AIRBAG SYSTEM, Diagnostic DTC:B1840/59, B1841/59, B1842/59, B1843/59

DTC Code DTC Name
B1840/59 Short in Driver Side Curtain Shield Squib 2nd Step Circuit
B1841/59 Open in Driver Side Curtain Shield Squib 2nd Step Circuit
B1842/59 Short to GND in Driver Side Curtain Shield Squib 2nd Step Circuit
B1843/59 Short to B+ in Driver Side Curtain Shield Squib 2nd Step Circuit

DESCRIPTION

The driver side curtain shield squib 2nd step circuit consists of the center airbag sensor assembly and curtain shield airbag assembly (driver side).

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

These DTCs are recorded when a malfunction is detected in the driver side curtain shield squib 2nd step circuit.

DTC No. DTC Detection Condition Trouble Area
B1840/59

  • The center airbag sensor assembly receives a line short circuit signal in the driver side curtain shield squib 2nd step circuit during primary check.

  • Driver side curtain shield squib 2nd step malfunction

  • Center airbag sensor assembly malfunction

    for LHD:

  • No. 2 floor wire

  • Curtain shield airbag assembly LH (Driver side curtain shield squib 2nd step)

  • Center airbag sensor assembly


    for RHD:

  • Floor wire

  • Curtain shield airbag assembly RH (Driver side curtain shield squib 2nd step)

  • Center airbag sensor assembly
B1841/59

  • The center airbag sensor assembly receives an open circuit signal in the driver side curtain shield squib 2nd step circuit.

  • Driver side curtain shield squib 2nd step malfunction

  • Center airbag sensor assembly malfunction

    for LHD:

  • No. 2 floor wire

  • Curtain shield airbag assembly LH (Driver side curtain shield squib 2nd step)

  • Center airbag sensor assembly


    for RHD:

  • Floor wire

  • Curtain shield airbag assembly RH (Driver side curtain shield squib 2nd step)

  • Center airbag sensor assembly
B1842/59

  • The center airbag sensor assembly receives a short circuit to ground signal in the driver side curtain shield squib 2nd step circuit.

  • Driver side curtain shield squib 2nd step malfunction

  • Center airbag sensor assembly malfunction

    for LHD:

  • No. 2 floor wire

  • Curtain shield airbag assembly LH (Driver side curtain shield squib 2nd step)

  • Center airbag sensor assembly


    for RHD:

  • Floor wire

  • Curtain shield airbag assembly RH (Driver side curtain shield squib 2nd step)

  • Center airbag sensor assembly
B1843/59

  • The center airbag sensor assembly receives a short circuit to B+ signal in the driver side curtain shield squib 2nd step circuit.

  • Driver side curtain shield squib 2nd step malfunction

  • Center airbag sensor assembly malfunction

    for LHD:

  • No. 2 floor wire

  • Curtain shield airbag assembly LH (Driver side curtain shield squib 2nd step)

  • Center airbag sensor assembly


    for RHD:

  • Floor wire

  • Curtain shield airbag assembly RH (Driver side curtain shield squib 2nd step)

  • Center airbag sensor assembly

WIRING DIAGRAM

A01CFABE07

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. for LHD:


      1. Turn the engine switch off.

        A01CEVOE36

      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 curtain shield airbag assembly LH 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 curtain shield airbag assembly LH 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 No. 2 floor wire connector (on the curtain shield airbag assembly LH 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 No. 2 floor wire with the activation prevention mechanism is not deformed or damaged.

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

    2. for RHD:


      1. Turn the engine switch off.

        A01CEVOE21

      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 curtain shield airbag 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 curtain shield airbag 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 curtain shield airbag 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.
        Result
        Result Proceed to
        OK A
        NG C

    B

    REPLACE NO. 2 FLOOR WIRE

    C

    REPLACE FLOOR WIRE

    A

  2. CHECK CURTAIN SHIELD AIRBAG ASSEMBLY (DRIVER SIDE CURTAIN SHIELD SQUIB 2ND STEP)


    1. for LHD:


      1. Connect the connector to the center airbag sensor assembly.

        A01CE21E04

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

        CAUTION:

        Never connect the tester to the curtain shield airbag assembly LH (driver side curtain shield squib 2nd step) 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.

