dany

The horn suddenly stopped working. I tested the horn itself: it's ok, the horn fuse is not blown, and I can hear the horn relay turn on when pressing the horn pad.


I can't do any more testing without the wiring diagram. I tried really hard to find it but it doesn't seem like a common problem for these late models.


Any help will be appreciated !


Crewcab 2012, 5.0L, 142000 Km

dany

Does someone at least know where is located the horn relay? Even without wiring diagram, I could at least check power at relay terminals?

I've seen that on older models it was located behind the interior fuse panel and not a plug-in type relay. Is it still the case on later models?

A picture would be great

Thanks

Legendsk

I have an image of the horn system schematic for a 2008. Perhaps it would be close enough to help?

dany

I can't tell this 2008 horn diagram if identical to the 2012 but it shure helped me to find the problem.

It was a bad horn ground connection.
There's a bunch of ground wires tied on the same lug, just in front of the air filter box (see pictures). I shaked the wires and the horn got back to life. I cleaned, lubed and retorqued the bolt to make shure there is a good contact.

Not 100% shure if it wasn't a bad connection of the wires within the lug itself. Time will tell.

Note that there is many (more than 10) ground wires within this lug and it might also be related to another post I maid concerning a problem I got with the engine cranking but not starting, like if there was no fuel or no spark... If it gets back, I'll cut out this ground lug and have a deeper look at each wires.


Thanks