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

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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
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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 the 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 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 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 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 squib)

  • Center airbag sensor assembly
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WIRING DIAGRAM

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INSPECTION PROCEDURE

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 (see pageClick 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 (see pageClick here).

Tip:

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

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PROCEDURE


  1. Click here

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


    1. Turn the power switch OFF.

    2. Disconnect the negative (-) terminal cable from the auxiliary 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 the tester to the front passenger side knee airbag (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.

      09843-18061

    5. Connect the negative (-) terminal cable to the auxiliary battery, 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 (see pageClick 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 (see pageClick here).

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

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


  2. Click here

    CHECK CONNECTOR


    1. Turn the power switch OFF.

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

  3. Click here

    CHECK INSTRUMENT PANEL WIRE (FRONT PASSENGER KNEE AIRBAG CIRCUIT)


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

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

    3. Turn the power 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 Power switch ON (IG) Below 1 V
      L86-2 (PK-) - Body ground Power switch ON (IG) Below 1 V

    5. Turn the power switch OFF.

    6. Disconnect the negative (-) terminal cable from the auxiliary 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 (see pageClick 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

  4. Click here

    CHECK 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 auxiliary battery, 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 (see pageClick 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 (see pageClick here).

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

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


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    USE SIMULATION METHOD TO CHECKClick here

  6. Click here

    REPLACE FRONT PASSENGER SIDE KNEE AIRBAG ASSEMBLYClick here

  7. Click here

    REPLACE INSTRUMENT PANEL WIRE

  8. Click here

    REPLACE CENTER AIRBAG SENSOR ASSEMBLYClick here