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you must of traped a wire when you have fitted the head unit to the car when you have pushed it into the dash or the call wire is going to earth on something behind the radio in the dash hope you fine it hope ive help you let me now how you get on
check your ground wire ..
then check battery has enough charge..
usually fault is in where your stereo is connected to your ground source.. good luck ,if no luck try your checking your speaker wires for a short..
Crutchfield sells an aftermarket kit that allows the steering wheel controls to work, but it's $74, and you head unit must be remote control capable. They also sell a wiring harness that works with Kenwood/Toyota as long as you have the original wiring harness that came with the Kenwoood. You'll need to do some snipping and krimping however.
you need to hook the yellow wire off the back of the radio up straight to the battery this keeps memory power to the head unit then wire the wires in color coded sequence red to red black to black so on and so forth if this doesnt fix it you might want to think about replacing head unit
Unfortuantly the steerring wheel audio controls can only interface with a stock radio. Once you replace the stock radio the buttons are useless and cannot be hooked up to any aftermarket radio, this goes for all makes and models of cars with audio controls on the wheel.