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. Detection Item DTC Detection Condition Trouble Area Test Mode / Check Mode
B1815/54 Short in Front Passenger Side Squib 2nd Step Circuit

  • The airbag sensor assembly detects a line short 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

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

  • Airbag sensor assembly

 Applies to check mode
B1816/54 Open in Front Passenger Side Squib 2nd Step Circuit

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

  • Front passenger side squib 2nd step malfunction

  • Airbag sensor assembly malfunction

  • Instrument panel wire

  • No. 2 instrument panel wire

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

  • Airbag sensor assembly

 Applies to check mode
B1817/54 Short to GND in Front Passenger Side Squib 2nd Step Circuit

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

  • Front passenger side squib 2nd step malfunction

  • Airbag sensor assembly malfunction

  • Instrument panel wire

  • No. 2 instrument panel wire

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

  • Airbag sensor assembly

 Applies to check mode
B1818/54 Short to B+ in Front Passenger Side Squib 2nd Step Circuit

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

  • Front passenger side squib 2nd step malfunction

  • Airbag sensor assembly malfunction

  • Instrument panel wire

  • No. 2 instrument panel wire

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

  • Airbag sensor assembly

 Applies to check mode

WIRING DIAGRAM

A0022XLE49
*a Front Passenger Side Squib 2nd Step (Instrument Panel Passenger Airbag Assembly)
*b Airbag Sensor Assembly

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

Tech Tips


  • 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

PROCEDURE


  1. CHECK CONNECTORS


    1. A00226KC01
      *1 Instrument Panel Passenger Airbag Assembly
      *2 Airbag Sensor Assembly
      *3 No. 2 Instrument Panel Wire
      *4 Instrument Panel Wire

      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.

      Tech Tips

      If the connectors are not properly connected, 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 connector locking 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.
      Result
      Proceed to
      OK
      NG

    NG

    REPLACE WIRE HARNESS

    OK

  2. CHECK INSTRUMENT PANEL PASSENGER AIRBAG ASSEMBLY


    1. A0021VAC02
      *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

      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 a tester to the instrument panel passenger airbag assembly 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 (-) auxiliary battery terminal.

    4. Clear the DTCs stored in memory.

      Click here


      Body Electrical > SRS Airbag > Clear DTCs

    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


      Body Electrical > SRS Airbag > Trouble Codes
      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 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.

      Result
      Proceed to
      OK
      NG

    OK

    REPLACE INSTRUMENT PANEL PASSENGER AIRBAG ASSEMBLY Click here

    NG

  3. CHECK FRONT PASSENGER SIDE SQUIB 2ND STEP CIRCUIT


    1. A00217KC02
      *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

      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
        Y1-2 (P2+) - Body ground Power switch on (IG) Below 1 V
        Y1-1 (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
        Y1-2 (P2+) - Y1-1 (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
        Y1-2 (P2+) - Body ground Always 1 MΩ or higher
        Y1-1 (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
        Y1-2 (P2+) - Y1-1 (P2-) Always 1 MΩ or higher

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

      Result
      Proceed to
      OK
      NG

    NG

    CHECK INSTRUMENT PANEL WIRE Click here

    OK

  4. CHECK DTC


    1. A002315C07
      *1 Instrument Panel Passenger Airbag Assembly
      *2 Airbag Sensor Assembly

      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


      Body Electrical > SRS Airbag > Clear DTCs

    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


      Body Electrical > SRS Airbag > Trouble Codes
      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.

      Result
      Proceed to
      OK
      NG

    OK

    USE SIMULATION METHOD TO CHECK Click here

    NG

    REPLACE AIRBAG SENSOR ASSEMBLY Click here

  5. CHECK INSTRUMENT PANEL WIRE


    1. A00209CC04
      *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)

      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
        KY1-3 (P2+) - Body ground Power switch on (IG) Below 1 V
        KY1-4 (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
        KY1-3 (P2+) - KY1-4 (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
        KY1-3 (P2+) - Body ground Always 1 MΩ or higher
        KY1-4 (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
        KY1-3 (P2+) - KY1-4 (P2-) Always 1 MΩ or higher

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

      Result
      Proceed to
      OK
      NG

    NG

    REPLACE INSTRUMENT PANEL WIRE

    OK

  6. CHECK NO. 2 INSTRUMENT PANEL WIRE


    1. A00219YC02
      *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

      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
        Y1-2 (P2+) - Body ground Power switch on (IG) Below 1 V
        Y1-1 (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
        Y1-2 (P2+) - Y1-1 (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
        Y1-2 (P2+) - Body ground Always 1 MΩ or higher
        Y1-1 (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
        Y1-2 (P2+) - Y1-1 (P2-) Always 1 MΩ or higher

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

      Result
      Proceed to
      OK
      NG

    OK

    USE SIMULATION METHOD TO CHECK Click here

    NG

    REPLACE NO. 2 INSTRUMENT PANEL WIRE