* Under the hood, in the fuse box: This is the most common location. The fuse box is usually located near the battery. The relay itself might be labeled, or you might need to consult your owner's manual or a wiring diagram to identify it. Look for a relay with a symbol that resembles a horn or has the word "horn" printed on it.
* Under the dashboard: Less common, but possible on some S10 models. Accessing this area usually requires removing some trim pieces.
To find it definitively:
1. Consult your owner's manual: This is your best bet. The manual should have a diagram of the fuse and relay box layouts.
2. Use a wiring diagram: You can find wiring diagrams online (sites like AutoZone or other auto parts stores often offer free access to online diagrams after entering your vehicle's information) or in repair manuals. These diagrams will show the horn's circuit and pinpoint the relay.
3. Check the fuse box systematically: If you can't find a clearly labeled horn relay, carefully examine each relay in the underhood fuse box. You might need to test each one with a multimeter to see which one controls the horn circuit. (Be cautious when working around electrical components; disconnect the battery's negative terminal first.)
4. Look for loose wiring: If you suspect the horn problem is relay-related but can't find the relay, there's a chance it might be damaged or bypassed, and the horn might be directly wired. Look for any unusual wiring near the steering column or under the dash.
Remember safety first! Disconnect the negative battery terminal before working with electrical components. If you're uncomfortable working with your vehicle's electrical system, it's best to consult a qualified mechanic.
