AIRBAG SYSTEM(w/ Occupant Classification System), Diagnostic DTC:B1633/81, B1638/82

DTC Code DTC Name
B1633/81 Rear Airbag Sensor Assembly RH Initialization Incomplete
B1638/82 Rear Airbag Sensor Assembly LH Initialization Incomplete

DESCRIPTION

The circuit for the side collision sensor LH or RH (to determine deployment of the curtain shield airbag assembly LH or RH) is composed of the airbag sensor assembly, door side airbag sensor LH or RH and rear airbag sensor LH or RH.

The rear airbag sensor LH or RH detect impacts to the vehicle and send signals to the airbag sensor assembly to determine if the airbag should be deployed.

DTC B1633/81 or B1638/82 is stored when a malfunction is detected in the circuit for the rear side collision sensor LH or RH (to determine deployment of the curtain shield airbag assembly LH or RH).

DTC No. Detection Item DTC Detection Condition Trouble Area
B1633/81 Rear Airbag Sensor Assembly RH Initialization Incomplete

One of the following conditions is met:


  • The airbag sensor assembly detects a line short circuit signal, open circuit signal, short circuit to ground signal or short circuit to B+ signal in the circuit for the rear side collision sensor RH (to determine deployment of the curtain shield airbag assembly RH) for 2 seconds.

  • A rear airbag sensor RH malfunction.

  • An airbag sensor assembly malfunction.

  • Floor wire

  • Rear airbag sensor RH

  • Airbag sensor assembly
B1638/82 Rear Airbag Sensor Assembly LH Initialization Incomplete

One of the following conditions is met:


  • The airbag sensor assembly detects a line short circuit signal, open circuit signal, short circuit to ground signal or short circuit to B+ signal in the circuit for the rear side collision sensor LH (to determine deployment of the curtain shield airbag assembly LH) for 2 seconds.

  • A rear airbag sensor LH malfunction.

  • An airbag sensor assembly malfunction.

  • No. 2 floor wire

  • Rear airbag sensor LH

  • Airbag sensor assembly

WIRING DIAGRAM

A01V8TXE03
for RH Side
*a Airbag Sensor Assembly
*b Rear Airbag Sensor RH
*c Door Side Airbag Sensor RH
A01V8TXE04
for LH Side
*a Airbag Sensor Assembly
*b Rear Airbag Sensor LH
*c Door Side Airbag Sensor LH

CAUTION / NOTICE / HINT

Note


  • After turning the ignition switch off, waiting time may be required before disconnecting the cable from the negative (-) battery terminal. Therefore, make sure to read the disconnecting the cable from the negative (-) battery terminal notices before proceeding with work.

    Click here

  • When disconnecting the cable from the negative (-) battery terminal while performing repairs, some systems need to be initialized after the cable is reconnected.

    Click here

  • After replacing the airbag sensor assembly, refer to initialization.

    Click here

PROCEDURE


  1. CHECK PAST DTC


    1. Turn the ignition switch to ON, and wait for at least 60 seconds.

    2. Check for DTCs.

      Click here


      Body Electrical > SRS Airbag > Trouble Codes
      Result
      Proceed to
      DTC B1632/81 and B1637/82 are not output
      DTC B1632/81 and B1637/82 are output

    DTC B1632/81 and B1637/82 are output

    GO TO DTC B1632/81 Click here

    DTC B1632/81 and B1637/82 are not output

  2. CHECK DTC


    1. Turn the ignition switch to ON.

      Tech Tips

      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.

      Click here


      Body Electrical > SRS Airbag > Trouble Codes
      Result
      Proceed to
      DTC B1633/81 is output
      DTC B1638/82 is output
      DTC B1633/81 and B1638/82 are not output

      Tech Tips

      Codes other than DTC B1633/81 and B1638/82 may be output at this time, but they are not related to this check.


    DTC B1638/82 is output

    CHECK CONNECTION OF CONNECTORS Click here

    DTC B1633/81 and B1638/82 are not output

    USE SIMULATION METHOD TO CHECK Click here

    DTC B1633/81 is output

  3. 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 airbag sensor assembly and rear airbag sensor RH.

      Result
      Proceed to
      The connectors are properly connected
      The connectors are not properly connected

    The connectors are not properly connected

    CONNECT CONNECTORS PROPERLY

    The connectors are properly connected

  4. CHECK CONNECTORS


    1. Disconnect the connectors from the airbag sensor assembly and rear airbag sensor RH.

    2. A01V7VLC09
      *1 Rear Airbag Sensor RH
      *2 Airbag Sensor Assembly
      *3 Floor Wire

      Check that the connectors (on the airbag sensor assembly side and rear airbag sensor RH side) are not damaged.

