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AIRBAG SYSTEM, Diagnostic DTC:B1820/55, B1821/55, B1822/55, B1823/55

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DTC Code DTC Name
B1820/55 Short in Front Driver Side - Side Squib Circuit
B1821/55 Open in Front Driver Side - Side Squib Circuit
B1822/55 Short to GND in Front Driver Side - Side Squib Circuit
B1823/55 Short to B+ in Front Driver Side - Side Squib Circuit
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DESCRIPTION

The front driver side - side squib circuit consists of the center airbag sensor assembly and the front seat side airbag assembly (Driver side).

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

These DTCs are recorded when a malfunction is detected in the front driver side - side squib circuit.

DTC No. DTC Detection Condition Trouble Area
B1820/55

  • The center airbag sensor assembly receives a line short circuit signal 5 times in the front driver side - side squib circuit during primary check.

  • Front driver side - side squib malfunction

  • Center airbag sensor assembly malfunction

  • Floor wire No. 2 (for LHD)

  • Floor wire (for RHD)

  • Front seat side airbag assembly (Front driver side - side squib)

  • Center airbag sensor assembly
B1821/55

  • The center airbag sensor assembly receives an open circuit signal in the front driver side - side squib circuit for 2 seconds.

  • Front driver side - side squib malfunction

  • Center airbag sensor assembly malfunction

  • Floor wire No. 2 (for LHD)

  • Floor wire (for RHD)

  • Front seat side airbag assembly (Front driver side - side squib)

  • Center airbag sensor assembly
B1822/55

  • The center airbag sensor assembly receives a short circuit to ground signal in the front driver side - side squib circuit for 0.5 seconds.

  • Front driver side - side squib malfunction

  • Center airbag sensor assembly malfunction

  • Floor wire No. 2 (for LHD)

  • Floor wire (for RHD)

  • Front seat side airbag assembly (Front driver side - side squib)

  • Center airbag sensor assembly
B1823/55

  • The center airbag sensor assembly receives a short circuit to B+ signal in the front driver side - side squib circuit for 0.5 seconds.

  • Front driver side - side squib malfunction

  • Center airbag sensor assembly malfunction

  • Floor wire No. 2 (for LHD)

  • Floor wire (for RHD)

  • Front seat side airbag assembly (Front driver side - side squib)

  • Center airbag sensor assembly
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WIRING DIAGRAM

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INSPECTION PROCEDURE

Tip:

  • Perform the simulation method by selecting the "check mode" (signal check) with the intelligent tester (Click here).

  • After selecting the "check mode" (signal check), perform the simulation method by wiggling each connector of the airbag system or driving the vehicle on a city or rough road (Click here).

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PROCEDURE


  1. Click here

    CHECK CONNECTORS


    1. A017F1FE07

      Turn the ignition switch off.

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

    3. Check that the connectors are properly connected to the front seat side airbag assembly (Driver side) and center airbag sensor assembly.

      OK
      The connectors are properly connected.
      Tip:

      If the connectors are not connected securely, reconnect the connectors and proceed to the next inspection.

    4. Disconnect the connectors from the front seat side airbag assembly (Driver side) and center airbag sensor assembly.

    5. Check that the connector terminals are not damaged.

      OK
      The terminals are not deformed or damaged.
      Result
      Result Proceed to
      OK A
      NG (for LHD) B
      NG (for RHD) C

  2. Click here

    CHECK FRONT SEAT SIDE AIRBAG ASSEMBLY (FRONT DRIVER SIDE - SIDE SQUIB)


    1. A017FQ2E02

      Connect the connector to the center airbag sensor assembly.

    2. Connect SST (resistance 2.1 Ω) to connector C.

      CAUTION:

      Never connect the tester to the front seat side airbag assembly (Front driver side - side squib) for measurement, as this may lead to a serious injury due to airbag deployment.

      Note:

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

      • Insert SST straight into the terminals of the connector.

      09843-18061

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

    4. Turn the ignition switch on (IG), 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 on (IG), and wait for at least 60 seconds.

