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 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 squib circuit.

DTC Code DTC Detection Condition Trouble Area
B1860/64

One of the following conditions is met:


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

  • A driver side knee 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 detects an open circuit signal in the driver side knee squib circuit for 2 seconds.

  • A driver side knee squib malfunction.

  • A center airbag sensor assembly malfunction.
B1862/64

One of the following conditions is met:


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

  • A driver side knee squib malfunction.

  • A center airbag sensor assembly malfunction.
B1863/64

One of the following conditions is met:


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

  • A driver side knee squib malfunction.

  • A center airbag sensor assembly malfunction.

WIRING DIAGRAM

A000T6SE05
*a Lower No. 1 Instrument Panel Airbag Assembly (Driver Side Knee Squib)
*b Center Airbag Sensor Assembly

CAUTION / NOTICE / HINT

Note


  • After turning the power switch off, waiting time may be required before disconnecting the cable from the negative (-) auxiliary battery terminal. Therefore, make sure to read the disconnecting the cable from the negative (-) auxiliary battery terminal notices before proceeding with work Click here.

  • When disconnecting the cable from the negative (-) auxiliary 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 GTS (See page ), and then wiggle each connector of the airbag system or drive the vehicle on various types of road Click here.

PROCEDURE


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


    1. A000NZJE03
      Text in Illustration
      *1 Driver Side Knee Squib
      *2 Center Airbag Sensor Assembly
      *3 Connector C
      *4 SST
      *a

      Front view of wire harness connector

      (to Driver Side Knee Squib)

      Turn the power switch off.

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

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

    7. Clear the DTCs Click here.

    8. Turn the power switch off.

    9. Turn the power switch on (IG), 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.

    11. Turn the power switch off.

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

    13. Disconnect SST from connector C.


    OK

    REPLACE LOWER NO. 1 INSTRUMENT PANEL AIRBAG ASSEMBLY Click here

    NG

  2. CHECK CONNECTOR


    1. Disconnect the connectors from the center airbag sensor assembly.

    2. A000SHLE06
      Text in Illustration
      *1 Driver Side Knee Squib
      *2 Instrument Panel Wire
      *3 Center Airbag Sensor Assembly

      Check that the connectors (on the center airbag sensor assembly side and lower No. 1 instrument panel airbag assembly side) are 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 DRIVER SIDE KNEE SQUIB CIRCUIT


    1. A000P00E03
      Text in Illustration
      *1 Driver Side Knee Squib
      *2 Instrument Panel Wire
      *3 Center Airbag Sensor Assembly
      *4 Connector C
      *a

      Front view of wire harness connector

      (to Driver Side Knee Squib)

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

    2. Turn the power switch on (IG).

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      N14-1 (DK+) - Body ground Power switch on (IG) Below 1 V
      N14-2 (DK-) - Body ground Power switch on (IG) Below 1 V

    4. Turn the power switch off.

    5. Disconnect the cable from the negative (-) auxiliary 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
      N14-1 (DK+) - N14-2 (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
      N14-1 (DK+) - N14-2 (DK-) Always 1 MΩ or higher
      N14-1 (DK+) - Body ground Always 1 MΩ or higher
      N14-2 (DK-) - Body ground Always 1 MΩ or higher

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


    NG

    REPLACE INSTRUMENT PANEL WIRE

    OK

  4. CHECK CENTER AIRBAG SENSOR ASSEMBLY


    1. A000SDYE26
      Text in Illustration
      *1 Driver Side Knee Squib
      *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 (-) auxiliary battery terminal, and wait for at least 2 seconds.

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

    4. Clear the DTCs Click here.

    5. Turn the power switch off.

    6. Turn the power switch on (IG), 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