AIRBAG SYSTEM, Diagnostic DTC:B1638

DTC Code DTC Name
B1638 Curtain Shield Airbag Sensor Initialization Error (LH)

DESCRIPTION

The side collision sensor LH circuit (bus 1) consists of the airbag sensor assembly, door side airbag sensor LH and side No. 2 airbag sensor LH.

The door side airbag sensor LH and side No. 2 airbag sensor LH detect impacts to the vehicle and send signals to the airbag sensor assembly to determine if the airbags and pretensioners should be deployed.

DTC B1638 is stored when a malfunction is detected in the side collision sensor LH circuit (bus 1).

DTC No. Detection Item DTC Detection Condition Trouble Area Warning Indicate Test Mode / Check Mode
B1638 Curtain Shield Airbag Sensor Initialization Error (LH)

  • The airbag sensor assembly detects a line short, short to ground or B+, or an open in the side collision sensor LH circuit (bus 1).

  • Side No. 2 airbag sensor LH malfunction

  • Airbag sensor assembly malfunction

  • Floor wire

  • Front door wire LH

  • Side No. 2 airbag sensor LH

  • Airbag sensor assembly

 Comes on Does not apply to test/check mode

WIRING DIAGRAM

B0070L2E14

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

PROCEDURE


  1. CHECK HISTORY DTC


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

    2. Check for history DTCs.


      Body Electrical > SRS Airbag > Trouble Codes

      Tech Tips

      Codes other than history DTC B1637 may be output at this time, but they are not related to this check.

      Result
      Result Proceed to
      History DTC B1637 is not output. A
      History DTC B1637 is output. B

    B

    GO TO DTC B1637 Click here

    A

  2. CHECK CONNECTION OF CONNECTORS


    1. Turn the ignition switch off.

    2. Disconnect the cable from the negative (-) battery terminal.

      CAUTION:

      Wait at least 90 seconds after disconnecting the cable from the negative (-) battery terminal to disable the SRS system.

    3. Check that the connectors are properly connected to the airbag sensor assembly, door side airbag sensor LH and side No. 2 airbag sensor LH. Also check that the connectors that link the floor wire and front door wire LH are properly connected.

      OK
      The connectors are properly connected.
      Result
      Proceed to
      OK
      NG

    NG

    CONNECT CONNECTORS PROPERLY

    OK

  3. CHECK CONNECTORS


    1. Disconnect the connectors from the airbag sensor assembly, door side airbag sensor LH and side No. 2 airbag sensor LH. Also disconnect the connectors that link the floor wire and front door wire LH.

    2. Check that the terminals of the connectors are not deformed or damaged.

      OK
      The terminals are not deformed or damaged.
      Result
      Proceed to
      OK
      NG

    NG

    REPLACE FLOOR WIRE OR FRONT DOOR WIRE LH

    OK

  4. CHECK FLOOR WIRE


    1. B006ZKNC01
      *1 Side No. 2 Airbag Sensor LH
      *2 Airbag Sensor Assembly
      *3 Floor Wire
      *4 Service Wire
      *a

      Front view of wire harness connector

      (to Airbag Sensor Assembly)
      *b

      Front view of wire harness connector

      (to Side No. 2 Airbag Sensor LH)

      Connect the cable to the negative (-) battery terminal.

    2. Turn the ignition switch to ON.

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      R34-4 (BCL+) - Body ground Ignition switch ON Below 1 V
      R34-3 (BCL-) - Body ground Ignition switch ON Below 1 V

    4. Turn the ignition switch off.

    5. Disconnect the cable from the negative (-) battery terminal.

      CAUTION:

      Wait at least 90 seconds after disconnecting the cable from the negative (-) battery terminal to disable the SRS system.

    6. Using a service wire, connect terminals 32 (BBL+) and 31 (BBL-) of connector B.

      Note

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

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      R34-4 (BCL+) - R34-3 (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
      R34-4 (BCL+) - R34-3 (BCL-) Always 1 MΩ or higher
      R34-4 (BCL+) - Body ground Always 1 MΩ or higher
      R34-3 (BCL-) - Body ground Always 1 MΩ or higher
      Result
      Proceed to
      OK
      NG

    NG

    REPLACE FLOOR WIRE

    OK

  5. CHECK WIRE HARNESS


    1. B0070PFC07
      *1 Door Side Airbag Sensor LH
      *2 Side No. 2 Airbag Sensor LH
      *3 Front Door Wire LH
      *4 Floor Wire
      *5 Service Wire
      *a

      Front view of wire harness connector

      (to Side No. 2 Airbag Sensor LH)
      *b

      Front view of wire harness connector

      (to Door Side Airbag Sensor LH)

      Connect the connectors that link the floor wire and front door wire LH.

