How to connect buttons on a rudder to a radio Pioneer?

[flashdn]

Forgive for my English, I use an online translator. Has established to the client in grand prix 1997 Pioneer AVH-5300DVD. It wants that buttons of management on a rudder worked and has bought the universal adapter. But I cannot find a wire going to radio from buttons on a rudder that it to connect. Who can help? In advance thanks.
P.S. The adapter here such
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[Explicit_Spade]

The english word for rudder would be steering wheel incase you hear that pop up again.

I see what you linked is a universal adapter, I'm sure you could make that work, but for an easier installation, I reccomend installing this unit: Pac-Audio.com Product Details | iPod Integration for your car and More by Pac-Audio - Connecting you to the future

That will make the steering wheel buttons control your pioneer head unit specifically.

 

[flashdn]

Thanks, I shall offer the client. But complexity not in the adapter, and in that to find the necessary wires from a rudder in a socket of a radio tape recorder. Buttons resistive?