    8. Check for DTCs (Click here).

      OK
      DTC B1820, B1821, B1822, B1823, or 55 is not output.
      Tip:

      Codes other than DTC B1820, B1821, B1822, B1823, and 55 may be output at this time, but they are not related to this check.


  3. Click here

    CHECK WIRE HARNESS (FRONT DRIVER SIDE - SIDE SQUIB CIRCUIT)


    1. A017CJ4E04

      Turn the ignition switch off.

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

    3. Disconnect SST from connector C.

    4. Disconnect the connector from the center airbag sensor assembly.

    5. Check for a short to B+ in the circuit.


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

      2. Turn the ignition switch on (IG).

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

        Standard voltage
        for LHD
        Tester Connection Switch Condition Specified Condition
        O5-1 (SFL+) - Body ground Ignition switch on (IG) Below 1 V
        O5-2 (SFL-) - Body ground Ignition switch on (IG) Below 1 V
        for RHD
        Tester Connection Switch Condition Specified Condition
        N5-1 (SFR+) - Body ground Ignition switch on (IG) Below 1 V
        N5-2 (SFR-) - Body ground Ignition switch on (IG) Below 1 V
        Result
        Result Proceed to
        OK A
        NG (for LHD) B
        NG (for RHD) C

    6. Check for an open in the circuit.


      1. Turn the ignition switch off.

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

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

        Standard resistance
        for LHD
        Tester Connection Switch Condition Specified Condition
        O5-1 (SFL+) - O5-2 (SFL-) Always Below 1 Ω
        for RHD
        Tester Connection Switch Condition Specified Condition
        N5-1 (SFR+) - N5-2 (SFR-) Always Below 1 Ω
        Result
        Result Proceed to
        OK A
        NG (for LHD) B
        NG (for RHD) C

    7. Check for a short to ground in the circuit.


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

        Standard resistance
        for LHD
        Tester Connection Switch Condition Specified Condition
        O5-1 (SFL+) - Body ground Always 1 MΩ or higher
        O5-2 (SFL-) - Body ground Always 1 MΩ or higher
        for RHD
        Tester Connection Switch Condition Specified Condition
        N5-1 (SFR+) - Body ground Always 1 MΩ or higher
        N5-2 (SFR-) - Body ground Always 1 MΩ or higher
        Result
        Result Proceed to
        OK A
        NG (for LHD) B
        NG (for RHD) C

    8. Check for a short in the circuit.


      1. Release the activation prevention mechanism built into connector B (Click here).

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

        Standard resistance
        for LHD
        Tester Connection Switch Condition Specified Condition
        O5-1 (SFL+) - O5-2 (SFL-) Always 1 MΩ or higher
        for RHD
        Tester Connection Switch Condition Specified Condition
        N5-1 (SFR+) - N5-2 (SFR-) Always 1 MΩ or higher
        Result
        Result Proceed to
        OK A
        NG (for LHD) B
        NG (for RHD) C

  4. Click here

    CHECK CENTER AIRBAG SENSOR ASSEMBLY


    1. A017CM4E01

      Restore the released activation prevention mechanism of connector B to the original condition.

    2. Connect the connectors to the front seat side airbag assembly (Driver side) and the center airbag sensor assembly.

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

    4. Turn the ignition switch on (IG), 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 on (IG), and wait for at least 60 seconds.

    8. Check for DTCs (Click here).

      OK
      DTC B1820, B1821, B1822, B1823, or 55 is not output.
      Tip:

      Codes other than DTC B1820, B1821, B1822, B1823, and 55 may be output at this time, but they are not related to this check.


  5. Click here

    REPLACE FLOOR WIRE

  6. Click here

    REPLACE FLOOR WIRE NO. 2

  7. Click here

    REPLACE FRONT SEAT SIDE AIRBAG ASSEMBLY (DRIVER SIDE)Click here

  8. Click here

    REPLACE CENTER AIRBAG SENSOR ASSEMBLYClick here

  9. Click here

    USE SIMULATION METHOD TO CHECKClick here