Short answer is, I don't know. I know the fuses are inside the trunk on the right hand side. You may want to pose the question on Bimmerfest. Sorry I couldn't help.
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Id start by checking your fuses, find a fuse relay chart to make it easier finding what fuse is exactly for your horn, check the wiring attached to the fuse too make sure its in those cheap clips properly.
The horn is usually located in front of the radiator/condenser. I would test it by applying 12volts, if it works you know it is the horn relay or the horn button itself.
There was a recall done on those vehicles in 2008 for the same issues. Something about a clock spring. If the recall work has not been done on your SUV, bring it to a dealer.
this really depends what car it is but the horn is usualy mounted behind the front bumper area, please check the fuse i n the fuse box.. if the horn is good and the fuse is as well then check the horn push
find the fuse and relay panel and pull out the horn relay. the panel location is provided in the owners manual and a listing of what is what in there is on the back of the panel lid. the relay can be stuck, they are sold cheap new at auto parts stores. if that does not fix it then the switch in the steering wheel is bad and it requires much more mechanical aptitude to replace it.
The relays are located on the driver side inner fender... I heard that you can take the horn relay out and change it with the fuelpump relay and if the fuel pump works and horn doesnt then you know that it was the relay... Fuses are easy to check, just look at it, if it is broken then its the fuse.
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
Check your fuses first, the check your connections at the horn button and at the horn its self. All else fails take two pieces of wire hook one to the pos. and one to the neg. on your battery and test the horn that way to see if that is the horn went out.
Does the horn blow when you press the horn button on the steering wheel? If not I would first check the horn fuse ... then check the relay Swap it with a like relay (keeping in mind whatever you swapped it with won't work now if it is bad, or intermittant) ... owners manual will help with the locations of these.
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