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Home >> Toyota >> 2021 >> 4Runner Limited, RWD >> Repair and Diagnosis >> Restraints >> Air Bag, SRS >> Airbag System - Diagnostic Codes (B100-B1690) >> Airbag System >> DTC B1633-81: Rear Airbag Sensor Assembly RH Initialization Incomplete; DTC B1638-82: Rear Airbag Sensor Assembly LH Initialization Incomplete [08/2015 - 08/2019] >> Procedure

DTC B1633-81: Rear Airbag Sensor Assembly RH Initialization Incomplete; DTC B1638-82: Rear Airbag Sensor Assembly LH Initialization Incomplete [08/2015 - 08/2019]: Procedure

  1. CHECK FOR DTC 
    1. Turn the ignition switch off.

      HINT: 

      If a communication error occurs, DTCs for both the LH and RH sides will be stored simultaneously. The malfunctioning area can be identified by turning the ignition switch off and then to ON again.

    2. Turn the ignition switch to ON, and wait for at least 60 seconds.
    3. Check for DTCs (Refer to DTC CHECK / CLEAR [08/2015 - 08/2019] ).
      RESULT

      Result Proceed to
      DTC B1633 and B1638 are not output A
      DTC B1638 is output B
      DTC B1633 is output C

      HINT: 

      Codes other than DTC B1633 and B1638 may be output at this time, but they are not related to this check.

    Result: 

    A 

    USE SIMULATION METHOD TO CHECK 

    (Refer to DIAGNOSIS SYSTEM [08/2015 - 08/2019] )

    Result: 

    B 

    See step  7

    Result: 

    C 

    See step  2

  2. CHECK CONNECTION OF CONNECTORS 
    1. Turn the ignition switch off.
    2. Disconnect the cable from the negative (-) battery terminal, and wait for at least 90 seconds.
    3. Check that the connectors are properly connected to the center airbag sensor and rear airbag sensor RH.

      OK

      The connectors are properly connected.

    Result: 

    NG 

    CONNECT CONNECTORS PROPERLY 

    Result: 

    OK 

    See step  3

  3. CHECK CONNECTORS 
    1. Disconnect the connectors from the center airbag sensor and rear airbag sensor RH.
    2. Check that the connectors (on the center airbag sensor side and rear airbag sensor RH side) are not damaged.

      OK

      The connectors are not deformed or damaged.

      GTY377779Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      TEXT IN ILLUSTRATION

      *1 Rear Airbag Sensor RH
      *2 Center Airbag Sensor

    Result: 

    NG 

    REPLACE FLOOR WIRE 

    Result: 

    OK 

    See step  4

  4. CHECK FLOOR WIRE (CENTER AIRBAG SENSOR - REAR AIRBAG SENSOR RH) 
    1. Connect the cable to the negative (-) battery terminal, and wait for at least 2 seconds.
      GTY703388Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      TEXT IN ILLUSTRATION

      *1 Rear Airbag Sensor RH *2 Center Airbag Sensor
      *3 Floor Wire *4 Connector C
      *5 Connector B *6 Service Wire
      *a Rear view of wire harness connector
      (to Rear Airbag Sensor RH)      		 *b Rear view of wire harness connector
      (to Center Airbag Sensor)
    2. Measure the voltage according to the value(s) in the table below.

      Standard Voltage

      Tester Connection Switch Condition Specified Condition
      N9-4 (BBR+) - Body ground Ignition switch ON Below 1 V
      N9-3 (BBR-) - Body ground Ignition switch ON Below 1 V
    3. Turn the ignition switch off.
    4. Disconnect the cable from the negative (-) battery terminal, and wait for at least 90 seconds.
    5. Using a service wire, connect terminals 17 (BBR+) and 18 (BBR-) of connector B.
      NOTE:

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

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

      Standard Resistance

      Tester Connection Condition Specified Condition
      N9-4 (BBR+) - N9-3 (BBR-) Always Below 1 Ω
    7. Disconnect the service wire from connector B.
    8. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      N9-4 (BBR+) - N9-3 (BBR-) Always 1 MΩ or higher
      N9-4 (BBR+) - Body ground Always 1 MΩ or higher
      N9-3 (BBR-) - Body ground Always 1 MΩ or higher

    Result: 

    NG 

    REPLACE FLOOR WIRE 

    Result: 

    OK 

    See step  5

  5. CHECK REAR AIRBAG SENSOR RH 
    1. Connect the connector to the center airbag sensor.
      GTY538320Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Interchange the rear airbag sensor LH with RH and connect the connectors to them.
    3. Connect the cable to the negative (-) 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 [08/2015 - 08/2019] ).
    6. Turn the ignition switch off.
    7. Turn the ignition switch to ON, and wait for at least 90 seconds.
    8. Check for DTCs (Refer to DTC CHECK / CLEAR [08/2015 - 08/2019] ).
      RESULT

      Result Proceed to
      DTC B1633 and B1638 are not output A
      DTC B1638 is output B
      DTC B1633 is output C

      HINT: 

      Codes other than DTC B1633 and B1638 may be output at this time, but they are not related to this check.

