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

  • The center airbag sensor assembly receives a line short circuit signal in the driver side squib circuit 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

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

  • 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

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

  • 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

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

  • 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

A01NDVRE01

INSPECTION PROCEDURE

Tech Tips


  • Perform the simulation method by selecting check mode (Signal Check) using 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 or rough road Click here.

PROCEDURE


  1. CHECK CONNECTORS


    1. A01NHCFE01
      Text in Illustration
      *1 Driver Side Squib
      *2 Spiral Cable
      *3 Center Airbag Sensor Assembly
      *4 Instrument Panel Wire

      Turn the power switch off.

    2. Disconnect the cable from the negative (-) battery terminal.

      Note

      Wait at least 90 seconds after disconnecting the cable from the negative (-) battery terminal to disable the SRS system.

    3. Check that the connectors are properly connected to the steering pad, spiral cable and center airbag sensor assembly.

      OK
      The connectors are properly connected.

      Tech Tips

      If the connectors are not connected securely, reconnect the connectors and proceed to the next inspection.

    4. Disconnect the connectors from the steering pad, spiral cable and center airbag sensor assembly.

    5. Check that the terminals of the connectors are not damaged.

      OK
      The terminals are not deformed or damaged.

    6. 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.

    7. Check that the short springs for the instrument panel wire and spiral cable with the activation prevention mechanism are not deformed or damaged.

      OK
      The short springs are not deformed or damaged.

    NG

    REPLACE WIRE HARNESS

    OK

  2. CHECK STEERING PAD (DRIVER SIDE SQUIB)


    1. A01NGQ9E01
      Text in Illustration
      *1 Driver Side Squib
      *2 Spiral Cable
      *3 Center Airbag Sensor Assembly
      *4

      Front view of wire harness connector

      (to Steering Pad)
      *5 Connector E
      *6 Color: Orange

      Connect the instrument panel wire to the center airbag sensor assembly and spiral cable.

    2. Connect 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.

      • Insert SST straight into the terminals of the connector.

      SST
      09843-18061

    3. Connect the cable to the negative (-) battery terminal.

    4. Turn the power switch on (IG), and wait for at least 60 seconds.

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

    6. Turn the power switch off.

    7. Turn the power switch on (IG), and wait for at least 60 seconds.

    8. Check for 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

    CHECK DRIVER SIDE SQUIB CIRCUIT Click here

    OK

    REPLACE STEERING PAD Click here

  3. CHECK DRIVER SIDE SQUIB CIRCUIT


    1. A01NHEFE01
      Text in Illustration
      *1 Driver Side Squib
      *2 Spiral Cable
      *3 Center Airbag Sensor Assembly
      *4

      Front view of wire harness connector

      (to Steering Pad)
      *5 Connector E
      *6 Color: Orange

      Turn the power switch off.

    2. Disconnect the cable from the negative (-) battery terminal.

      Note

      Wait at least 90 seconds after disconnecting the cable from the negative (-) battery terminal to disable the SRS system.

    3. Disconnect SST from connector E.

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

    5. Check for a short to B+ in the circuit.


      1. Connect the cable to the negative (-) battery terminal.

      2. Turn the power switch on (IG).

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

        Standard Voltage
        Tester Connection Switch Condition Specified Condition
        z7-2 (D+) - Body ground Power switch on (IG) Below 1 V
        z7-1 (D-) - Body ground Power switch on (IG) Below 1 V

    6. Check for an open in the circuit.


      1. Turn the power switch off.

      2. Disconnect the cable from the negative (-) battery terminal.

        Note

        Wait at least 90 seconds after disconnecting the cable from the negative (-) battery terminal to disable the SRS system.

