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 store DTC B166A/72.

DTC No. Detection Item DTC Detection Condition Trouble Area 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

 Does not apply to test/check mode

CAUTION / NOTICE / HINT

Note

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

Click here

PROCEDURE


  1. CHECK DTC


    1. Check for DTCs.

      Click here


      Body Electrical > SRS Airbag > Trouble Codes
      OK
      DTCs B1623/81, B1633/81, B1642/81, B1643/81, B166D/81, B166E/81, B1628/82, B1638/82, B1647/82, B1648/82, B167B/82 and B167C/82 are not output.

      Tech Tips

      If DTC B1623/81, B1633/81, B1642/81, B1643/81, B166D/81, B166E/81, B1628/82, B1638/82, B1647/82, B1648/82, B167B/82 or 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 power switch off.

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

      CAUTION:

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

    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 (-) auxiliary battery terminal.

    5. Clear the DTCs stored in memory.

      Click here


      Body Electrical > SRS Airbag > Clear DTCs

    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


      Body Electrical > SRS Airbag > Trouble Codes
      OK
      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.

    9. Turn the power switch off.

    10. Disconnect the cable from the negative (-) auxiliary battery terminal.

      CAUTION:

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

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

      Click here

      Result
      Proceed to
      OK
      NG

    OK

    REPLACE DOOR SIDE AIRBAG SENSOR LH Click here

    NG

  3. CHECK DOOR SIDE AIRBAG SENSOR RH


    1. 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.

    2. Connect the cable to the negative (-) auxiliary battery terminal.

    3. Clear the DTCs stored in memory.

      Click here


      Body Electrical > SRS Airbag > Clear DTCs

    4. Turn the power switch off.

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

    6. Check for DTCs.

      Click here


      Body Electrical > SRS Airbag > Trouble Codes
      OK
      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.

    7. Turn the power switch off.

    8. Disconnect the cable from the negative (-) auxiliary battery terminal.

      CAUTION:

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

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

      Click here

      Result
      Proceed to
      OK
      NG

    OK

    REPLACE DOOR SIDE AIRBAG SENSOR RH Click here

    NG

    REPLACE AIRBAG ECU ASSEMBLY Click here