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 center airbag sensor 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 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 detects 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 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 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 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 malfunction.

  • A center airbag sensor malfunction.

  • Instrument panel wire

  • Spiral cable sub-assembly

  • Steering pad (Driver side squib)

  • Center airbag sensor assembly

WIRING DIAGRAM

B001EEIE01

CAUTION / NOTICE / HINT

Note


  • 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 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.

  • 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 intelligent tester (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 STEERING PAD (DRIVER SIDE SQUIB)


    1. B001FI9E01
      Text in Illustration
      *1 Driver Side Squib
      *2 Spiral Cable
      *3 Center Airbag Sensor
      *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 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.

      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, B1801, B1802 or B1803 is not output.

      Tech Tips

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


    OK

    REPLACE STEERING PAD Click here

    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 from connector E.

    4. B001HVWE02
      Text in Illustration
      *1 Driver Side Squib
      *2 Spiral Cable
      *3 Center Airbag Sensor

      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.

    NG

    REPLACE SPIRAL CABLE SUB-ASSEMBLY Click here

    OK

  3. CHECK DRIVER SIDE SQUIB CIRCUIT


    1. B001GQYE01
      Text in Illustration
      *1 Driver Side Squib
      *2 Spiral Cable
      *3 Center Airbag Sensor
      *4 Connector E
      *a

      Front view of wire harness connector

      (to Driver Side Squib)
      *b Color: Orange

      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
      z5-2 (D+) - Body ground Ignition switch ON Below 1 V
      z5-1 (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
      z5-2 (D+) - z5-1 (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
      z5-2 (D+) - z5-1 (D-) Always 1 MΩ or higher
      z5-2 (D+) - Body ground Always 1 MΩ or higher
      z5-1 (D-) - Body ground Always 1 MΩ or higher

    NG

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

    OK

  4. CHECK CENTER AIRBAG SENSOR


    1. B001GPCE09
      Text in Illustration
      *1 Driver Side Squib
      *2 Spiral Cable
      *3 Center Airbag Sensor

      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.

      Tech Tips

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


    OK

    USE SIMULATION METHOD TO CHECK Click here

    NG

    REPLACE CENTER AIRBAG SENSOR ASSEMBLY Click here

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


    1. B001CM7E01
      Text in Illustration
      *1 Instrument Panel Wire
      *2 Spiral Cable
      *3 Center Airbag Sensor
      *4 Connector C
      *a

      Rear view of wire harness connector

      (to Spiral Cable)

      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
      G41-1 (D+) - Body ground Ignition switch ON Below 1 V
      G41-2 (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
      G41-1 (D+) - G41-2 (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
      G41-1 (D+) - G41-2 (D-) Always 1 MΩ or higher
      G41-1 (D+) - Body ground Always 1 MΩ or higher
      G41-2 (D-) - Body ground Always 1 MΩ or higher

    OK

    REPLACE SPIRAL CABLE SUB-ASSEMBLY Click here

    NG

    REPLACE INSTRUMENT PANEL WIRE