AVIC isn't a company or place. It's the designation Pioneer uses for it's navigation units. Pioneer's phone number is somewhere on their website... probably at a "support" or "contact us" link.
http://www.pioneerelectronics.com/PUSA/
Edit: did it for ya. Took 10 seconds lol.
For Service & Support Please Contact Us At:
Support Icon Small 1925 E. Dominguez St.
Long Beach, CA 90810
Call (800) 421-1404
Or contact us by e-mail.
Hours of operation:
24 hours a day for most services. Hours for product service, product operation and parts inquires:
Mon. - Fri. 9:00 a.m. - 7:30 p.m. Eastern (all product inquiries).
Sat. - Sun. 11:00 a.m. - 7:30 p.m. Eastern (plasma, DVD recorder, navigation inquiries only).