AIRBAG SYSTEM, Diagnostic DTC:B1821/55

DTC Code DTC Name
B1821/55 Open 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.

DTC B1821/55 is stored when an open is detected in the side squib RH circuit.

DTC No. Detection Item DTC Detection Condition Trouble Area Test Mode / 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

  • No. 2 floor wire

  • Side squib RH (Front seat airbag assembly RH)

  • Airbag sensor assembly

 Applies to check mode

WIRING DIAGRAM

A01MIN8E01
*a Side Squib RH (Front Seat Airbag Assembly RH)
*b Airbag Sensor Assembly

CAUTION / NOTICE / HINT

Note

After turning the power switch off, waiting time may be required before disconnecting the cable from the negative (-) auxiliary battery terminal. Therefore, make sure to read the disconnecting the cable from the negative (-) auxiliary battery terminal notices before proceeding with work.

Click here

Tech Tips


  • 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 here

PROCEDURE


  1. CHECK CONNECTORS


    1. A01MJMXC01
      *1 Front Seat Airbag Assembly RH
      *2 Airbag Sensor Assembly
      *3 No. 2 Floor Wire

      Turn the power switch off.

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

    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.

      Tech Tips

      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 spring for the No. 2 floor wire with the activation prevention mechanism is not deformed or damaged.

      OK
      The short spring is not deformed or damaged.
      Result
      Proceed to
      OK
      NG

    NG

    REPLACE NO. 2 FLOOR WIRE

    OK

  2. CHECK NO. 2 FLOOR WIRE


    1. A01MI7RC01
      *1 Front Seat Airbag Assembly RH
      *2 Airbag Sensor Assembly
      *3 No. 2 Floor Wire
      *a

      Front view of wire harness connector

      (to Front Seat Airbag Assembly RH)

      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
        Q2-1 (SFR+) - Q2-2 (SFR-) Always Below 1 Ω
      Result
      Proceed to
      OK
      NG

    NG

    REPLACE NO. 2 FLOOR WIRE

    OK

  3. CHECK DTC


    1. A01MG4BC01
      *1 Front Seat Airbag Assembly RH
      *2 Airbag Sensor Assembly
      *a

      Front view of wire harness connector

      (to Front Seat Airbag Assembly RH)
      *b Service Wire

      Connect the connectors to the airbag sensor assembly.

    2. Using a service wire, connect terminals 1 (SFR+) and 2 (SFR-) of connector C.

      Note

      Do not forcibly insert the service wire into the terminals of the connector when connecting the wire.

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

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

    5. Clear the DTCs stored in memory.

      Click here


      Body Electrical > SRS Airbag > Clear DTCs

    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


      Body Electrical > SRS Airbag > Trouble Codes
      OK
      DTC B1821/55 is not output.

      Tech Tips

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

    9. Turn the power switch off.

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

    11. Disconnect the service wire from connector C.

      Result
      Proceed to
      OK
      NG

    NG

    REPLACE AIRBAG SENSOR ASSEMBLY Click here

    OK

  4. CHECK DTC


    1. A01MHMPC01
      *1 Front Seat Airbag Assembly RH
      *2 Airbag Sensor Assembly

      Connect the connectors to the front seat airbag assembly RH.

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

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

    4. Clear the DTCs stored in memory.

      Click here


      Body Electrical > SRS Airbag > Clear DTCs

    5. Turn the power switch off.

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

    7. Check for DTCs.

      Click here


      Body Electrical > SRS Airbag > Trouble Codes
      OK
      DTC B1821/55 is not output.

      Tech Tips

      Codes other than DTC B1821/55 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 here

    NG

    REPLACE FRONT SEAT AIRBAG ASSEMBLY RH Click here