Don't know what to check next.If unit is bad horn would still work I would think.Tell me what to check next.changed circuit breaker.
All fuses good replaced cut of switch circuit breaker.switches in steering wheel seem to be ok.If unit is bar horn should still work as long as all fuses are good.Tell me what else to cneck. What next?
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Well it depends on what you tested in the circuit most horns are vary simple they have a 12 volt wire hot and it goes through the horn to ground . If you put your muilty meter on OHMS and touch the red lead to the +side on the horn and the black lead to the ground side the meter should read 000 or vary low resistance if not go to the frame with the black lead if it reads 000 or differane from the last test then the horn is bad. Next test the power supply to the horn so put the meter on the 20 volt DC. scale unplug the wires from the horn and see if you have 12 volts or any voltage comeing to the horn you may have to turn the key to run depending on how its wires but if the blinkers work the horn should to . You likely have more then 1 horn so look around in there make sure of what your doing or the tests will be no good . If you have no power at this point check the fuse box for a burnt out fuse it won't be a big amp fuse mabey 10 amps and may not say horn. Im sorry i don't know exactly ware the relay is on a 2008 focus but it would be in whats called a relay center witch you likely would be able to find in the oweners manual in the glove box . But the horn is rarely used and most likely a connection problem they tend to be low on the vehicle and get wet along with road salts in the winter depending ware you live can get corroided . But if your going to test make sure the test is going to give you the information you need to correctly daigonis the problem Good luck
on 1987 all you mentioned are on same fuse #11 located in fuse box below steering wheel 3rd row 3rd fuse from left next to either a blank space if you do not have power windows,or next to silver circuit breaker if you do have power windows.
Fuse controlling the horn is usually a 15A fuse located in the Distribution Panel under the dash.
Usually there is a cluster of fuses running 4 across and about 8 down on this panel.
So, look for all the 15A fuses in this cluster and check with a circuit tester.
If you check each side of fuse and get the light...then fuse is good.
If ya get light on one side and not the other...you've got a blown fuse.
Before you do this, disconnect the wire off the horn and connect circuit tester to the horn's power wire / socket and press horn switch on sterring wheel.
If you don't get the light glow...then check your fuses.
If you get the light glow...then your horn is bad...and they do go bad.
Hi, download your manual here: https://www.fleet.ford.com/maintenance/owners_manuals/default.asp
On page 282, it says the power windows are on a 20 amp circuit breaker. This breaker automatically resets itself, so I doubt it is your problem. I don't have the wiring diagram, but if the driver's switch panel has a safety shutoff, then all power goes thru that switch. If the power is not getting there or the switch is bad, then none of the windows will work.
jnjkingbird, It sounds like this problem is the clock spring as I don't believe that the horn and the cruise control would share a fuse. However, they do share a circuit in the clock-spring. You can check for power at each unit (horn and the cruise control) which would confirm this. Check each fuse as well. Good luck with this.
I don't really see a dedicated fuse or circuit breaker for the moonroof. I do see a 30 amp circuit breaker for the mmonroof but that also controls the power windows and the sliding back light as well as the moonroof, so if you're not having problems with the other stuff I would say it's not the circuit breaker. There is a 10 amp fuse for the delayed accessory power for audio, power door lock switch & the moonroof switch illumination. The 30 amp circuit breaker is located in the number 401 position in the passenger compartment fuse box (see picture below) and the 10 amp fuse I was telling you about is in the number 22 position. If it's just the moonroof itself I would check to make sure the switch itself is good or even the motor could be bad. I see no fuseable link going to the switch but that's not saying there may be a bad wire so check for power to the switch. Wish i could have been a little more help but in this case this is all I can give you. I hope this helps and good luck. Here is your picture:
This wold indicate that you have a shorted horn circuit. Generally, the horn circuit has a negative contact at the steering wheel, meaning when you push the button, it grounds (-) the sysem causing the relay out in the engine compartment area to provide 12V (+) directly to the horn. If nothing else causes the fuse to blow, the pwr window/sunroof., then either the relay itself is shorting out or a wire to the horn is grounding, or you have a bad horn. (spend a few fuses & save time, unplug the relay, replace the fuse & press the horn button & see if the fuse blows. Next, plug in the relay & do the same for the horn)
Generally it won't be the wire from the horn button or the horn would be working continually. Your owners manual should tell you where the relay is & you could see if you notice any unusual appearance to the case, as well as following the wiring from there to the horn, to see if any damage is apparent. IE: if the horn is located in the front grill area or near a opening in the fenderwell, does it appear a rock or something has hit it or any wiring causing damage. With a vehicle as new as yours, if it isn't obvious damage, I would suspect the relay. good luck
If the horn works with direct connection, and fuse, relay, and circuit breaker are all good, it's the switch in the steering wheel. If it is anything like the chrysler auto's, the switch and the air bag module is all one unit, can't replace just the switch, the whole thing, and it's about $700 to $800 for those units, at least it is here, and can only get them at a dealer.