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Wouldn't disconnecting the battery potentially erase the fault code from the computer's memory? Or would that have to be done with a scan tool? I had the same problem with the airbag system on a 98 S10 I used to own. The light would come and go randomly while I drove. I never bothered to look into it too deeply since I was uncomfortable with messing with the system for fear of accidentally setting it off! It must be a fairly common issue on that era of trucks.