AIRBAG 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 front seat side airbag LH or RH and curtain shield airbag LH or RH) is composed of the center airbag sensor, 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 center airbag sensor to determine if the airbag should be deployed.

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

DTC Code DTC Detection Condition Trouble Area
B1633/81

One of the following conditions is met:


  • The center airbag sensor 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 collision sensor RH (to determine deployment of the curtain shield airbag RH) for 2 seconds.

  • A rear airbag sensor RH malfunction.

  • A side airbag sensor RH malfunction.

  • A center airbag sensor malfunction.

  • Floor wire

  • Rear airbag sensor RH

  • Side airbag sensor assembly RH

  • Center airbag sensor assembly
B1638/82

One of the following conditions is met:


  • The center airbag sensor 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 collision sensor LH (to determine deployment of the curtain shield airbag LH) for 2 seconds.

  • A rear airbag sensor LH malfunction.

  • A side airbag sensor LH malfunction.

  • A center airbag sensor malfunction.

  • No. 2 floor wire

  • Rear airbag sensor LH

  • Side airbag sensor assembly LH

  • Center airbag sensor assembly

WIRING DIAGRAM

A00XCECE11
A00XCECE12

INSPECTION PROCEDURE

Note


  • After turning the ignition switch off, waiting time may be required before disconnecting the cable from the battery terminal. Therefore, make sure to read the disconnecting the cable from the battery terminal notice 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.

PROCEDURE


  1. CHECK FOR DTC


    1. Turn the ignition switch off.

      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.

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

      Tech Tips

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


    A

    USE SIMULATION METHOD TO CHECK Click here

    B

    CHECK CONNECTION OF CONNECTORS Click here

    C

  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.

    NG

    CONNECT CONNECTORS PROPERLY

    OK

  3. CHECK CONNECTORS


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

    2. A00XKM5E01
      Text in Illustration
      *1 Rear Airbag Sensor RH
      *2 Center Airbag Sensor

      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.

    NG

    REPLACE FLOOR WIRE

    OK

  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.

      A00XBZHE03
      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
      Q4-4 (BBR+) - Body ground Ignition switch ON Below 1 V
      Q4-3 (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 8 (BBR+) and 11 (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
      Q4-4 (BBR+) - Q4-3 (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
      Q4-4 (BBR+) - Q4-3 (BBR-) Always 1 MΩ or higher
      Q4-4 (BBR+) - Body ground Always 1 MΩ or higher
      Q4-3 (BBR-) - Body ground Always 1 MΩ or higher

    NG

    REPLACE FLOOR WIRE

    OK

  5. CHECK REAR AIRBAG SENSOR RH


    1. A00XF2UE03
      Text in Illustration
      *1 Rear Airbag Sensor LH
      *2 Center Airbag Sensor

      Connect the connector to the center airbag sensor.

    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.

    6. Turn the ignition switch off.

    7. Turn the ignition switch to ON, and wait for at least 90 seconds.

    8. Check for DTCs Click here.

      Result
      Result Proceed to
      DTC B1633 and B1638 are not output A
      DTC B1638 is output (for 3 Door) B
      DTC B1638 is output (for 5 Door) C
      DTC B1633 is output D

      Tech Tips

      Codes other than DTC B1633 and B1638 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.


    A

    USE SIMULATION METHOD TO CHECK Click here

    B

    REPLACE REAR AIRBAG SENSOR RH Click here

    C

    REPLACE REAR AIRBAG SENSOR RH Click here

    D

  6. CHECK SIDE AIRBAG SENSOR RH


    1. A00XBV8E15
      Text in Illustration
      *1 Side Airbag Sensor LH
      *2 Rear Airbag Sensor RH

      Interchange the side airbag sensor LH with RH and connect the connectors to them.

    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 Click here.

    5. Turn the ignition switch off.

    6. Turn the ignition switch to ON, and wait for at least 90 seconds.

    7. Check for DTCs Click here.

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

      Tech Tips

      Codes other than DTC B1643, B1693 and B1698 may be output at this time, but they are not related to this check.

    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.


    A

    USE SIMULATION METHOD TO CHECK Click here

    B

    REPLACE SIDE AIRBAG SENSOR ASSEMBLY RH Click here

    C

    REPLACE CENTER AIRBAG SENSOR ASSEMBLY 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 center airbag sensor and rear airbag sensor LH.

      OK
      The connectors are properly connected.

    NG

    CONNECT CONNECTORS PROPERLY

    OK

  8. CHECK CONNECTORS


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

    2. A00XFDXE01
      Text in Illustration
      *1 Rear Airbag Sensor LH
      *2 Center Airbag Sensor

      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.

    NG

    REPLACE NO. 2 FLOOR WIRE

    OK

  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.

      A00XD67E03
      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
      R4-4 (BBL+) - Body ground Ignition switch ON Below 1 V
      R4-3 (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 8 (BBL+) and 15 (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
      R4-4 (BBL+) - R4-3 (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
      R4-4 (BBL+) - R4-3 (BBL-) Always 1 MΩ or higher
      R4-4 (BBL+) - Body ground Always 1 MΩ or higher
      R4-3 (BBL-) - Body ground Always 1 MΩ or higher

    NG

    REPLACE NO. 2 FLOOR WIRE

    OK

  10. CHECK REAR AIRBAG SENSOR LH


    1. A00XI1DE01
      Text in Illustration
      *1 Rear Airbag Sensor RH
      *2 Center Airbag Sensor

      Connect the connector to the center airbag sensor.

    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.

    6. Turn the ignition switch off.

    7. Turn the ignition switch to ON, and wait for at least 90 seconds.

    8. Check for DTCs Click here.

      Result
      Result Proceed to
      DTC B1633 and B1638 are not output A
      DTC B1633 is output (for 3 Door) B
      DTC B1633 is output (for 5 Door) C
      DTC B1638 is output D

      Tech Tips

      Codes other than DTC B1633 and B1638 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.


    A

    USE SIMULATION METHOD TO CHECK Click here

    B

    REPLACE REAR AIRBAG SENSOR LH Click here

    C

    REPLACE REAR AIRBAG SENSOR LH Click here

    D

  11. CHECK SIDE AIRBAG SENSOR LH


    1. A00XBV8E15
      Text in Illustration
      *1 Side Airbag Sensor RH
      *2 Rear Airbag Sensor LH

      Interchange the side airbag sensor LH with RH and connect the connectors to them.

    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 Click here.

    5. Turn the ignition switch off.

    6. Turn the ignition switch to ON, and wait for at least 90 seconds.

    7. Check for DTCs Click here.

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

      Tech Tips

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

    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.


    A

    USE SIMULATION METHOD TO CHECK Click here

    B

    REPLACE SIDE AIRBAG SENSOR ASSEMBLY LH Click here

    C

    REPLACE CENTER AIRBAG SENSOR ASSEMBLY Click here