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

DTC Code DTC Name
B1800 Short in D Squib Circuit
B1801 Open in D Squib Circuit
B1802 Short in D Squib Circuit (to Ground)
B1803 Short in D Squib Circuit (to +B)

DESCRIPTION

The driver squib circuit consists of the airbag sensor assembly, spiral cable sub-assembly and horn button assembly.

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

These DTCs are stored when a malfunction is detected in the driver squib circuit.

DTC No. Detection Item DTC Detection Condition Trouble Area Warning Indicate Test Mode / Check Mode
B1800 Short in D Squib Circuit

  • The airbag sensor assembly detects a line short in the driver squib circuit during the primary check.

  • Spiral cable sub-assembly malfunction

  • Driver squib malfunction

  • Airbag sensor assembly malfunction

  • Instrument panel wire

  • Spiral cable sub-assembly

  • Driver squib (Horn button assembly)

  • Airbag sensor assembly

 Comes on Applies to check mode
B1801 Open in D Squib Circuit

  • The airbag sensor assembly detects an open in the driver squib circuit.

  • Spiral cable sub-assembly malfunction

  • Driver squib malfunction

  • Airbag sensor assembly malfunction

  • Instrument panel wire

  • Spiral cable sub-assembly

  • Driver squib (Horn button assembly)

  • Airbag sensor assembly

 Comes on Applies to check mode
B1802 Short in D Squib Circuit (to Ground)

  • The airbag sensor assembly detects a short to ground in the driver squib circuit.

  • Spiral cable sub-assembly malfunction

  • Driver squib malfunction

  • Airbag sensor assembly malfunction

  • Instrument panel wire

  • Spiral cable sub-assembly

  • Driver squib (Horn button assembly)

  • Airbag sensor assembly

 Comes on Applies to check mode
B1803 Short in D Squib Circuit (to +B)

  • The airbag sensor assembly detects a short to B+ in the driver squib circuit.

  • Spiral cable sub-assembly malfunction

  • Driver squib malfunction

  • Airbag sensor assembly malfunction

  • Instrument panel wire

  • Spiral cable sub-assembly

  • Driver squib (Horn button assembly)

  • Airbag sensor assembly

 Comes on Applies to check mode

WIRING DIAGRAM

Figure 1. w/ Occupant Classification System:

B0070NUE06

Figure 2. w/o Occupant Classification System:

B0070NUE11

CAUTION / NOTICE / HINT

Note

After turning the ignition switch off, waiting time may be required before disconnecting the cable from the negative (-) battery terminal. Therefore, make sure to read the disconnecting the cable from the negative (-) battery terminal notices before proceeding with work.

Click here

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 road or rough road.

    Click here

PROCEDURE


  1. CHECK VEHICLE CONDITION


    1. Choose the model to be inspected.

      Result
      Result Proceed to
      w/ Occupant Classification System A
      w/o Occupant Classification System B

    B

    CHECK CONNECTORS Click here

    A

  2. CHECK CONNECTORS


    1. B0070ZYC01
      *1 Horn Button Assembly
      *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 (-) battery terminal.

      CAUTION:

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

    3. Check that the connectors are properly connected to the horn button assembly, spiral cable sub-assembly and airbag sensor assembly.

      OK
      The connectors are properly connected.

      Tech Tips

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

    4. Disconnect the connectors from the horn button assembly, spiral cable sub-assembly and airbag sensor assembly.

    5. Check that the terminals of the connectors are not deformed or damaged.

      OK
      The terminals are not deformed or damaged.

    6. Check that the spiral cable sub-assembly connector (on the horn button assembly side) is not loose, deformed or damaged.

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

    7. Check that the short springs of the activation prevention mechanisms of the instrument panel wire connector and spiral cable sub-assembly connector are not deformed or damaged.

      OK
      The short springs are not deformed or damaged.
      Result
      Proceed to
      OK
      NG

    NG

    REPLACE WIRE HARNESS

    OK

  3. CHECK HORN BUTTON ASSEMBLY


    1. B006ZR9C16
      *1 Horn Button Assembly
      *2 Spiral Cable Sub-assembly
      *3 Airbag Sensor Assembly
      *a

      Front view of wire harness connector

      (to Horn Button Assembly)
      *b Color: Light Green

      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 (light green connector).

