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

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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
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DESCRIPTION


DTC Code DTC Detection Condition Trouble Area
B1800/51

One of the following conditions is met:


  • The center airbag sensor receives 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 malfunction.

  • A center airbag sensor malfunction.

  • Instrument panel wire

  • Spiral cable sub-assembly

  • Steering pad (Driver side squib)

  • Center airbag sensor assembly
B1801/51

One of the following conditions is met:


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

  • A driver side squib malfunction.

  • A spiral cable malfunction.

  • A center airbag sensor malfunction.

  • Instrument panel wire

  • Spiral cable sub-assembly

  • Steering pad (Driver side squib)

  • Center airbag sensor assembly
B1802/51

One of the following conditions is met:


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

  • A driver side squib malfunction.

  • A spiral cable malfunction.

  • A center airbag sensor malfunction.

  • Instrument panel wire

  • Spiral cable sub-assembly

  • Steering pad (Driver side squib)

  • Center airbag sensor assembly
B1803/51

One of the following conditions is met:


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

  • A driver side squib malfunction.

  • A spiral cable malfunction.

  • A center airbag sensor malfunction.

  • Instrument panel wire

  • Spiral cable sub-assembly

  • Steering pad (Driver side squib)

  • Center airbag sensor assembly
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WIRING DIAGRAM

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INSPECTION PROCEDURE

Note:

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

  • After turning the ignition switch off, waiting time may be required before disconnecting the cable from the battery terminal. Therefore, make sure to read the disconnecting the cable from the battery terminal notice 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).

Tip:

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

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PROCEDURE


  1. Click here

    CHECK STEERING PAD (DRIVER SIDE SQUIB)


    1. A01IPFKE02

      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 steering pad.

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

      CAUTION:

      Never connect the tester 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 SST.

      • Insert SST straight into the terminals of the connector.

      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, B1801, B1802 or B1803 is not output.
      Tip:

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


  2. Click here

    CHECK CONNECTOR


    1. Turn the ignition switch off.

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

    3. Disconnect SST from connector E.

    4. Check that the spiral cable connectors (on the steering pad side) are not damaged.

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

  3. Click here

    CHECK DRIVER SIDE SQUIB CIRCUIT


    1. A01IS6DE02

      Disconnect the connectors from the center airbag sensor.

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

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      z9-1 - Body ground Ignition switch ON Below 1 V
      z9-2 - 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
      z9-1 - z9-2 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
      z9-1 - z9-2 Always 1 MΩ or higher
      z9-1 - Body ground Always 1 MΩ or higher
      z9-2 - Body ground Always 1 MΩ or higher

  4. Click here

    CHECK CENTER AIRBAG SENSOR


    1. A01IUPHE01

      Connect the connectors to the steering pad and center airbag sensor.

    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, B1801, B1802 or B1803 is not output.
      Tip:

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

      Table 1. Text in Illustration
      *1 Driver Side Squib
      *2 Spiral Cable
      *3 Center Airbag Sensor

  5. Click here

    CHECK INSTRUMENT PANEL WIRE (CENTER AIRBAG SENSOR - SPIRAL CABLE)


    1. A01INQLE01

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

    2. Disconnect the instrument panel wire connector from the spiral cable.

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

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      H12-1 (D+) - Body ground Ignition switch ON Below 1 V
      H12-2 (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
      H12-1 (D+) - H12-2 (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
      H12-1 (D+) - H12-2 (D-) Always 1 MΩ or higher
      H12-1 (D+) - Body ground Always 1 MΩ or higher
      H12-2 (D-) - Body ground Always 1 MΩ or higher
      Table 2. Text in Illustration
      *1 Spiral Cable
      *2 Instrument Panel Wire
      *3 Center Airbag Sensor
      *4

      Rear view of wire harness connector

      (to Spiral Cable)
      *5 Connector C

  6. Click here

    REPLACE STEERING PADClick here

  7. Click here

    REPLACE SPIRAL CABLE SUB-ASSEMBLYClick here

  8. Click here

    REPLACE CENTER AIRBAG SENSOR ASSEMBLYClick here

  9. Click here

    USE SIMULATION METHOD TO CHECKClick here

  10. Click here

    REPLACE INSTRUMENT PANEL WIRE