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

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

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

      6. Turn the engine switch off.

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

      8. Check for DTCs Click here.

        OK
        DTC B1840, B1841, B1842, B1843 or 59 is not output.

        Tech Tips

        Codes other than DTCs B1840, B1841, B1842, B1843 and 59 may be output at this time, but they are not related to this check.

        Result
        Result Proceed to
        NG A
        OK B
      SST
      09843-18061

    2. for RHD:


      1. Connect the connector to the center airbag sensor assembly.

        A01CE21E02

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

        CAUTION:

        Never connect the tester to the curtain shield airbag assembly RH (driver side curtain shield squib 2nd step) 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.

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

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

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

      6. Turn the engine switch off.

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

      8. Check for DTCs Click here.

        OK
        DTC B1840, B1841, B1842, B1843 or 59 is not output.

        Tech Tips

        Codes other than DTCs B1840, B1841, B1842, B1843 and 59 may be output at this time, but they are not related to this check.

        Result
        Result Proceed to
        NG A
        OK C
      SST
      09843-18061

    B

    REPLACE CURTAIN SHIELD AIRBAG ASSEMBLY LH Click here

    C

    REPLACE CURTAIN SHIELD AIRBAG ASSEMBLY RH Click here

    A

  3. CHECK WIRE HARNESS (DRIVER SIDE CURTAIN SHIELD SQUIB 2ND STEP CIRCUIT)


    1. for LHD:


      1. Turn the engine switch off.

        A01CAQVE06

      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 No. 2 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 engine switch on (IG).

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

          Standard Voltage
          Tester Connection Switch Condition Specified Condition
          N8-2 (MPX5) - Body ground Engine switch on (IG) Below 1 V
          N8-1 (MPX6) - Body ground Engine switch on (IG) Below 1 V

      6. Check for an open in the circuit.


        1. Turn the engine 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
          N8-2 (MPX5) - N8-1 (MPX6) 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
          N8-2 (MPX5) - Body ground Always 1 MΩ or higher
          N8-1 (MPX6) - 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
          N8-2 (MPX5) - N8-1 (MPX6) Always 1 MΩ or higher
          Result
          Result Proceed to
          OK A
          NG B

    2. for RHD:


      1. Turn the engine switch off.

        A01CAQVE03

      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 engine switch on (IG).

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

          Standard Voltage
          Tester Connection Switch Condition Specified Condition
          M11-2 (GOSW) - Body ground Engine switch on (IG) Below 1 V
          M11-1 (GACT) - Body ground Engine switch on (IG) Below 1 V

      6. Check for an open in the circuit.


        1. Turn the engine 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
          M11-2 (GOSW) - M11-1 (GACT) 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
          M11-2 (GOSW) - Body ground Always 1 MΩ or higher
          M11-1 (GACT) - 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
          M11-2 (GOSW) - M11-1 (GACT) Always 1 MΩ or higher
          Result
          Result Proceed to
          OK A
          NG C

    B

    REPLACE NO. 2 FLOOR WIRE

    C

    REPLACE FLOOR WIRE

    A

  4. CHECK CENTER AIRBAG SENSOR ASSEMBLY


    1. A01CAS4E03

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

    2. for LHD:

      Connect the connectors to the curtain shield airbag assembly LH and center airbag sensor assembly.

    3. for RHD:

      Connect the connectors to the curtain shield airbag assembly RH and center airbag sensor assembly.

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

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

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

    7. Turn the engine switch off.

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

    9. Check for DTCs Click here.

      OK
      DTC B1840, B1841, B1842, B1843 or 59 is not output.

      Tech Tips

      Codes other than DTCs B1840, B1841, B1842, B1843 and 59 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