AIRBAG SYSTEM, Diagnostic DTC:B1638/82, B1693/81

DTC Code DTC Name
B1638/82 Rear Airbag Sensor Assembly LH Initialization Incomplete
B1693/81 Door Side Airbag Sensor RH Initialization Incomplete

DESCRIPTION

Tech Tips

"Door side airbag sensor RH" refer to the side airbag sensor RH.


DTC Code DTC Detection Condition Trouble Area
B1638/82

When one of the following conditions is met:


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

  • A rear airbag sensor LH malfunction.

  • A side airbag sensor LH malfunction.

  • A center airbag sensor malfunction.

  • Floor wire

  • Rear airbag sensor LH

  • Side airbag sensor LH

  • Center airbag sensor assembly
B1693/81

When one of the following conditions is met:


  • The center airbag sensor receives a line short circuit signal, an open circuit signal, a short circuit to ground signal or a short circuit to B+ signal in the circuit for the side collision sensor RH (to determine deployment of the front seat airbag RH and curtain shield airbag RH) for 2 seconds.

  • A side airbag sensor RH malfunction.

  • A rear airbag sensor RH malfunction.

  • A center airbag sensor malfunction.

  • Floor wire

  • Front door wire RH

  • Side airbag sensor RH

  • Rear airbag sensor RH

  • Center airbag sensor assembly

WIRING DIAGRAM

B001YWRE02
for RH Side
*a Side Airbag Sensor RH
*b Rear Airbag Sensor RH
*c Center Airbag Sensor
B001XAOE34
for LH Side
*a Rear Airbag Sensor LH
*b Side Airbag Sensor LH
*c Center Airbag Sensor

CAUTION / NOTICE / HINT

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, some systems need to be initialized after the cable is reconnected Click here.

  • After replacing the center 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.

      Result
      Result Proceed to
      DTC B1637 or B1692 is output A
      DTC B1632 or B1697 is output B
      DTC B1632, B1637, B1692 and B1697 are not output C

    A

    GO TO DTC B1637 Click here

    B

    GO TO DTC B1632 Click here

    C

  2. 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 B1638 and B1693 are not output A
      DTC B1638 is output B
      DTC B1693 is output C

      Tech Tips

      Codes other than DTC B1638 and B1693 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

  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 center airbag sensor and side airbag sensor RH.

      OK
      The connectors are properly connected.

    NG

    CONNECT CONNECTORS PROPERLY

    OK

  4. CHECK CONNECTORS


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

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

      OK
      The connectors are not deformed or damaged.

    NG

    REPLACE HARNESS AND CONNECTOR

    OK

  5. CHECK SIDE AIRBAG SENSOR RH CIRCUIT


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

      B001WXSE01

    2. Measure the voltage according to the value(s) in the table below.

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      I9-4 (BBR+) - Body ground Ignition switch ON Below 1 V
      I9-3 (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
      I9-4 (BBR+) - I9-3 (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
      I9-4 (BBR+) - I9-3 (BBR-) Always 1 MΩ or higher
      I9-4 (BBR+) - Body ground Always 1 MΩ or higher
      I9-3 (BBR-) - Body ground Always 1 MΩ or higher

    NG

    CHECK NO. 2 FLOOR WIRE (CENTER AIRBAG SENSOR - FRONT DOOR WIRE RH) Click here

    OK

  6. CHECK CONNECTION OF CONNECTORS


    1. Check that the connector is properly connected to the rear airbag sensor RH.

      OK
      The connector is properly connected.

    NG

    CONNECT CONNECTOR PROPERLY

    OK

  7. CHECK CONNECTORS


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

    2. Check that the connector (on the rear airbag sensor RH side) is not damaged.

      OK
      The connector is not deformed or damaged.

