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 sensor assembly.
Based on the signals sent by the door side airbag sensors, the airbag sensor 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 sensor 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. |
|
Does not apply to test/check mode |
CAUTION / NOTICE / HINT
NOTICE:
After turning the ignition 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.
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PROCEDURE
1. |
CHECK DTC |
(a) Check for DTCs.
Click here
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.
HINT:
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.
NG | ![]() |
GO TO DIAGNOSTIC TROUBLE CODE CHART |
|
2. |
CHECK DOOR SIDE AIRBAG SENSOR LH |
(a) Turn the ignition switch off.
(b) Disconnect the cable from the negative (-) battery terminal.
CAUTION:
Wait at least 90 seconds after disconnecting the cable from the negative (-) battery terminal to disable the SRS system.
(c) Replace the door side airbag sensor LH with a known good one.
Click here
HINT:
Perform the following inspection using known good parts from another vehicle if possible.
(d) Connect the cable to the negative (-) battery terminal.
(e) Clear the DTCs stored in memory.
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(f) Turn the ignition switch off.
(g) Turn the ignition switch ON, and wait for at least 60 seconds.
(h) Check for DTCs.
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OK:
DTC B166A/72 is not output.
HINT:
Codes other than DTC B166A/72 may be output at this time, but they are not related to this check.
(i) Turn the ignition switch off.
(j) Disconnect the cable from the negative (-) battery terminal.
CAUTION:
Wait at least 90 seconds after disconnecting the cable from the negative (-) battery terminal to disable the SRS system.
(k) Restore the door side airbag sensor LH that was installed for testing to its original location.
Click here
OK | ![]() |
REPLACE DOOR SIDE AIRBAG SENSOR LH |
|
3. |
CHECK DOOR SIDE AIRBAG SENSOR RH |
(a) Replace the door side airbag sensor RH with a known good one.
Click here
HINT:
Perform the following inspection using known good parts from another vehicle if possible.
(b) Connect the cable to the negative (-) battery terminal.
(c) Clear the DTCs stored in memory.
Click here
(d) Turn the ignition switch off.
(e) Turn the ignition switch ON, and wait for at least 60 seconds.
(f) Check for DTCs.
Click here
OK:
DTC B166A/72 is not output.
HINT:
Codes other than DTC B166A/72 may be output at this time, but they are not related to this check.
(g) Turn the ignition switch off.
(h) Disconnect the cable from the negative (-) battery terminal.
CAUTION:
Wait at least 90 seconds after disconnecting the cable from the negative (-) battery terminal to disable the SRS system.
(i) Restore the door side airbag sensor RH that was installed for testing to its original location.
Click here
OK | ![]() |
REPLACE DOOR SIDE AIRBAG SENSOR RH |
NG | ![]() |
REPLACE AIRBAG SENSOR ASSEMBLY |
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