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AIRBAG SYSTEM, Diagnostic DTC:B1865/65, B1866/65, B1867/65, B1868/65

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DTC Code DTC Name
B1865/65 Short in Front Passenger Side Knee Airbag Squib Circuit
B1866/65 Open in Front Passenger Side Knee Airbag Squib Circuit
B1867/65 Short to GND in Front Passenger Side Knee Airbag Squib Circuit
B1868/65 Short to B+ in Front Passenger Side Knee Airbag Squib Circuit
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DESCRIPTION

The front passenger side knee airbag squib circuit consists of the airbag sensor assembly and lower No. 2 instrument panel 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 knee airbag squib circuit.

DTC No. DTC Detection Condition Trouble Area
B1865/65

  • The airbag sensor assembly receives a line short circuit signal in the front passenger side knee airbag squib circuit during primary check.

  • Front passenger side knee airbag squib malfunction

  • Airbag sensor assembly malfunction

  • Instrument panel wire

  • Lower No. 2 instrument panel airbag assembly (Front passenger side knee airbag squib)

  • Airbag sensor assembly
B1866/65

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

  • Front passenger side knee airbag squib malfunction

  • Airbag sensor assembly malfunction
B1867/65

  • The airbag sensor assembly receives a short circuit to ground signal in the front passenger side knee airbag squib circuit.

  • Front passenger side knee airbag squib malfunction

  • Airbag sensor assembly malfunction
B1868/65

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

  • Front passenger side knee airbag squib malfunction

  • Airbag sensor assembly malfunction
Table 1. *a Lower No. 2 Instrument Panel Airbag Assembly (Front Passenger Side Knee Airbag Squib) *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. A0003LSE02

      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 lower No. 2 instrument panel airbag assembly and airbag sensor assembly.

      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 lower No. 2 instrument panel airbag assembly and airbag sensor 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 connector (on the lower No. 2 instrument panel 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 spring for the instrument panel wire with the activation prevention mechanism are not deformed or damaged.

      OK
      The short spring is not deformed or damaged.
      Table 2. Text in Illustration
      *1 Lower No. 2 Instrument Panel Airbag Assembly
      *2 Airbag Sensor Assembly
      *3 Instrument Panel Wire

  2. Click here

    CHECK LOWER NO. 2 INSTRUMENT PANEL AIRBAG ASSEMBLY (FRONT PASSENGER SIDE KNEE AIRBAG SQUIB)


    1. A00078ME02

      Connect the connector to the airbag sensor assembly.

    2. Connect SST (resistance 2.1 Ω) to connector C.

      CAUTION:

      Never connect the tester to the lower No. 2 instrument panel airbag assembly (front passenger side knee airbag squib) 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 B1865/65, B1866/65, B1867/65 or B1868/65 is not output.
      Tip:

      Codes other than DTCs B1865/65, B1866/65, B1867/65 and B1868/65 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 C.

      Table 3. Text in Illustration
      *1 Lower No. 2 Instrument Panel Airbag Assembly
      *2 Airbag Sensor Assembly
      *a

      Front view of wire harness connector

      (to Lower No. 2 Instrument Panel Airbag Assembly)

  3. Click here

    CHECK INSTRUMENT PANEL WIRE


    1. A00068XE02

      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
        H59-1 (PK+) - Body ground Power switch on (IG) Below 1 V
        H59-2 (PK-) - 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
        H59-1 (PK+) - H59-2 (PK-) 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
        H59-1 (PK+) - Body ground Always 1 MΩ or higher
        H59-2 (PK-) - 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
        H59-1 (PK+) - H59-2 (PK-) 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 Lower No. 2 Instrument Panel Airbag Assembly
        *2 Airbag Sensor Assembly
        *3 Instrument Panel Wire
        *a

        Front view of wire harness connector

        (to Lower No. 2 Instrument Panel Airbag Assembly)

  4. Click here

    CHECK DTC


    1. A0007I9E03

      Connect the connectors to the lower No. 2 instrument panel 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 B1865/65, B1866/65, B1867/65 or B1868/65 is not output.
      Tip:

      Codes other than DTCs B1865/65, B1866/65, B1867/65 and B1868/65 may be output at this time, but they are not related to this check.

      Table 5. Text in Illustration
      *1 Lower No. 2 Instrument Panel Airbag Assembly
      *2 Airbag Sensor Assembly