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 airbag sensor assembly and instrument panel passenger airbag assembly.

The airbag sensor assembly uses this circuit to deploy the airbag when deployment conditions are met.

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

DTC No. DTC Detection Condition Trouble Area
B1815/54

  • The 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

  • Airbag sensor assembly malfunction

  • Instrument panel wire

  • No. 2 instrument panel wire

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

  • Airbag sensor assembly
B1816/54

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

  • Front passenger side squib 2nd step malfunction

  • Airbag sensor assembly malfunction
B1817/54

  • The 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

  • Airbag sensor assembly malfunction
B1818/54

  • The 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

  • Airbag sensor assembly malfunction

WIRING DIAGRAM

A011SXPE19

INSPECTION PROCEDURE

Note

After turning the ignition 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.

Tech Tips

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

PROCEDURE

  1. CHECK CONNECTORS

    1. Turn the ignition switch off.

      A011STHE01

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

      CAUTION:

      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 instrument panel passenger airbag assembly and airbag sensor assembly. Also check that the connectors that link the instrument panel wire and No. 2 instrument panel wire 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 instrument panel passenger airbag assembly and airbag sensor assembly. Also disconnect the instrument panel wire from the No. 2 instrument panel wire.

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

      OK
      The terminals are not deformed or damaged.

    6. Check that the No. 2 instrument panel wire connector (on the instrument panel passenger airbag assembly side) is not damaged.

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

    7. Check that the short springs for the instrument panel wire and No. 2 instrument panel wire with the activation prevention mechanism are not deformed or damaged.

      OK
      The short springs are not deformed or damaged.
      Text in Illustration
      *1 Instrument Panel Passenger Airbag Assembly
      *2 Airbag Sensor Assembly
      *3 No. 2 Instrument Panel Wire
      *4 Instrument Panel Wire
    NG

    REPLACE WIRE HARNESS

    OK

  2. CHECK INSTRUMENT PANEL PASSENGER AIRBAG ASSEMBLY (FRONT PASSENGER SIDE SQUIB 2ND STEP)

    1. Connect the instrument panel wire to the No. 2 instrument panel wire and airbag sensor assembly.

      A011R3HE06

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

      CAUTION:

      Never connect the tester to the instrument panel 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 it.

      • Insert SST straight into the terminals of the connector.

      SST
      09843-18061

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

    4. Clear the DTCs stored in memory 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 B1815/54, B1816/54, B1817/54 or B1818/54 is not output.

      Tech Tips

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

    8. Turn the ignition switch off.

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

      CAUTION:

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

    10. Disconnect SST from connector E.

      Text in Illustration
      *1 Instrument Panel Passenger Airbag Assembly
      *2 Airbag Sensor Assembly
      *a

      Front view of wire harness connector

      (to Instrument Panel Passenger Airbag Assembly)
      *b Color: Black
    NG

    CHECK FRONT PASSENGER SIDE SQUIB 2ND STEP CIRCUIT Click here

    OK

    REPLACE INSTRUMENT PANEL PASSENGER AIRBAG ASSEMBLY Click here

  3. CHECK FRONT PASSENGER SIDE SQUIB 2ND STEP CIRCUIT

    1. Disconnect the instrument panel wire from the airbag sensor assembly.

      A011S9TE05

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

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

      2. Turn the ignition switch to ON.

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

        Standard Voltage
        Tester Connection Condition Specified Condition
        b2-2 (P2+) - Body ground Ignition switch ON Below 1 V
        b2-1 (P2-) - Body ground Ignition switch ON Below 1 V

      4. Turn the ignition switch off.

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

        CAUTION:

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

    3. Check for an open in the circuit.

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

        Standard Resistance
        Tester Connection Condition Specified Condition
        b2-2 (P2+) - b2-1 (P2-) Always Below 1 Ω

    4. 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
        b2-2 (P2+) - Body ground Always 1 MΩ or higher
        b2-1 (P2-) - Body ground Always 1 MΩ or higher

