The context is important to know whether he actually did fasten his seatbelt. If the next sentence tells us that the car was struck by another vehicle killing them both, it needs to be answered. Consider this event: She started driving and was hit by another vehicle before he had fastened his seatbelt.
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Zhek BlackoutShe started driving before he had fastened his seatbeltSee
CalifJimSee past perfect in dependent clauseBefore I had finished reading your entire post, I thought of posting a sentence to see if Iunderstood what I read.
LaboriousBefore I had finished reading your entire post, I thought of posting a sentence to see if I understood what I read.