AIRBAG SYSTEM, Diagnostic DTC:B1865/65,B1866/65,B1867/65 and 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 and lower No. 2 instrument panel airbag.

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 No.

Detection Item

DTC Detection Condition

Trouble Area

Test Mode / Check Mode

B1865/65

Short in Front Passenger Side Knee Airbag Squib Circuit

One of the following conditions is met:

  • The center airbag sensor 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 malfunction.

  • Instrument panel wire

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

  • Center airbag sensor assembly

*2

B1866/65

Open in Front Passenger Side Knee Airbag Squib Circuit

One of the following conditions is met:

  • The center airbag sensor 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 malfunction.

  • Instrument panel wire

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

  • Center airbag sensor assembly

*2

B1867/65

Short to GND in Front Passenger Side Knee Airbag Squib Circuit

One of the following conditions is met:

  • The center airbag sensor 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 malfunction.

  • Instrument panel wire

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

  • Center airbag sensor assembly

*2

B1868/65

Short to B+ in Front Passenger Side Knee Airbag Squib Circuit

One of the following conditions is met:

  • The center airbag sensor 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 malfunction.

  • Instrument panel wire

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

  • Center airbag sensor assembly

*2

WIRING DIAGRAM

C146265E25

CAUTION / NOTICE / HINT

Note:

  • After turning the engine 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).

Tip:

To perform the simulation method, enter check mode (signal check) with the intelligent tester (Click here), 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 (FRONT PASSENGER SIDE KNEE SQUIB)

    1. C213953C04

      *1

      Front Passenger Side Knee Squib

      *2

      Center Airbag Sensor

      *3

      Connector C

      *4

      SST

      *a

      Front view of wire harness connector

      (to Front Passenger Side Knee Squib)

      Turn the engine 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. 2 instrument panel airbag.

    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 (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.

    5. Connect the cable to the negative (-) battery terminal, 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

      Body Electrical > SRS Airbag > Clear DTCs

    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

      Body Electrical > SRS Airbag > Trouble Codes

      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.

      Result

      Result

      OK

      NG

    09843-18061

    OK

    REPLACE LOWER NO. 2 INSTRUMENT PANEL AIRBAG ASSEMBLY

    Click here

    NG

  2. CHECK CONNECTOR

    1. Turn the engine 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. C214776C03

      *1

      Front Passenger Side Knee Squib

      *2

      Center Airbag Sensor

      Check that the instrument panel wire connector (on the lower No. 2 instrument panel airbag side) is not damaged.

      OK

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

      Result

      Result

      OK

      NG
    NG

    REPLACE INSTRUMENT PANEL WIRE

    OK

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

    1. C213954C04

      *1

      Front Passenger Side Knee Squib

      *2

      Instrument Panel Wire

      *3

      Center Airbag Sensor

      *4

      Connector C

      *a

      Front view of wire harness connector

      (to Front Passenger Side Knee Squib)

      Disconnect the connectors from center airbag sensor.

    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

      G20-1 (PK+) - Body ground

      Engine switch on (IG)

      Below 1 V

      G20-2 (PK-) - Body ground

      Engine switch on (IG)

      Below 1 V

    4. Turn the engine 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

      G20-1 (PK+) - G20-2 (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

      G20-1 (PK+) - G20-2 (PK-)

      Always

      1 MΩ or higher

      G20-1 (PK+) - Body ground

      Always

      1 MΩ or higher

      G20-2 (PK-) - Body ground

      Always

      1 MΩ or higher

      Result

      Result

      OK

      NG
    NG

    REPLACE INSTRUMENT PANEL WIRE

    OK

  4. CHECK CENTER AIRBAG SENSOR

    1. C146268C05

      *1

      Front Passenger Side Knee Squib

      *2

      Center Airbag Sensor

      Connect the connectors to the lower No. 2 instrument panel airbag and the center airbag sensor.

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

      Body Electrical > SRS Airbag > Clear DTCs

    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

      Body Electrical > SRS Airbag > Trouble Codes

      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.

      Result

      Result

      OK

      NG
    OK

    USE SIMULATION METHOD TO CHECK

    Click here

    NG

    REPLACE CENTER AIRBAG SENSOR ASSEMBLY

    Click here