Do you have the roof mounted horns?
supply to horns and check for voltage while someone blows horn.
If no voltage, check relay and fuse.
Fuse box is in glove box behind a 4" x 4" removable plastic panel on the far left.
Held in place with velcro.
If you get voltage, replace horn/s
Found a set of marine horns that fit and sound great.
All S/S too!
All this info applys to a '89 345, possably the same, maybe different.
This lawyer talk is so unnessary, but someone will always jump in.