AIRBAG SYSTEM, Diagnostic DTC:B166A/72

DTC Code DTC Name
B166A/72 Pressure Sensor Difference for Front Door

DESCRIPTION

The door side airbag sensor LH and door side airbag sensor RH detect impacts to the vehicle through changes in pressure inside the front doors caused by deformation of the outer side of the front doors and send signals to the airbag ECU assembly.

Based on the signals sent by the door side airbag sensors, the airbag ECU assembly determines if the airbags and pretensioners should be deployed.

If the difference between the pressure detected by the door side airbag sensor LH and the pressure detected by the door side airbag sensor RH exceeds a certain value a certain number of times, the airbag ECU assembly will output DTC B166A/72.

DTC No. Detection Item DTC Detection Condition Trouble Area Warning Indicate Test Mode / Check Mode
B166A/72 Pressure Sensor Difference for Front Door The difference between the pressure detected by the door side airbag sensor LH and the door side airbag sensor RH exceeds a certain value a certain number of times.

  • Door side airbag sensor LH

  • Door side airbag sensor RH

  • Airbag ECU assembly

 Comes on Not applicable

CAUTION / NOTICE / HINT

Note


  • After turning the engine switch off, waiting time may be required before disconnecting the cable from the negative (-) battery terminal. Therefore, make sure to read the disconnecting the cable from the negative (-) battery terminal notices before proceeding with work.

    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

PROCEDURE


  1. CHECK DTC


    1. Check for DTCs.

      Click here


      Body Electrical > SRS Airbag > Trouble Codes
      OK
      DTCs B1633/81, B1638/81, B1642/81, B1643/81, B1647/81, B1648/81, B166D/81, B166E/81, B167B/82 and B167C/82 are not output.

      Tech Tips

      If B1633/81, B1638/81, B1642/81, B1643/81, B1647/81, B1648/81, B166D/81, B166E/81, B167B/82 and B167C/82 is output, perform troubleshooting for the DTC first.

      Result
      Proceed to
      OK
      NG

    NG

    GO TO DIAGNOSTIC TROUBLE CODE CHART Click here

    OK

  2. CHECK DOOR SIDE AIRBAG SENSOR LH


    1. Turn the engine switch off.

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

    3. Replace the door side airbag sensor LH with a known good one.

      Click here

      Tech Tips

      Perform the following inspection using known good parts from another vehicle if possible.

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

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

    6. Clear the DTCs stored in memory.

      Click here


      Body Electrical > SRS Airbag > Clear DTCs

    7. Turn the engine switch off.

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

    9. Check for DTCs.

      Click here


      Body Electrical > SRS Airbag > Trouble Codes
      Result
      Proceed to
      DTC B166A/72 is output
      DTC B166A/72 is not output

      Tech Tips

      Codes other than DTC B166A/72 may be output at this time, but they are not related to this check.

    10. Turn the engine switch off.

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

    12. Restore the door side airbag sensor LH that was installed for testing to its original location.

      Click here


    DTC B166A/72 is not output

    REPLACE DOOR SIDE AIRBAG SENSOR LH Click here

    DTC B166A/72 is output

  3. CHECK DOOR SIDE AIRBAG SENSOR RH


    1. Turn the engine switch off.

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

    3. Replace the door side airbag sensor RH with a known good one.

      Click here

      Tech Tips

      Perform the following inspection using known good parts from another vehicle if possible.

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

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

    6. Clear the DTCs stored in memory.

      Click here


      Body Electrical > SRS Airbag > Clear DTCs

    7. Turn the engine switch off.

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

    9. Check for DTCs.

      Click here


      Body Electrical > SRS Airbag > Trouble Codes
      Result
      Proceed to
      DTC B166A/72 is output
      DTC B166A/72 is not output

      Tech Tips

      Codes other than DTC B166A/72 may be output at this time, but they are not related to this check.

    10. Turn the engine switch off.

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

    12. Restore the door side airbag sensor RH that was installed for testing to its original location.

      Click here


    DTC B166A/72 is output

    REPLACE AIRBAG ECU ASSEMBLY Click here

    DTC B166A/72 is not output

    REPLACE DOOR SIDE AIRBAG SENSOR RH Click here