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 driver side knee airbag assembly.

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

These DTCs are recorded 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

  • Instrument panel wire

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

  • Center airbag sensor assembly
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

  • Instrument panel wire

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

  • Center airbag sensor assembly
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

  • Instrument panel wire

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

  • Center airbag sensor assembly

WIRING DIAGRAM

A01NCZ5E18

INSPECTION PROCEDURE

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. A01NEFAE01
      Text in Illustration
      *1 Driver Side Knee Airbag Squib
      *2 Center Airbag Sensor Assembly
      *3 Instrument Panel Wire

      Turn the power switch off.

    2. Disconnect the cable from the negative (-) battery terminal.

      Note

      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 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 are 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)


    1. A01ND89E06
      Text in Illustration
      *1 Driver Side Knee Airbag Squib
      *2 Center Airbag Sensor Assembly
      *3

      Front view of wire harness connector

      (to Driver Side Knee Airbag Assembly)
      *4 Connector C
      *5 for LHD
      *6 for RHD

      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.

      SST
      09843-18061

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

    4. Turn the power switch on (IG), and wait for at least 60 seconds.

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

    6. Turn the power switch off.

    7. Turn the power switch on (IG), 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 DTC B1860, B1861, B1862, B1863 and 64 may be output at this time, but they are not related to this check.


    NG

    CHECK INSTRUMENT PANEL WIRE (DRIVER SIDE KNEE AIRBAG SQUIB CIRCUIT) Click here

    OK

    REPLACE DRIVER SIDE KNEE AIRBAG ASSEMBLY Click here

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


    1. A01NG23E06
      Text in Illustration
      *1 Driver Side Knee Airbag Squib
      *2 Center Airbag Sensor Assembly
      *3 Instrument Panel Wire
      *4

      Front view of wire harness connector

      (to Driver Side Knee Airbag Assembly)
      *5 Connector C
      *6 for LHD
      *7 for RHD

      Turn the power switch off.

    2. Disconnect the cable from the negative (-) battery terminal.

      Note

      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.

    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 power switch on (IG).

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

        Standard Voltage
        for LHD
        Tester Connection Switch Condition Specified Condition
        F88-1 (DK+) - Body ground Power switch on (IG) Below 1 V
        F88-2 (DK-) - Body ground Power switch on (IG) Below 1 V
        for RHD
        Tester Connection Switch Condition Specified Condition
        F89-1 (DK+) - Body ground Power switch on (IG) Below 1 V
        F89-2 (DK-) - Body ground Power switch on (IG) Below 1 V

    6. Check for an open in the circuit.


      1. Turn the power switch off.

      2. Disconnect the cable from the negative (-) battery terminal.

        Note

        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
        for LHD
        Tester Connection Condition Specified Condition
        F88-1 (DK+) - F88-2 (DK-) Always Below 1 Ω
        for RHD
        Tester Connection Condition Specified Condition
        F89-1 (DK+) - F89-2 (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
        for LHD
        Tester Connection Condition Specified Condition
        F88-1 (DK+) - Body ground Always 1 MΩ or higher
        F88-2 (DK-) - Body ground Always 1 MΩ or higher
        for RHD
        Tester Connection Condition Specified Condition
        F89-1 (DK+) - Body ground Always 1 MΩ or higher
        F89-2 (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
        for LHD
        Tester Connection Condition Specified Condition
        F88-1 (DK+) - F88-2 (DK-) Always 1 MΩ or higher
        for RHD
        Tester Connection Condition Specified Condition
        F89-1 (DK+) - F89-2 (DK-) Always 1 MΩ or higher

    NG

    REPLACE INSTRUMENT PANEL WIRE

    OK

  4. CHECK CENTER AIRBAG SENSOR ASSEMBLY


    1. A01NGWEE01
      Text in Illustration
      *1 Driver Side Knee Airbag Squib
      *2 Center Airbag Sensor Assembly

      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 power switch on (IG), and wait for at least 60 seconds.

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

    6. Turn the power switch off.

    7. Turn the power switch on (IG), 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 DTC 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