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 front side squib RH circuit consists of the center airbag sensor assembly 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 front side squib RH circuit.

DTC Code DTC Detection Condition Trouble Area
B1820/55

One of the following conditions is met:


  • The center airbag sensor assembly detects a line short circuit signal 5 times in the front side squib RH circuit during the primary check.

  • A front side squib RH malfunction.

  • A center airbag sensor assembly malfunction.

  • Front seat wire RH

  • Floor wire

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

  • Center airbag sensor assembly
B1821/55

One of the following conditions is met:


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

  • A front side squib RH malfunction.

  • A center airbag sensor assembly malfunction.
B1822/55

One of the following conditions is met:


  • The center airbag sensor assembly detects a short circuit to ground signal in the front side squib RH circuit for 0.5 seconds.

  • A front side squib RH malfunction.

  • A center airbag sensor assembly malfunction.
B1823/55

One of the following conditions is met:


  • The center airbag sensor assembly detects a short circuit to B+ signal in the front side squib RH circuit for 0.5 seconds.

  • A front side squib RH malfunction.

  • A center airbag sensor assembly malfunction.

WIRING DIAGRAM

A000PQLE09
*a Tc1
*b Front Seat Airbag Assembly RH (Front Side Squib RH)
*c Center 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.

  • When disconnecting the cable from the negative (-) auxiliary battery terminal while performing repairs, some systems need to be initialized after the cable is reconnected Click here.

Tech Tips

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

PROCEDURE


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


    1. A000OKLE03
      Text in Illustration
      *1 Front Side Squib RH
      *2 Center Airbag Sensor Assembly
      *3 Connector E
      *4 SST
      *a

      Front view of wire harness connector

      (to Front Side Squib RH)
      *b Color: Red

      Turn the power switch off.

    2. Disconnect the cable from the negative (-) auxiliary 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 E.

      CAUTION:

      Never connect the tester to the front seat airbag RH (front 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 cable to the negative (-) auxiliary battery terminal, and wait for at least 2 seconds.

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

    7. Clear the DTCs Click here.

    8. Turn the power switch off.

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

    10. Check for DTCs Click here.

      OK
      DTC B1820/55, B1821/55, B1822/55 or B1823/55 is not output.

      Tech Tips

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

    11. Turn the power switch off.

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

    13. Disconnect SST from connector E.


    OK

    REPLACE FRONT SEAT AIRBAG ASSEMBLY RH Click here

    NG

  2. CHECK CONNECTOR


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

    2. A000QY8E02
      Text in Illustration
      *1 Front Side Squib RH
      *2 Center Airbag Sensor Assembly

      Check that the connectors (on the center airbag sensor assembly side and front seat airbag RH side) are not damaged.

      OK
      The lock button is not disengaged, and the claw of the lock is not deformed or damaged.

    NG

    REPLACE HARNESS AND CONNECTOR

    OK

  3. CHECK FRONT SIDE SQUIB RH CIRCUIT


    1. A000O86E03
      Text in Illustration
      *1 Front Side Squib RH
      *2 Front Seat Wire RH
      *3 Floor Wire
      *4 Center Airbag Sensor Assembly
      *5 Connector E
      *a

      Front view of wire harness connector

      (to Front Side Squib RH)

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

    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
      c29-1 (SFR+) - Body ground Power switch on (IG) Below 1 V
      c29-2 (SFR-) - Body ground Power switch on (IG) Below 1 V

    4. Turn the power switch off.

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

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      c29-1 (SFR+) - c29-2 (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
      Tester Connection Condition Specified Condition
      c29-1 (SFR+) - c29-2 (SFR-) Always 1 MΩ or higher
      c29-1 (SFR+) - Body ground Always 1 MΩ or higher
      c29-2 (SFR-) - Body ground Always 1 MΩ or higher

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


    NG

    CHECK FRONT SEAT WIRE RH Click here

    OK

  4. CHECK CENTER AIRBAG SENSOR ASSEMBLY


    1. A000OXAE02
      Text in Illustration
      *1 Front Side Squib RH
      *2 Center Airbag Sensor Assembly

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

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

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

    4. Clear the DTCs Click here.

    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.

      OK
      DTC B1820/55, B1821/55, B1822/55 or B1823/55 is not output.

      Tech Tips

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


    OK

    USE SIMULATION METHOD TO CHECK Click here

    NG

    REPLACE CENTER AIRBAG SENSOR ASSEMBLY Click here

  5. CHECK FRONT SEAT WIRE RH


    1. A000N3GE04
      Text in Illustration
      *1 Front Side Squib RH
      *2 Front Seat Wire RH
      *3 Floor Wire
      *4 Center Airbag Sensor Assembly
      *5 Connector E
      *a

      Front view of wire harness connector

      (to Front Side Squib RH)

      Disconnect the front seat wire RH from the floor wire.

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

    3. Turn the power switch on (IG).

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      c29-1 (SFR+) - Body ground Power switch on (IG) Below 1 V
      c29-2 (SFR-) - Body ground Power switch on (IG) Below 1 V

    5. Turn the power switch off.

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

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      c29-1 (SFR+) - c29-2 (SFR-) Always Below 1 Ω

    8. Release the activation prevention mechanism built into connector D Click here.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      c29-1 (SFR+) - c29-2 (SFR-) Always 1 MΩ or higher
      c29-1 (SFR+) - Body ground Always 1 MΩ or higher
      c29-2 (SFR-) - Body ground Always 1 MΩ or higher

    10. Restore the released activation prevention mechanism of connector D to its original condition.


    OK

    REPLACE FLOOR WIRE

    NG

    REPLACE FRONT SEAT WIRE RH