Hi folks, I have been doing a lot of reading about horns on here but unable to find a solution to my problem... actually, I haven't been able to find the same symptoms..
I have a 2006 F150 crew cab and having issues with the horn not working... so to speak.

When I press the pad in the center of the wheel, the horn does not blow. I checked the fuse in position 26 in the fuse panel by the passenger foot well... fuse was good, but still swapped it out. When I press the horn pad I do not hear a any type of relay clicking. From what I read so far, it indicates that the relay is built in to the back of the fuse panel?? Others say it's in the small fuse/relay panel under the hood on drivers side... the manual doesn't show anything for a horn relay out there, mostly daytime running light stuff.
My cruise control works... and my horn itself works, because when I lock the truck with the keeps entry fob with 2 presses, the horn makes a quick blow.

Is there an actual relay for the horn somewhere that can be tested or swapped out? Is there a way to test the actual switch behind the steering wheel pad without getting killed by the airbag deploying?

Many thanks folks!

 

Edit

You can disconnect the battery and remove the airbag from the steering wheel. There's two nuts under some covers about the size of a quarter behind your steering wheel buttons. Make sure the battery is disconnected when you hook it back up.

 

Still no luck with horn issue... I'm trying to locate the relay in this 2006 F150 and all the manual says is the fuse is in slot 26 and the description for that slot says "horn relay (pcb3), horn power". Anyone know what pcb3 means? I don't see a relay anywhere close to slot 26. From my research, some people say that the relay is a part of the fuse block, in the back of it? Can this be checked or even replaced? If it is blown, does the entire fuse panel need to be replaced??

Also, I was trying to trace the power wire up to the switch at the base of the steering column... I read somewhere that the one for the horn is a dark blue wire... All I can see there is a regular solid blue wire and a dark blue wire with a green trace stripe... Either way, I probed both and with key off, there is no voltage, with key in run position there is the 12 volts... I press horn pad and the voltage doesn't change...

This is driving me nuts..... Help... Please....

 

Do other functions in the steering wheel work, such as the cruise buttons?

 

Yes, all the buttons and functions on the steering wheel work... and there are no trouble lights on in the cluster.

 

So just the horn...I think the horn "button" (pushing the center steering wheel pad) supplies the ground in the horn circuit. I can check my factory wiring book when I get home to get the complete circuit for the horn.

 

Check the steering column contact points including the universal joint and where the bearings clamp to the chassis. It might have lost its ground.

 

Thanks bucks, that would be greatly appreciated! So, from what I'm understanding is that if I could figure out what wire is going up the steering column that is supplying power to the horn, I just short that to ground and the horn should blow? This would indicate the horn switch itself is bad? If it don't blow it would be the elusive horn relay that can't be located? Correct?

Thanks LaMartian, I can certainly check the grounding points for the steering column... how many points are there? And locations? Would it be just bolts? Or am I looking for actual ground wires? I'm thinking the ground would be ok because cruise is working..

 

Not having diagrams, if it was my truck I'd take the steering wheel controls and air bag off and get a physical look at the horn switch. If it only has one wire leading from the switch to the column with a connector, then the other side of the circuit is indeed grounded to the column and the wire you see is the positive lead back to the battery. (You'll see the horn switch wire going to the steering column and the other switch wire just bolted to the "case" where the airbag sits; the subsequent bolting of that case to the steering wheel establishes the negative ground to the chassis.)

If you take off the kick panel below the wheel and look at the column, you should be able to see where the column is actually bolted to the chassis parts.

 

Keep in mind not all vehicle steering wheels have chassis ground, some get a wired ground through the clock spring, but you and I are both in the position where we don't know which one you have and we don't have diagrams so that's what I'd do. Never taken apart my particular steering wheel before, but I've done it on other vehicles and it was always pretty simple.