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 front passenger airbag assembly.

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 No. DTC Detection Condition Trouble Area
B1815/54
  • The center airbag sensor assembly receives a line short circuit signal 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
  • The center airbag sensor assembly receives an open circuit signal in the front passenger side squib 2nd step circuit.

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

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

  • 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

A01NGF8E04

INSPECTION PROCEDURE

Tech Tips


  • Perform the simulation method by selecting check mode (Signal Check) using 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 a city or rough road Click here.

PROCEDURE


  1. CHECK CONNECTORS


    1. A01NEUTE01
      Text in Illustration
      *1 Front Passenger Side Squib 2nd Step
      *2 Center Airbag Sensor Assembly
      *3 Instrument Panel Wire Assembly
      *4 Instrument Panel Wire

      Turn the power switch off.

    2. Disconnect the cable from the negative (-) battery terminal.

      Note

      Wait at least 90 seconds after disconnecting the cable from the negative (-) battery terminal to disable the SRS system.

    3. Check that the connectors are properly connected to the front passenger airbag assembly and center airbag sensor assembly. Also check that the connectors that link the instrument panel wire and instrument panel wire assembly are properly connected.

      OK
      The connectors are properly connected.

      Tech Tips

      If the connectors are not connected securely, reconnect the connectors and proceed to the next inspection.

    4. Disconnect the connectors from the front passenger airbag assembly and center airbag sensor assembly. Also disconnect the instrument panel wire from the instrument panel wire assembly.

    5. Check that the terminals of the connectors are not damaged.

      OK
      The terminals are not deformed or damaged.
    6. Check that the instrument panel wire assembly connector (on the front passenger airbag assembly side) is not damaged.

      OK
      The lock button is not disengaged, and the claw of the lock is not deformed or damaged.
    7. Check that the short springs for the instrument panel wire and instrument panel wire assembly with the activation prevention mechanism are not deformed or damaged.

      OK
      The short springs are not deformed or damaged.

    NG
    OK
  2. CHECK FRONT PASSENGER AIRBAG ASSEMBLY (FRONT PASSENGER SIDE SQUIB 2ND STEP)


    1. A01NENXE05
      Text in Illustration
      *1 Front Passenger Side Squib 2nd Step
      *2 Center Airbag Sensor Assembly
      *3

      Front view of wire harness connector

      (to Front Passenger Airbag Assembly)

      *4 Connector E
      *5 Color: Black

      Connect the instrument panel wire to the instrument panel wire assembly and center airbag sensor assembly.

    2. Connect SST (resistance 2.1 Ω) to connector E (black connector).

      CAUTION:

      Never connect the tester to the front passenger airbag assembly (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.

      • Insert SST straight into the terminals of the connector.

      SST
      09843-18061
    3. Connect the cable to the negative (-) battery terminal.

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

    5. Clear the DTCs stored in the memory Click here.

    6. Turn the power switch off.

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

    8. 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.


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


    1. A01NEPGE05
      Text in Illustration
      *1 Front Passenger Side Squib 2nd Step
      *2 Center Airbag Sensor Assembly
      *3

      Front view of wire harness connector

      (to Front Passenger Airbag Assembly)

      *4 Connector E
      *5 Color: Black

      Turn the power switch off.

    2. Disconnect the cable from the negative (-) battery terminal.

      Note

      Wait at least 90 seconds after disconnecting the cable from the negative (-) battery terminal to disable the SRS system.

    3. Disconnect SST from connector E.

    4. Disconnect the instrument panel wire from the center airbag sensor assembly.

    5. Check for a short to B+ in the circuit.


      1. Connect the cable to the negative (-) battery terminal.

      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
        f1-1 (P2-) - Body ground Power switch on (IG) Below 1 V
        f1-2 (P2+) - Body ground Power switch on (IG) Below 1 V
    6. Check for an open in the circuit.


      1. Turn the power switch off.

      2. Disconnect the cable from the negative (-) battery terminal.

        Note

        Wait at least 90 seconds after disconnecting the cable from the negative (-) battery terminal to disable the SRS system.

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

        Standard Resistance
        Tester Connection Condition Specified Condition
        f1-1 (P2-) - f1-2 (P2+) Always Below 1 Ω
    7. Check for a short to ground in the circuit.


