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 assembly and front seat side airbag assembly RH.

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

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

DTC No. DTC Detection Condition Trouble Area
B1820/55

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

  • Side squib RH malfunction

  • Center airbag sensor assembly malfunction

  • Floor wire

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

  • Center airbag sensor assembly
B1821/55

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

  • Side squib RH malfunction

  • Center airbag sensor assembly malfunction

  • Floor wire

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

  • Center airbag sensor assembly
B1822/55

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

  • Side squib RH malfunction

  • Center airbag sensor assembly malfunction

  • Floor wire

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

  • Center airbag sensor assembly
B1823/55

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

  • Side squib RH malfunction

  • Center airbag sensor assembly malfunction

  • Floor wire

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

  • Center airbag sensor assembly

WIRING DIAGRAM

A01NCZ5E01

INSPECTION PROCEDURE

Tech Tips


  • Perform the simulation method by selecting check mode (Signal Check) using 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 a city or rough road Click here.

PROCEDURE


  1. CHECK CONNECTORS


    1. A01NH5BE01
      Text in Illustration
      *1 Side Squib RH
      *2 Center Airbag Sensor Assembly
      *3 Floor Wire

      Turn the power switch off.

    2. Disconnect the cable from the negative (-) battery terminal.

      Note

      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 side airbag assembly RH and center airbag sensor assembly.

      OK
      The connectors are properly connected.

      Tech Tips

      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 RH and center 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 spring for the floor wire with the activation prevention mechanism is not deformed or damaged.

      OK
      The short spring is not deformed or damaged.

    NG

    REPLACE FLOOR WIRE

    OK

  2. CHECK FRONT SEAT SIDE AIRBAG ASSEMBLY RH (SIDE SQUIB RH)


    1. A01NGKUE01
      Text in Illustration
      *1 Side Squib RH
      *2 Center Airbag Sensor Assembly
      *3

      Front view of wire harness connector

      (to Front Seat Side Airbag Assembly RH)
      *4 Connector C

      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 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.

      • Insert SST straight into the terminals of the connector.

      SST
      09843-18061

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

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

    5. Clear the DTCs stored in the memory Click here.

    6. Turn the power switch off.

    7. Turn the power 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.

      Tech Tips

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


    NG

    CHECK FLOOR WIRE (SIDE SQUIB RH CIRCUIT) Click here

    OK

    REPLACE FRONT SEAT SIDE AIRBAG ASSEMBLY RH Click here

  3. CHECK FLOOR WIRE (SIDE SQUIB RH CIRCUIT)


    1. A01NDSDE01
      Text in Illustration
      *1 Side Squib RH
      *2 Center Airbag Sensor Assembly
      *3 Floor Wire
      *4

      Front view of wire harness connector

      (to Front Seat Side Airbag Assembly RH)
      *5 Connector C

      Turn the power switch off.

    2. Disconnect the cable from the negative (-) battery terminal.

      Note

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

    3. Disconnect SST from connector C.

    4. Disconnect the floor wire from the center airbag sensor assembly.

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


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

      2. Turn the power switch on (IG).

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

        Standard Voltage
        Tester Connection Switch Condition Specified Condition
        O10-1 (SFR+) - Body ground Power switch on (IG) Below 1 V
        O10-2 (SFR-) - Body ground Power switch on (IG) Below 1 V

    6. Check for an open in the circuit.


      1. Turn the power switch off.

      2. Disconnect the cable from the negative (-) battery terminal.

        Note

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

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

        Standard Resistance
        Tester Connection Condition Specified Condition
        O10-1 (SFR+) - O10-2 (SFR-) Always Below 1 Ω

    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
        Tester Connection Condition Specified Condition
        O10-1 (SFR+) - Body ground Always 1 MΩ or higher
        O10-2 (SFR-) - Body ground Always 1 MΩ or higher

    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
        Tester Connection Condition Specified Condition
        O10-1 (SFR+) - O10-2 (SFR-) Always 1 MΩ or higher

    NG

    REPLACE FLOOR WIRE

    OK

  4. CHECK CENTER AIRBAG SENSOR ASSEMBLY


    1. A01NHVHE01
      Text in Illustration
      *1 Side Squib RH
      *2 Center Airbag Sensor Assembly

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

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

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

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

    5. Clear the DTCs stored in the memory Click here.

    6. Turn the power switch off.

    7. Turn the power 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.

      Tech Tips

      Codes other than DTC 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