Under the dash
Under the dash driver side
It is located in the fuse box under the hood on passenger side.
You can find the fuse box diagram for the Buick Riviera online at places like auto-wiring-diagram.com. You can also find this diagram on the website called Team Buick or in the Buick Riviera owner's manual.
Both the 20 amp fuse and the horn relay on 95 Buick Riviera are located in the under hood fuse box in the engine compartment just behind the passenger side headlamp.A detail of the fuses in this fuse box can be found on the inside cover of the box.
If it is not located in the fuse box on the side of the drivers side dash then pull up and out on the back seat and there are several more fuse boxes there. Most probably located there. Each box usually has a list of what each fuse location is.
Under the back seat!
It is under a plastic cover behind the passenger side headlamp assembly.
inside , right by the drivers right calf, it's hidden behind a pull out panel
NO relay just fuse.
The fuse box for a 1970 Buick Rivera is located under the drivers side of the dash, near the left kick panel. It may have a plastic cover over it.
there is a fuse panel located at the end of the instrument panel near the drivers door there is an underhood electrical center ans two other fuse panels located under the rear seat
It's under the back seat
under hood