AIRBAG SYSTEM, Diagnostic DTC:B19A5/A6, B19A6/A6, B19A7/A6, B19A8/A6

DTC Code DTC Name
B19A5/A6 Short in Front Active Headrest Squib LH Circuit
B19A6/A6 Open in Front Active Headrest Squib LH Circuit
B19A7/A6 Short to GND in Front Active Headrest Squib LH Circuit
B19A8/A6 Short to B+ in Front Active Headrest Squib LH Circuit

DESCRIPTION

The front active headrest squib LH circuit consists of the center airbag sensor assembly and the active headrest inflator LH.

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

These DTCs are recorded when a malfunction is detected in the front active headrest squib LH circuit.

Tech Tips

For vehicles not equipped with active headrest inflators:

Vehicles that are not equipped with active headrest inflators still contain active headrest inflator circuits and use substitution parts in replace of the active headrest inflators. If a malfunction occurs in this active headrest inflator circuit, DTC B19A5, B19A6, B19A7 or B19A8 is stored.

DTC Code Detection Condition Trouble Area
B19A5/A6

One of the following conditions is met:


  • The center airbag sensor assembly receives a line short circuit signal 5 times in the front active headrest squib LH circuit during primary check.

  • Front active headrest squib LH malfunction

  • Center airbag sensor assembly malfunction

  • No. 2 floor wire

  • Front seat wire LH

  • Active headrest inflator assembly LH (Front active headrest squib LH)

  • Center airbag sensor assembly
B19A6/A6

One of the following conditions is met:


  • The center airbag sensor assembly receives an open circuit signal in the front active headrest squib LH circuit for 2 seconds.

  • Front active headrest squib LH malfunction

  • Center airbag sensor assembly malfunction

  • No. 2 floor wire

  • Front seat wire LH

  • Active headrest inflator assembly LH (Front active headrest squib LH)

  • Center airbag sensor assembly
B19A7/A6

One of the following conditions is met:


  • The center airbag sensor assembly receives a short circuit to ground signal in the front active headrest squib LH circuit for 0.5 seconds.

  • Front active headrest squib LH malfunction

  • Center airbag sensor assembly malfunction

  • No. 2 floor wire

  • Front seat wire LH

  • Active headrest inflator assembly LH (Front active headrest squib LH)

  • Center airbag sensor assembly
B19A8/A6

One of the following conditions is met:


  • The center airbag sensor assembly receives a short circuit to B+ signal in the front active headrest squib LH circuit for 0.5 seconds.

  • Front active headrest squib LH malfunction

  • Center airbag sensor assembly malfunction

  • No. 2 floor wire

  • Front seat wire LH

  • Active headrest inflator assembly LH (Front active headrest squib LH)

  • Center airbag sensor assembly

WIRING DIAGRAM

A01H047E39

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 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


  • Change the intelligent tester to 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 ACTIVE HEADREST INFLATOR LH (FRONT ACTIVE HEADREST SQUIB LH)

    A01GWC3E07

    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 active headrest inflator LH.

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

      CAUTION:

      Never connect a tester to the active headrest inflator LH (front active headrest squib LH) 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 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 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 B19A5, B19A6, B19A7, B19A8 or A6 is not output.

      Tech Tips

      Codes other than DTC B19A5, B19A6, B19A7, B19A8 and A6 may be output at this time, but they are not related to this check.


    NG

    CHECK CONNECTOR Click here

    OK

    REPLACE ACTIVE HEADREST INFLATOR LH Click here

  2. 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 E.

    4. Check that the No. 2 floor wire connector (on the active headrest inflator LH side) is not damaged.

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

    NG

    REPLACE NO. 2 FLOOR WIRE

    OK

  3. CHECK NO. 2 FLOOR WIRE (FRONT ACTIVE HEADREST SQUIB LH CIRCUIT)

    A01GX39E07

    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
      e104-1 (AHL+) - Body ground Power switch ON (IG) Below 1 V
      e104-2 (AHL-) - 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
      e104-1 (AHL+) - e104-2 (AHL-) 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
      e104-1 (AHL+) - e104-2 (AHL-) Always 1 MΩ or higher
      e104-1 (AHL+) - Body ground Always 1 MΩ or higher
      e104-2 (AHL-) - Body ground Always 1 MΩ or higher
      Result
      Result Proceed to
      OK A
      NG B

    A

    CHECK CENTER AIRBAG SENSOR ASSEMBLY Click here

    B

  4. CHECK FRONT SEAT WIRE LH

    A01H1HME07

    1. Disconnect the No. 2 floor wire connector from the front seat wire LH.

    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
      e104-1 (AHL+) - Body ground Power switch ON (IG) Below 1 V
      e104-2 (AHL-) - 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
      e104-1 (AHL+) - e104-2 (AHL-) Always Below 1 Ω

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

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

      Standard resistance
      Tester Connection Condition Specified Condition
      e104-1 (AHL+) - e104-2 (AHL-) Always 1 MΩ or higher
      e104-1 (AHL+) - Body ground Always 1 MΩ or higher
      e104-2 (AHL-) - Body ground Always 1 MΩ or higher

    NG

    REPLACE FRONT SEAT WIRE LH

    OK

    REPLACE NO. 2 FLOOR WIRE

  5. CHECK CENTER AIRBAG SENSOR ASSEMBLY

    A01H194E02

    1. Connect the connectors to the active headrest inflator LH 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 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 B19A5, B19A6, B19A7, B19A8 or A6 is not output.

      Tech Tips

      Codes other than DTC B19A5, B19A6, B19A7, B19A8 and A6 may be output at this time, but they are not related to this check.


    NG

    REPLACE CENTER AIRBAG SENSOR ASSEMBLY Click here

    OK

    USE SIMULATION METHOD TO CHECK Click here