      TEXT IN ILLUSTRATION

      *1 Rear Airbag Sensor LH
      *2 Center Airbag Sensor
    9. Turn the ignition switch off.
    10. Disconnect the cable from the negative (-) battery terminal, and wait for at least 90 seconds.
    11. Return the rear airbag sensor LH and RH to their original positions and connect the connectors to them.

    Result: 

    A 

    USE SIMULATION METHOD TO CHECK 

    (Refer to DIAGNOSIS SYSTEM [08/2015 - 08/2019] )

    Result: 

    B 

    REPLACE REAR AIRBAG SENSOR RH 

    (Refer to REMOVAL [08/2015 - ] )

    Result: 

    C 

    See step  6

  6. CHECK SIDE AIRBAG SENSOR RH 
    1. Interchange the side airbag sensor LH with RH and connect the connectors to them.
      GTY529612Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Connect the cable to the negative (-) battery terminal, and wait for at least 2 seconds.
    3. Turn the ignition switch to ON, and wait for at least 60 seconds.
    4. Clear the DTCs stored in memory (Refer to DTC CHECK / CLEAR [08/2015 - 08/2019] ).
    5. Turn the ignition switch off.
    6. Turn the ignition switch to ON, and wait for at least 90 seconds.
    7. Check for DTCs (Refer to DTC CHECK / CLEAR [08/2015 - 08/2019] ).
      RESULT

      Result Proceed to
      DTC B1633 and B1638 are not output A
      DTC B1638 is output B
      DTC B1633 is output C

      HINT: 

      Codes other than DTC B1633 and B1638 may be output at this time, but they are not related to this check.

      TEXT IN ILLUSTRATION

      *1 Side Airbag Sensor LH
      *2 Rear Airbag Sensor RH
    8. Turn the ignition switch off.
    9. Disconnect the cable from the negative (-) battery terminal, and wait for at least 90 seconds.
    10. Return the side airbag sensor LH and RH to their original positions and connect the connectors to them.

    Result: 

    C 

    REPLACE CENTER AIRBAG SENSOR ASSEMBLY 

    (Refer to REMOVAL [08/2015 - ] )

    Result: 

    A 

    USE SIMULATION METHOD TO CHECK 

    (Refer to DIAGNOSIS SYSTEM [08/2015 - 08/2019] )

    Result: 

    B 

    REPLACE SIDE AIRBAG SENSOR ASSEMBLY RH 

    (Refer to REMOVAL [08/2015 - ] )

  7. CHECK CONNECTION OF CONNECTORS 
    1. Turn the ignition switch off.
    2. Disconnect the cable from the negative (-) battery terminal, and wait for at least 90 seconds.
    3. Check that the connectors are properly connected to the center airbag sensor and rear airbag sensor LH.

      OK

      The connectors are properly connected.

    Result: 

    NG 

    CONNECT CONNECTORS PROPERLY 

    Result: 

    OK 

    See step  8

  8. CHECK CONNECTORS 
    1. Disconnect the connectors from the center airbag sensor and rear airbag sensor LH.
    2. Check that the connectors (on the center airbag sensor side and rear airbag sensor LH side) are not damaged.

      OK

      The connectors are not deformed or damaged.

      GTY313087Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      TEXT IN ILLUSTRATION

      *1 Rear Airbag Sensor LH
      *2 Center Airbag Sensor

    Result: 

    NG 

    REPLACE NO. 2 FLOOR WIRE 

    Result: 

    OK 

    See step  9

  9. CHECK NO. 2 FLOOR WIRE (CENTER AIRBAG SENSOR - REAR AIRBAG SENSOR LH) 
    1. Connect the cable to the negative (-) battery terminal, and wait for at least 2 seconds.
      GTY703826Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      TEXT IN ILLUSTRATION

      *1 Rear Airbag Sensor LH *2 Center Airbag Sensor
      *3 No. 2 Floor Wire *4 Connector C
      *5 Connector B *6 Service Wire
      *a Rear view of wire harness connector
      (to Rear Airbag Sensor LH)      		 *b Rear view of wire harness connector
      (to Center Airbag Sensor)
    2. Measure the voltage according to the value(s) in the table below.

