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Mine too, bad earth in the end up. took it off and wire brushed everything up, put it back on and it worked fine!
Phoned local Renault dealer the day b4 for some advice, *joke*, they also said it could be the rotary switch which they quoted me £82! Was thinking at the time that they had quoted me wrong as they also said that it would cost £70 + VAT for the actual horn itself if that was broke!
how do i go about doing this then. i've had a look i cant really see much. where abouts is it behind the bumper?
do i need to take the bumper off or can it be done with out taking the bumper off?? also any pics or anything of what it looks like, coz i dnt wanna mess up anything else.
nearly always faulty horn unit itself, seems to be prone to getting water in, best way to access is take the n/s arch liner out, then get a multimeter on it and get someone to press the horn so you can see if there is a feed. Or hook the horn up to 12v.
just opened up the steering wheel, had a look everything seemed fine, gave it a whack and made a squeak, then nothing..... now as i was about the close the steering wheel giving up hope.. it beeped, pressed it again and nothing.... hope this helps any clues.
Mine stopped working as well, Failed my Mot because of it
Was told to see an Auto Electrician Which im doing tomorow so will let you no the price etc
and Yours sounds like its wiring not the actual horn as it works.
If you get two pieces of wire connect em to the battery probs need two people and your horn goes off you no which part is broken but yeah sounds like earthing