kind of sounds like they could be talking about the abs computer.. which is located under the passenger seat.. from what ive heard, its not very often that the problem is there... they are definitely not talking about the abs module though, that is not just a simple swap out... well it is.. but you have to bleed the brakes afterwards. but replacing mine is what has had my abs light off for a month or two now after it had been on steady for almost a year