If you plug it in, and it doesn't work, there probably isn't power to the socket. Try plugging in the cigarette lighter - If you still have the cigarette lighter that came with your car ...

CIGARETTE LIGHTER SPLITTER ADAPTER - Splits 1 car cigarette lighter port to 2 DC ports, 1 cigarette lighter male plug to 2 female sockets. A 2-Way cigarette lighter splitter adapter extension cord ...

Although adapters let 30-pin cables plug into Lightning sockets, any device requiring analog would not work. For example, some car systems transfer analog audio to the vehicle's sound system.