    NG

    REPLACE HARNESS AND CONNECTOR

    OK

  8. CHECK REAR AIRBAG SENSOR RH CIRCUIT


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

      B001ZSPE01

    2. Measure the voltage according to the value(s) in the table below.

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      I9-1 (BCR+) - Body ground Ignition switch ON Below 1 V
      I9-2 (BCR-) - 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 2 (BCR+) and 1 (BCR-) of connector E.

      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
      I9-1 (BCR+) - I9-2 (BCR-) Always Below 1 Ω

    7. Disconnect the service wire from connector E.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      I9-1 (BCR+) - I9-2 (BCR-) Always 1 MΩ or higher
      I9-1 (BCR+) - Body ground Always 1 MΩ or higher
      I9-2 (BCR-) - Body ground Always 1 MΩ or higher

    NG

    CHECK FRONT DOOR WIRE RH (SIDE AIRBAG SENSOR RH - NO. 2 FLOOR WIRE) Click here

    OK

  9. CHECK SIDE AIRBAG SENSOR RH


    1. B002033E11
      *1 Center Airbag Sensor
      *2 Side Airbag Sensor LH

      Connect the connector to the center airbag sensor.

    2. Interchange the side 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 the memory Click here.

    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.

      Result
      Result Proceed to
      DTC B1693 and B1698 are not output A
      DTC B1698 is output B
      DTC B1693 is output C

      Tech Tips

      Codes other than DTC B1693 and B1698 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 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 RH Click here

    C

  10. CHECK REAR AIRBAG SENSOR RH


    1. B001ZBHE01
      *1 Rear Airbag Sensor RH
      *2 Side Airbag Sensor RH

      Temporarily replace the rear airbag sensor RH with a new one.

    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 the memory Click here.

    5. Turn the ignition switch off.

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

    7. Check for DTCs Click here.

      OK
      DTC B1693 is not output.

      Tech Tips

      Codes other than DTC B1693 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.


    OK

    REPLACE REAR AIRBAG SENSOR RH Click here

    NG

    REPLACE CENTER AIRBAG SENSOR ASSEMBLY Click here

  11. CHECK NO. 2 FLOOR WIRE (CENTER AIRBAG SENSOR - FRONT DOOR WIRE RH)


    1. Disconnect the No. 2 floor wire from the front door wire RH.

      B001ZMFE02

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

    3. Measure the voltage according to the value(s) in the table below.

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      IL1-4 (BBR+) - Body ground Ignition switch ON Below 1 V
      IL1-3 (BBR-) - 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 (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.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      IL1-4 (BBR+) - IL1-3 (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
      IL1-4 (BBR+) - IL1-3 (BBR-) Always 1 MΩ or higher
      IL1-4 (BBR+) - Body ground Always 1 MΩ or higher
      IL1-3 (BBR-) - Body ground Always 1 MΩ or higher

    OK

    REPLACE FRONT DOOR WIRE RH

    NG

    REPLACE NO. 2 FLOOR WIRE

  12. CHECK FRONT DOOR WIRE RH (SIDE AIRBAG SENSOR RH - NO. 2 FLOOR WIRE)


    1. Disconnect the front door wire RH from the No. 2 floor wire.

      B001Z7KE02

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

    3. Measure the voltage according to the value(s) in the table below.

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      I9-1 (BCR+) - Body ground Ignition switch ON Below 1 V
      I9-2 (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 2 (BCR+) and 1 (BCR-) of connector C.

      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
      I9-1 (BCR+) - I9-2 (BCR-) Always Below 1 Ω

    8. Disconnect the service wire from connector C.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      I9-1 (BCR+) - I9-2 (BCR-) Always 1 MΩ or higher
      I9-1 (BCR+) - Body ground Always 1 MΩ or higher
      I9-2 (BCR-) - Body ground Always 1 MΩ or higher

    OK

    REPLACE NO. 2 FLOOR WIRE

    NG

    REPLACE FRONT DOOR WIRE RH

  13. 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

  14. 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.