    5. 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
        b2-2 (P2+) - b2-1 (P2-) Always 1 MΩ or higher

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

        Text in Illustration
        *1 Instrument Panel Passenger Airbag Assembly
        *2 Airbag Sensor Assembly
        *a

        Front view of wire harness connector

        (to Instrument Panel Passenger Airbag Assembly)
        *b Color: Black
    NG

    CHECK INSTRUMENT PANEL WIRE Click here

    OK

  4. CHECK DTC

    1. Connect the connectors to the instrument panel passenger airbag assembly and airbag sensor assembly.

      A011S0WE01

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

    3. Clear the DTCs stored in memory Click here.

    4. Turn the ignition switch off.

    5. Turn the ignition switch to ON, and wait for at least 60 seconds.

    6. Check for DTCs Click here.

      OK
      DTC B1815/54, B1816/54, B1817/54 or B1818/54 is not output.

      Tech Tips

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

      Text in Illustration
      *1 Instrument Panel Passenger Airbag Assembly
      *2 Airbag Sensor Assembly
    NG

    REPLACE AIRBAG SENSOR ASSEMBLY Click here

    OK

    USE SIMULATION METHOD TO CHECK Click here

  5. CHECK INSTRUMENT PANEL WIRE

    1. Disconnect the No. 2 instrument panel wire from the instrument panel wire.

      A011RQEE04

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

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

      2. Turn the ignition switch to ON.

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

        Standard Voltage
        Tester Connection Condition Specified Condition
        lb2-3 (P2+) - Body ground Ignition switch ON Below 1 V
        lb2-4 (P2-) - Body ground Ignition switch ON Below 1 V

      4. Turn the ignition switch off.

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

        CAUTION:

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

    3. Check for an open in the circuit.

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

        Standard Resistance
        Tester Connection Condition Specified Condition
        lb2-3 (P2+) - lb2-4 (P2-) Always Below 1 Ω

    4. 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
        lb2-3 (P2+) - Body ground Always 1 MΩ or higher
        lb2-4 (P2-) - Body ground Always 1 MΩ or higher

    5. 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
        lb2-3 (P2+) - lb2-4 (P2-) Always 1 MΩ or higher

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

        Text in Illustration
        *1 Instrument Panel Passenger Airbag Assembly
        *2 Airbag Sensor Assembly
        *3 No. 2 Instrument Panel Wire
        *4 Instrument Panel Wire
        *a

        Front view of wire harness connector

        (to No. 2 Instrument Panel Wire)
    NG

    REPLACE INSTRUMENT PANEL WIRE

    OK

  6. CHECK NO. 2 INSTRUMENT PANEL WIRE

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

      A011QMDE05

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

      2. Turn the ignition switch to ON.

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

        Standard Voltage
        Tester Connection Condition Specified Condition
        b2-2 (P2+) - Body ground Ignition switch ON Below 1 V
        b2-1 (P2-) - Body ground Ignition switch ON Below 1 V

      4. Turn the ignition switch off.

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

        CAUTION:

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

    2. Check for an open in the circuit.

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

        Standard Resistance
        Tester Connection Condition Specified Condition
        b2-2 (P2+) - b2-1 (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
        b2-2 (P2+) - Body ground Always 1 MΩ or higher
        b2-1 (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
        b2-2 (P2+) - b2-1 (P2-) Always 1 MΩ or higher

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

        Text in Illustration
        *1 Instrument Panel Passenger Airbag Assembly
        *2 Airbag Sensor Assembly
        *3 No. 2 Instrument Panel Wire
        *4 Instrument Panel Wire
        *a

        Front view of wire harness connector

        (to Instrument Panel Passenger Airbag Assembly)
        *b Color: Black
    NG

    REPLACE NO. 2 INSTRUMENT PANEL WIRE

    OK

    USE SIMULATION METHOD TO CHECK Click here