easy on the caps please. it be like yelling on internet. and hurts my eyes when it is all caps.
check *fuse*.
check your *connection plug* to unit and pulling vehicle to see if corroded (di-electric grease) get from all automotive stores, and normally large hardware stores.
*multi meter* to check to see if you are getting 12V back to unit. (electronic stores to large hardware stores, to automotive stores) normally have these any were form cheap 15 to more expensive 50 plus units, cheap most likely good enough.
if you have a wireless remote, check battery in the remote. possibly replace batterie/s in remote.