    NG

    REPLACE FLOOR WIRE

    OK

  15. CHECK 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.

      B00205FE01

    2. Measure the voltage according to the value(s) in the table below.

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      K7-4 (BBL+) - Body ground Ignition switch ON Below 1 V
      K7-3 (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
      K7-4 (BBL+) - K7-3 (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
      K7-4 (BBL+) - K7-3 (BBL-) Always 1 MΩ or higher
      K7-4 (BBL+) - Body ground Always 1 MΩ or higher
      K7-3 (BBL-) - Body ground Always 1 MΩ or higher

    NG

    REPLACE FLOOR WIRE

    OK

  16. CHECK CONNECTION OF CONNECTOR


    1. Check that the connector is properly connected to the side airbag sensor LH.

      OK
      The connector is properly connected.

    NG

    CONNECT CONNECTORS PROPERLY

    OK

  17. CHECK CONNECTORS


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

    2. Check that the connector (on the side airbag sensor LH side) is not damaged.

      OK
      The connector is not deformed or damaged.

    NG

    REPLACE HARNESS AND CONNECTOR

    OK

  18. CHECK SIDE AIRBAG SENSOR LH CIRCUIT


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

      B001Y2SE01

    2. Measure the voltage according to the value(s) in the table below.

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      K7-1 (BCL+) - Body ground Ignition switch ON Below 1 V
      K7-2 (BCL-) - 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 2 (BCL+) and 1 (BCL-) of connector E.

      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
      K7-1 (BCL+) - K7-2 (BCL-) Always Below 1 Ω

    7. Disconnect the service wire from connector E.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      K7-1 (BCL+) - K7-2 (BCL-) Always 1 MΩ or higher
      K7-1 (BCL+) - Body ground Always 1 MΩ or higher
      K7-2 (BCL-) - Body ground Always 1 MΩ or higher

    NG

    CHECK FLOOR WIRE (REAR AIRBAG SENSOR LH - FRONT DOOR WIRE LH) Click here

    OK

  19. CHECK REAR AIRBAG SENSOR LH


    1. B001ZSWE19
      *1 Center Airbag Sensor
      *2 Rear Airbag Sensor LH

      Temporarily replace the side airbag sensor LH with a new one.

    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 the memory Click here.

    5. Turn the ignition switch off.

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

    7. Check for DTCs Click here.

      OK
      DTC B1638 is not output.

      Tech Tips

      Codes other than DTC 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.


    OK

    REPLACE REAR AIRBAG SENSOR LH Click here

    NG

  20. CHECK SIDE AIRBAG SENSOR LH


    1. B001ZBHE12
      *1 Side Airbag Sensor RH
      *2 Rear Airbag Sensor LH

      Interchange the side airbag sensor LH with LRH 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 the 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 B1638 is output A
      DTC B1633 is output B
      DTC B1633 and B1638 are not 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.


    C

    USE SIMULATION METHOD TO CHECK Click here

    A

    REPLACE CENTER AIRBAG SENSOR ASSEMBLY Click here

    B

    REPLACE SIDE AIRBAG SENSOR LH Click here

  21. CHECK FLOOR WIRE (REAR AIRBAG SENSOR LH - FRONT DOOR WIRE LH)


    1. Disconnect the floor wire from the front door wire LH.

      B001ZO5E02

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

    3. Measure the voltage according to the value(s) in the table below.

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      K7-1 (BCL+) - Body ground Ignition switch ON Below 1 V
      K7-2 (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 2 (BCL+) and 1 (BCL-) of connector C.

      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
      K7-1 (BCL+) - K7-2 (BCL-) Always Below 1 Ω

    8. Disconnect the service wire from connector C.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      K7-1 (BCL+) - K7-2 (BCL-) Always 1 MΩ or higher
      K7-1 (BCL+) - Body ground Always 1 MΩ or higher
      K7-2 (BCL-) - Body ground Always 1 MΩ or higher

    OK

    REPLACE FRONT DOOR WIRE LH

    NG

    REPLACE FLOOR WIRE