Most vehicle insurance policies do not extend coverage in Mexico.  You need to purchase specific insurance to cover your vehicle while in Mexico.  Here is a link to an insurance company that we use when we go to Rocky Point.    CLICK ON THE FOLLOWING LINK TO QUOTE AND ISSUE A POLICY FOR MEXICAN VEHICLE INSURANCE:

http://web2web.mexicoinsuranceonline.com/index.cgi?agentcode=ALN