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

SYSTEM DESCRIPTION

The driver squib circuit consists of the center airbag sensor, spiral cable and steering pad. The circuit instructs the SRS to deploy when deployment conditions are met. These DTCs are recorded when a malfunction is detected in the driver squib circuit.

DTC No. DTC Detection Condition Trouble Area
B1800/51 Center airbag sensor assembly receives line short circuit signal 5 times in driver squib circuit during primary check

  • Steering pad (driver squib)

  • Spiral cable

  • Center airbag sensor assembly

  • Instrument panel wire
B1801/51 Center airbag sensor assembly receives open circuit signal in driver squib circuit for 2 seconds

  • Steering pad (driver squib)

  • Spiral cable

  • Center airbag sensor assembly

  • Instrument panel wire
B1802/51 Center airbag sensor assembly receives short circuit to ground signal in driver squib circuit for 0.5 seconds

  • Steering pad (driver squib)

  • Spiral cable

  • Center airbag sensor assembly

  • Instrument panel wire
B1803/51 Center airbag sensor assembly receives B+ short circuit signal in driver squib circuit for 0.5 seconds

  • Steering pad (driver squib)

  • Spiral cable

  • Center airbag sensor assembly

  • Instrument panel wire

WIRING DIAGRAM

A01DV0GE01

INSPECTION PROCEDURE

PROCEDURE


  1. CHECK STEERING PAD (DRIVER SQUIB)

    A01E274E02

    1. 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 the spiral cable connector E.

      SST
      09843-18060

      CAUTION:

      Never connect a tester to the steering pad (driver 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 terminal of the connector.

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

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

    7. Clear the DTCs stored in memory Click here.

    8. Turn the ignition switch OFF.

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

    10. Check for DTCs Click here.

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

      Tech Tips

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


    OK

    REPLACE STEERING PAD (DRIVER SQUIB)

    NG

  2. 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 (resistance 2.1 Ω) from the spiral cable.

    4. Check that the spiral cable connector (on the steering pad side) is not damaged.

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

    NG

    REPLACE SPIRAL CABLE

    OK

  3. CHECK DRIVER SQUIB CIRCUIT

    A01E0ALE02

    1. Disconnect the connector from the center airbag sensor.

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

    3. Turn the ignition switch ON.

    4. Measure the voltage of the wire harness side connector.

      Standard voltage
      Tester Connection Specified Condition
      D+ - Body ground Below 1 V
      D- - Body ground 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 of the wire harness side connector.

      Standard resistance
      Tester Connection Specified Condition
      D+ - D- Below 1 Ω
      D+ - Body ground 1 MΩ or higher
      D- - Body ground 1 MΩ or higher

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

    9. Measure the resistance of the wire harness side connector.

      Standard resistance
      Tester Connection Specified Condition
      D+ - D- 1 MΩ or higher

    OK

    REPLACE CENTER AIRBAG SENSOR ASSEMBLY

    NG

  4. CHECK INSTRUMENT PANEL WIRE

    A01DZ35E02

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

    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. Turn the ignition switch ON.

    5. Measure the voltage of the wire harness side connector.

      Standard voltage
      Tester Connection Specified Condition
      A15-1 (D+) - Body ground Below 1 V
      A15-2 (D-) - Body ground Below 1 V

    6. Turn the ignition switch OFF.

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

    8. Measure the resistance of the wire harness side connector.

      Standard resistance
      Tester Connection Specified Condition
      A15-1 (D+) - A15-2 (D-) Below 1 Ω
      A15-1 (D+) - Body ground 1 MΩ or higher
      A15-2 (D-) - Body ground 1 MΩ or higher

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

    10. Measure the resistance of the wire harness side connector.

      Standard resistance
      Tester Connection Specified Condition
      A15-1 (D+) - A15-2 (D-) 1 MΩ or higher

    NG

    REPAIR OR REPLACE INSTRUMENT PANEL WIRE

    OK

    REPLACE SPIRAL CABLE