Have a D3 in my '08 Scion tc. I don't have use of my steering wheel audio controls as a result. Another forum said to look for a PAC SWI-PS module. Anyone know where I can get one cheap? And is this relatively simple to set up?

 

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check here

 

for instal if you are good with the electronics follow the instructions or check out the scion boards or get installed by a shop