AIRBAG SYSTEM, Diagnostic DTC:B1820/55, B1821/55, B1822/55, 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 center airbag sensor and front seat side airbag assembly RH.

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

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

DTC Code DTC Detection Condition Trouble Area
B1820/55

One of the following conditions is met:


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

  • A side squib RH malfunction.

  • A center airbag sensor assembly malfunction.

  • No. 2 floor wire

  • Front seat side airbag assembly RH (side squib RH)

  • Center airbag sensor assembly
B1821/55

One of the following conditions is met:


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

  • A side squib RH malfunction.

  • A center airbag sensor assembly malfunction.
B1822/55

One of the following conditions is met:


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

  • A side squib RH malfunction.

  • A center airbag sensor assembly malfunction.
B1823/55

One of the following conditions is met:


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

  • A side squib RH malfunction.

  • A center airbag sensor assembly malfunction.

WIRING DIAGRAM

A004TGKE01
*a Front Seat Side Airbag Assembly RH
*b Center Airbag Sensor Assembly

CAUTION / NOTICE / HINT

Note


  • After turning the ignition switch off, waiting time may be required before disconnecting the cable from the battery terminal. Therefore, make sure to read the disconnecting the cable from the battery terminal notice before proceeding with work Click here.

  • When disconnecting the cable from the negative (-) battery terminal while performing repairs, some systems need to be initialized after the cable is reconnected Click here.

Tech Tips

To perform the simulation method, enter check mode (signal check) with the intelligent tester (See page ), and then wiggle each connector of the airbag system or drive the vehicle on various types of roads Click here.

PROCEDURE


  1. CHECK FRONT SEAT SIDE AIRBAG RH (SIDE SQUIB RH)


    1. A004Q49E02
      Text in Illustration
      *1 Front Seat Side Airbag Assembly RH
      *2 Center Airbag Sensor Assembly
      *3 Connector C
      *4 SST
      *a

      Front view of wire harness connector

      (to Front Seat Side Airbag Assembly RH)
      *b Color: Red

      Turn the ignition switch off.

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

    3. Disconnect the connector from the front seat side airbag RH.

    4. Connect the red wire side of SST (resistance: 2.1 Ω) to connector C.

      CAUTION:

      Never connect the tester to the front seat side airbag assembly RH (side squib 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 SST.

      • Insert SST straight into the terminals of the connector.

      SST
      09843-18061

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

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

    7. Clear the DTCs Click here.

    8. Turn the ignition switch off.

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

    10. Check for DTCs Click here.

      OK
      DTC B1820/55, B1821/55, B1822/55 or B1823/55 is not output.
      Result
      Result Proceed to
      OK (for Manual Seat) A
      OK (for Power Seat) B
      NG C

      Tech Tips

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


    A

    REPLACE SEPARATE TYPE FRONT SEATBACK ASSEMBLY RH Click here

    B

    REPLACE SEPARATE TYPE FRONT SEATBACK ASSEMBLY RH Click here

    C

  2. CHECK CONNECTORS


    1. A004PLYE02
      Text in Illustration
      *1 Front Seat Side Airbag Assembly RH
      *2 Center Airbag Sensor Assembly

      Turn the ignition switch off.

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

    3. Disconnect SST from connector C.

    4. Check that the No. 2 floor wire connector (on the front seat side airbag RH assembly side) is not damaged.

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

    NG

    REPLACE NO. 2 FLOOR WIRE

    OK

  3. CHECK NO. 2 FLOOR WIRE (SIDE SQUIB RH CIRCUIT)


    1. A004S8UE01
      Text in Illustration
      *1 Front Seat Side Airbag Assembly RH
      *2 No. 2 Floor Wire
      *3 Center Airbag Sensor Assembly
      *4 Connector C
      *a

      Front view of wire harness connector

      (to Front Seat Side Airbag Assembly RH)

      Disconnect the connector from the center airbag sensor.

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

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      H10-1 (SFR+) - Body ground Ignition switch ON Below 1 V
      H10-2 (SFR-) - Body ground Ignition switch ON Below 1 V

    4. Turn the ignition switch off.

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

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      H10-1 (SFR+) - H10-2 (SFR-) Always Below 1 Ω

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

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      H10-1 (SFR+) - H10-2 (SFR-) Always 1 MΩ or higher
      H10-1 (SFR+) - Body ground Always 1 MΩ or higher
      H10-2 (SFR-) - Body ground Always 1 MΩ or higher

    NG

    REPLACE NO. 2 FLOOR WIRE

    OK

  4. CHECK CENTER AIRBAG SENSOR ASSEMBLY

    A004SE2E02
    Text in Illustration
    *1 Front Seat Side Airbag Assembly RH
    *2 Center Airbag Sensor Assembly

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

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

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

    4. Clear the DTCs Click here.

    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.

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

      Tech Tips

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


    OK

    USE SIMULATION METHOD TO CHECK Click here

    NG

    REPLACE CENTER AIRBAG SENSOR ASSEMBLY Click here