How to Pair my iphone with generic car radio? Double din aftermarket?

I read the instruction and it didn't help at all. I turned on my iPhone Bluetooth and the car radios and nothing happened.

http://m.ebay.com/...1625697612

Make sure your car radio is discoverable too. Also, wait a few minutes for your IPhone to read the Bluetooth signal, however, it can take much less. Read the instructions thoroughly and recognize any mistakes you are making. If it doesn't work, contact the seller and declare your radio as a defective one.

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