AIRBAG SYSTEM, Diagnostic DTC:B1863/64

DTC Code DTC Name
B1863/64 Short to B+ in Driver Side Knee Airbag Squib Circuit

DESCRIPTION

The driver side knee airbag squib circuit consists of the airbag sensor assembly and lower No. 1 instrument panel airbag assembly.

The airbag sensor assembly uses this circuit to deploy the airbag when deployment conditions are met.

DTC B1863/64 is stored when a short to B+ is detected in the driver side knee airbag squib circuit.

DTC No. Detection Item DTC Detection Condition Trouble Area Test Mode / Check Mode
B1863/64 Short to B+ in Driver Side Knee Airbag Squib Circuit

  • The airbag sensor assembly detects a short to B+ in the driver side knee airbag squib.

  • Driver side knee airbag squib malfunction

  • Airbag sensor assembly malfunction

  • Instrument panel wire

  • Driver side knee airbag squib (Lower No. 1 instrument panel airbag assembly)

  • Airbag sensor assembly

 Applies to check mode

WIRING DIAGRAM

A01MIN8E05
*a Driver Side Knee Airbag Squib (Lower No. 1 Instrument Panel Airbag Assembly)
*b 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

Tech Tips


  • Perform the simulation method by selecting check mode (Signal Check) using the GTS.

    Click here

  • After selecting check mode (Signal Check), perform the simulation method by wiggling each connector of the airbag system or driving the vehicle on a city road or rough road.

    Click here

PROCEDURE


  1. CHECK CONNECTORS


    1. A01MJJ7C01
      *1 Lower No. 1 Instrument Panel Airbag Assembly
      *2 Airbag Sensor Assembly
      *3 Instrument Panel Wire

      Turn the power switch off.

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

    3. Check that the connectors are properly connected to the lower No. 1 instrument panel airbag assembly and airbag sensor assembly.

      OK
      The connectors are properly connected.

      Tech Tips

      If the connectors are not properly connected, reconnect the connectors and proceed to the next inspection.

    4. Disconnect the connectors from the lower No. 1 instrument panel airbag assembly and airbag sensor assembly.

    5. Check that the terminals of the connectors are not damaged.

      OK
      The terminals are not deformed or damaged.

    6. Check that the instrument panel wire connector (on the lower No. 1 instrument panel airbag assembly side) is not damaged.

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

    7. Check that the short spring for the instrument panel wire with the activation prevention mechanism is not deformed or damaged.

      OK
      The short spring is not deformed or damaged.
      Result
      Proceed to
      OK
      NG

    NG

    REPLACE INSTRUMENT PANEL WIRE

    OK

  2. CHECK INSTRUMENT PANEL WIRE


    1. A01MFI8C01
      *1 Lower No. 1 Instrument Panel Airbag Assembly
      *2 Airbag Sensor Assembly
      *3 Instrument Panel Wire
      *a

      Front view of wire harness connector

      (to Lower No. 1 Instrument Panel Airbag Assembly)

      Check for a short to B+ in the circuit.


      1. Connect the cable to the negative (-) auxiliary battery terminal.

      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
        G31-1 (DK+) - Body ground Power switch on (IG) Below 1 V
        G31-2 (DK-) - Body ground Power switch on (IG) Below 1 V
      Result
      Proceed to
      OK
      NG

    NG

    REPLACE INSTRUMENT PANEL WIRE

    OK

  3. CHECK DTC


    1. A01MHFLC01
      *1 Lower No. 1 Instrument Panel Airbag Assembly
      *2 Airbag Sensor Assembly
      *a

      Front view of wire harness connector

      (to Lower No. 1 Instrument Panel Airbag Assembly)
      *b Service Wire

      Turn the power switch off.

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

    3. Connect the connectors to the airbag sensor assembly.

    4. Using a service wire, connect terminals 1 (DK+) and 2 (DK-) of connector C.

      Note

      Do not forcibly insert the service wire into the terminals of the connector when connecting the wire.

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

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

    7. Clear the DTCs stored in memory.

      Click here


      Body Electrical > SRS Airbag > Clear DTCs

    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


      Body Electrical > SRS Airbag > Trouble Codes
      OK
      DTC B1863/64 is not output.

      Tech Tips

      Codes other than DTC 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 the service wire from connector C.

      Result
      Proceed to
      OK
      NG

    NG

    REPLACE AIRBAG SENSOR ASSEMBLY Click here

    OK

  4. CHECK DTC


    1. A01MH58C01
      *1 Lower No. 1 Instrument Panel Airbag Assembly
      *2 Airbag Sensor Assembly

      Connect the connectors to the lower No. 1 instrument panel airbag assembly.

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

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

    4. Clear the DTCs stored in memory.

      Click here


      Body Electrical > SRS Airbag > Clear DTCs

    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


      Body Electrical > SRS Airbag > Trouble Codes
      OK
      DTC B1863/64 is not output.

      Tech Tips

      Codes other than DTC B1863/64 may be output at this time, but they are not related to this check.

      Result
      Proceed to
      OK
      NG

    OK

    USE SIMULATION METHOD TO CHECK Click here

    NG

    REPLACE LOWER NO. 1 INSTRUMENT PANEL AIRBAG ASSEMBLY Click here