      CAUTION:

      Never connect a tester to the horn button assembly 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 it.

      • 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 to ON, and wait for at least 60 seconds.

    5. Clear the DTCs stored in memory.


      Body Electrical > SRS Airbag > Clear DTCs

    6. Turn the ignition switch off.

    7. Turn the ignition switch to ON, and wait for at least 60 seconds.

    8. Check for DTCs.


      Body Electrical > SRS Airbag > Trouble Codes
      OK
      DTC B1800, B1801, B1802 or B1803 is not output.

      Tech Tips

      Codes other than DTCs B1800, B1801, B1802 and B1803 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 (-) battery terminal.

      CAUTION:

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

    11. Disconnect SST from connector E.

      Result
      Proceed to
      OK
      NG

    OK

    REPLACE HORN BUTTON ASSEMBLY Click here

    NG

  4. CHECK DRIVER SQUIB CIRCUIT


    1. B0070PHC17
      *1 Horn Button Assembly
      *2 Spiral Cable Sub-assembly
      *3 Airbag Sensor Assembly
      *a

      Front view of wire harness connector

      (to Horn Button Assembly)
      *b Color: Light Green

      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 (-) battery terminal.

      2. Turn the ignition switch to ON.

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

        Standard Voltage
        Tester Connection Condition Specified Condition
        z2-2 (D+) - Body ground Ignition switch ON Below 1 V
        z2-1 (D-) - Body ground Ignition switch ON Below 1 V

      4. Turn the ignition switch off.

      5. Disconnect the cable from the negative (-) battery terminal.

        CAUTION:

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

    3. Check for an open in the circuit.


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

        Standard Resistance
        Tester Connection Condition Specified Condition
        z2-2 (D+) - z2-1 (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
        z2-2 (D+) - Body ground Always 1 MΩ or higher
        z2-1 (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
        z2-2 (D+) - z2-1 (D-) Always 1 MΩ or higher

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

      Result
      Proceed to
      OK
      NG

    NG

    CHECK INSTRUMENT PANEL WIRE Click here

    OK

  5. CHECK DTC


    1. B006XGOC01
      *1 Horn Button Assembly
      *2 Spiral Cable Sub-assembly
      *3 Airbag Sensor Assembly

      Connect the connectors to the horn button assembly and airbag sensor assembly.

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

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

    4. Clear the DTCs stored in memory.


      Body Electrical > SRS Airbag > Clear DTCs

    5. Turn the ignition switch off.

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

    7. Check for DTCs.


      Body Electrical > SRS Airbag > Trouble Codes
      OK
      DTC B1800, B1801, B1802 or B1803 is not output.

      Tech Tips

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

      Result
      Proceed to
      OK
      NG

    OK

    USE SIMULATION METHOD TO CHECK Click here

    NG

    REPLACE AIRBAG SENSOR ASSEMBLY Click here

  6. CHECK INSTRUMENT PANEL WIRE


    1. B006X8XC36
      *1 Horn Button Assembly
      *2 Spiral Cable Sub-assembly
      *3 Airbag Sensor Assembly
      *4 Instrument Panel Wire
      *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 (-) battery terminal.

      2. Turn the ignition switch to ON.

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

        Standard Voltage
        Tester Connection Condition Specified Condition
        K24-1 (D+) - Body ground Ignition switch ON Below 1 V
        K24-2 (D-) - Body ground Ignition switch ON Below 1 V

      4. Turn the ignition switch off.

      5. Disconnect the cable from the negative (-) battery terminal.

        CAUTION:

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

    3. Check for an open in the circuit.


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

        Standard Resistance
        Tester Connection Condition Specified Condition
        K24-1 (D+) - K24-2 (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
        K24-1 (D+) - Body ground Always 1 MΩ or higher
        K24-2 (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
        K24-1 (D+) - K24-2 (D-) Always 1 MΩ or higher

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

      Result
      Proceed to
      OK
      NG

    NG

    REPLACE INSTRUMENT PANEL WIRE

    OK

  7. CHECK SPIRAL CABLE SUB-ASSEMBLY


    1. B006XV7C17
      *1 Horn Button Assembly
      *2 Spiral Cable Sub-assembly
      *3 Airbag Sensor Assembly
      *4 Instrument Panel Wire
      *a

      Front view of wire harness connector

      (to Horn Button Assembly)
      *b Color: Light Green

      Check for a short to B+ in the circuit.


