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

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

DESCRIPTION

The 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 driver side - side squib circuit.

DTC No. DTC Detection Condition Trouble Area
B1820/55

When one of following conditions is met:


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

  • Driver side - side squib malfunction

  • Center airbag sensor assembly malfunction

  • Floor wire

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

  • Center airbag sensor assembly
B1821/55

When one of following conditions is met:


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

  • Driver side - side squib malfunction

  • Center airbag sensor assembly malfunction

  • Floor wire

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

  • Center airbag sensor assembly
B1822/55

When one of following conditions is met:


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

  • Driver side - side squib malfunction

  • Center airbag sensor assembly malfunction

  • Floor wire

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

  • Center airbag sensor assembly
B1823/55

When one of following conditions is met:


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

  • Driver side - side squib malfunction

  • Center airbag sensor assembly malfunction

  • Floor wire

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

  • Center airbag sensor assembly

WIRING DIAGRAM

A011A64E01

INSPECTION PROCEDURE

Tech Tips


  • Perform the simulation method by selecting Check Mode (signal check) with the intelligent tester 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 various types of roads Click here.

PROCEDURE


  1. CHECK CONNECTOR


    1. Turn the ignition switch off.

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

    3. Check that the connector is properly connected to the front seat side airbag assembly (driver side).

      OK
      The connector is properly connected.

      Tech Tips

      If the connector is not connected securely, reconnect the connector and proceed to the next inspection.

    4. Disconnect the connector from the front seat side airbag assembly (driver side).

    5. Check that the terminal of the connector is not damaged.

      OK
      The terminal is not deformed or damaged.

    NG

    REPLACE FLOOR WIRE

    OK

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

    A011BHRE01
    Text in Illustration
    *A for LHD
    *B for RHD
    *a Driver Side - Side Squib
    *b Center Airbag Sensor Assembly
    *c

    Front view of wire harness connector

    (to Driver Side - Side Squib)
    *d Connector C
    *e Color: Black
    SST
    09843-18061

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

      CAUTION:

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

      • Insert SST straight into the terminals of the connector.

    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 stored in the memory 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, B1821, B1822, B1823 or 55 is not output.

      Tech Tips

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


    NG

    CHECK CONNECTOR Click here

    OK

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

  3. CHECK CONNECTOR


    1. 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 connector is properly connected to the center airbag sensor assembly.

      OK
      The connector is properly connected.

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

    6. Check that the terminal of the connector is not damaged.

      OK
      The terminal is not deformed or damaged.

    7. Check that the short spring for the floor wire connector with the activation prevention mechanism is not deformed or damaged.

      OK
      The short spring is not deformed or damaged.

    NG

    REPLACE FLOOR WIRE

    OK

  4. CHECK FLOOR WIRE (DRIVER SIDE - SIDE SQUIB - CENTER AIRBAG SENSOR ASSEMBLY)

    A0116XWE01
    Text in Illustration
    *A for LHD
    *B for RHD
    *a Driver Side - Side Squib
    *b Center Airbag Sensor Assembly
    *c Floor Wire
    *d

    Front view of wire harness connector

    (to Driver Side - Side Squib)
    *e Connector C

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

    2. Turn the ignition switch to ON.

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

      Standard Voltage
      for LHD
      Tester Connection Switch Condition Specified Condition
      G19-1 (SFL-) - Body ground Ignition switch ON Below 1 V
      G19-2 (SFL+) - Body ground Ignition switch ON Below 1 V
      for RHD
      Tester Connection Switch Condition Specified Condition
      G18-1 (SFR-) - Body ground Ignition switch ON Below 1 V
      G18-2 (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
      for LHD
      Tester Connection Condition Specified Condition
      G19-1 (SFL-) - G19-2 (SFL+) Always Below 1 Ω
      for RHD
      Tester Connection Condition Specified Condition
      G18-1 (SFR-) - G18-2 (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
      for LHD
      Tester Connection Condition Specified Condition
      G19-1 (SFL-) - G19-2 (SFL+) Always 1 MΩ or higher
      G19-1 (SFL-) - Body ground Always 1 MΩ or higher
      G19-2 (SFL+) - Body ground Always 1 MΩ or higher
      for RHD
      Tester Connection Condition Specified Condition
      G18-1 (SFR-) - G18-2 (SFR+) Always 1 MΩ or higher
      G18-1 (SFR-) - Body ground Always 1 MΩ or higher
      G18-2 (SFR+) - Body ground Always 1 MΩ or higher

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


    NG

    REPLACE FLOOR WIRE

    OK

  5. CHECK CENTER AIRBAG SENSOR ASSEMBLY


    1. Connect the connectors to the front seat side airbag assembly (driver side) and the 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 stored in the memory 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, B1821, B1822, B1823 or 55 is not output.

      Tech Tips

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


    NG

    REPLACE CENTER AIRBAG SENSOR ASSEMBLY Click here

    OK

    USE SIMULATION METHOD TO CHECK Click here