AIRBAG SYSTEM, Diagnostic DTC:B1800, B1801, B1802, B1803

DTC Code DTC Name
B1800 Short in Driver Squib Circuit
B1801 Open in Driver Squib Circuit
B1802 Short to GND in Driver Side Squib Circuit
B1803 Short to B+ in Driver Side Squib Circuit

DESCRIPTION

The D squib circuit consists of the center airbag sensor assembly, the spiral cable and the steering pad.

The circuit signals the SRS to deploy when airbag deployment conditions are met.

These DTCs are set when a malfunction is detected in the D squib circuit.

DTC No. DTC Detecting Conditions Trouble Areas
B1800

  • Center airbag sensor assembly receives line short circuit signal in D squib circuit 5 times during check

  • D squib malfunction

  • Spiral cable malfunction

  • Center airbag sensor assembly malfunction

  • Instrument panel wire

  • Spiral cable

  • Steering pad (D squib)

  • Center airbag sensor assembly
B1801

  • Center airbag sensor assembly receives open circuit signal in D squib circuit for 2 seconds

  • D squib malfunction

  • Spiral cable malfunction

  • Center airbag sensor assembly malfunction

  • Instrument panel wire

  • Spiral cable

  • Steering pad (D squib)

  • Center airbag sensor assembly
B1802

  • Center airbag sensor assembly receives short circuit to ground signal in D squib circuit for 0.5 seconds

  • D squib malfunction

  • Spiral cable malfunction

  • Center airbag sensor assembly malfunction

  • Instrument panel wire

  • Spiral cable

  • Steering pad (D squib)

  • Center airbag sensor assembly
B1803

  • Center airbag sensor assembly receives short circuit to B+ signal in D squib circuit for 0.5 seconds

  • D squib malfunction

  • Spiral cable malfunction

  • Center airbag sensor assembly malfunction

  • Instrument panel wire

  • Spiral cable

  • Steering pad (D squib)

  • Center airbag sensor assembly

WIRING DIAGRAM

A0137W1E03

INSPECTION PROCEDURE

Tech Tips

Perform a check mode inspection after repairing the squib system to check if the repair has done correctly Click here.

PROCEDURE


  1. CHECK STEERING PAD (D SQUIB)

    SST
    09843-18060

    1. Turn the ignition switch to the LOCK position.

    2. A0137N3E01

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

      CAUTION:

      Never connect a tester to the horn button assembly (D 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 when connecting.

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

    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 and B1803 are not output.

    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. Check that the spiral cable connectors (on the steering pad side) are not damaged Click here.

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

    NG

    REPLACE SPIRAL CABLE

    OK

  3. CHECK CONNECTION OF CONNECTOR


    1. Check that the spiral cable connectors (on the steering pad side) are properly connected.

      OK
      The connectors are properly connected.

    NG

    CONNECT CONNECTOR

    OK

  4. CHECK SPIRAL CABLE


    1. A0137JCE01

      Disconnect the spiral cable connectors from the instrument panel wire and steering pad.

    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.

    4. Measure the voltage.

      Standard Voltage
      Tester Connection Condition Specified Condition
      D+ - Body ground Ignition switch ON Below 1 V
      D- -Body ground Ignition switch ON Below 1 V

    5. Turn the ignition switch to the LOCK position

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

    7. Measure the resistance.

      Standard Resistance
      Tester Connection Condition Specified Condition
      D+ - D- Always Below 1 Ω
      D+ - Body ground Always 1 MΩ or Higher
      D- - Body ground Always 1 MΩ or Higher

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

    9. Measure the resistance.

      Standard Resistance
      Tester Connection Condition Specified Condition
      D+ - D- Always 1 MΩ or Higher

    NG

    REPLACE SPIRAL CABLE

    OK

  5. CHECK INSTRUMENT PANEL WIRE (D SQUIB CIRCUIT)


    1. A0138XBE01

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

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

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

    4. Turn the ignition switch to the ON position.

    5. Measure the voltage.

      Standard Voltage
      Tester Connection Condition Specified Condition

      C21-1 (D+) -

      Body ground

      		 Ignition switch ON Below 1 V

      C21-2 (D-) -

      Body ground

      		 Ignition switch ON Below 1 V

    6. Turn the ignition switch to the LOCK position.

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

    8. Measure the resistance.

      Standard Resistance
      Tester Connection Condition Specified Condition
      C21-1 (D+) - C21-2 (D-) Always Below 1 Ω

      C21-1 (D+) -

      Body ground

      		 Always 1 MΩ Higher

      C21-2 (D-) -

      Body ground

      		 Always 1 MΩ Higher

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

    10. Measure the resistance.

      Standard Resistance
      Tester Connection Condition Specified Condition
      C21-1 (D+) - C21-2 (D-) Always 1 MΩ Higher

    NG

    REPAIR OR REPLACE INSTRUMENT PANEL WIRE

    OK

    REPLACE CENTER AIRBAG SENSOR ASSEMBLY