sensor RH)
      *b Front view of wire harness connector
      (to No. 2 Side Airbag Sensor Assembly RH)
    2. Turn the ignition switch to ON.
    3. Measure the voltage according to the value(s) in the table below.

      Standard Voltage

      Tester Connection Switch Condition Specified Condition
      I10-2 (BDR+) - Body ground Ignition switch ON Below 1 V
      I10-1 (BDR-) - Body ground Ignition switch ON Below 1 V
    4. Turn the ignition switch off.
    5. Disconnect the cable from the negative (-) auxiliary battery terminal, and wait for at least 90 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
      I10-2 (BDR+) - I10-1 (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
      I10-2 (BDR+) - I10-1 (BDR-) Always 1 MΩ or higher
      I10-2 (BDR+) - Body ground Always 1 MΩ or higher
      I10-1 (BDR-) - Body ground Always 1 MΩ or higher

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    See step  9

    Result: 

    OK 

    See step  8

  8. CHECK SIDE AIRBAG PRESSURE SENSOR RH 
    1. Connect the connector to the No. 2 side airbag sensor assembly RH.
      GTY861952Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *1 Side Airbag Pressure Sensor LH
      *2 No. 2 Side Airbag Sensor Assembly RH
    2. Interchange the side airbag pressure 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 ignition switch to ON, and wait for at least 60 seconds.
    5. Clear the DTCs stored in memory.

      Refer to DTC CHECK / CLEAR [11/2018 - 08/2020]

      Body Electrical > SRS Airbag > Clear DTCs 

    6. Turn the ignition switch off.
    7. Turn the ignition switch to ON, and wait for at least 60 seconds.
    8. Check for DTCs.

      Refer to DTC CHECK / CLEAR [11/2018 - 08/2020]

      Body Electrical > SRS Airbag > Trouble Codes 

      Result

      Proceed to
      DTC B1642 or B1643 is output
      DTC B1647 or B1648 is output
      DTCs 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 ignition switch off.
    10. Disconnect the cable from the negative (-) auxiliary battery terminal, and wait for at least 90 seconds.
    11. Return the side airbag pressure 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 [02/2019 - 10/2019]  , or refer to  REMOVAL [10/2019 - 08/2020] 

    Result: 

    DTC B1647 or B1648 is output 

    REPLACE SIDE AIRBAG PRESSURE SENSOR RH. Refer to  REMOVAL [02/2019 - 10/2019]  , or refer to  REMOVAL [10/2019 - 08/2020] 

    Result: 

    DTCs B1642, B1643, B1647 and B1648 are not output 

    USE SIMULATION METHOD TO CHECK. Refer to  HOW TO PROCEED WITH TROUBLESHOOTING [11/2018 - ] 

  9. CHECK CONNECTORS 
    1. Disconnect the floor wire connector from the front door wire RH.
      GTY937636Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *1 Side Airbag Pressure Sensor RH
      *2 No. 2 Side Airbag Sensor Assembly RH
      *3 Front Door Wire RH
      *4 Floor Wire
    2. Check that the connectors (on the floor wire side and front door wire RH side) are not damaged.

      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 OR FRONT DOOR WIRE RH 

    Result: 

    The connector is not deformed or damaged 

    See step  10

  10. CHECK FLOOR WIRE 
    1. Connect the cable to the negative (-) auxiliary battery terminal, and wait for at least 2 seconds.
      GTY858070Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *1 Side Airbag Pressure Sensor RH
      *2 No. 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 No. 2 Side Airbag Sensor Assembly RH)
    2. Turn the ignition switch to ON.
    3. Measure the voltage according to the value(s) in the table below.

      Standard Voltage

      Tester Connection Switch Condition Specified Condition
      IM2-1 (BDR+) - Body ground Ignition switch ON Below 1 V
      IM2-2 (BDR-) - Body ground Ignition switch ON Below 1 V
    4. Turn the ignition switch off.
    5. Disconnect the cable from the negative (-) auxiliary battery terminal, and wait for at least 90 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
      IM2-1 (BDR+) - IM2-2 (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
      IM2-1 (BDR+) - IM2-2 (BDR-) Always 1 MΩ or higher
      IM2-1 (BDR+) - Body ground Always 1 MΩ or higher
      IM2-2 (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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