You'll probably find that it was disconnected because iit malfunctioned. A common thing to go is the control box or the wires in the steering column going to the stalk. Easiest way to hook it back up would be to find another 'Burb to compare to.
If it was me I'd throw an aftermarket control on. For about $100 you'll have something that you know works that'll come with a decent set of instructions.
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