AIRBAG SYSTEM, Diagnostic DTC:B1800/51, B1801/51, B1802/51, B1803/51

DTC Code DTC Name
B1800/51 Short in Driver Side Squib Circuit
B1801/51 Open in Driver Side Squib Circuit
B1802/51 Short to GND in Driver Side Squib Circuit
B1803/51 Short to B+ in Driver Side Squib Circuit

DESCRIPTION


DTC No. DTC Detection Condition Trouble Area
B1800/51
  • The airbag sensor assembly receives a line short circuit signal in the driver side squib circuit during primary check.

  • Driver side squib malfunction

  • Spiral cable sub-assembly malfunction

  • Airbag sensor assembly malfunction


  • Instrument panel wire

  • Spiral cable sub-assembly

  • Steering pad (Driver side squib)

  • Airbag sensor assembly

B1801/51
  • The airbag sensor assembly receives an open circuit signal in the driver side squib circuit.

  • Driver side squib malfunction

  • Spiral cable sub-assembly malfunction

  • Airbag sensor assembly malfunction

B1802/51
  • The airbag sensor assembly receives a short circuit to ground signal in the driver side squib circuit.

  • Driver side squib malfunction

  • Spiral cable sub-assembly malfunction

  • Airbag sensor assembly malfunction

B1803/51
  • The airbag sensor assembly receives a short circuit to B+ signal in the driver side squib circuit.

  • Driver side squib malfunction

  • Spiral cable sub-assembly malfunction

  • Airbag sensor assembly malfunction

WIRING DIAGRAM

A004F5FE27

CAUTION / NOTICE / HINT

Tech Tips


  • Perform the simulation method by selecting check mode (Signal Check) using the GTS 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. A004EHAE01
      Text in Illustration
      *A w/ Curtain Shield Airbag
      *B w/o Curtain Shield Airbag
      *1 Steering Pad (Driver Side Squib)
      *2 Spiral Cable Sub-assembly
      *3 Airbag Sensor Assembly
      *4 Instrument Panel Wire

      Turn the ignition switch off.

    2. Disconnect the cable from the negative (-) auxiliary battery terminal.

      CAUTION:

      Wait at least 90 seconds after disconnecting the cable from the negative (-) auxiliary battery terminal to disable the SRS system.

    3. Check that the connectors are properly connected to the steering pad, spiral cable sub-assembly and 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 steering pad, spiral cable sub-assembly and 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 spiral cable sub-assembly connector (on the steering pad side) is not damaged.

      OK
      The lock button is not disengaged, or the claw of the lock is not deformed or damaged.
    7. Check that the short springs for the instrument panel wire and spiral cable sub-assembly with the activation prevention mechanism are not deformed or damaged.

      OK
      The short springs are not deformed or damaged.

    NG
    OK
  2. CHECK STEERING PAD (DRIVER SIDE SQUIB)

    SST
    09843-18061

    1. A004EZ6E01
      Text in Illustration
      *A w/ Curtain Shield Airbag
      *B w/o Curtain Shield Airbag
      *1 Steering Pad (Driver Side Squib)
      *2 Spiral Cable Sub-assembly
      *3 Airbag Sensor Assembly
      *4 Connector E
      *a

      Front view of wire harness connector

      (to Steering Pad (Driver Side Squib))

      Connect the instrument panel wire to the airbag sensor assembly and spiral cable sub-assembly.

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

      CAUTION:

      Never connect the GTS to the steering pad (driver 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.

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

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

    8. Check for DTCs Click here.

      OK
      DTC B1800/51, B1801/51, B1802/51 or B1803/51 is not output.

      Tech Tips

      Codes other than DTCs B1800/51, B1801/51, B1802/51 and B1803/51 may be output at this time, but they are not related to this check.

    9. Turn the ignition switch off.

    10. Disconnect the cable from the negative (-) auxiliary battery terminal.

      CAUTION:

      Wait at least 90 seconds after disconnecting the cable from the negative (-) auxiliary battery terminal to disable the SRS system.

    11. Disconnect SST from connector E.


    OK
    NG
  3. CHECK DRIVER SIDE SQUIB CIRCUIT


    1. A004FI7E01
      Text in Illustration
      *A w/ Curtain Shield Airbag
      *B w/o Curtain Shield Airbag
      *1 Steering Pad (Driver Side Squib)
      *2 Spiral Cable Sub-assembly
      *3 Airbag Sensor Assembly
      *4 Connector E
      *a

      Front view of wire harness connector

      (to Steering Pad (Driver Side Squib))

      Disconnect the instrument panel wire from the airbag sensor assembly.

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


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

      2. Turn the ignition switch to ON (IG).

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

        Standard Voltage
        Tester Connection Switch Condition Specified Condition
        z3-2 (D+) - Body ground Ignition switch ON (IG) Below 1 V
        z3-1 (D-) - Body ground Ignition switch ON (IG) Below 1 V
    3. Check for an open in the circuit.