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

        Standard Resistance
        Tester Connection Condition Specified Condition
        f1-1 (P2-) - Body ground Always 1 MΩ or higher
        f1-2 (P2+) - Body ground Always 1 MΩ or higher
    8. Check for a short in the circuit.


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

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

        Standard Resistance
        Tester Connection Condition Specified Condition
        f1-1 (P2-) - f1-2 (P2+) Always 1 MΩ or higher

    NG
    OK
  4. CHECK CENTER AIRBAG SENSOR ASSEMBLY


    1. A01NGU9E01
      Text in Illustration
      *1 Front Passenger Side Squib 2nd Step
      *2 Center Airbag Sensor Assembly

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

    2. Connect the connectors to the front passenger airbag assembly and center airbag sensor assembly.

    3. Connect the cable to the negative (-) battery terminal.

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

    5. Clear the DTCs stored in the memory Click here.

    6. Turn the power switch off.

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

    8. 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.


    NG
    OK
  5. CHECK INSTRUMENT PANEL WIRE


    1. A01NDHNE04
      Text in Illustration
      *1 Front Passenger Side Squib 2nd Step
      *2 Center Airbag Sensor Assembly
      *3 Instrument Panel Wire Assembly
      *4 Instrument Panel Wire
      *5

      Front view of wire harness connector

      (to Instrument Panel Wire Assembly)

      *6 Connector C

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

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

    3. Check for a short to B+ in the circuit.


      1. Connect the cable to the negative (-) battery terminal.

      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
        Ff1-3 (P2+) - Body ground Power switch on (IG) Below 1 V
        Ff1-4 (P2-) - Body ground Power switch on (IG) Below 1 V
    4. Check for an open in the circuit.


      1. Turn the power switch off.

      2. Disconnect the cable from the negative (-) battery terminal.

        Note

        Wait at least 90 seconds after disconnecting the cable from the negative (-) battery terminal to disable the SRS system.

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

        Standard Resistance
        Tester Connection Condition Specified Condition
        Ff1-3 (P2+) - Ff1-4 (P2-) Always Below 1 Ω
    5. Check for a short to ground in the circuit.


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

        Standard Resistance
        Tester Connection Condition Specified Condition
        Ff1-3 (P2+) - Body ground Always 1 MΩ or higher
        Ff1-4 (P2-) - Body ground Always 1 MΩ or higher
    6. Check for a short in the circuit.


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

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

        Standard Resistance
        Tester Connection Condition Specified Condition
        Ff1-3 (P2+) - Ff1-4 (P2-) Always 1 MΩ or higher

    NG
    OK
  6. CHECK INSTRUMENT PANEL WIRE ASSEMBLY


    1. A01NEAUE04
      Text in Illustration
      *1 Front Passenger Side Squib 2nd Step
      *2 Center Airbag Sensor Assembly
      *3 Instrument Panel Wire Assembly
      *4 Instrument Panel Wire
      *5

      Front view of wire harness connector

      (to Front Passenger Airbag Assembly)

      *6 Connector E
      *7 Color: Black

      Check for a short to B+ in the circuit.


      1. Connect the cable to the negative (-) battery terminal.

      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
        f1-1 (P2-) - Body ground Power switch on (IG) Below 1 V
        f1-2 (P2+) - Body ground Power switch on (IG) Below 1 V
    2. Check for an open in the circuit.


      1. Turn the power switch off.

      2. Disconnect the cable from the negative (-) battery terminal.

        Note

        Wait at least 90 seconds after disconnecting the cable from the negative (-) battery terminal to disable the SRS system.

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

        Standard Resistance
        Tester Connection Condition Specified Condition
        f1-1 (P2-) - f1-2 (P2+) Always Below 1 Ω
    3. Check for a short to ground in the circuit.


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

        Standard Resistance
        Tester Connection Condition Specified Condition
        f1-1 (P2-) - Body ground Always 1 MΩ or higher
        f1-2 (P2+) - Body ground Always 1 MΩ or higher
    4. Check for a short in the circuit.


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

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

        Standard Resistance
        Tester Connection Condition Specified Condition
        f1-1 (P2-) - f1-2 (P2+) Always 1 MΩ or higher

    NG
    OK