First I would retrieve codes stored in the system using a scan tool. The most likely cause is the squib cable that allows signal between the steering wheel and steering column but I hate replacing parts without proving they are defective. There is a company that independent auto repair shops get their information from, this same information is available inexpensively for people that work on their own cars.. The information is year make and model specific, covering repair procedures, torque specifications, fluid capacities and specifications, service bulletins, component locations, wiring diagrams ect.... Alldata is very easy to navigate http://bit.ly/AllData_Repair_Manuals_Online
but I would also suggest first retrieving codes!