(a) The written warranty provided for in section 481J-2 and the written notices provided for in sections 481J-3 and 481J-4 shall be delivered to the consumer at or before the time the consumer signs the sales contract for the used motor vehicle. The warranty and the notice may be set forth on one sheet or on separate sheets. They may be separate from, attached to, or a part of the sales contract. If they are part of the sales contract, they shall be separated from the other contract provisions and each headed by a conspicuous title.(b) The director of commerce and consumer affairs may adopt rules pursuant to chapter 91 necessary to implement the notice provisions of this chapter. The rules may include the establishment of wording, format, placement, and distribution requirement for all notices specified in this chapter.(c) The failure of a dealer to provide the warranty or notices required by this chapter or the provision of false or misleading notices or warranties shall constitute prima facie evidence of an unfair or deceptive act under chapter 480.