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A vehicle has many relays: Starter, Horn, Blower motor, wiper, Headlight, Fuel pump, etc.
I found that the fuel relay is the same number as some of the other relays such as the horn. You can check fuel relay by replacing in the horn relay if the horn works the relay is good.
There's a bank of relays under the hood on the same brace as the radiator, passenger side. The horn relay should be one of this group.
The wiper relay is underneath the dash on the driver's side. In the same location are the relays for the horn, headlamp, flashers and door locks. They are in cluster of relays.
Starter relays are mounted ON the starter. They are a part of the starter and are always replaced when you install a new starter. In general, it's recommended that you replace them as a pair anyway, since the starter solenoid (relay) and starter motor generally wear out at the same rate.
the answer is the neutral saifty switch relays the starting signal to starter the neutral safety switch relays the starting signal to starter from ignition switch they look the same but plug up different make sure you have right neutral switch
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.
Not sure if the answer is the same on an '01, but on my '04 Sierra I had the same problem. There is a big relay box under the hood on the driver's side mounted over the wheel well. There is a relay for the horn in there along with relays for many things you wouldn't think needed a relay. The layout is on the bottom of the big lid to the box. To check if it is the relay, swap it out with one of the other relays in the box. I have had to change 6 since I went over 200k. They are available at aftermarket parts stores for around $15.
Relay switches are typically in the fuse box compartment underneath the hood usually on the driver's side (~not~ the fuse compartment under the dash) You will see a black plastic box. Pull the cover off. On the under side of cover will have a list of what each fuse, micro relay, and mini relay are for. You will see an entry for the fuel pump relay or possibly just "fuel relay". How to test your relay switch. Some of the relays in the fuse compartment will be exactly the same relay. For instance the horn relay can be (not in all cases)the same type of relay for your fuel pump relay. So if you think you have a bad fuel relay switch... change it with the horn relay switch... then honk your horn. Does it work? (Of course make sure your horn works in the first place). If your horn works with the fuel relay switch substitute... your problem is not with your relay. If your horn does not work.. presto... you have a bad relay. If your relay continues to go burn out... you'll need to find out why. Possibly a bad ground.
Mine is a 1999 Accord V6 coupe and I don't think there's a horn fuse. There is a horn relay under the hood in the back left in a black plastic box. On mine there are 3 identical relays (2 for headlights and 1 for the horn). If the 4-cylinder has the same arrangement as the V6 you could switch the relays to see if that was the problem.
AC and fuel pump are the same relay
It's located in the fuse box, directly in front of the passenger side strut tower. You'll see a row of relays that are the same size. (four across). It is the second relay from the left.