I'm trying to check if my seat belt pretensioners are still good or i need to change them. I just purchased the truck and i'm not sure if it was in an accident. what is the resistance i should be looking for at the 2 pins coming out of the tensioner? can someone take a known good unit and check? preferably out of a 2004-2006 model year. My airbag code tells the there is something wrong with the system but nothing specific. i don't want to spend the cash if that is not the problem.