i just found a thread where soembody had a similar problem and shared screen shots from INPA where it showed 'detonation ckt is too few' the acceptable range seems to be from about 1Ω to about 7Ω.
Apparently you can measure the Ω. see this:
https://youtu.be/uAklUlvAIrs
notice that the airbag in the video has a shorting bar to prevent accidental detonation when the airbag is not installed, possibly the connector does the same thing and the repaired connector is not doing the job of opening the shorting bar (in which case you'd read a short across the wires (pin through the insulation).
If i did this test, i would not be 'right in front of' the airbag in case by some chance enough of the 9v battery in the tester got through the leads and sets off the airbag.