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 the front seat side airbag RH.

This 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 Code 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 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

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.

  • 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

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.

  • 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

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.

  • 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

A01GLA0E01

INSPECTION PROCEDURE

Note


  • After turning the engine 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 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


  • 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 FRONT SEAT SIDE AIRBAG RH (SIDE SQUIB RH)

    A01GJO1E29

    1. Turn the engine switch off.

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

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

    7. Clear the DTCs Click here.

    8. Turn the engine switch off.

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

    10. 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 ASSEMBLY RH Click here

  2. CHECK FLOOR WIRE (SIDE SQUIB RH CIRCUIT)

    A01GHJNE23

    1. Turn the engine switch off.

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

    3. Disconnect SST from connector C.

    4. Disconnect the connectors from the center airbag sensor assembly.

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

    6. Turn the engine switch on (IG).

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

      Standard voltage
      Tester Connection Switch Condition Specified Condition
      R4-1 (SFR+) - Body ground Engine switch on (IG) Below 1 V
      R4-2 (SFR-) - Body ground Engine switch on (IG) Below 1 V

    8. Turn the engine switch off.

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

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

      Standard resistance
      Tester Connection Condition Specified Condition
      R4-1 (SFR+) - R4-2 (SFR-) Always Below 1 Ω

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

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

      Standard resistance
      Tester Connection Condition Specified Condition
      R4-1 (SFR+) - R4-2 (SFR-) Always 1 MΩ or higher
      R4-1 (SFR+) - Body ground Always 1 MΩ or higher
      R4-2 (SFR-) - Body ground Always 1 MΩ or higher

    NG

    REPLACE FLOOR WIRE

    OK

  3. CHECK CENTER AIRBAG SENSOR ASSEMBLY

    A01GJG3E41

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

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

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

    4. Clear the DTCs Click here.

    5. Turn the engine switch off.

    6. Turn the engine switch on (IG), 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

      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