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

    The connectors are deformed or damaged

    REPLACE FLOOR WIRE

    The connectors are not deformed or damaged

  5. CHECK REAR AIRBAG SENSOR RH CIRCUIT


    1. Connect the cable to the negative (-) battery terminal, and wait for at least 2 seconds.

      A01V7BAC04
      *1 Rear Airbag Sensor RH *2 Airbag Sensor Assembly
      *3 No. 2 Floor Wire *4 Connector C
      *5 Connector B *6 Service Wire
      *a

      Front view of wire harness connector

      (to Rear Airbag Sensor LH)

      		 *b

      Rear view of wire harness connector

      (to Airbag Sensor 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
      M7-4 (BCR+) - Body ground Ignition switch ON Below 1 V
      M7-3 (BCR-) - Body ground Ignition switch ON Below 1 V

    4. Turn the ignition switch off.

    5. Disconnect the cable from the negative (-) battery terminal, and wait for at least 90 seconds.

    6. Using a service wire, connect terminals 24 (BBR+) and 23 (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
      M7-4 (BCR+) - M7-3 (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
      M7-4 (BCR+) - M7-3 (BCR-) Always 1 MΩ or higher
      M7-4 (BCR+) - Body ground Always 1 MΩ or higher
      M7-3 (BCR-) - Body ground Always 1 MΩ or higher
      Result
      Proceed to
      OK
      NG

    NG

    REPLACE FLOOR WIRE

    OK

  6. CHECK REAR AIRBAG SENSOR RH


    1. A01VAFHC16
      *1 Rear Airbag Sensor LH
      *2 Airbag Sensor Assembly

      Connect the connector to the airbag sensor assembly.

    2. Interchange the rear airbag sensor RH with LH 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.

      Click here


      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.

      Click here


      Body Electrical > SRS Airbag > Trouble Codes
      Result
      Proceed to
      DTC B1638/82 is output
      DTC B1633/81 is output
      DTC B1633/81 and B1638/82 are not output

      Tech Tips

      Codes other than DTC B1633/81 and B1638/82 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 (-) 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.


    DTC B1638/82 is output

    REPLACE REAR AIRBAG SENSOR RH Click here

    DTC B1633/81 is output

    REPLACE AIRBAG SENSOR ASSEMBLY Click here

    DTC B1633/81 and B1638/82 are not output

    USE SIMULATION METHOD TO CHECK Click here

  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 airbag sensor assembly and rear airbag sensor LH.

      Result
      Proceed to
      The connectors are properly connected
      The connectors are not properly connected

    The connectors are not properly connected

    CONNECT CONNECTORS PROPERLY

    The connectors are properly connected

  8. CHECK CONNECTORS


    1. Disconnect the connectors from the airbag sensor assembly and rear airbag sensor LH.

    2. A01V8UQC06
      *1 Rear Airbag Sensor LH
      *2 Airbag Sensor Assembly
      *3 No. 2 Floor Wire

      Check that the connectors (on the airbag sensor assembly side and rear airbag sensor LH side) are not damaged.

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

    The connectors are deformed or damaged

    REPLACE NO. 2 FLOOR WIRE

    The connectors are not deformed or damaged

  9. CHECK REAR AIRBAG SENSOR LH CIRCUIT


    1. Connect the cable to the negative (-) battery terminal, and wait for at least 2 seconds.

      A01V7L8C02
      *1 Rear Airbag Sensor LH *2 Airbag Sensor Assembly
      *3 No. 2 Floor Wire *4 Connector C
      *5 Connector B *6 Service Wire
      *a

      Front view of wire harness connector

      (to Rear Airbag Sensor LH)

      		 *b

      Rear view of wire harness connector

      (to Airbag Sensor 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
      N9-4 (BCL+) - Body ground Ignition switch ON Below 1 V
      N9-3 (BCL-) - Body ground Ignition switch ON Below 1 V

    4. Turn the ignition switch off.

    5. Disconnect the cable from the negative (-) battery terminal, and wait for at least 90 seconds.

    6. Using a service wire, connect terminals 17 (BBL+) and 18 (BBL-) 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
      N9-4 (BCL+) - N9-3 (BCL-) 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
      N9-4 (BCL+) - N9-3 (BCL-) Always 1 MΩ or higher
      N9-4 (BCL+) - Body ground Always 1 MΩ or higher
      N9-3 (BCL-) - Body ground Always 1 MΩ or higher
      Result
      Proceed to
      OK
      NG

    NG

    REPLACE NO. 2 FLOOR WIRE

    OK

  10. CHECK REAR AIRBAG SENSOR LH


    1. A01V8MWC15
      *1 Rear Airbag Sensor RH
      *2 Airbag Sensor Assembly

      Connect the connector to the airbag sensor assembly.

    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.

      Click here


      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.

      Click here


      Body Electrical > SRS Airbag > Trouble Codes
      Result
      Proceed to
      DTC B1633/81 is output
      DTC B1638/82 is output
      DTC B1633/81 and B1638/82 are not output

      Tech Tips

      Codes other than DTC B1633/81 and B1638/82 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 (-) 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.


    DTC B1633/81 is output

    REPLACE REAR AIRBAG SENSOR LH Click here

    DTC B1638/82 is output

    REPLACE AIRBAG SENSOR ASSEMBLY Click here

    DTC B1633/81 and B1638/82 are not output

    USE SIMULATION METHOD TO CHECK Click here