This may not help at all for your car, but give it a try. I could not find my horn relay in YRV (2001) either - and posted a question here couple of weeks ago. Horn relay woes YRV - #3 by arnold6 It turned out the relays for wiper and horn were soldered to the wiper/light/indicator stalk switch assembly, so I had to take out the steering wheel and clock spring unit out to access it. If you can download wiring diagram (I had, from Daihatsu Club Net), it will confirm where the relay is located. Not sure how to upload picture on this site. . .
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