Under the laws of all states in this country if you received a written warranty with respect to the vehicle that you purchased and you dated and signed it, then you are presumed to have read and understood it absent fraud on a third party.The problem that I see from your perspective is that if the written warranty that you have described in your question limits issues regarding your vehicle and its purchase and you signed and dated it, you are bound by its terms regardless of the fact that you may not have read the entire warranty but expected the salesperson to explain it to you.