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

      2. Turn the ignition switch to ON.

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

        Standard Voltage
        Tester Connection Condition Specified Condition
        z2-2 (D+) - Body ground Ignition switch ON Below 1 V
        z2-1 (D-) - Body ground Ignition switch ON Below 1 V

      4. Turn the ignition switch off.

      5. Disconnect the cable from the negative (-) battery terminal.

        CAUTION:

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

    2. Check for an open in the circuit.


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

        Standard Resistance
        Tester Connection Condition Specified Condition
        z2-2 (D+) - z2-1 (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
        z2-2 (D+) - Body ground Always 1 MΩ or higher
        z2-1 (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
        z2-2 (D+) - z2-1 (D-) Always 1 MΩ or higher

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

      Result
      Proceed to
      OK
      NG

    OK

    USE SIMULATION METHOD TO CHECK Click here

    NG

    REPLACE SPIRAL CABLE SUB-ASSEMBLY Click here

  8. CHECK CONNECTORS


    1. B0070ZYC01
      *1 Horn Button Assembly
      *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 (-) battery terminal.

      CAUTION:

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

    3. Check that the connectors are properly connected to the horn button assembly, spiral cable sub-assembly and airbag sensor assembly.

      OK
      The connectors are properly connected.

      Tech Tips

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

    4. Disconnect the connectors from the horn button assembly, spiral cable sub-assembly and airbag sensor assembly.

    5. Check that the terminals of the connectors are not deformed or damaged.

      OK
      The terminals are not deformed or damaged.

    6. Check that the spiral cable sub-assembly connector (on the horn button assembly side) is not loose, deformed or damaged.

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

    7. Check that the short springs of the activation prevention mechanisms of the instrument panel wire connector and spiral cable sub-assembly connector are not deformed or damaged.

      OK
      The short springs are not deformed or damaged.
      Result
      Proceed to
      OK
      NG

    NG

    REPLACE WIRE HARNESS

    OK

  9. CHECK HORN BUTTON ASSEMBLY


    1. B006Z7HC15
      *1 Horn Button Assembly
      *2 Spiral Cable Sub-assembly
      *3 Airbag Sensor Assembly
      *a

      Front view of wire harness connector

      (to Horn Button Assembly)

      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 a tester to the horn button assembly 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 it.

      • 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 to ON, and wait for at least 60 seconds.

    5. Clear the DTCs stored in memory.


      Body Electrical > SRS Airbag > Clear DTCs

    6. Turn the ignition switch off.

    7. Turn the ignition switch to ON, and wait for at least 60 seconds.

    8. Check for DTCs.


      Body Electrical > SRS Airbag > Trouble Codes
      OK
      DTC B1800, B1801, B1802 or B1803 is not output.

      Tech Tips

      Codes other than DTCs B1800, B1801, B1802 and B1803 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 (-) battery terminal.

      CAUTION:

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

    11. Disconnect SST from connector E.

      Result
      Proceed to
      OK
      NG

    OK

    REPLACE HORN BUTTON ASSEMBLY Click here

    NG

  10. CHECK DRIVER SQUIB CIRCUIT


    1. B006Z5EC16
      *1 Horn Button Assembly
      *2 Spiral Cable Sub-assembly
      *3 Airbag Sensor Assembly
      *a

      Front view of wire harness connector

      (to Horn Button Assembly)

      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 (-) battery terminal.

