AIRBAG SYSTEM, Diagnostic DTC:B1835, B1836, B1837, B1838

DTC Code DTC Name
B1835 Short in Front Passenger Side Curtain Shield Squib Circuit
B1836 Open in Front Passenger Side Curtain Shield Squib Circuit
B1837 Short to GND in Front Passenger Side Curtain Shield Squib Circuit
B1838 Short to B+ in Front Passenger Side Curtain Shield Squib Circuit

DESCRIPTION

The curtain shield airbag (P seat side) squib circuit consists of the center airbag sensor assembly and the curtain shield airbag assembly.

The circuit signals the SRS to deploy when airbag deployment conditions are met.

These DTCs are set when a malfunction is detected in the curtain shield airbag (P seat side) squib circuit.

DTC No. DTC Detecting Conditions Trouble Areas
B1835

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

  • Curtain shield airbag (P seat side) squib malfunction

  • Center airbag sensor assembly malfunction

  • Floor wire

  • Curtain shield airbag assembly (P seat side)

  • Center airbag sensor assembly
B1836

  • Center airbag sensor assembly receives open circuit signal in curtain shield airbag (P seat side) squib circuit for 2 seconds

  • Curtain shield airbag (P seat side) squib malfunction

  • Center airbag sensor assembly malfunction

  • Floor wire

  • Curtain shield airbag assembly (P seat side)

  • Center airbag sensor assembly
B1837

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

  • Curtain shield airbag (P seat side) squib malfunction

  • Center airbag sensor assembly malfunction

  • Floor wire

  • Curtain shield airbag assembly (P seat side)

  • Center airbag sensor assembly
B1838

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

  • Curtain shield airbag (P seat side) squib malfunction

  • Center airbag sensor assembly malfunction

  • Floor wire

  • Curtain shield airbag assembly (P seat side)

  • Center airbag sensor assembly

WIRING DIAGRAM

A0137H1E02

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 CURTAIN SHIELD AIRBAG ASSEMBLY (P SEAT SIDE)

    SST
    09843-18060

    1. A0137O8E02

      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 curtain shield airbag assembly.

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

      CAUTION:

      Never connect a tester to the curtain shield airbag 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 terminal 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 B1835, B1836, B1837 and B1838 are not output.

    OK

    REPLACE CURTAIN SHIELD AIR BAG ASSEMBLY RH (LHD)

    OK

    REPLACE CURTAIN SHIELD AIR BAG ASSEMBLY LH (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 floor wire connectors (on the curtain shield airbag assembly side) are 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 WIRE HARNESS

    OK

  3. CHECK CONNECTION OF CONNECTOR


    1. Check that the connectors are properly connected to the center airbag sensor assembly and the floor wire.

      OK
      The connectors are properly connected.

    NG

    CONNECT CONNECTOR

    OK

  4. CHECK FLOOR WIRE (CURTAIN SHIELD AIRBAG ASSEMBLY P SEAT SIDE CIRCUIT)


    1. A0137S6E02

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

    2. Turn the ignition switch to the ON position.

    3. Measure the voltage.

      Standard Voltage
      Tester Connection Condition Specified Condition
      H16-1 (ICR+) - Body ground (*1) Ignition switch ON Below 1 V
      H16-2 (ICR-) - Body ground (*1) Ignition switch ON Below 1 V
      H17-1 (ICL+) - Body ground (*2) Ignition switch ON Below 1 V
      H17-2 (ICL-) - Body ground (*2) Ignition switch ON Below 1 V

      *1:LHD

      *2:RHD

    4. Turn the ignition switch to the LOCK position.

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

    6. Measure the resistance.

      Standard Resistance
      Tester Connection Condition Specified Condition
      H16-1 (ICR+) - H16-2 (ICR-) (*1) Always Below 1 Ω
      H16-1 (ICR+) - Body ground (*1) Always 1 MΩ or Higher
      H16-2 (ICR-) - Body ground (*1) Always 1 MΩ or Higher
      H17-1 (ICL+) - H17-2 (ICL-) (*2) Always Below 1 Ω
      H17-1 (ICL+) - Body ground (*2) Always 1 MΩ or Higher
      H17-2 (ICL-) - Body ground (*2) Always 1 MΩ or Higher

      *1:LHD

      *2:RHD

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

    8. Measure the resistance.

      Standard Resistance
      Tester Connection Condition Specified Condition
      H16-1 (ICR+) - H16-2 (ICR-) (*1) Always 1 MΩ or Higher
      H17-1 (ICL+) - H17-2 (ICL-) (*2) Always 1 MΩ or Higher

      *1:LHD

      *2:RHD


    NG

    REPAIR OR REPLACE FLOOR WIRE

    OK

    REPLACE CENTER AIRBAG SENSOR ASSEMBLY