AIRBAG SYSTEM, Diagnostic DTC:B1905/74, B1906/74, B1907/74, B1908/74

DTC Code DTC Name
B1905/74 Short in Front Passenger Side Pretensioner Squib Circuit
B1906/74 Open in Front Passenger Side Pretensioner Squib Circuit
B1907/74 Short to GND in Front Passenger Side Pretensioner Squib Circuit
B1908/74 Short to B+ in Front Passenger Side Pretensioner Squib Circuit

DESCRIPTION

The front passenger side pretensioner squib circuit consists of the center airbag sensor assembly and the front seat outer belt assembly (Passenger side).

This 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 pretensioner squib circuit.

DTC No. DTC Detection Condition Trouble Area
B1905/74

  • The center airbag sensor assembly receives a line short circuit signal 5 times in the front passenger side pretensioner squib circuit during primary check.

  • Front passenger side pretensioner squib malfunction

  • Center airbag sensor assembly malfunction

  • Floor wire (for LHD)

  • Floor wire No. 2 (for RHD)

  • Front seat outer belt assembly (Front passenger side pretensioner squib)

  • Center airbag sensor assembly
B1906/74

  • The center airbag sensor assembly receives an open circuit signal in the front passenger side pretensioner squib circuit for 2 seconds.

  • Front passenger side pretensioner squib malfunction

  • Center airbag sensor assembly malfunction

  • Floor wire (for LHD)

  • Floor wire No. 2 (for RHD)

  • Front seat outer belt assembly (Front passenger side pretensioner squib)

  • Center airbag sensor assembly
B1907/74

  • The center airbag sensor assembly receives a short circuit to ground signal in the front passenger side pretensioner squib circuit for 0.5 seconds.

  • Front passenger side pretensioner squib malfunction

  • Center airbag sensor assembly malfunction

  • Floor wire (for LHD)

  • Floor wire No. 2 (for RHD)

  • Front seat outer belt assembly (Front passenger side pretensioner squib)

  • Center airbag sensor assembly
B1908/74

  • The center airbag sensor assembly receives a short circuit to B+ signal in the front passenger side pretensioner squib circuit for 0.5 seconds.

  • Front passenger side pretensioner squib malfunction

  • Center airbag sensor assembly malfunction

  • Floor wire (for LHD)

  • Floor wire No. 2 (for RHD)

  • Front seat outer belt assembly (Front passenger side pretensioner squib)

  • Center airbag sensor assembly

WIRING DIAGRAM

A017D6AE07

INSPECTION PROCEDURE

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 a city or rough road Click here.

PROCEDURE


  1. CHECK CONNECTORS


    1. A017EU0E03

      Turn the ignition switch off.

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

    3. Check that the connectors are properly connected to the front seat outer belt assembly (Passenger side) and center airbag sensor assembly.

      OK
      The connectors are properly connected.

      Tech Tips

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

    4. Disconnect the connectors from the front seat outer belt assembly (Passenger side) and center airbag sensor assembly.

    5. Check that the connector terminals are not damaged.

      OK
      The terminals are not deformed or damaged.

    6. Check that the wire harness connector (on the front seat outer belt assembly (Passenger side)) is not damaged.

      OK
      The lock button is not disengaged, and the claw of the lock is not deformed or damaged.
      Result
      Result Proceed to
      OK A
      NG (for LHD) B
      NG (for RHD) C

    B

    REPLACE FLOOR WIRE

    C

    REPLACE FLOOR WIRE NO. 2

    A

  2. CHECK FRONT SEAT OUTER BELT ASSEMBLY (FRONT PASSENGER SIDE PRETENSIONER SQUIB)


    1. A017DOPE02

      Connect the connector to the center airbag sensor assembly.

    2. Connect SST (resistance 2.1 Ω) to connector C.

      CAUTION:

      Never connect the tester to the front seat outer belt assembly (Front passenger side pretensioner 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.

      • Insert SST straight into the terminals of the connector.

