2015 Silverado WT adding aftermarket radio and getting audio controls to work on steering wheel

[Tbone817]

Hi, I really appreciate your time. I have a 2015 Silverado WT .I have bought the Denali cluster from White auto and new steering wheel with controls and heat.

Got the correct clock spring  and did the wire from cluster to clock spring  harness. I have IO4 small screen. All works except audio controls from wheel

Question is I want to replace factory radio and use a Pioneer 8500 I have. What do I need to do to get the steering wheel audio controls to work?

They are not working now with the stock 4 inch screen.

I have the Maestro RR installation kit for the pioneer

 

Thank you for your time Trent