where is the horn
On the steering wheel!!!
the physical horn, you should gain access, open the hood, and look for a small (3-4 inches tall) black round circle (behind the grill) should be on a Trans Sport, easy to see, (if i remember it correctly), has a wire going to it...idea: check the fuse before you go replacing electrical components
Search Pontiac Trans Sport Questions
Are you a UK consumer? CarGurus now has a discussion forum in the UK.
Pontiac Trans Sport Experts