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 assembly and the front passenger airbag.

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

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

DTC Code Detection Condition Trouble Area
B1815/54

One of the following conditions is met:


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

  • Front passenger side squib 2nd step malfunction

  • Center airbag sensor assembly malfunction

  • Instrument panel wire

  • Instrument panel wire assembly

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

  • Center airbag sensor assembly
B1816/54

One of the following conditions is met:


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

  • Front passenger side squib 2nd step malfunction

  • Center airbag sensor assembly malfunction

  • Instrument panel wire

  • Instrument panel wire assembly

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

  • Center airbag sensor assembly
B1817/54

One of the following conditions is met:


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

  • Front passenger side squib 2nd step malfunction

  • Center airbag sensor assembly malfunction

  • Instrument panel wire

  • Instrument panel wire assembly

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

  • Center airbag sensor assembly
B1818/54

One of the following conditions is met:


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

  • Front passenger side squib 2nd step malfunction

  • Center airbag sensor assembly malfunction

  • Instrument panel wire

  • Instrument panel wire assembly

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

  • Center airbag sensor assembly

WIRING DIAGRAM

A001DG1E01
*a Front Passenger Side Squib 2nd Step
*b Center Airbag Sensor Assembly

CAUTION / NOTICE / HINT

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 PASSENGER AIRBAG (FRONT PASSENGER SIDE SQUIB 2ND STEP)

    A001D2ZE03

    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 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 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 B1815, B1816, B1817, B1818 or 54 is not output.

      Tech Tips

      Codes other than DTC B1815, B1816, B1817, B1818 and 54 may be output at this time, but they are not related to this check.


    OK

    REPLACE FRONT PASSENGER AIRBAG ASSEMBLY Click here

    NG

  2. CHECK CONNECTOR


    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 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, or the claw of the lock is not damaged or deformed.

    NG

    REPLACE INSTRUMENT PANEL WIRE ASSEMBLY

    OK

  3. CHECK FRONT PASSENGER SIDE SQUIB 2ND STEP CIRCUIT

    A001A8VE03

    1. Disconnect the connectors from 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).

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

      Standard voltage
      Tester Connection Switch Condition Specified Condition
      K1-2 (P2+) - Body ground Engine switch on (IG) Below 1 V
      K1-1 (P2-) - Body ground Engine switch on (IG) Below 1 V

    5. Turn the engine switch off.

    6. Disconnect the negative (-) terminal cable from the battery, 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
      K1-2 (P2+) - K1-1 (P2-) 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
      K1-2 (P2+) - K1-1 (P2-) Always 1 MΩ or higher
      K1-2 (P2+) - Body ground Always 1 MΩ or higher
      K1-1 (P2-) - Body ground Always 1 MΩ or higher

    NG

    CHECK INSTRUMENT PANEL WIRE (CENTER AIRBAG SENSOR ASSEMBLY - INSTRUMENT PANEL WIRE ASSEMBLY) Click here

    OK

  4. CHECK CENTER AIRBAG SENSOR ASSEMBLY

    A001FF6E11
    *1 Front Passenger Side Squib 2nd Step
    *2 Center Airbag Sensor Assembly

    1. Connect the connectors to the front passenger airbag 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 B1815, B1816, B1817, B1818 or 54 is not output.

      Tech Tips

      Codes other than DTC B1815, B1816, B1817, B1818 and 54 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 INSTRUMENT PANEL WIRE (CENTER AIRBAG SENSOR ASSEMBLY - INSTRUMENT PANEL WIRE ASSEMBLY)

    A001DKFE02

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

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

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

    4. Turn the engine switch on (IG).

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

      Standard voltage
      Tester Connection Switch Condition Specified Condition
      LK1-3 - Body ground Engine switch on (IG) Below 1 V
      LK1-4 - Body ground Engine switch on (IG) Below 1 V

    6. Turn the engine switch off.

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

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

      Standard resistance
      Tester Connection Condition Specified Condition
      LK1-3 - LK1-4 Always Below 1 Ω

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

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

      Standard resistance
      Tester Connection Condition Specified Condition
      LK1-3 - LK1-4 Always 1 MΩ or higher
      LK1-3 - Body ground Always 1 MΩ or higher
      LK1-4 - Body ground Always 1 MΩ or higher

    OK

    REPLACE INSTRUMENT PANEL WIRE ASSEMBLY

    NG

    REPLACE INSTRUMENT PANEL WIRE