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

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

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

DTC Code Detection Condition Trouble Area
B1865/65

One of the following conditions is met:


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

  • Front passenger side knee airbag squib malfunction

  • Center airbag sensor assembly malfunction

  • Instrument panel wire

  • Front passenger side knee airbag assembly (Front passenger side knee airbag squib)

  • Center airbag sensor assembly
B1866/65

One of the following conditions is met:


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

  • Front passenger side knee airbag squib malfunction

  • Center airbag sensor assembly malfunction

  • Instrument panel wire

  • Front passenger side knee airbag assembly (Front passenger side knee airbag squib)

  • Center airbag sensor assembly
B1867/65

One of the following conditions is met:


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

  • Front passenger side knee airbag squib malfunction

  • Center airbag sensor assembly malfunction

  • Instrument panel wire

  • Front passenger side knee airbag assembly (Front passenger side knee airbag squib)

  • Center airbag sensor assembly
B1868/65

One of the following conditions is met:


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

  • Front passenger side knee airbag squib malfunction

  • Center airbag sensor assembly malfunction

  • Instrument panel wire

  • Front passenger side knee airbag assembly (Front passenger side knee airbag squib)

  • Center airbag sensor assembly

WIRING DIAGRAM

A001DQKE40
*a Front Passenger Side Knee Airbag
*b Center Airbag Sensor Assembly

CAUTION / NOTICE / HINT

Note


  • After turning the engine switch off, waiting time may be required before disconnecting the cable from the negative (-) battery terminal. Therefore, make sure to read the disconnecting the cable from the negative (-) battery terminal notices 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


  • Perform the simulation method by selecting the "check mode" (signal check) with the intelligent tester Click here.

  • After selecting the "check mode" (signal check), perform the simulation method by wiggling each connector of the airbag system or driving the vehicle on various types of roads Click here.

PROCEDURE


  1. CHECK FRONT PASSENGER SIDE KNEE AIRBAG (FRONT PASSENGER SIDE KNEE SQUIB)

    A0019DQE04
    *1 Front Passenger Side Knee Squib
    *2 Center Airbag Sensor Assembly
    *3 Front view of wire harness connector: (to Front Passenger Side Knee Squib)
    *4 Connector C

    1. Turn the engine switch off.

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

    3. Disconnect the connector from the front passenger side knee airbag.

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

      CAUTION:

      Never connect a tester to the front passenger side knee airbag (front passenger 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 SST.

      • Insert SST straight into the terminals of the connector.

      SST
      09843-18061

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

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

    7. Clear the DTCs Click here.

    8. Turn the engine switch off.

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

    10. Check for DTCs Click here.

      OK
      DTC B1865, B1866, B1867, B1868 or 65 is not output.

      Tech Tips

      Codes other than DTC B1865, B1866, B1867, B1868 and 65 may be output at this time, but they are not related to this check.


    OK

    REPLACE FRONT PASSENGER SIDE KNEE AIRBAG ASSEMBLY Click here

    NG

  2. CHECK CONNECTOR


    1. Turn the engine switch off.

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

    3. Disconnect SST from connector C.

    4. Check that the instrument panel wire connector (on the front passenger side knee airbag side) is not damaged.

      OK
      The lock button is not disengaged, or the claw of the lock is not deformed or damaged.

    NG

    REPLACE INSTRUMENT PANEL WIRE

    OK

  3. CHECK INSTRUMENT PANEL WIRE (FRONT PASSENGER KNEE SQUIB CIRCUIT)

    A001BYSE02

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

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

    3. Turn the engine switch on (IG).

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

      Standard voltage
      Tester Connection Switch Condition Specified Condition
      L86-1 (PK+) - Body ground Engine switch on (IG) Below 1 V
      L86-2 (PK-) - Body ground Engine switch on (IG) Below 1 V

    5. Turn the engine switch off.

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

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

      Standard resistance
      Tester Connection Condition Specified Condition
      L86-1 (PK+) - L86-2 (PK-) Always Below 1 Ω

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

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

      Standard resistance
      Tester Connection Condition Specified Condition
      L86-1 (PK+) - L86-2 (PK-) Always 1 MΩ or higher
      L86-1 (PK+) - Body ground Always 1 MΩ or higher
      L86-2 (PK-) - Body ground Always 1 MΩ or higher

    NG

    REPLACE INSTRUMENT PANEL WIRE

    OK

  4. CHECK CENTER AIRBAG SENSOR ASSEMBLY

    A001AQPE23
    *1 Front Passenger Side Knee Squib
    *2 Center Airbag Sensor Assembly

    1. Connect the connectors to the front passenger side knee airbag and the center airbag sensor assembly.

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

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

    4. Clear the DTCs Click here.

    5. Turn the engine switch off.

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

    7. Check for DTCs Click here.

      OK
      DTC B1865, B1866, B1867, B1868 or 65 is not output.

      Tech Tips

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