AIRBAG SYSTEM, Diagnostic DTC:B1825/56, B1826/56, B1827/56, B1828/56

DTC Code DTC Name
B1825/56 Short in Front Passenger Side - Side Squib Circuit
B1826/56 Open in Front Passenger Side - Side Squib Circuit
B1827/56 Short to GND in Front Passenger Side - Side Squib Circuit
B1828/56 Short to B+ in Front Passenger Side - Side Squib Circuit

DESCRIPTION

The front passenger side - side squib circuit consists of the center airbag sensor assembly and the front seat side airbag assembly (passenger side).

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

These DTCs are recorded when a malfunction is detected in the front passenger side - side squib circuit.

DTC No. DTC Detection Condition Trouble Area
B1825/56

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

  • Front passenger side - side squib malfunction

  • Center airbag sensor assembly malfunction

  • Floor wire (for LHD)

  • No. 2 floor wire (for RHD)

  • Front seat side airbag assembly (Front passenger side - side squib)

  • Center airbag sensor assembly
B1826/56

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

  • Front passenger side - side squib malfunction

  • Center airbag sensor assembly malfunction

  • Floor wire (for LHD)

  • No. 2 floor wire (for RHD)

  • Front seat side airbag assembly (Front passenger side - side squib)

  • Center airbag sensor assembly
B1827/56

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

  • Front passenger side - side squib malfunction

  • Center airbag sensor assembly malfunction

  • Floor wire (for LHD)

  • No. 2 floor wire (for RHD)

  • Front seat side airbag assembly (Front passenger side - side squib)

  • Center airbag sensor assembly
B1828/56

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

  • Front passenger side - side squib malfunction

  • Center airbag sensor assembly malfunction

  • Floor wire (for LHD)

  • No. 2 floor wire (for RHD)

  • Front seat side airbag assembly (Front passenger side - side squib)

  • Center airbag sensor assembly

WIRING DIAGRAM

A0163INE09

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. A01614JE10

      Turn the engine 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 side airbag 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 side airbag 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 short spring for the wire harness 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 (for LHD) B
      NG (for RHD) C

    B

    REPLACE FLOOR WIRE

    C

    REPLACE FLOOR WIRE NO. 2

    A

  2. CHECK FRONT SEAT SIDE AIRBAG ASSEMBLY (FRONT PASSENGER SIDE - SIDE SQUIB)


    1. A015ZHSE02

      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 side airbag assembly (Front passenger side - side 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 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 B1825, B1826, B1827, B1828, or 56 is not output.

      Tech Tips

      Codes other than DTC B1825, B1826, B1827, B1828, and 56 may be output at this time, but they are not related to this check.


    NG

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

    OK

    REPLACE FRONT SEAT SIDE AIRBAG ASSEMBLY (PASSENGER SIDE) Click here

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


    1. A0160FPE02

      Turn the engine 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 connector 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
        for LHD
        Tester Connection Switch Condition Specified Condition
        Pc1-1 (SFR+) - Body ground Engine switch on (IG) Below 1 V
        Pc1-2 (SFR-) - Body ground Engine switch on (IG) Below 1 V
        for RHD
        Tester Connection Switch Condition Specified Condition
        Qd1-1 (SFL+) - Body ground Engine switch on (IG) Below 1 V
        Qd1-2 (SFL-) - Body ground Engine 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 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
        for LHD
        Tester Connection Condition Specified Condition
        Pc1-1 (SFR+) - Pc1-2 (SFR-) Always Below 1 Ω
        for RHD
        Tester Connection Condition Specified Condition
        Qd1-1 (SFL+) - Qd1-2 (SFL-) 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 Condition Specified Condition
        Pc1-1 (SFR+) - Body ground Always 1 MΩ or higher
        Pc1-2 (SFR-) - Body ground Always 1 MΩ or higher
        for RHD
        Tester Connection Condition Specified Condition
        Qd1-1 (SFL+) - Body ground Always 1 MΩ or higher
        Qd1-2 (SFL-) - 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 Condition Specified Condition
        Pc1-1 (SFR+) - Pc1-2 (SFR-) Always 1 MΩ or higher
        for RHD
        Tester Connection Condition Specified Condition
        Qd1-1 (SFL+) - Qd1-2 (SFL-) 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. A015ZD5E01

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

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

    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 B1825, B1826, B1827, B1828, or 56 is not output.

      Tech Tips

      Codes other than DTC B1825, B1826, B1827, B1828, and 56 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