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 knee airbag squib circuit consists of the center airbag sensor assembly and the knee airbag assembly.

This circuit signals the SRS to deploy when deployment conditions are met.

These DTCs are recorded when a malfunction is detected in the knee airbag squib circuit.

DTC No. DTC Detection Condition Trouble Area
B1860/64

  • Center airbag sensor assembly detects line short circuit signal 5 times in knee airbag squib circuit during primary check.

  • Knee airbag squib malfunction

  • Center airbag sensor assembly malfunction

  • Instrument panel wire

  • Knee airbag assembly (Knee airbag squib)

  • Center airbag sensor assembly
B1861/64

  • Center airbag sensor assembly detects open circuit signal in knee airbag squib circuit for 2 seconds.

  • Knee airbag squib malfunction

  • Center airbag sensor assembly malfunction

  • Instrument panel wire

  • Knee airbag assembly (Knee airbag squib)

  • Center airbag sensor assembly
B1862/64

  • Center airbag sensor assembly detects short circuit to ground signal in knee airbag squib circuit for 0.5 seconds.

  • Knee airbag squib malfunction

  • Center airbag sensor assembly malfunction

  • Instrument panel wire

  • Knee airbag assembly (Knee airbag squib)

  • Center airbag sensor assembly
B1863/64

  • Center airbag sensor assembly detects short circuit to B+ signal in knee airbag squib circuit for 0.5 seconds.

  • Knee airbag squib malfunction

  • Center airbag sensor assembly malfunction

  • Instrument panel wire

  • Knee airbag assembly (Knee airbag squib)

  • Center airbag sensor assembly

WIRING DIAGRAM

A0118JXE33

INSPECTION PROCEDURE

Tech Tips


  • Perform the simulation method by selecting CHECK MODE (signal check) with 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 CONNECTOR


    1. Turn the ignition switch off.

    2. Disconnect the cable from the negative (-) battery terminal, and wait for at least 90 seconds.

    3. Check that the connector is properly connected to the knee airbag assembly.

      OK
      The connector is properly connected.

      Tech Tips

      If the connector is not connected securely, reconnect the connector and proceed to the next inspection.

    4. Disconnect the connector from the knee airbag assembly.

    5. Check that the instrument panel wire connector (on the 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.

    NG

    REPLACE INSTRUMENT PANEL WIRE

    OK

  2. CHECK KNEE AIRBAG ASSEMBLY (KNEE AIRBAG SQUIB)

    SST
    09843-18061

    1. A011A4SE01
      Text in Illustration
      *1 Knee Airbag Squib
      *2 Center Airbag Sensor Assembly
      *3

      Front view of wire harness connector

      (to Knee Airbag Squib)
      *4 Connector C

      Connect the white wire side of SST (resistance 2.1 Ω) to connector C.

      CAUTION:

      Never connect a tester to the knee airbag assembly (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.

    2. Connect the negative (-) terminal cable to the battery, and wait for at least 2 seconds.

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

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

    5. Turn the ignition switch off.

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

    7. Check the DTCs Click here.

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

      Tech Tips

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


    NG

    CHECK CONNECTOR Click here

    OK

    REPLACE KNEE AIRBAG ASSEMBLY Click here

  3. CHECK CONNECTOR


    1. Turn the ignition switch off.

    2. Disconnect the cable from the negative (-) battery terminal, and wait for at least 90 seconds.

    3. Disconnect SST from connector C.

    4. Check that the connector is properly connected to the center airbag sensor assembly.

      OK
      The connector is properly connected.

      Tech Tips

      If the connector is not connected securely, reconnect the connector and proceed to the next inspection.

    5. Disconnect the connector from the center airbag sensor assembly.

    6. Check that the terminal of the connector is not damaged.

      OK
      The terminal is not deformed or damaged.

    7. Check that the short spring for the instrument panel wire connector 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

  4. CHECK INSTRUMENT PANEL WIRE (KNEE AIRBAG SQUIB - CENTER AIRBAG SENSOR ASSEMBLY)


    1. A0118RIE01
      Text in Illustration
      *1 Knee Airbag Squib
      *2 Instrument Panel Wire
      *3 Center Airbag Sensor Assembly
      *4

      Front view of wire harness connector

      (to Knee Airbag Squib)
      *5 Connector C

      Disconnect the connectors from the center airbag sensor assembly.

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


      1. Connect the negative (-) terminal cable to the battery, and wait for at least 2 seconds.

      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

        D46-1 (DK+) -

        Body ground

        		 Ignition switch ON Below 1 V

        D46-2 (DK-) -

        Body ground

        		 Ignition switch ON Below 1 V

    3. Check for open in the circuit.


      1. Turn the ignition switch off.

      2. Disconnect the negative (-) terminal cable from the battery, and wait for at least 90 seconds.

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

        Standard Resistance
        Tester Connection Condition Specified Condition

        D46-1 (DK+) -

        D46-2 (DK-)

        		 Always Below 1 Ω

    4. Check for 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

        D46-1 (DK+) -

        Body ground

        		 Always 1 MΩ or higher

        D46-2 (DK-) -

        Body ground

        		 Always 1 MΩ or higher

    5. Check for 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

        D46-1 (DK+) -

        D46-2 (DK-)

        		 Always 1 MΩ or higher

    NG

    REPLACE INSTRUMENT PANEL WIRE

    OK

  5. CHECK CENTER AIRBAG SENSOR ASSEMBLY


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

    2. A011B1TE01
      Text in Illustration
      *1 Knee Airbag Squib
      *2 Center Airbag Sensor Assembly

      Connect the connectors to the knee airbag assembly and the center airbag sensor assembly.

    3. Connect the negative (-) terminal cable to the battery, and wait for at least 2 seconds.

    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 the DTCs Click here.

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

      Tech Tips

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


    NG

    REPLACE CENTER AIRBAG SENSOR ASSEMBLY Click here

    OK

    USE SIMULATION METHOD TO CHECK Click here