Factory GM steering wheel radio controls

Has any worked on S-10 blazers with the radio controls has anyone any info Chevys with radio controls on the steering wheel? I have a 2001 S-10 that was a salvage rebuild,it has the factory delco radio,and like I said,controls on the wheel for the radio.The switches lite up with the panel lights but do not control the radio.I looked at the base of the steering colume for unplugged connectors and behind the radio but found nothing.It is possable that a 'used' wheel was installed when the truck was rebuilt.Does anyone know how to identify a declo radio that can be controled with the paddle switches,any info would be a help,color codes..etc.

if the radio is suppose to work with the steering wheel remote buttons there should be two harness behind the radio one for power and what not and one that goes to the steering wheel. If you have an aftermarket radio swix will alow you to use the factory buttons.