AIRBAG SYSTEM, Diagnostic DTC:B1860/64, B1861/64, B1862/64, 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 center airbag sensor assembly and the driver side knee airbag assembly.

This circuit instructs SRS to deploy when deployment conditions are met.

These DTCs are stored when a malfunction is detected in the driver side knee airbag squib circuit.

DTC No. DTC Detection Condition Trouble Area
B1860/64

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

  • Driver side knee airbag squib malfunction

  • Center airbag sensor assembly malfunction

  • Instrument panel wire

  • Driver side knee airbag assembly (Driver side knee airbag squib)

  • Center airbag sensor assembly
B1861/64

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

  • Driver side knee airbag squib malfunction

  • Center airbag sensor assembly malfunction
B1862/64

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

  • Driver side knee airbag squib malfunction

  • Center airbag sensor assembly malfunction
B1863/64

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

  • Driver side knee airbag squib malfunction

  • Center airbag sensor assembly malfunction

WIRING DIAGRAM

A005HWSE02
*a Driver Side Knee Airbag Assembly (Driver Side Knee Airbag Squib)
*b Center Airbag Sensor Assembly

CAUTION / NOTICE / HINT

Tech Tips


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

PROCEDURE


  1. CHECK CONNECTORS


    1. 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. A005J4OE57
      Text in Illustration
      *1 Driver Side Knee Airbag Squib
      *2 Center Airbag Sensor Assembly
      *3 Instrument Panel Wire

      Check that the connectors are properly connected to the driver side knee airbag assembly and center airbag sensor assembly.

      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 driver side knee airbag assembly and center 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 driver side knee 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 is not deformed or damaged.

      OK
      The short spring is not deformed or damaged.

    NG

    REPLACE INSTRUMENT PANEL WIRE

    OK

  2. CHECK DRIVER SIDE KNEE AIRBAG ASSEMBLY (DRIVER SIDE KNEE AIRBAG SQUIB)

    SST
    09843-18061

    1. A005GL2E02
      Text in Illustration
      *1 Driver Side Knee Airbag Squib
      *2 Center Airbag Sensor Assembly
      *3 Connector C
      *a

      Front view of wire harness connector

      (to Driver Side Knee Airbag Assembly)

      Connect the connector to the center airbag sensor assembly.

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

      CAUTION:

      Never connect the tester to the driver side knee 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.

      • Insert SST straight into the terminals of the connector.

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

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

    5. Clear the DTCs stored in the memory Click here.

    6. Turn the ignition switch off.

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

    8. Check for DTCs Click here.

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

      Tech Tips

      Codes other than DTCs B1860, B1861, B1862, B1863 and 64 may be output at this time, but they are not related to this check.


    OK

    REPLACE DRIVER SIDE KNEE AIRBAG ASSEMBLY Click here

    NG

  3. CHECK INSTRUMENT PANEL WIRE (DRIVER SIDE KNEE AIRBAG SQUIB CIRCUIT)


    1. 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. Disconnect SST from connector C.

      A005H4WE02
      Text in Illustration
      *1 Driver Side Knee Airbag Squib *2 Center Airbag Sensor Assembly
      *3 Instrument Panel Wire *4 Connector C
      *a

      Front view of wire harness connector

      (to Driver Side Knee Airbag Assembly)

      		 - -

    4. Disconnect the instrument panel wire from the center airbag sensor assembly.

    5. 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 Switch Condition Specified Condition
        F19-1 (DK+) - Body ground Ignition switch ON Below 1 V
        F19-2 (DK-) - Body ground Ignition switch ON Below 1 V

    6. Check for an open in the circuit.


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

        Standard Resistance
        Tester Connection Condition Specified Condition
        F19-1 (DK+) - F19-2 (DK-) Always Below 1 Ω

    7. 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
        F19-1 (DK+) - Body ground Always 1 MΩ or higher
        F19-2 (DK-) - Body ground Always 1 MΩ or higher

    8. 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
        F19-1 (DK+) - F19-2 (DK-) Always 1 MΩ or higher

    NG

    REPLACE INSTRUMENT PANEL WIRE

    OK

  4. CHECK CENTER AIRBAG SENSOR ASSEMBLY


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

    2. Connect the connectors to the driver side knee airbag assembly and center airbag sensor assembly.

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

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

    5. Clear the stored DTCs in the memory Click here.

    6. Turn the ignition switch off.

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

    8. Check for DTCs Click here.

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

      Tech Tips

      Codes other than DTCs B1860, B1861, B1862, B1863 and 64 may be output at this time, but they are not related to this check.


    OK

    USE SIMULATION METHOD TO CHECK Click here

    NG

    REPLACE CENTER AIRBAG SENSOR ASSEMBLY Click here