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

DTC Code DTC Name
B1820/55 Short in Side Squib RH Circuit
B1821/55 Open in Side Squib RH Circuit
B1822/55 Short to GND in Side Squib RH Circuit
B1823/55 Short to B+ in Side Squib RH Circuit

DESCRIPTION

The side squib RH circuit consists of the airbag sensor assembly and front seat airbag assembly RH.

The airbag sensor assembly uses this circuit to deploy the airbag when deployment conditions are met.

These DTCs are stored when a malfunction is detected in the side squib RH circuit.

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

Test Mode / Check Mode

B1820/55

Short in Side Squib RH Circuit

  • The airbag sensor assembly detects a line short in the side squib RH circuit during primary check.

  • Side squib RH malfunction

  • Airbag sensor assembly malfunction

  • Floor wire

  • Side squib RH (Front seat airbag assembly RH)

  • Airbag sensor assembly

Applies to check mode

B1821/55

Open in Side Squib RH Circuit

  • The airbag sensor assembly detects an open in the side squib RH circuit.

  • Side squib RH malfunction

  • Airbag sensor assembly malfunction

  • Floor wire

  • Side squib RH (Front seat airbag assembly RH)

  • Airbag sensor assembly

Applies to check mode

B1822/55

Short to GND in Side Squib RH Circuit

  • The airbag sensor assembly detects a short to ground in the side squib RH circuit.

  • Side squib RH malfunction

  • Airbag sensor assembly malfunction

  • Floor wire

  • Side squib RH (Front seat airbag assembly RH)

  • Airbag sensor assembly

Applies to check mode

B1823/55

Short to B+ in Side Squib RH Circuit

  • The airbag sensor assembly detects a short to B+ in the side squib RH circuit.

  • Side squib RH malfunction

  • Airbag sensor assembly malfunction

  • Floor wire

  • Side squib RH (Front seat airbag assembly RH)

  • Airbag sensor assembly

Applies to check mode

WIRING DIAGRAM

C284697E93

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 hereClick here

Tip:

  • Perform the simulation method by selecting check mode (Signal Check) using the GTS.

    Click here

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

    Click hereClick hereClick here

PROCEDURE

  1. CHECK CONNECTORS

    1. C304235C01

      *1

      Front Seat Airbag Assembly RH

      *2

      Airbag Sensor Assembly

      *3

      Floor Wire

      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 front seat airbag assembly RH and airbag sensor assembly.

      OK

      The connectors are properly connected.

      Tip:

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

    4. Disconnect the connectors from the front seat airbag assembly RH and airbag sensor assembly.

    5. Check that the terminals of the connectors are not damaged.

      OK

      The terminals are not deformed or damaged.

    6. Check that the short springs of the activation prevention mechanism of the floor wire are not deformed or damaged.

      OK

      The short springs are not deformed or damaged.

    Result

    Proceed to

    OK

    NG
    NG

    REPLACE FLOOR WIRE

    OK

  2. CHECK FRONT SEAT AIRBAG ASSEMBLY RH

    1. C304236C01

      *1

      Front Seat Airbag Assembly RH

      *2

      Airbag Sensor Assembly

      *a

      Front view of wire harness connector

      (to Front Seat Airbag Assembly RH)

      Connect the connector to the airbag sensor assembly.

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

      CAUTION:

      Never connect a tester to the front seat airbag assembly RH 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 it.

      • Insert SST straight into the terminals of the connector.

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

    4. Clear the DTCs stored in memory.

      Click here

      Body Electrical > SRS Airbag > Clear DTCs

    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

      Body Electrical > SRS Airbag > Trouble Codes

      OK

      DTC B1820/55, B1821/55, B1822/55 or B1823/55 is not output.

      Tip:

      Codes other than DTCs B1820/55, B1821/55, B1822/55 and B1823/55 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.

      CAUTION:

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

    10. Disconnect SST from connector C.

    09843-18061

    Result

    Proceed to

    OK

    NG
    OK

    REPLACE FRONT SEAT AIRBAG ASSEMBLY RH

    Click here

    NG

  3. CHECK FLOOR WIRE

    1. C304237C01

      *1

      Front Seat Airbag Assembly RH

      *2

      Airbag Sensor Assembly

      *3

      Floor Wire

      *a

      Front view of wire harness connector

      (to Front Seat Airbag Assembly RH)

      Disconnect the floor wire from the airbag sensor assembly.

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

      1. 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

        K29-4 (SFR+) - Body ground

        Ignition switch ON

        Below 1 V

        K29-3 (SFR-) - 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.

    3. Check for an open in the circuit.

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

        Standard Resistance

        Tester Connection

        Condition

        Specified Condition

        K29-4 (SFR+) - K29-3 (SFR-)

        Always

        Below 1 Ω

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

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

        Standard Resistance

        Tester Connection

        Condition

        Specified Condition

        K29-4 (SFR+) - Body ground

        Always

        1 MΩ or higher

        K29-3 (SFR-) - Body ground

        Always

        1 MΩ or higher

    5. Check for a short in the circuit.

      1. Release the activation prevention mechanism built into connector B.

        Click hereClick here

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

        Standard Resistance

        Tester Connection

        Condition

        Specified Condition

        K29-4 (SFR+) - K29-3 (SFR-)

        Always

        1 MΩ or higher

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

    Result

    Proceed to

    OK

    NG
    NG

    REPLACE FLOOR WIRE

    OK

  4. CHECK DTC

    1. C304238C01

      *1

      Front Seat Airbag Assembly RH

      *2

      Airbag Sensor Assembly

      Connect the connectors to the front seat airbag assembly RH and airbag sensor assembly.

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

    3. Clear the DTCs stored in memory.

      Click here

      Body Electrical > SRS Airbag > Clear DTCs

    4. Turn the ignition switch off.

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

    6. Check for DTCs.

      Click here

      Body Electrical > SRS Airbag > Trouble Codes

      OK

      DTC B1820/55, B1821/55, B1822/55 or B1823/55 is not output.

      Tip:

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

    Result

    Proceed to

    OK

    NG
    OK

    USE SIMULATION METHOD TO CHECK

    Click hereClick hereClick here

    NG

    REPLACE AIRBAG SENSOR ASSEMBLY

    Click here