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

        Standard Resistance
        Tester Connection Condition Specified Condition
        z7-2 (D+) - z7-1 (D-) Always Below 1 Ω

    7. Check for a 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
        z7-2 (D+) - Body ground Always 1 MΩ or higher
        z7-1 (D-) - Body ground Always 1 MΩ or higher

    8. Check for a 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
        z7-2 (D+) - z7-1 (D-) Always 1 MΩ or higher

    NG

    CHECK INSTRUMENT PANEL WIRE Click here

    OK

  4. CHECK CENTER AIRBAG SENSOR ASSEMBLY


    1. A01NEMKE01
      Text in Illustration
      *1 Driver Side Squib
      *2 Spiral Cable
      *3 Center Airbag Sensor Assembly

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

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

    3. Connect the cable to the negative (-) battery terminal.

    4. Turn the power switch on (IG), and wait for at least 60 seconds.

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

    6. Turn the power switch off.

    7. Turn the power switch on (IG), and wait for at least 60 seconds.

    8. Check for 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 Click here

    OK

    USE SIMULATION METHOD TO CHECK Click here

  5. CHECK INSTRUMENT PANEL WIRE


    1. A01NGQTE01
      Text in Illustration
      *1 Driver Side Squib
      *2 Spiral Cable
      *3 Center Airbag Sensor Assembly
      *4 Instrument Panel Wire
      *5

      Front view of wire harness connector

      (to Spiral Cable)
      *6 Connector C

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

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

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


      1. Connect the cable to the negative (-) battery terminal.

      2. Turn the power switch on (IG).

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

        Standard Voltage
        Tester Connection Switch Condition Specified Condition
        F41-1 (D+) - Body ground Power switch on (IG) Below 1 V
        F41-2 (D-) - Body ground Power switch on (IG) Below 1 V

    4. Check for an open in the circuit.


      1. Turn the power switch off.

      2. Disconnect the cable from the negative (-) battery terminal.

        Note

        Wait at least 90 seconds after disconnecting the cable from the negative (-) battery terminal to disable the SRS system.

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

        Standard Resistance
        Tester Connection Condition Specified Condition
        F41-1 (D+) - F41-2 (D-) Always Below 1 Ω

    5. Check for a 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
        F41-1 (D+) - Body ground Always 1 MΩ or higher
        F41-2 (D-) - Body ground Always 1 MΩ or higher

    6. Check for a 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
        F41-1 (D+) - F41-2 (D-) Always 1 MΩ or higher

    NG

    REPLACE INSTRUMENT PANEL WIRE

    OK

  6. CHECK SPIRAL CABLE


    1. A01NGZBE01
      Text in Illustration
      *1 Driver Side Squib
      *2 Spiral Cable
      *3 Center Airbag Sensor Assembly
      *4 Instrument Panel Wire
      *5

      Front view of wire harness connector

      (to Steering Pad)
      *6 Connector E
      *7 Color: Orange

      Check for a short to B+ in the circuit.


      1. Connect the cable to the negative (-) battery terminal.

      2. Turn the power switch on (IG).

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

        Standard Voltage
        Tester Connection Switch Condition Specified Condition
        z7-2 (D+) - Body ground Power switch on (IG) Below 1 V
        z7-1 (D-) - Body ground Power switch on (IG) Below 1 V

    2. Check for an open in the circuit.


      1. Turn the power switch off.

      2. Disconnect the cable from the negative (-) battery terminal.

        Note

        Wait at least 90 seconds after disconnecting the cable from the negative (-) battery terminal to disable the SRS system.

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

        Standard Resistance
        Tester Connection Condition Specified Condition
        z7-2 (D+) - z7-1 (D-) Always Below 1 Ω

    3. Check for a 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
        z7-2 (D+) - Body ground Always 1 MΩ or higher
        z7-1 (D-) - Body ground Always 1 MΩ or higher

    4. Check for a 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
        z7-2 (D+) - z7-1 (D-) Always 1 MΩ or higher

    NG

    REPLACE SPIRAL CABLE Click here

    OK

    USE SIMULATION METHOD TO CHECK Click here