AIRBAG SYSTEM, Diagnostic DTC:B19A0/A5, B19A1/A5, B19A2/A5, B19A3/A5

DTC Code DTC Name
B19A0/A5 Short in Front Active Headrest Squib RH Circuit
B19A1/A5 Open in Front Active Headrest Squib RH Circuit
B19A2/A5 Short to GND in Front Active Headrest Squib RH Circuit
B19A3/A5 Short to B+ in Front Active Headrest Squib RH Circuit

DESCRIPTION

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

This 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 RH 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 B19A0, B19A1, B19A2 or B19A3 is stored.

DTC Code Detection Condition Trouble Area
B19A0/A5

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 RH circuit during primary check.

  • Front active front active headrest squib RH malfunction

  • Center airbag sensor assembly malfunction

  • Floor wire

  • Front seat wire RH

  • Active headrest inflator RH (Front active headrest squib RH)

  • Center airbag sensor assembly
B19A1/A5

One of the following conditions is met:


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

  • Front active front active headrest squib RH malfunction

  • Center airbag sensor assembly malfunction

  • Floor wire

  • Front seat wire RH

  • Active headrest inflator RH (Front active headrest squib RH)

  • Center airbag sensor assembly
B19A2/A5

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 RH circuit for 0.5 seconds.

  • Front active front active headrest squib RH malfunction

  • Center airbag sensor assembly malfunction

  • Floor wire

  • Front seat wire RH

  • Active headrest inflator RH (Front active headrest squib RH)

  • Center airbag sensor assembly
B19A3/A5

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 RH circuit for 0.5 seconds.

  • Front active front active headrest squib RH malfunction

  • Center airbag sensor assembly malfunction

  • Floor wire

  • Front seat wire RH

  • Active headrest inflator RH (Front active headrest squib RH)

  • Center airbag sensor assembly

WIRING DIAGRAM

A01H047E38

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


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

PROCEDURE


  1. CHECK ACTIVE HEADREST INFLATOR RH (FRONT ACTIVE HEADREST SQUIB RH)

    A01H172E06

    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 RH.

    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 RH (front active headrest squib RH) 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 B19A0, B19A1, B19A2, B19A3 or A5 is not output.

      Tech Tips

      Codes other than DTC B19A0, B19A1, B19A2, B19A3 and A5 may be output at this time, but they are not related to this check.


    NG

    CHECK CONNECTOR Click here

    OK

    REPLACE ACTIVE HEADREST INFLATOR RH 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 floor wire connector (on the active headrest inflator RH side) is not damaged.

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

    NG

    REPLACE FLOOR WIRE

    OK

  3. CHECK FLOOR WIRE (FRONT ACTIVE HEADREST SQUIB RH CIRCUIT)

    A01H0PUE06

    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
      e98-1 (AHR+) - Body ground Power switch ON (IG) Below 1 V
      e98-2 (AHR-) - 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
      e98-1 (AHR+) - e98-2 (AHR-) 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
      e98-1 (AHR+) - e98-2 (AHR-) Always 1 MΩ or higher
      e98-1 (AHR+) - Body ground Always 1 MΩ or higher
      e98-2 (AHR-) - 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 RH

    A01H28KE06

    1. Disconnect the floor wire connector from the rear seat wire.

    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
      e98-1 (AHR+) - Body ground Power switch ON (IG) Below 1 V
      e98-2 (AHR-) - 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
      e98-1 (AHR+) - e98-2 (AHR-) 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
      e98-1 (AHR+) - e98-2 (AHR-) Always 1 MΩ or higher
      e98-1 (AHR+) - Body ground Always 1 MΩ or higher
      e98-2 (AHR-) - Body ground Always 1 MΩ or higher

    NG

    REPLACE FRONT SEAT WIRE RH

    OK

    REPLACE FLOOR WIRE

  5. CHECK CENTER AIRBAG SENSOR ASSEMBLY

    A01GWC9E02

    1. Connect the connectors to the active headrest inflator RH 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 B19A0, B19A1, B19A2, B19A3 or A5 is not output.

      Tech Tips

      Codes other than DTC B19A0, B19A1, B19A2, B19A3 and A5 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