    2. Connect the cable to the negative (-) battery terminal.

    3. Turn the ignition switch to ON.

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      R34-1 (BDL+) - Body ground Ignition switch ON Below 1 V
      R34-2 (BDL-) - Body ground Ignition switch ON Below 1 V

    5. Turn the ignition switch off.

    6. Disconnect the cable from the negative (-) battery terminal.

      CAUTION:

      Wait at least 90 seconds after disconnecting the cable from the negative (-) battery terminal to disable the SRS system.

    7. Using a service wire, connect terminals 2 (BDL+) and 1 (BDL-) of connector E.

      Note

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

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      R34-1 (BDL+) - R34-2 (BDL-) Always Below 1 Ω

    9. Disconnect the service wire from connector E.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      R34-1 (BDL+) - R34-2 (BDL-) Always 1 MΩ or higher
      R34-1 (BDL+) - Body ground Always 1 MΩ or higher
      R34-2 (BDL-) - Body ground Always 1 MΩ or higher
      Result
      Proceed to
      OK
      NG

    NG

    CHECK FLOOR WIRE Click here

    OK

  6. CHECK SIDE NO. 2 AIRBAG SENSOR LH


    1. B0071UIC01
      *1 Side No. 2 Airbag Sensor RH
      *2 Airbag Sensor Assembly

      Connect the connectors to the door side airbag sensor LH and airbag sensor assembly.

    2. Interchange the side No. 2 airbag sensor LH with RH and connect the connectors.

    3. Connect the cable to the negative (-) battery terminal.

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

    5. Clear the DTCs stored in memory.


      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.


      Body Electrical > SRS Airbag > Trouble Codes

      Tech Tips

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

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

    9. Turn the ignition switch off.

    10. Disconnect the cable from the negative (-) battery terminal.

      CAUTION:

      Wait at least 90 seconds after disconnecting the cable from the negative (-) battery terminal to disable the SRS system.

    11. Return the side No. 2 airbag sensor LH and RH to their original positions and connect the connectors.


    A

    REPLACE AIRBAG SENSOR ASSEMBLY Click here

    B

    REPLACE SIDE NO. 2 AIRBAG SENSOR LH Click here

    C

    USE SIMULATION METHOD TO CHECK Click here

  7. CHECK FLOOR WIRE


    1. B006XZEC20
      *1 Door Side Airbag Sensor LH
      *2 Side No. 2 Airbag Sensor LH
      *3 Front Door Wire LH
      *4 Floor Wire
      *5 Service Wire
      *a

      Front view of wire harness connector

      (to Side No. 2 Airbag Sensor LH)
      *b

      Front view of wire harness connector

      (to Front Door Wire LH)

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

    2. Connect the cable to the negative (-) battery terminal.

    3. Turn the ignition switch to ON.

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      OR1-23 (BDL+) - Body ground Ignition switch ON Below 1 V
      OR1-41 (BDL-) - Body ground Ignition switch ON Below 1 V

    5. Turn the ignition switch off.

    6. Disconnect the cable from the negative (-) battery terminal.

      CAUTION:

      Wait at least 90 seconds after disconnecting the cable from the negative (-) battery terminal to disable the SRS system.

    7. Using a service wire, connect terminals 1 (BDL+) and 2 (BDL-) of connector B.

      Note

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

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      OR1-23 (BDL+) - OR1-41 (BDL-) Always Below 1 Ω

    9. Disconnect the service wire from connector B.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      OR1-23 (BDL+) - OR1-41 (BDL-) Always 1 MΩ or higher
      OR1-23 (BDL+) - Body ground Always 1 MΩ or higher
      OR1-41 (BDL-) - Body ground Always 1 MΩ or higher
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE FRONT DOOR WIRE LH

    NG

    REPLACE FLOOR WIRE