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 Detection Condition Trouble Area
B1800/51

When one of following conditions is met:


  • Center airbag sensor assembly detects line short circuit signal in driver side squib circuit 5 times during primary check

  • Driver side squib malfunction

  • Spiral cable malfunction

  • Center airbag sensor assembly malfunction

  • Instrument panel wire

  • Spiral cable

  • Steering pad (Driver side squib)

  • Center airbag sensor assembly
B1801/51

When one of following conditions is met:


  • Center airbag sensor assembly detects open circuit signal in driver side squib circuit for 2 seconds

  • Driver side squib malfunction

  • Spiral cable malfunction

  • Center airbag sensor assembly malfunction

  • Instrument panel wire

  • Spiral cable

  • Steering pad (Driver side squib)

  • Center airbag sensor assembly
B1802/51

When one of following conditions is met:


  • Center airbag sensor assembly detects short circuit to ground signal in driver side squib circuit for 0.5 seconds

  • Driver side squib malfunction

  • Spiral cable malfunction

  • Center airbag sensor assembly malfunction

  • Instrument panel wire

  • Spiral cable

  • Steering pad (Driver side squib)

  • Center airbag sensor assembly
B1803/51

When one of following conditions is met:


  • Center airbag sensor assembly detects short circuit to B+ signal in driver side squib circuit for 0.5 seconds

  • Driver side squib malfunction

  • Spiral cable malfunction

  • Center airbag sensor assembly malfunction

  • Instrument panel wire

  • Spiral cable

  • Steering pad (Driver side squib)

  • Center airbag sensor assembly

WIRING DIAGRAM

A011B60E01

INSPECTION PROCEDURE

Tech Tips


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

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

PROCEDURE


  1. 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 the connector from the steering pad.

    4. Check the spiral cable connector and terminals (on the steering pad side) and check that the connector is properly connected to the steering pad.

      Result
      Result Proceed to
      No problem. A
      Connector or terminals incorrect. B
      Connector connected improperly. C

    B

    REPLACE SPIRAL CABLE Click here

    C

    CONNECT CONNECTOR PROPERLY

    A

  2. INSPECT STEERING PAD (DRIVER SIDE SQUIB)

    SST
    09843-18061

    1. A011BATE01
      Text in Illustration
      *1 Driver Side Squib
      *2 Spiral Cable
      *3 Center Airbag Sensor Assembly
      *4

      Front view of wire harness connector

      (to Driver Side Squib)
      *5 Connector E
      *6 Color: Orange
      *7 Front view of DLC3
      *8 DTC 51

      Disconnect the connector from the steering pad.

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

      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 SST into the terminals of the connector when connecting.

      • Insert SST straight into the terminals of the connector.

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

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

    5. Clear the DTCs stored in the memory Click here.

    6. Turn the ignition switch off.

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

    8. Turn the steering wheel lock to lock 5 times or more.

    9. Check the DTCs Click here.

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

      Tech Tips

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


    NG

    CHECK CONNECTOR Click here

    OK

    REPLACE STEERING PAD Click here

  3. 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 the SST from connector E.

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

    5. Check the instrument panel wire connector and terminals (on the spiral cable side) and check that the connector is properly connected to the spiral cable.

      Result
      Result Proceed to
      No problem. A
      Connector or terminals incorrect. B
      Connector connected improperly. C

    B

    REPLACE INSTRUMENT PANEL WIRE

    C

    CONNECT CONNECTOR PROPERLY

    A

  4. CHECK SPIRAL CABLE (DRIVER SIDE SQUIB - INSTRUMENT PANEL WIRE)


    1. A0117SJE03
      Text in Illustration
      *1 Driver Side Squib
      *2 Spiral Cable
      *3 Instrument Panel Wire
      *4 Center Airbag Sensor Assembly
      *5

      Front view of wire harness connector

      (to Driver Side Squib)
      *6 Connector E
      *7 Color: Orange

      Disconnect the instrument panel wire connector from the spiral cable.

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


      1. 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
        1 (D-) - Body ground Ignition switch ON Below 1 V
        2 (D+) - Body ground Ignition switch ON Below 1 V

    3. Check for open in the circuit.


      1. Turn the ignition switch off.

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

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

        Standard Resistance
        Tester Connection Condition Specified Condition
        1 (D-) - 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.

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

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

      3. Restore the released activation prevention mechanism of connector D to the original condition.


    NG

    REPLACE SPIRAL CABLE Click here

    OK

  5. CHECK CONNECTOR


    1. Disconnect the instrument panel wire connector from the center airbag sensor assembly.

    2. Check the instrument panel wire connector and terminals (on the center airbag sensor assembly side) and check that the connector is properly connected to the center airbag sensor assembly.

      Result
      Result Proceed to
      No problem. A
      Connector or terminals incorrect. B
      Connector connected improperly. C

    B

    REPLACE INSTRUMENT PANEL WIRE

    C

    CONNECT CONNECTOR PROPERLY

    A

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


    1. A0116X3E03
      Text in Illustration
      *1 Driver Side Squib
      *2 Spiral Cable
      *3 Instrument Panel Wire
      *4 Center Airbag Sensor Assembly
      *5

      Rear view of wire harness connector

      (to Spiral Cable)
      *6 Connector C

      Disconnect the instrument panel wire connector from the center airbag sensor assembly.

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


      1. 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

        D44-1 (D+) -

        Body ground

        		 Ignition switch ON Below 1 V

        D44-2 (D-) -

        Body ground

        		 Ignition switch ON Below 1 V

    3. Check for open in the circuit.


      1. Turn the ignition switch off.

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

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

        Standard Resistance
        Tester Connection Condition Specified Condition
        D44-1 (D+) - D44-2 (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.

        Standard Resistance
        Tester Connection Condition Specified Condition

        D44-1 (D+) -

        Body ground

        		 Always 1 MΩ or higher

        D44-2 (D-) -

        Body ground

        		 Always 1 MΩ or higher

    5. Check for short in the circuit.


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

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

        Standard Resistance
        Tester Connection Condition Specified Condition
        D44-1 (D+) - D44-2 (D-) Always 1 MΩ or higher

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


    NG

    REPLACE INSTRUMENT PANEL WIRE

    OK

  7. CHECK CENTER AIRBAG SENSOR ASSEMBLY


    1. A011ABXE09
      Text in Illustration
      *1 Driver Side Squib
      *2 Spiral Cable
      *3 Center Airbag Sensor Assembly
      *4 Front view of DLC3
      *5 DTC 51

      Connect the connectors to the steering pad, spiral cable and the center 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 stored in the memory Click here.

    5. Turn the ignition switch off.

    6. Turn the ignition switch to ON, 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

      DTCs other than 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 Click here

    OK

    USE SIMULATION METHOD TO CHECK Click here