2004 Silverado 2500HD. Airbag/Steering wheel control issue

Try unhooking the positive post on the battery this should reset the system. As far as the radio controls and airbag, this shouldn't be related the changing parts. Try checking the fuse panel for burnt out fuses.

If you have an anti-theft radio option, when you disconnect the battery you disable the radio. there is a code you need to activate so this does'nt happen, but you must do it before you disconnect the battery. by taking the truck to a dealer, he will use the VIN number and the radio serial number to get the reactivation code from the GM tech service computer bank----------just another example of the useless **** GM puts on their vehicles and costs their customers more money and time.