There is no relay for the horn!
towards the front left end of the fuse box it should be fuse number 12.
http://www.swedishautoparts.com/850/volvo-850-electrical-parts.html Try this website for a pdf. Hope it helps, Troy
The Volvo 850 has two horns in front of the radiator, lift the hood and their they are.
Check your fuses. There is a separate fuse for high speed.
The horn relay is the same as the wiper relay, it's located under the fusebox under the hood next to the driver side hinge. the fuse box comes out & there's another box attached to the bottom. it has a bunch of relays, the horn/wiper relay is in the top row, 3rd from the left (or 2nd from the right). if you're having trouble w/ the horn, and the intermittent wiper still works, it's probably the horn contacts in the steering wheel.
its located under the fuse box,pop the hood and unscrew the four TORX bits(t-25)and the relay is located underneath the cover
under the hood of the car unscrew the fuse box and your relays are underneath there, i changed my fuel pump relay last year pretty quickly its relay 103
The Volvo 850 1997 fuel pump relay is under the fuse box compartment, you would need to take out the upper portion of it and then you would be able to easily find it undeath. elyunque000@yahoo.com
You have to remove the glove-box. You will find the relay back - to left.
under the hood of the car unscrew the fuse box and your relays are underneath there, i changed my fuel pump relay last year pretty quickly its relay 103
That is the Fuel Injector relay and not the Fuel Pump relay. it's located in the fuse box (engine compatment)you will have to remove a cover once it's opened it's the relay # 103(it's a green relay).
Next to (underneath) the fuse cover. Take off the cover held by 4 screws. Fuel relay is labelled 103 (green 1993 onwards or red 1993).