Hey guys I just bought an 03 Sierra on Friday with 85K miles on it. Cruise control does not work at all. Checked the fuse, its good. Where do I start?

check and make sure your brake light bulbs are in working order.

if u have a burnt out bulb the cruis will not work

Bulbs are all good - thanks, good suggestion!

I haven't checked the brake switch yet. Do the modules themselves go very often?