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

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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
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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
Table 1. *a Instrument Panel Passenger Airbag Assembly (Front Passenger Side Squib 2nd Step) *b Airbag Sensor Assembly
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WIRING DIAGRAM

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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).

Tip:

  • Perform the simulation method by selecting check mode (Signal Check) using the GTS (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).

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PROCEDURE


  1. Click here

    CHECK CONNECTORS


    1. A0006M4E03

      Turn the power switch off.

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

      CAUTION:

      Wait at least 90 seconds after disconnecting the cable from the negative (-) auxiliary 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.
      Tip:

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

  2. Click here

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


    1. A0008IZE01

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

    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.

      09843-18061

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

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

      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 power switch off.

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

      CAUTION:

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

    10. Disconnect SST from connector E.

      Table 3. 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

  3. Click here

    CHECK FRONT PASSENGER SIDE SQUIB 2ND STEP CIRCUIT


    1. A0009DZE01

      Disconnect the instrument panel wire from the airbag sensor assembly.

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


      1. Connect the cable to the negative (-) auxiliary 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 Condition Specified Condition
        G1-2 (P2+) - Body ground Power switch on (IG) Below 1 V
        G1-1 (P2-) - 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.

        CAUTION:

        Wait at least 90 seconds after disconnecting the cable from the negative (-) auxiliary 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
        G1-2 (P2+) - G1-1 (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
        G1-2 (P2+) - Body ground Always 1 MΩ or higher
        G1-1 (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
        G1-2 (P2+) - G1-1 (P2-) Always 1 MΩ or higher

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

        Table 4. 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

  4. Click here

    CHECK DTC


    1. A0004ULE03

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

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

    3. Clear the DTCs stored in memory (Click here).

    4. Turn the power switch off.

    5. Turn the power switch on (IG), 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.
      Tip:

      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.

      Table 5. Text in Illustration
      *1 Instrument Panel Passenger Airbag Assembly
      *2 Airbag Sensor Assembly

  5. Click here

    CHECK INSTRUMENT PANEL WIRE


    1. A0008M1E01

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

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


      1. Connect the cable to the negative (-) auxiliary 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 Condition Specified Condition
        HG1-3 (P2+) - Body ground Power switch on (IG) Below 1 V
        HG1-4 (P2-) - 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.

        CAUTION:

        Wait at least 90 seconds after disconnecting the cable from the negative (-) auxiliary 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
        HG1-3 (P2+) - HG1-4 (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
        HG1-3 (P2+) - Body ground Always 1 MΩ or higher
        HG1-4 (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
        HG1-3 (P2+) - HG1-4 (P2-) Always 1 MΩ or higher

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

        Table 6. 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)

  6. Click here

    CHECK NO. 2 INSTRUMENT PANEL WIRE


    1. A0003PZE03

      Check for a short to B+ in the circuit.


      1. Connect the cable to the negative (-) auxiliary 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 Condition Specified Condition
        G1-2 (P2+) - Body ground Power switch on (IG) Below 1 V
        G1-1 (P2-) - 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.

        CAUTION:

        Wait at least 90 seconds after disconnecting the cable from the negative (-) auxiliary 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
        G1-2 (P2+) - G1-1 (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
        G1-2 (P2+) - Body ground Always 1 MΩ or higher
        G1-1 (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
        G1-2 (P2+) - G1-1 (P2-) Always 1 MΩ or higher

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

        Table 7. 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

    • OK

      USE SIMULATION METHOD TO CHECK (Click here)

    • NG

      REPLACE NO. 2 INSTRUMENT PANEL WIRE