AIRBAG SYSTEM, Diagnostic DTC:B1900, B1901, B1902, B1903

DTC Code DTC Name
B1900 Short in Driver Side Pretensioner Squib Circuit
B1901 Open in Driver Side Pretensioner Squib Circuit
B1902 Short to GND in Driver Side Pretensioner Squib Circuit
B1903 Short to B+ in Driver Side Pretensioner Squib Circuit

DESCRIPTION

The pretensioner squib (D seat side) circuit consists of the center airbag sensor assembly and the front seat outer belt assembly LH.

This circuit signals the SRS to deploy when airbag deployment conditions are met. These DTCs are set when a malfunction is detected in the pretensioner squib (D seat side) circuit.

DTC No. DTC Detecting Conditions Trouble Areas
B1900

  • Center airbag sensor assembly receives line short circuit signal in pretensioner squib (D seat side) circuit 5 times during check

  • Pretensioner squib (D seat side) malfunction

  • Center airbag sensor assembly malfunction

  • Floor wire

  • Front seat outer belt assembly (D seat side)

  • Center airbag sensor assembly
B1901

  • Center airbag sensor assembly receives open circuit signal in pretensioner squib (D seat side) circuit for 2 seconds

  • Pretensioner squib (D seat side) malfunction

  • Center airbag sensor assembly malfunction

  • Floor wire

  • Front seat outer belt assembly (D seat side)

  • Center airbag sensor assembly
B1902

  • Center airbag sensor assembly receives short circuit to ground signal in pretensioner squib (D seat side) circuit for 0.5 seconds

  • Pretensioner squib (D seat side) malfunction

  • Center airbag sensor assembly malfunction

  • Floor wire

  • Front seat outer belt assembly (D seat side)

  • Center airbag sensor assembly
B1903

  • Center airbag sensor assembly receives short circuit to B+ signal in pretensioner squib (D seat side) circuit for 0.5 seconds

  • Pretensioner squib (D seat side) malfunction

  • Center airbag sensor assembly malfunction

  • Floor wire

  • Front seat outer belt assembly (D seat side)

  • Center airbag sensor assembly

WIRING DIAGRAM

A0137H1E03

INSPECTION PROCEDURE

Tech Tips

Perform a check mode inspection after repairing the squib system to check if the repair has done correctly Click here.

PROCEDURE


  1. CHECK FRONT SEAT OUTER BELT ASSEMBLY

    SST
    09843-18060

    1. A01362SE01

      Turn the ignition switch to the LOCK position.

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

    3. Disconnect the connectors from the front seat outer belt assembly.

    4. Connect the white wire side of SST (resistance 2.1 Ω) to the floor wire.

      CAUTION:

      Never connect a tester to the front seat outer belt assembly (D squib) for measurement, as this may lead to serious injury due to airbag deployment.

      Note


      • Do not forcibly insert the SST into the terminals of the connector when connecting.

      • Insert the SST straight into the terminals of the connector.

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

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

    7. Clear the DTCs stored in memory Click here.

    8. Turn the ignition switch to the LOCK position.

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

    10. Check the DTCs Click here.

      OK
      DTC B1900, B1901, B1902 and B1903 are not output.

    OK

    REPLACE FRONT SEAT OUTER BELT ASSEMBLY LH (LHD)

    OK

    REPLACE FRONT SEAT OUTER BELT ASSEMBLY RH (RHD)

    NG

  2. CHECK CONNECTOR


    1. Turn the ignition switch to the LOCK position.

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

    3. Check that the connector (on the front seat outer belt assembly side) is not damaged Click here.

      OK
      The lock button is not disengaged, and the claw of the lock is not deformed or damaged.

    NG

    REPAIR OR REPLACE FLOOR WIRE

    OK

  3. CHECK CONNECTION OF CONNECTOR


    1. Check that the connectors are properly connected to the center airbag sensor assembly and the front seat outer belt assembly.

      OK
      The connectors are properly connected.

    NG

    CONNECT CONNECTOR

    OK

  4. CHECK FLOOR WIRE


    1. A0137NJE01

      Disconnect the floor wire connectors from the center airbag sensor assembly and front seat outer belt assembly.

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

    3. Turn the ignition switch to the ON position.

    4. Measure the voltage.

      Standard Voltage
      Tester Connection Condition Specified Condition
      H8-1(PD+) - Body ground (*1) Ignition switch ON Below 1 V
      H8-2(PD-) - Body ground (*1) Ignition switch ON Below 1 V
      H9-1(PD+) - Body ground (*2) Ignition switch ON Below 1 V
      H8-2(PD-) - Body ground (*2) Ignition switch ON Below 1 V

      *1:LHD

      *2:RHD

    5. Turn the ignition switch to the LOCK position.

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

    7. Measure the resistance.

      Standard Resistance
      Tester Connection Condition Specified Condition
      H8-1(PD+) - H8-2(PD-)(*1) Always Below 1 Ω
      H8-1(PD+) - Body ground (*1) Always 1 MΩ or Higher
      H8-2(PD-) - Body ground (*1) Always 1 MΩ or Higher
      H9-1(PD+) - H9-2(PD-)(*2) Always Below 1 Ω
      H9-1(PD+) - Body ground(*2) Always 1 MΩ or Higher
      H9-2(PD-) - Body ground(*2) Always 1 MΩ or Higher

      *1:LHD

      *2:RHD

    8. Release the activation prevention mechanism built into connector B Click here.

    9. Measure the resistance.

      Standard Resistance
      Tester Connection Condition Specified Condition
      H8-1(PD+)-H8-2(PD-)(*1) Always 1 MΩ or Higher
      H9-1(PD+)-H9-2(PD-)(*2) Always 1 MΩ or Higher

      *1:LHD

      *2:RHD


    NG

    REPAIR OR REPLACE FLOOR WIRE

    OK

    REPLACE CENTER AIRBAG SENSOR ASSEMBLY