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 lower No. 1 instrument panel airbag assembly.

This circuit instructs the 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 Code DTC Detection Condition Trouble Area
B1860/64

One of the following conditions is met:


  • The center airbag sensor assembly receives a line short circuit signal 5 times in the driver side knee airbag squib circuit during the primary check.

  • A driver side knee airbag squib malfunction.

  • A center airbag sensor assembly malfunction.

  • Instrument panel wire

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

  • Center airbag sensor assembly
B1861/64

One of the following conditions is met:


  • The center airbag sensor assembly receives an open circuit signal in the driver side knee airbag squib circuit for 2 seconds.

  • A driver side knee airbag squib malfunction.

  • A center airbag sensor assembly malfunction.
B1862/64

One of the following conditions is met:


  • The center airbag sensor assembly receives a short circuit to ground signal in the knee airbag (driver side squib) circuit for 0.5 seconds.

  • A driver side knee airbag squib malfunction.

  • A center airbag sensor assembly malfunction.
B1863/64

One of the following conditions is met:


  • The center airbag sensor assembly receives a short circuit to B+ signal in the knee airbag (driver side squib) circuit for 0.5 seconds.

  • A driver side knee airbag squib malfunction.

  • A center airbag sensor assembly malfunction.

WIRING DIAGRAM

A004NHRE03
*a Lower No. 1 Instrument Panel Airbag Assembly
*b Center Airbag Sensor Assembly

CAUTION / NOTICE / HINT

Note


  • After turning the ignition switch off, waiting time may be required before disconnecting the cable from the battery terminal. Therefore, make sure to read the disconnecting the cable from the battery terminal notice before proceeding with work Click here.

  • When disconnecting the cable from the negative (-) battery terminal while performing repairs, some systems need to be initialized after the cable is reconnected Click here.

Tech Tips

To perform the simulation method, enter check mode (signal check) with the intelligent tester (See page ), and then wiggle each connector of the airbag system or drive the vehicle on various types of roads Click here.

PROCEDURE


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


    1. A004MLBE02
      Text in Illustration
      *1 Lower No. 1 Instrument Panel Airbag Assembly
      *2 Center Airbag Sensor Assembly
      *3 Connector C
      *4 SST
      *a

      Front view of wire harness connector

      (to Lower No. 1 Instrument Panel Airbag Assembly)

      Turn the ignition switch off.

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

    3. Disconnect the connector from the lower No. 1 instrument panel airbag assembly.

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

      CAUTION:

      Never connect the tester to the lower No. 1 instrument panel airbag assembly (driver side knee 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 SST.

      • Insert SST straight into the terminals of the connector.

      SST
      09843-18061

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

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

    7. Clear the DTCs Click here.

    8. Turn the ignition switch off.

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

    10. Check for DTCs Click here.

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

      Tech Tips

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


    OK

    REPLACE LOWER NO. 1 INSTRUMENT PANEL AIRBAG ASSEMBLY Click here

    NG

  2. CHECK CONNECTORS


    1. A004QE8E01
      Text in Illustration
      *1 Lower No. 1 Instrument Panel Airbag Assembly
      *2 Center Airbag Sensor Assembly

      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 instrument panel wire connector (on the lower No. 1 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.

    NG

    REPLACE INSTRUMENT PANEL WIRE

    OK

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


    1. A004SHBE02
      Text in Illustration
      *1 Lower No. 1 Instrument Panel Airbag Assembly
      *2 Instrument Panel Wire
      *3 Center Airbag Sensor Assembly
      *4 Connector C
      *a

      Front view of wire harness connector

      (to Lower No. 1 Instrument Panel Airbag Assembly)

      Disconnect the connector from the center airbag sensor assembly.

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

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      D120-1 (DK+) - Body ground Ignition switch ON Below 1 V
      D120-2 (DK-) - Body ground Ignition switch ON Below 1 V

    4. Turn the ignition switch off.

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

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      D120-1 (DK+) - D120-2 (DK-) Always Below 1 Ω

    7. Release the activation prevention mechanism built into connector B Click here.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      D120-1 (DK+) - D120-2 (DK-) Always 1 MΩ or higher
      D120-1 (DK+) - Body ground Always 1 MΩ or higher
      D120-2 (DK-) - Body ground Always 1 MΩ or higher

    NG

    REPLACE INSTRUMENT PANEL WIRE

    OK

  4. CHECK CENTER AIRBAG SENSOR ASSEMBLY


    1. A004P48E01
      Text in Illustration
      *1 Lower No. 1 Instrument Panel Airbag Assembly
      *2 Center Airbag Sensor Assembly

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

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

    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.

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

      Tech Tips

      Codes other than DTC B1860/64, B1861/64, B1862/64 and B1863/64 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