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 No. DTC Detecting Condition Trouble Area
B1800/51

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

  • Driver side squib malfunction

  • Spiral cable malfunction

  • Center airbag sensor assembly malfunction

  • Engine room main wire

  • Instrument panel wire

  • Spiral cable

  • Steering pad (Driver side squib)

  • Center airbag sensor assembly
B1801/51

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

  • Driver side squib malfunction

  • Spiral cable malfunction

  • Center airbag sensor assembly malfunction

  • Engine room main wire

  • Instrument panel wire

  • Spiral cable

  • Steering pad (Driver side squib)

  • Center airbag sensor assembly
B1802/51

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

  • Driver side squib malfunction

  • Spiral cable malfunction

  • Center airbag sensor assembly malfunction

  • Engine room main wire

  • Instrument panel wire

  • Spiral cable

  • Steering pad (Driver side squib)

  • Center airbag sensor assembly
B1803/51

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

  • Driver side squib malfunction

  • Spiral cable malfunction

  • Center airbag sensor assembly malfunction

  • Engine room main wire

  • Instrument panel wire

  • Spiral cable

  • Steering pad (Driver side squib)

  • Center airbag sensor assembly

WIRING DIAGRAM

A01BEWTE01

INSPECTION PROCEDURE

Tech Tips


  • Perform the simulation method by selecting the "check mode" (signal check) with the intelligent tester Click here.

  • After selecting the "check mode" (signal check), perform the simulation method by wiggling each connector of the airbag system or driving the vehicle on a city or rough road Click here.

PROCEDURE


  1. CHECK STEERING PAD (DRIVER SIDE SQUIB)


    1. A01BFL6E01

      Turn the ignition switch to the LOCK position.

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

    3. Disconnect the connector from the steering pad.

    4. Connect the white wire side of SST (resistance 2.1 Ω) to connector "G".

      CAUTION:

      Never connect a 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 the SST into the terminals of the connector.

      • Insert the SST straight into the terminals of the connector.

      SST
      09843-18060

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

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

    7. Clear the DTCs stored in memory Click here.

    8. Turn the ignition switch to the LOCK position.

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

    10. Check the DTCs Click here.

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

      Tech Tips

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


    OK

    REPLACE STEERING PAD

    NG

  2. CHECK CONNECTOR


    1. Turn the ignition switch to the LOCK position.

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

    3. Disconnect the SST from connector "G".

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

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

    NG

    REPLACE SPIRAL CABLE

    OK

  3. CHECK DRIVER SIDE SQUIB CIRCUIT


    1. A01BAD3E01

      Disconnect the connectors from the center airbag sensor assembly.

    2. Check for short to B+ in the circuit.


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

      2. Turn the ignition switch to the ON position.

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

        Voltage
        Tester connection Condition Specified condition
        D+ - Body ground Ignition switch ON Below 1 V
        D- - Body ground Ignition switch ON Below 1 V

    3. Check for open in the circuit.


      1. Turn the ignition switch to the LOCK position.

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

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

        Resistance
        Tester connection Condition Specified condition
        D+ - D- Always Below 1 Ω

    4. Check for short to ground in the circuit.


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

        Resistance
        Tester connection Condition Specified condition
        D+ - Body ground Always 1 MΩ or higher
        D- - Body ground Always 1 MΩ or higher

    5. Check for 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.

        Resistance
        Tester connection Condition Specified condition
        D+ - D- Always 1 MΩ or higher

    NG

    CHECK ENGINE ROOM MAIN WIRE Click here

    OK

  4. CHECK CENTER AIRBAG SENSOR ASSEMBLY


    1. A01BFRPE01

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

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

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

    4. Clear the DTCs stored in memory Click here.

    5. Turn the ignition switch to the LOCK position.

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

    7. Check the DTCs Click here.

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

      Tech Tips

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


    NG

    REPLACE CENTER AIRBAG SENSOR ASSEMBLY

    OK

    USE SIMULATION METHOD TO CHECK

  5. CHECK ENGINE ROOM MAIN WIRE


    1. A01BAV7E01

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

    2. Disconnect the engine room main wire connector from the instrument panel wire.

    3. Check for short to B+ in the circuit.


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

      2. Turn the ignition switch to the ON position.

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

        Voltage
        Tester connection Condition Specified condition

        HB3-1 (D+) -

        Body ground

        		 Ignition switch ON Below 1 V

        HB3-3 (D-) -

        Body ground

        		 Ignition switch ON Below 1 V

    4. Check for open in the circuit.


      1. Turn the ignition switch to the LOCK position.

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

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

        Resistance
        Tester connection Condition Specified condition
        HB3-1 (D+) - HB3-3 (D-) Always Below 1 Ω

    5. Check for short to ground in the circuit.


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

        Resistance
        Tester connection Condition Specified condition

        HB3-1 (D+) -

        Body ground

        		 Always 1 MΩ or higher

        HB3-3 (D-) -

        Body ground

        		 Always 1 MΩ or higher

    6. Check for short to ground 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.

        Resistance
        Tester connection Condition Specified condition
        HB3-1 (D+) - HB3-3 (D-) Always 1 MΩ or higher

    NG

    REPAIR OR REPLACE ENGINE ROOM MAIN WIRE

    OK

  6. CHECK INSTRUMENT PANEL WIRE


    1. A01BEAEE01

      Disconnect the instrument panel wire connector from the spiral cable.

    2. Check for short to B+ in the circuit.


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

      2. Turn the ignition switch to the ON position.

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

        Voltage
        Tester connection Condition Specified condition

        H32-1 (D+) -

        Body ground

        		 Ignition switch ON Below 1 V

        H32-2 (D-) -

        Body ground

        		 Ignition switch ON Below 1 V

    3. Check for open in the circuit.


      1. Turn the ignition switch to the LOCK position.

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

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

        Resistance
        Tester connection Condition Specified condition
        H32-1 (D+) - H32-2 (D-) Always Below 1 Ω

    4. Check for short to ground in the circuit.


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

        Resistance
        Tester connection Condition Specified condition

        H32-1 (D+) -

        Body ground

        		 Always 1 MΩ or higher

        H32-2 (D-) -

        Body ground

        		 Always 1 MΩ or higher

    5. Check for 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.

        Resistance
        Tester connection Condition Specified condition
        H32-1 (D+) - H32-2 (D-) Always 1 MΩ or higher

    NG

    REPAIR OR REPLACE INSTRUMENT PANEL WIRE

    OK

  7. CHECK SPIRAL CABLE


    1. A01BDGQE01

      Check for short to B+ in the circuit.


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

      2. Turn the ignition switch to the ON position.

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

        Voltage
        Tester connection Condition Specified condition
        D+ - Body ground Ignition switch ON Below 1 V
        D- - Body ground Ignition switch ON Below 1 V

    2. Check for open in the circuit.


      1. Turn the ignition switch to the LOCK position.

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

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

        Resistance
        Tester connection Condition Specified condition
        D+ - D- Always Below 1 Ω

    3. Check for short to ground in the circuit.


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

        Resistance
        Tester connection Condition Specified condition
        D+ - Body ground Always 1 MΩ or higher
        D- - Body ground Always 1 MΩ or higher

    4. Check for short in the circuit.


      1. Release the activation prevention mechanism built into connector "F" Click here.

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

        Resistance
        Tester connection Condition Specified condition
        D+ - D- Always 1 MΩ or higher

    NG

    REPLACE SPIRAL CABLE

    OK

    USE SIMULATION METHOD TO CHECK