AIRBAG SYSTEM, Diagnostic DTC:B1815/54, B1816/54, B1817/54, B1818/54

DTC Code DTC Name
B1815/54 Short in Front Passenger Side Squib 2nd Step Circuit
B1816/54 Open in Front Passenger Side Squib 2nd Step Circuit
B1817/54 Short to GND in Front Passenger Side Squib 2nd Step Circuit
B1818/54 Short to B+ in Front Passenger Side Squib 2nd Step Circuit

DESCRIPTION

The front passenger side squib 2nd step circuit consists of the center airbag sensor and the front passenger airbag.

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

These DTCs are stored when a malfunction is detected in the front passenger side squib 2nd step circuit.

DTC Code DTC Detection Condition Trouble Area
B1815/54

When one of the following conditions is met:


  • The center airbag sensor receives a line short circuit signal 5 times in the front passenger side squib 2nd step circuit during the primary check.

  • A front passenger side squib 2nd step malfunction.

  • A center airbag sensor malfunction.


  • Instrument panel wire

  • Instrument panel wire assembly

  • Front passenger airbag assembly (Front passenger side squib 2nd step)

  • Center airbag sensor assembly

B1816/54

When one of the following conditions is met:


  • The center airbag sensor receives an open circuit signal in the front passenger side squib 2nd step circuit for 2 seconds.

  • A front passenger side squib 2nd step malfunction.

  • A center airbag sensor malfunction.


  • Instrument panel wire

  • Instrument panel wire assembly

  • Front passenger airbag assembly (Front passenger side squib 2nd step)

  • Center airbag sensor assembly

B1817/54

When one of the following conditions is met:


  • The center airbag sensor receives a short circuit to ground signal in the front passenger side squib 2nd step circuit for 0.5 seconds.

  • A front passenger side squib 2nd step malfunction.

  • A center airbag sensor malfunction.


  • Instrument panel wire

  • Instrument panel wire assembly

  • Front passenger airbag assembly (Front passenger side squib 2nd step)

  • Center airbag sensor assembly

B1818/54

When one of the following conditions is met:


  • The center airbag sensor receives a short circuit to B+ signal in the front passenger side squib 2nd step circuit for 0.5 seconds.

  • A front passenger side squib 2nd step malfunction.

  • A center airbag sensor malfunction.


  • Instrument panel wire

  • Instrument panel wire assembly

  • Front passenger airbag assembly (Front passenger side squib 2nd step)

  • Center airbag sensor assembly

WIRING DIAGRAM

A0156STE99

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, some systems need to be initialized after the cable is reconnected Click here.

Tech Tips

To perform the simulation method, enter the 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 type of road Click here.

PROCEDURE


  1. CHECK FRONT PASSENGER AIRBAG (FRONT PASSENGER SIDE SQUIB 2ND STEP)


    1. Turn the ignition switch off.

      A015D7EE06
    2. Disconnect the cable from the negative (-) battery terminal, and wait for at least 90 seconds.

    3. Disconnect the connectors from the front passenger airbag.

    4. Connect the white wire side of SST (resistance: 2.1 Ω) to connector E (black connector).

      CAUTION:

      Never connect the tester to the front passenger airbag (front passenger side squib 2nd step) 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 (-) 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 B1815, B1816, B1817 or B1818 is not output.

      Tech Tips

      Codes other than DTC B1815, B1816, B1817 and B1818 may be output at this time, but they are not related to this check.


    NG
    OK
  2. CHECK CONNECTOR


    1. 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 E.

    4. Check that the instrument panel wire connectors (on the front passenger airbag side) are not damaged.

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

    NG
    OK
  3. CHECK FRONT PASSENGER SIDE SQUIB 2ND STEP CIRCUIT


    1. Disconnect the connectors from the center airbag sensor.

      A015BR7E07
    2. Connect the cable to the negative (-) battery terminal, and wait for at least 2 seconds.

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      b4-1 (P2+) - Body ground Ignition switch ON Below 1 V
      b4-2 (P2-) - Body ground Ignition switch ON Below 1 V
    4. Turn the ignition switch off.

    5. Disconnect the cable from the negative (-) 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
      b4-1 (P2+) - b4-2 (P2-) 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
      b4-1 (P2+) - b4-2 (P2-) Always 1 MΩ or higher
      b4-1 (P2+) - Body ground Always 1 MΩ or higher
      b4-2 (P2-) - Body ground Always 1 MΩ or higher

    NG
    OK
  4. CHECK CENTER AIRBAG SENSOR


    1. A0156E9E02

      Connect the connectors to the front passenger airbag and the 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 B1815, B1816, B1817 or B1818 is not output.

      Tech Tips

      Codes other than DTC B1815, B1816, B1817 and B1818 may be output at this time, but they are not related to this check.


    NG
    OK
  5. CHECK INSTRUMENT PANEL WIRE (CENTER AIRBAG SENSOR - INSTRUMENT PANEL WIRE ASSEMBLY)


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

      A0155DWE04
    2. Disconnect the instrument panel wire connector from the instrument panel wire assembly.

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

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      Eb1-1 - Body ground Ignition switch ON Below 1 V
      Eb1-2 - Body ground Ignition switch ON Below 1 V
    5. Turn the ignition switch off.

    6. Disconnect the cable from the negative (-) 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
      Eb1-1 - Eb1-2 Always Below 1 Ω
    8. Release the activation prevention mechanism built into connector B Click here.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      Eb1-1 - Eb1-2 Always 1 MΩ or higher
      Eb1-1 - Body ground Always 1 MΩ or higher
      Eb1-2 - Body ground Always 1 MΩ or higher

    NG
    OK