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

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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
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DESCRIPTION

The side squib RH circuit consists of the center airbag sensor and front seat airbag 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 detects 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 malfunction.

  • Floor wire

  • Front seat airbag assembly RH (Side squib RH)

  • Center airbag sensor assembly
B1821/55

One of the following conditions is met:


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

  • A side squib RH malfunction.

  • A center airbag sensor malfunction.

  • Floor wire

  • Front seat airbag assembly RH (Side squib RH)

  • Center airbag sensor assembly
B1822/55

One of the following conditions is met:


  • The center airbag sensor detects 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 malfunction.

  • Floor wire

  • Front seat airbag assembly RH (Side squib RH)

  • Center airbag sensor assembly
B1823/55

One of the following conditions is met:


  • The center airbag sensor detects 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 malfunction.

  • Floor wire

  • Front seat airbag assembly RH (Side squib RH)

  • Center airbag sensor assembly
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WIRING DIAGRAM

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INSPECTION PROCEDURE

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).

Tip:

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

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PROCEDURE


  1. Click here

    CHECK FRONT SEAT AIRBAG ASSEMBLY RH (SIDE SQUIB RH)


    1. A01DO76E07

      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 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 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.

      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, B1821, B1822 or B1823 is not output.
      Tip:

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

      Table 1. Text in Illustration
      *1 Side Squib RH
      *2 Center Airbag Sensor
      *3 Connector C
      *4 SST
      *a

      Front view of wire harness connector

      (to Side Squib RH)

  2. Click here

    CHECK FLOOR WIRE (SIDE SQUIB RH CIRCUIT)


    1. A01DRFPE08

      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. Disconnect the connectors from the center airbag sensor.

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

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      Q7-1 (SFR+) - Body ground Ignition switch ON Below 1 V
      Q7-2 (SFR-) - Body ground Ignition switch ON Below 1 V

    7. Turn the ignition switch off.

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

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      Q7-1 (SFR+) - Q7-2 (SFR-) Always Below 1 Ω

    10. Release the activation prevention mechanism built into connector B (Click here).

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      Q7-1 (SFR+) - Q7-2 (SFR-) Always 1 MΩ or higher
      Q7-1 (SFR+) - Body ground Always 1 MΩ or higher
      Q7-2 (SFR-) - Body ground Always 1 MΩ or higher
      Table 2. Text in Illustration
      *1 Side Squib RH
      *2 No. 2 Floor Wire
      *3 Center Airbag Sensor
      *4 Connector C
      *a

      Front view of wire harness connector

      (to Side Squib RH)

  3. Click here

    CHECK CENTER AIRBAG SENSOR


    1. A01DNOEE37

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

    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, B1821, B1822 or B1823 is not output.
      Tip:

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

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

  4. Click here

    REPLACE FRONT SEAT AIRBAG ASSEMBLY RHClick here

  5. Click here

    REPLACE FLOOR WIRE

  6. Click here

    REPLACE CENTER AIRBAG SENSOR ASSEMBLYClick here

  7. Click here

    USE SIMULATION METHOD TO CHECKClick here