AIRBAG SYSTEM, Diagnostic DTC:B1900/73, B1901/73, B1902/73, B1903/73

DTC Code DTC Name
B1900/73 Short in Front Pretensioner Squib RH Circuit
B1901/73 Open in Front Pretensioner Squib RH Circuit
B1902/73 Short to GND in Front Pretensioner Squib RH Circuit
B1903/73 Short to B+ in Front Pretensioner Squib RH Circuit

DESCRIPTION

The front pretensioner squib RH circuit consists of the center airbag sensor assembly and front seat outer belt assembly RH.

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

These DTCs are stored when a malfunction is detected in the front pretensioner squib RH circuit.

DTC No. DTC Detection Condition Trouble Area
B1900/73

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

  • Front pretensioner squib RH malfunction

  • Center airbag sensor assembly malfunction

  • Floor wire

  • Front seat outer belt assembly RH (Front pretensioner squib RH)

  • Center airbag sensor assembly
B1901/73

  • The center airbag sensor assembly receives an open circuit signal in the front pretensioner squib RH circuit.

  • Front pretensioner squib RH malfunction

  • Center airbag sensor assembly malfunction

  • Floor wire

  • Front seat outer belt assembly RH (Front pretensioner squib RH)

  • Center airbag sensor assembly
B1902/73

  • The center airbag sensor assembly receives a short circuit to ground signal in the front pretensioner squib RH circuit.

  • Front pretensioner squib RH malfunction

  • Center airbag sensor assembly malfunction

  • Floor wire

  • Front seat outer belt assembly RH (Front pretensioner squib RH)

  • Center airbag sensor assembly
B1903/73

  • The center airbag sensor assembly receives a short circuit to B+ signal in the front pretensioner squib RH circuit.

  • Front pretensioner squib RH malfunction

  • Center airbag sensor assembly malfunction

  • Floor wire

  • Front seat outer belt assembly RH (Front pretensioner squib RH)

  • Center airbag sensor assembly

WIRING DIAGRAM

A017D6HE58

INSPECTION PROCEDURE

Tech Tips


  • Perform the simulation method by selecting check mode (Signal Check) using 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. A017EU0E54

      Turn the ignition switch off.

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

    3. Check that the connectors are properly connected to the front seat outer belt assembly RH 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 RH and center 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 floor wire connector (on the front seat outer belt assembly RH side) is not damaged.

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

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

      OK
      The short spring is not deformed or damaged.

    NG

    REPLACE FLOOR WIRE

    OK

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


    1. A017D3WE07

      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 RH (front pretensioner squib RH) for measurement, as this may lead to a serious injury due to pretensioner 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 cable to the negative (-) battery terminal.

    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 B1900, B1901, B1902, B1903 or 73 is not output.

      Tech Tips

      Codes other than DTCs B1900, B1901, B1902, B1903 and 73 may be output at this time, but they are not related to this check.


    NG

    CHECK FLOOR WIRE (FRONT PRETENSIONER SQUIB RH CIRCUIT) Click here

    OK

    REPLACE FRONT SEAT OUTER BELT ASSEMBLY RH Click here

  3. CHECK FLOOR WIRE (FRONT PRETENSIONER SQUIB RH CIRCUIT)


    1. A017DV6E14

      Turn the ignition 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. Disconnect the floor wire from the center airbag sensor assembly.

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


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

      2. Turn the ignition switch on (IG).

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

        Standard Voltage
        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

    6. Check for an open in the circuit.


      1. Turn the ignition switch off.

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

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

        Standard Resistance
        Tester Connection Condition Specified Condition
        N4-1 (R+) - N4-2 (R-) Always Below 1 Ω

    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
        Tester Connection Condition Specified Condition
        N4-1 (R+) - Body ground Always 1 MΩ or higher
        N4-2 (R-) - Body ground Always 1 MΩ or higher

    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
        Tester Connection Condition Specified Condition
        N4-1 (R+) - N4-2 (R-) Always 1 MΩ or higher

    NG

    REPLACE FLOOR WIRE

    OK

  4. CHECK CENTER AIRBAG SENSOR ASSEMBLY


    1. A017CQME12

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

    2. Connect the connectors to the front seat outer belt assembly RH and center airbag sensor assembly.

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

    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 B1900, B1901, B1902, B1903 or 73 is not output.

      Tech Tips

      Codes other than DTCs B1900, B1901, B1902, B1903 and 73 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