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 Code DTC Detection Condition Trouble Area
B1800/51

One of the following conditions is met:


  • The airbag sensor assembly detects a line short circuit signal 5 times in the driver side squib circuit during the primary check.

  • A driver side squib malfunction.

  • A spiral cable sub-assembly malfunction.

  • An airbag sensor assembly malfunction.

  • Instrument panel wire

  • Spiral cable sub-assembly

  • Horn button assembly (Driver side squib)

  • Airbag sensor assembly
B1801/51

One of the following conditions is met:


  • The airbag sensor assembly detects an open circuit signal in the driver side squib circuit for 2 seconds.

  • A driver side squib malfunction.

  • A spiral cable sub-assembly malfunction.

  • An airbag sensor assembly malfunction.
B1802/51

One of the following conditions is met:


  • The airbag sensor assembly detects a short circuit to ground signal in the driver side squib circuit for 0.5 seconds.

  • A driver side squib malfunction.

  • A spiral cable sub-assembly malfunction.

  • An airbag sensor assembly malfunction.
B1803/51

One of the following conditions is met:


  • The airbag sensor assembly detects a short circuit to B+ signal in the driver side squib circuit for 0.5 seconds.

  • A driver side squib malfunction.

  • A spiral cable sub-assembly malfunction.

  • An airbag sensor assembly malfunction.

WIRING DIAGRAM

A0054Z0E33

CAUTION / NOTICE / HINT

Note


  • When installing the spiral cable sub-assembly and steering wheel, be sure to adjust the spiral cable sub-assembly as it may break if the steering wheel is turned before adjusting the spiral cable sub-assembly Click here.

  • 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.

  • When disconnecting the cable from the negative (-) battery terminal while performing repairs, some systems need to be initialized after the cable is reconnected Click here.

Tech Tips

To perform the simulation method, enter check mode (signal check) with the GTS (See page ), and then wiggle each connector of the airbag system or drive the vehicle on various types of road Click here.

PROCEDURE


  1. CHECK HORN BUTTON ASSEMBLY (DRIVER SIDE SQUIB)


    1. A00530PE02
      Text in Illustration
      *1 Driver Side Squib
      *2 Spiral Cable Sub-assembly
      *3 Airbag Sensor Assembly
      *4 Connector E
      *5 SST
      *a

      Front view of wire harness connector

      (to Driver Side Squib)
      *b Color: Orange

      Turn the ignition switch off.

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

    3. Disconnect the connectors from the horn button assembly.

    4. Connect the white wire side of SST (resistance: 2.1 Ω) to connector E (orange connector).

      CAUTION:

      Never connect the tester to the horn button assembly (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 SST.

      • Insert SST straight into the terminals of the connector.

      SST
      09843-18061

    5. Connect the cable to the negative (-) battery terminal, and wait for at least 2 seconds.

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

    7. Clear the DTCs Click here.

    8. Turn the ignition switch off.

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

    10. Check for DTCs Click here.

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

      Tech Tips

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

    11. Turn the ignition switch off.

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

    13. Disconnect SST from connector E.


    OK

    REPLACE HORN BUTTON ASSEMBLY Click here

    NG

  2. CHECK CONNECTORS


    1. Disconnect the connectors from the airbag sensor assembly.

    2. A0052IPE01
      Text in Illustration
      *1 Driver Side Squib
      *2 Spiral Cable Sub-assembly
      *3 Airbag Sensor Assembly

      Check that the connectors (on the airbag sensor assembly side and horn button assembly side) are not damaged.

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

    NG

    REPLACE HARNESS AND CONNECTOR

    OK

  3. CHECK DRIVER SIDE SQUIB CIRCUIT


    1. A005849E02
      Text in Illustration
      *1 Driver Side Squib
      *2 Spiral Cable Sub-assembly
      *3 Airbag Sensor Assembly
      *4 Connector E
      *a

      Front view of wire harness connector

      (to Driver Side Squib)
      *b Color: Orange

      Connect the cable to the negative (-) battery terminal, and wait for at least 2 seconds.

    2. Turn the ignition switch to ON.

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      z4-2 (D+) - Body ground Ignition switch ON Below 1 V
      z4-1 (D-) - Body ground Ignition switch ON Below 1 V

    4. Turn the ignition switch off.

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

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      z4-2 (D+) - z4-1 (D-) Always Below 1 Ω

    7. Release the activation prevention mechanism built into connector B Click here.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      z4-2 (D+) - z4-1 (D-) Always 1 MΩ or higher
      z4-2 (D+) - Body ground Always 1 MΩ or higher
      z4-1 (D-) - Body ground Always 1 MΩ or higher

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


    NG

    CHECK INSTRUMENT PANEL WIRE Click here

    OK

  4. CHECK FOR DTC


    1. A0057Z5E17
      Text in Illustration
      *1 Driver Side Squib
      *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, and wait for at least 2 seconds.

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

    4. Clear the DTCs Click here.

    5. Turn the ignition switch off.

    6. Turn the ignition switch to ON, 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 DTC B1800/51, B1801/51, B1802/51 and B1803/51 may be output at this time, but they are not related to this check.


    OK

    USE SIMULATION METHOD TO CHECK Click here

    NG

    REPLACE AIRBAG SENSOR ASSEMBLY Click here

  5. CHECK INSTRUMENT PANEL WIRE


    1. A0055AZE01
      Text in Illustration
      *1 Instrument Panel Wire
      *2 Spiral Cable Sub-assembly
      *3 Airbag Sensor Assembly
      *4 Connector C
      *a

      Rear view of wire harness connector

      (to Spiral Cable Sub-assembly)

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

    2. Connect the cable to the negative (-) battery terminal, and wait for at least 2 seconds.

    3. Turn the ignition switch to ON.

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      D6-1 (D+) - Body ground Ignition switch ON Below 1 V
      D6-2 (D-) - Body ground Ignition switch ON Below 1 V

    5. Turn the ignition switch off.

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

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      D6-1 (D+) - D6-2 (D-) Always Below 1 Ω

    8. Release the activation prevention mechanism built into connector B Click here.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      D6-1 (D+) - D6-2 (D-) Always 1 MΩ or higher
      D6-1 (D+) - Body ground Always 1 MΩ or higher
      D6-2 (D-) - Body ground Always 1 MΩ or higher

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


    OK

    REPLACE SPIRAL CABLE SUB-ASSEMBLY Click here

    NG

    REPLACE INSTRUMENT PANEL WIRE