      1. Turn the ignition switch off.

      2. Disconnect the cable from the negative (-) auxiliary battery terminal.

        CAUTION:

        Wait at least 90 seconds after disconnecting the cable from the negative (-) auxiliary battery terminal to disable the SRS system.

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

        Standard Resistance
        Tester Connection Condition Specified Condition
        z3-2 (D+) - z3-1 (D-) Always Below 1 Ω
    4. 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
        z3-2 (D+) - Body ground Always 1 MΩ or higher
        z3-1 (D-) - Body ground Always 1 MΩ or higher
    5. 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
        z3-2 (D+) - z3-1 (D-) Always 1 MΩ or higher
    6. Restore the released activation prevention mechanism of connector B to the original condition.


    NG
    OK
  4. CHECK DTC


    1. Connect the connectors to the steering pad and airbag sensor assembly.

    2. Connect the cable to the negative (-) auxiliary battery terminal.

    3. Turn the ignition switch to ON (IG), and wait for at least 60 seconds.

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

    5. Turn the ignition switch off.

    6. Turn the ignition switch to ON (IG), and wait for at least 60 seconds.

    7. Check for DTCs Click here.

      OK
      DTC B1800/51, B1801/51, B1802/51 or B1803/51 is not output.

      Tech Tips

      Codes other than DTCs B1800/51, B1801/51, B1802/51 and B1803/51 may be output at this time, but they are not related to this check.


    OK
    NG
  5. CHECK INSTRUMENT PANEL WIRE


    1. A004E4GE02
      Text in Illustration
      *A w/ Curtain Shield Airbag
      *B w/o Curtain Shield Airbag
      *1 Steering Pad (Driver Side Squib)
      *2 Spiral Cable Sub-assembly
      *3 Airbag Sensor Assembly
      *4 Instrument Panel Wire
      *5 Connector C
      *a

      Front view of wire harness connector

      (to Spiral Cable Sub-assembly)

      Disconnect the instrument panel wire from the spiral cable sub-assembly.

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


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

      2. Turn the ignition switch to ON (IG).

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

        Standard Voltage
        Tester Connection Switch Condition Specified Condition
        F15-1 (D+) - Body ground Ignition switch ON (IG) Below 1 V
        F15-2 (D-) - Body ground Ignition switch ON (IG) Below 1 V
    3. Check for an open in the circuit.


      1. Turn the ignition switch off.

      2. Disconnect the cable from the negative (-) auxiliary battery terminal.

        CAUTION:

        Wait at least 90 seconds after disconnecting the cable from the negative (-) auxiliary battery terminal to disable the SRS system.

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

        Standard Resistance
        Tester Connection Condition Specified Condition
        F15-1 (D+) - F15-2 (D-) Always Below 1 Ω
    4. 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
        F15-1 (D+) - Body ground Always 1 MΩ or higher
        F15-2 (D-) - Body ground Always 1 MΩ or higher
    5. 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
        F15-1 (D+) - F15-2 (D-) Always 1 MΩ or higher
    6. Restore the released activation prevention mechanism of connector B to the original condition.


    NG
    OK
  6. CHECK SPIRAL CABLE SUB-ASSEMBLY


    1. A004F4KE01
      Text in Illustration
      *A w/ Curtain Shield Airbag
      *B w/o Curtain Shield Airbag
      *1 Steering Pad (Driver Side Squib)
      *2 Spiral Cable Sub-assembly
      *3 Airbag Sensor Assembly
      *4 Instrument Panel Wire
      *5 Connector E
      *a

      Front view of wire harness connector

      (to Steering Pad (Driver Side Squib))

      Check for a short to B+ in the circuit.


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

      2. Turn the ignition switch to ON (IG).

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

        Standard Voltage
        Tester Connection Switch Condition Specified Condition
        z3-2 (D+) - Body ground Ignition switch ON (IG) Below 1 V
        z3-1 (D-) - Body ground Ignition switch ON (IG) Below 1 V
    2. Check for an open in the circuit.


      1. Turn the ignition switch off.

      2. Disconnect the cable from the negative (-) auxiliary battery terminal.

        CAUTION:

        Wait at least 90 seconds after disconnecting the cable from the negative (-) auxiliary battery terminal to disable the SRS system.

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

        Standard Resistance
        Tester Connection Condition Specified Condition
        z3-2 (D+) - z3-1 (D-) Always Below 1 Ω
    3. 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
        z3-2 (D+) - Body ground Always 1 MΩ or higher
        z3-1 (D-) - Body ground Always 1 MΩ or higher
    4. Check for a short in the circuit.


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

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

        Standard Resistance
        Tester Connection Condition Specified Condition
        z3-2 (D+) - z3-1 (D-) Always 1 MΩ or higher
    5. Restore the released activation prevention mechanism of connector D to the original condition.


    OK
    NG