AIRBAG SYSTEM, Diagnostic DTC:B1860/64,B1861/64,B1862/64 and B1863/64

DTC Code DTC Name
B1860/64 Short in Driver Side Knee Airbag Squib Circuit
B1861/64 Open in Driver Side Knee Airbag Squib Circuit
B1862/64 Short to GND in Driver Side Knee Airbag Squib Circuit
B1863/64 Short to B+ in Driver Side Knee Airbag Squib Circuit

DESCRIPTION

The driver side knee airbag squib circuit consists of the airbag sensor assembly and lower No. 1 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 driver side knee airbag squib circuit.

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

Test Mode / Check Mode

B1860/64

Short in Driver Side Knee Airbag Squib Circuit

  • The airbag sensor assembly detects a line short in the driver side knee airbag squib during primary check.

  • Driver side knee airbag squib malfunction

  • Airbag sensor assembly malfunction

  • Instrument panel wire

  • Lower No. 1 instrument panel airbag assembly (Driver side knee airbag squib)

  • Airbag sensor assembly

Applies to check mode

B1861/64

Open in Driver Side Knee Airbag Squib Circuit

  • The airbag sensor assembly detects an open in the driver side knee airbag squib.

  • Driver side knee airbag squib malfunction

  • Airbag sensor assembly malfunction

  • Instrument panel wire

  • Lower No. 1 instrument panel airbag assembly (Driver side knee airbag squib)

  • Airbag sensor assembly

Applies to check mode

B1862/64

Short to GND in Driver Side Knee Airbag Squib Circuit

  • The airbag sensor assembly detects a short to ground in the driver side knee airbag squib.

  • Driver side knee airbag squib malfunction

  • Airbag sensor assembly malfunction

  • Instrument panel wire

  • Lower No. 1 instrument panel airbag assembly (Driver side knee airbag squib)

  • Airbag sensor assembly

Applies to check mode

B1863/64

Short to B+ in Driver Side Knee Airbag Squib Circuit

  • The airbag sensor assembly detects a short to B+ in the driver side knee airbag squib.

  • Driver side knee airbag squib malfunction

  • Airbag sensor assembly malfunction

  • Instrument panel wire

  • Lower No. 1 instrument panel airbag assembly (Driver side knee airbag squib)

  • Airbag sensor assembly

Applies to check mode

WIRING DIAGRAM

C249389E40

CAUTION / NOTICE / HINT

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 hereClick hereClick here

Tip:

PROCEDURE

  1. CHECK CONNECTORS

    1. C238350C01

      *1

      Lower No. 1 Instrument Panel Airbag Assembly

      *2

      Airbag Sensor Assembly

      *3

      Instrument Panel Wire

      Turn the ignition switch off.

    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 lower No. 1 instrument panel airbag assembly and airbag sensor assembly.

      OK

      The connectors are properly connected.

      Tip:

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

    4. Disconnect the connectors from the lower No. 1 instrument panel airbag assembly and airbag sensor assembly.

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

      OK

      The terminals are not deformed or damaged.

    6. Check that the instrument panel wire connector (on the lower No. 1 instrument panel airbag assembly side) is not damaged.

      OK

      The connector locking 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 is not deformed or damaged.

      OK

      The short spring is not deformed or damaged.

    Result

    Proceed to

    OK

    NG
    NG

    REPLACE INSTRUMENT PANEL WIRE

    OK

  2. CHECK LOWER NO. 1 INSTRUMENT PANEL AIRBAG ASSEMBLY (DRIVER SIDE KNEE AIRBAG SQUIB)

    1. C241757C01

      *1

      Lower No. 1 Instrument Panel Airbag Assembly

      *2

      Airbag Sensor Assembly

      *a

      Front view of wire harness connector

      (to Lower No. 1 Instrument Panel Airbag Assembly)

      Connect the connector to the airbag sensor assembly.

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

      CAUTION:

      Never connect a tester to the lower No. 1 instrument panel airbag assembly (driver 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.

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

    4. Clear the DTCs stored in memory.

      Click here

      Body Electrical > SRS Airbag > Clear DTCs

    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

      Body Electrical > SRS Airbag > Trouble Codes

      OK

      DTC B1860/64, B1861/64, B1862/64 or B1863/64 is not output.

      Tip:

      Codes other than DTCs B1860/64, B1861/64, B1862/64 and B1863/64 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 C.

    09843-18061

    Result

    Proceed to

    OK

    NG
    OK

    REPLACE LOWER NO. 1 INSTRUMENT PANEL AIRBAG ASSEMBLY

    for Sedan:Click hereClick here

    for Hatchback, Wagon:Click here

    NG

  3. CHECK INSTRUMENT PANEL WIRE

    1. C241758C01

      *1

      Lower No. 1 Instrument Panel Airbag Assembly

      *2

      Airbag Sensor Assembly

      *3

      Instrument Panel Wire

      *a

      Front view of wire harness connector

      (to Lower No. 1 Instrument Panel Airbag Assembly)

      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 (-) 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

        E88-1 (DK+) - Body ground

        Ignition switch ON

        Below 1 V

        E88-2 (DK-) - 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

        E88-1 (DK+) - E88-2 (DK-)

        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

        E88-1 (DK+) - Body ground

        Always

        1 MΩ or higher

        E88-2 (DK-) - 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 hereClick hereClick here

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

        Standard Resistance

        Tester Connection

        Condition

        Specified Condition

        E88-1 (DK+) - E88-2 (DK-)

        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

  4. CHECK DTC

    1. C238353C01

      *1

      Lower No. 1 Instrument Panel Airbag Assembly

      *2

      Airbag Sensor Assembly

      Connect the connectors to the lower No. 1 instrument panel airbag assembly and airbag sensor assembly.

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

    3. Clear the DTCs stored in memory.

      Click here

      Body Electrical > SRS Airbag > Clear DTCs

    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

      Body Electrical > SRS Airbag > Trouble Codes

      OK

      DTC B1860/64, B1861/64, B1862/64 or B1863/64 is not output.

      Tip:

      Codes other than DTCs B1860/64, B1861/64, B1862/64 and B1863/64 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 hereClick hereClick hereClick hereClick hereClick here

    NG

    REPLACE AIRBAG SENSOR ASSEMBLY

    Click here