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if the pre-tensioner has fired you should see the a difference in the buckle height compared to the other seat. It basically has a metal cable connected to the seat buckle that pulls it down and (literally does what its called) pre-tensions the belt in case of the impact.
On the buick, I had two different plugs associated with this. One plug is on the belt assembly in the pillar itself (because the belt assembly a lot of times is also a one-time use thing in case of an impact) and the other plug goes to the pretensioner on the seat.
What you could also do, since the issue is showing up on the drivers seat and not the passenger seat, is take a multimeter and compare the resistance on both pre-tensioners and continuity on the plugs. I was able to diagnose a bad plug (they were kind of special plugs, at least on the buick) that was giving me a similar issue.
Its quite possible that something happened to the plug or wire itself and nothing serious is actually happening.
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