      2. Turn the ignition switch to ON.

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

        Standard Voltage
        Tester Connection Condition Specified Condition
        z9-2 (D+) - Body ground Ignition switch ON Below 1 V
        z9-1 (D-) - Body ground Ignition switch ON Below 1 V

      4. Turn the ignition switch off.

      5. Disconnect the cable from the negative (-) battery terminal.

        CAUTION:

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

    3. Check for an open in the circuit.


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

        Standard Resistance
        Tester Connection Condition Specified Condition
        z9-2 (D+) - z9-1 (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
        z9-2 (D+) - Body ground Always 1 MΩ or higher
        z9-1 (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
        z9-2 (D+) - z9-1 (D-) Always 1 MΩ or higher

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

      Result
      Proceed to
      OK
      NG

    NG

    CHECK INSTRUMENT PANEL WIRE Click here

    OK

  11. CHECK DTC


    1. B006XGOC01
      *1 Horn Button Assembly
      *2 Spiral Cable Sub-assembly
      *3 Airbag Sensor Assembly

      Connect the connectors to the horn button assembly and airbag sensor assembly.

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

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

    4. Clear the DTCs stored in memory.


      Body Electrical > SRS Airbag > Clear DTCs

    5. Turn the ignition switch off.

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

    7. Check for DTCs.


      Body Electrical > SRS Airbag > Trouble Codes
      OK
      DTC B1800, B1801, B1802 or B1803 is not output.

      Tech Tips

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

      Result
      Proceed to
      OK
      NG

    OK

    USE SIMULATION METHOD TO CHECK Click here

    NG

    REPLACE AIRBAG SENSOR ASSEMBLY Click here

  12. CHECK INSTRUMENT PANEL WIRE


    1. B006X8XC36
      *1 Horn Button Assembly
      *2 Spiral Cable Sub-assembly
      *3 Airbag Sensor Assembly
      *4 Instrument Panel Wire
      *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 (-) battery terminal.

      2. Turn the ignition switch to ON.

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

        Standard Voltage
        Tester Connection Condition Specified Condition
        K24-1 (D+) - Body ground Ignition switch ON Below 1 V
        K24-2 (D-) - Body ground Ignition switch ON Below 1 V

      4. Turn the ignition switch off.

      5. Disconnect the cable from the negative (-) battery terminal.

        CAUTION:

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

    3. Check for an open in the circuit.


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

        Standard Resistance
        Tester Connection Condition Specified Condition
        K24-1 (D+) - K24-2 (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
        K24-1 (D+) - Body ground Always 1 MΩ or higher
        K24-2 (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
        K24-1 (D+) - K24-2 (D-) Always 1 MΩ or higher

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

      Result
      Proceed to
      OK
      NG

    NG

    REPLACE INSTRUMENT PANEL WIRE

    OK

  13. CHECK SPIRAL CABLE SUB-ASSEMBLY


    1. B006Y6PC16
      *1 Horn Button Assembly
      *2 Spiral Cable Sub-assembly
      *3 Airbag Sensor Assembly
      *4 Instrument Panel Wire
      *a

      Front view of wire harness connector

      (to Horn Button Assembly)

      Check for a short to B+ in the circuit.


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

      2. Turn the ignition switch to ON.

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

        Standard Voltage
        Tester Connection Condition Specified Condition
        z9-2 (D+) - Body ground Ignition switch ON Below 1 V
        z9-1 (D-) - Body ground Ignition switch ON Below 1 V

      4. Turn the ignition switch off.

      5. Disconnect the cable from the negative (-) battery terminal.

        CAUTION:

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

    2. Check for an open in the circuit.


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

        Standard Resistance
        Tester Connection Condition Specified Condition
        z9-2 (D+) - z9-1 (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
        z9-2 (D+) - Body ground Always 1 MΩ or higher
        z9-1 (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
        z9-2 (D+) - z9-1 (D-) Always 1 MΩ or higher

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

      Result
      Proceed to
      OK
      NG

    OK

    USE SIMULATION METHOD TO CHECK Click here

    NG

    REPLACE SPIRAL CABLE SUB-ASSEMBLY Click here