* Under the hood in the fuse box: This is the more common location. The fuse box is usually located near the battery. Look for a relay that's labeled or can be identified by its size and shape. You may need to consult your owner's manual's fuse box diagram to identify the horn relay specifically.
* Inside the passenger compartment fuse box (rare): Less common on this model year, but some Focuses might have it inside the car's fuse box, usually located under the dashboard. Again, your owner's manual's diagram will be essential.
To find it definitively:
1. Consult your owner's manual: This is the best resource. The diagram should clearly show the relay locations and labeling.
2. Use an online parts diagram: Websites that sell Ford parts often have diagrams for specific Focus years and trims. Search for "2003 Ford Focus fuse box diagram."
3. Check online forums: Search for "2003 Ford Focus horn relay location" on forums like Ford forums. Someone might have already asked and answered this question with photos.
Remember to disconnect your battery's negative terminal before working with electrical components in your car.