      SST
      09843-18061

    3. Connect the negative (-) terminal cable to the battery.

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

    5. Clear the DTCs stored in the memory Click here.

    6. Turn the ignition switch off.

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

    8. Check for DTCs Click here.

      OK
      DTC B1905, B1906, B1907, B1908, or 74 is not output.

      Tech Tips

      Codes other than DTC B1905, B1906, B1907, B1908, and 74 may be output at this time, but they are not related to this check.


    NG

    CHECK WIRE HARNESS (FRONT PASSENGER SIDE PRETENSIONER SQUIB CIRCUIT) Click here

    OK

    REPLACE FRONT SEAT OUTER BELT ASSEMBLY (PASSENGER SIDE) Click here

  3. CHECK WIRE HARNESS (FRONT PASSENGER SIDE PRETENSIONER SQUIB CIRCUIT)


    1. A017DV6E05

      Turn the ignition switch off.

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

    3. Disconnect SST from connector C.

    4. Disconnect the connector from the center airbag sensor assembly.

    5. Check for a short to B+ in the circuit.


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

      2. Turn the ignition switch on (IG).

      3. Measure the voltage according to the value(s) in the table below.

        Standard voltage
        for LHD
        Tester Connection Switch Condition Specified Condition
        N4-1 (R+) - Body ground Ignition switch on (IG) Below 1 V
        N4-2 (R-) - Body ground Ignition switch on (IG) Below 1 V
        for RHD
        Tester Connection Switch Condition Specified Condition
        O4-1 (L+) - Body ground Ignition switch on (IG) Below 1 V
        O4-2 (L-) - Body ground Ignition switch on (IG) Below 1 V
        Result
        Result Proceed to
        OK A
        NG (for LHD) B
        NG (for RHD) C

    6. Check for an open in the circuit.


      1. Turn the ignition switch off.

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

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

        Standard resistance
        for LHD
        Tester Connection Switch Condition Specified Condition
        N4-1 (R+) - N4-2 (R-) Always Below 1 Ω
        for RHD
        Tester Connection Switch Condition Specified Condition
        O4-1 (L+) - O4-2 (L-) Always Below 1 Ω
        Result
        Result Proceed to
        OK A
        NG (for LHD) B
        NG (for RHD) C

    7. Check for a short to ground in the circuit.


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

        Standard resistance
        for LHD
        Tester Connection Switch Condition Specified Condition
        N4-1 (R+) - Body ground Always 1 MΩ or higher
        N4-2 (R-) - Body ground Always 1 MΩ or higher
        for RHD
        Tester Connection Switch Condition Specified Condition
        O4-1 (L+) - Body ground Always 1 MΩ or higher
        O4-2 (L-) - Body ground Always 1 MΩ or higher
        Result
        Result Proceed to
        OK A
        NG (for LHD) B
        NG (for RHD) C

    8. Check for a short in the circuit.


      1. Release the activation prevention mechanism built into connector B Click here.

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

        Standard resistance
        for LHD
        Tester Connection Switch Condition Specified Condition
        N4-1 (R+) - N4-2 (R-) Always 1 MΩ or higher
        for RHD
        Tester Connection Switch Condition Specified Condition
        O4-1 (L+) - O4-2 (L-) Always 1 MΩ or higher
        Result
        Result Proceed to
        OK A
        NG (for LHD) B
        NG (for RHD) C

    B

    REPLACE FLOOR WIRE

    C

    REPLACE FLOOR WIRE NO. 2

    A

  4. CHECK CENTER AIRBAG SENSOR ASSEMBLY


    1. A017FSYE01

      Restore the released activation prevention mechanism of connector B to the original condition.

    2. Connect the connectors to the front seat outer belt assembly (Passenger side) and the center airbag sensor assembly.

    3. Connect the negative (-) terminal cable to the battery.

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

    5. Clear the DTCs stored in the memory Click here.

    6. Turn the ignition switch off.

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

    8. Check for DTCs Click here.

      OK
      DTC B1905, B1906, B1907, B1908, or 74 is not output.

      Tech Tips

      Codes other than DTC B1905, B1906, B1907, B1908, or 74 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