AIRBAG SYSTEM, Diagnostic DTC:B1865/65, B1866/65, B1867/65, B1868/65

DTC Code DTC Name
B1865/65 Short in Front Passenger Side Knee Airbag Squib Circuit
B1866/65 Open in Front Passenger Side Knee Airbag Squib Circuit
B1867/65 Short to GND in Front Passenger Side Knee Airbag Squib Circuit
B1868/65 Short to B+ in Front Passenger Side Knee Airbag Squib Circuit

DESCRIPTION

The front passenger side knee squib circuit consists of the center airbag sensor assembly and lower No. 2 instrument panel airbag assembly.

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

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

DTC Code DTC Detection Condition Trouble Area
B1865/65

One of the following conditions is met:


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

  • A front passenger side knee squib malfunction.

  • A center airbag sensor assembly malfunction.

  • Instrument panel wire

  • Lower No. 2 instrument panel airbag assembly (Front passenger side knee squib)

  • Center airbag sensor assembly
B1866/65

One of the following conditions is met:


  • The center airbag sensor assembly detects an open circuit signal in the front passenger side knee squib circuit for 2 seconds.

  • A front passenger side knee squib malfunction.

  • A center airbag sensor assembly malfunction.
B1867/65

One of the following conditions is met:


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

  • A front passenger side knee squib malfunction.

  • A center airbag sensor assembly malfunction.
B1868/65

One of the following conditions is met:


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

  • A front passenger side knee squib malfunction.

  • A center airbag sensor assembly malfunction.

WIRING DIAGRAM

A000R82E17
*a Lower No. 2 Instrument Panel Airbag Assembly (Front Passenger 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. 2 INSTRUMENT PANEL AIRBAG ASSEMBLY (FRONT PASSENGER SIDE KNEE SQUIB)


    1. A000QO2E02
      Text in Illustration
      *1 Front Passenger Side Knee Squib
      *2 Center Airbag Sensor Assembly
      *3 Connector C
      *4 SST
      *a

      Front view of wire harness connector

      (to Front Passenger Side Knee Squib)
      *b Color: Red

      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. 2 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. 2 instrument panel airbag assembly (front passenger 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 B1865/65, B1866/65, B1867/65 or B1868/65 is not output.

      Tech Tips

      Codes other than DTC B1865/65, B1866/65, B1867/65 and B1868/65 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. 2 INSTRUMENT PANEL AIRBAG ASSEMBLY Click here

    NG

  2. CHECK CONNECTOR


    1. Disconnect the connectors from center airbag sensor assembly.

    2. A000SHLE06
      Text in Illustration
      *1 Front Passenger 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. 2 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 FRONT PASSENGER SIDE KNEE SQUIB CIRCUIT


    1. A000RGME03
      Text in Illustration
      *1 Front Passenger Side Knee Squib
      *2 Instrument Panel Wire
      *3 Center Airbag Sensor Assembly
      *4 Connector C
      *a

      Front view of wire harness connector

      (to Front Passenger 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
      N74-1 (PK+) - Body ground Power switch on (IG) Below 1 V
      N74-2 (PK-) - 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
      N74-1 (PK+) - N74-2 (PK-) 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
      N74-1 (PK+) - N74-2 (PK-) Always 1 MΩ or higher
      N74-1 (PK+) - Body ground Always 1 MΩ or higher
      N74-2 (PK-) - 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 Front Passenger Side Knee Squib
      *2 Center Airbag Sensor Assembly

      Connect the connectors to the lower No. 2 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 B1865/65, B1866/65, B1867/65 or B1868/65 is not output.

      Tech Tips

      Codes other than DTC B1865/65, B1866/65, B1867/65 and B1868/65 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