I found the steering wheel adapter to hard wire the radio to the controls. The installers tried to sell me the wireless unit, but I insisted on the wired unit I found. The signal could get blocked depending on where they would mount the wireless unit, and wired will prove to be more consistant and reliable.
I purchased the PAC: SWI-PS. It is fairly new and works with Sony and Pioneer head units that have a wired remote input jack.
The install company is supposed to give me a short lesson how the steering wheel controls will work with the new radio when I get it tonight I'll post more on how it works when I get my car back. I need to get the XM activated next.
This job: 1 Pioneer AVIC-D1 Touchscreen navigation radio
1 XM data traffic nav / XM radio tuner
1 PAC audio steering wheel control adapter
1 Special wiring harness, used for Volvo or something else like that.
1 Custom installation into dash
All said and done the Installation cost me $250!!! For me to do all that $250 was a bargain, I just don't have the time for all of that!!! They had to find and tie that radio into the brake, speed, and other sensor cables for the Navigation to work!!!
I will post pictures in the next couple days!!!!