I sell those, the description from my catalog says...
"Steering Wheel Control Interface, the SWI-X allows the customer to retain the use of their steering wheel, rear seat radio controls or their steering wheel AC controls when replacing the factory head unit. The SWI-X will interface almost all infared head units with almost all vehicles with sterring wheel or rear seat controls. Works with virtually all aftermarket radios with wireless infared remote capability. The SWI-X can help with some steering wheel heater controls including GM. Note: The SWI-X interfaces will only work with infared remotes that use a 38-40kHz carrier frequency."
I have never tried it but they do sell it on the Grand Prix store, so it should work. That'* all I can do except if you want to buy it I can get a better price.
ADTR 1999 Black Bonneville SE
2003.5 Yellow Mazdaspeed Protege
2003 Azure Blue Mach 1 Mustang