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You would remove the air bag and do your diagnostics from there, it wouldn't be unusual for the contact to have failed to the T/S cancelling cam. You wouldn't remove the steering wheel until it became required. The tower on the cancelling cam can fail and that would require going into the column but not far. The insert/spring can fail also.
On my 1991 the horn didn't work i pulled the airbag and the little spring retainer would not lock in place so i put a small screw to hold it in.
it works fine now.
The little plastic lock that holds the horn wire in place(you will see it when you take off the horn pad/airbag at the center of the steering wheel) breaks it gets brittle from heat and age.
What I did with mine was shorten the plastic so the end stays out to make contact with the horn ring under the lock plate.
I threaded a self tapping screw to hold it in the hole, it worked fine the other choice is to go to a junk yard take one off another GM car then splice the wire.