98 Olds Acheiva..horn quit working. How do you know which fuse is the right one. If itss a relay where is that?

look for a relay not a fuse

Been to long since I worked on a 98. Best guess is the turn signal switch. It could be the clock spring at the steering wheel. Both are a steering column issue.

You have fuses and relays . The fuses are or should br labled inside each cover if still there as well as on the fuse block itself, If not I can look under the hood of mine and tell you. The relays from left to right thats passenger to driver and numbered including the empty spaces as mine hase three on the right and two on the left with three emty slots in between. Now Olds seems to have kept this araingement for some time also my '98 88 has ABS as part of TCS but no relays there and diferent climate controls over the years it is posible you have more or less than are presnt on mine the complete list is as follows
#1 - AC compressor control for the compressors clutch
#2 - Horn relay
#3 - AC blower fan motor on, at low speed on the '98
#4 - AC blower motor off or high speed depending on year, not present on my "98
#5 - ABS pump relay ,not present on my '98
#6 - ABS Main relay also labled as pump relay for some years, not present on '98
#7 - High speed cooling or radiator fan
#8 - Low speed cooling or radiator fan

The fuse will be marked "htr A/C".It might be on the very top row of 2 fuses or it might be in the center next to "B/U horn". There is also a resistor on the heaterbox beside the heater motor that goes bad quite often. It could also be a worn out fan switch inside the car. I would replace the resisitor first.

check the fusebox under your hood for the horn relay,should be a black box close to your battery that has fuses in it

if you check the wire that comes from the horn button to the relay for voltage when the horn is pushed and have voltage then you have a bad relay,if not then you probably have bad contacts in the horn pad area or even the clock spring itself.

have you checked the fuse for the horn you don`t say what you have done to this point,if the fuse is good and you hear a click when you push on the horn button, then the horn relay is good as that is what is clicking,if not you will have to check the horn itself as some relays won`t work if the horn not itself is not working,by running a jumper wire from the battery positive to the terminal on the horn, it should work if not then the horn is the problem.the relay is on the fuse panel under the dash.I think it is a square sided relay

You have a fuse under the driver side dash and also under the hood on the right side. Sometimes your fuse box is right inside the passenger door.

fuel shutoff switch is actually a fuel pump relay in the relay box under the hood, but it is not unusual for a fuel pump to work on and off before it finally dies. but it is a good idea to check the relay first.

try swapping it with the horn relay (if the horn works). pay attention to the direction the relay is in. on GM's, it's possible to put them in backward or even miss the connectors completely.

you also want to check for proper power and ground in the relay socket.

when you depress the horn, the relay should click, if not then the horn button or connection is bad. these have 2 buttons, right? it doubt both could be bad. if just one big horn pad, pad could be bad