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If the unit is still not functioning normally, please review the items in the following checklist. This guide will help you isolate the problem if the unit is at fault. Otherwise, make sure the rest of your system is properly connected or consult your authorized Alpine dealer. Basic No function or display. • Vehicle's ignition is off. -If connected following instructions, the unit will not operate with the vehicle's ignition off. • Improper power lead connections. -Check power lead connections.