      Standard Voltage

      Tester Connection Switch Condition Specified Condition
      O8-4 (BBL+) - Body ground Ignition switch ON Below 1 V
      O8-3 (BBL-) - Body ground Ignition switch ON Below 1 V
    3. Turn the ignition switch off.
    4. Disconnect the cable from the negative (-) battery terminal, and wait for at least 90 seconds.
    5. Using a service wire, connect terminals 24 (BBL+) and 23 (BBL-) of connector B.
      NOTE:

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

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

      Standard Resistance

      Tester Connection Condition Specified Condition
      O8-4 (BBL+) - O8-3 (BBL-) Always Below 1 Ω
    7. Disconnect the service wire from connector B.
    8. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      O8-4 (BBL+) - O8-3 (BBL-) Always 1 MΩ or higher
      O8-4 (BBL+) - Body ground Always 1 MΩ or higher
      O8-3 (BBL-) - Body ground Always 1 MΩ or higher

    Result: 

    NG 

    REPLACE NO. 2 FLOOR WIRE 

    Result: 

    OK 

    See step  10

  10. CHECK REAR AIRBAG SENSOR LH 
    1. Connect the connector to the center airbag sensor.
      GTY312150Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Interchange the rear airbag sensor LH with RH and connect the connectors to them.
    3. Connect the cable to the negative (-) 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 [08/2015 - 08/2019] ).
    6. Turn the ignition switch off.
    7. Turn the ignition switch to ON, and wait for at least 90 seconds.
    8. Check for DTCs (Refer to DTC CHECK / CLEAR [08/2015 - 08/2019] ).
      RESULT

      Result Proceed to
      DTC B1633 and B1638 are not output A
      DTC B1633 is output B
      DTC B1638 is output C

      HINT: 

      Codes other than DTC B1633 and B1638 may be output at this time, but they are not related to this check.

      TEXT IN ILLUSTRATION

      *1 Rear Airbag Sensor RH
      *2 Center Airbag Sensor
    9. Turn the ignition switch off.
    10. Disconnect the cable from the negative (-) battery terminal, and wait for at least 90 seconds.
    11. Return the rear airbag sensor RH and LH to their original positions and connect the connectors to them.

    Result: 

    A 

    USE SIMULATION METHOD TO CHECK 

    (Refer to DIAGNOSIS SYSTEM [08/2015 - 08/2019] )

    Result: 

    B 

    REPLACE REAR AIRBAG SENSOR LH 

    (Refer to REMOVAL [08/2015 - ] )

    Result: 

    C 

    See step  11

  11. CHECK SIDE AIRBAG SENSOR LH 
    1. Interchange the side airbag sensor LH with RH and connect the connectors to them.
      GTY529612Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Connect the cable to the negative (-) battery terminal, and wait for at least 2 seconds.
    3. Turn the ignition switch to ON, and wait for at least 60 seconds.
    4. Clear the DTCs stored in memory (Refer to DTC CHECK / CLEAR [08/2015 - 08/2019] ).
    5. Turn the ignition switch off.
    6. Turn the ignition switch to ON, and wait for at least 90 seconds.
    7. Check for DTCs (Refer to DTC CHECK / CLEAR [08/2015 - 08/2019] ).
      RESULT

      Result Proceed to
      DTC B1633 and B1638 are not output A
      DTC B1633 is output B
      DTC B1638 is output C

      HINT: 

      Codes other than DTC B1633 and B1638 may be output at this time, but they are not related to this check.

      TEXT IN ILLUSTRATION

      *1 Side Airbag Sensor RH
      *2 Rear Airbag Sensor LH
    8. Turn the ignition switch off.
    9. Disconnect the cable from the negative (-) battery terminal, and wait for at least 90 seconds.
    10. Return the side airbag sensor RH and LH to their original positions and connect the connectors to them.

    Result: 

    C 

    REPLACE CENTER AIRBAG SENSOR ASSEMBLY 

    (Refer to REMOVAL [08/2015 - ] )

    Result: 

    A 

    USE SIMULATION METHOD TO CHECK 

    (Refer to DIAGNOSIS SYSTEM [08/2015 - 08/2019] )

    Result: 

    B 

    REPLACE SIDE AIRBAG SENSOR ASSEMBLY LH 

    (Refer to REMOVAL [08/2015 - ] )

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