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There is a 30 amp (pink) fuse located in the fuse box located inside the car (see picture below) and it is in the number 11 position in that box. That fuse is for the wiper system there is also a hi/low wiper relay located in the power distribution box located in the engine compartment. It is in the number 1 position (the big number 1 not the diode or fuse). You may want to check that out as well if the fuse is good. The picture for that is also below. I hope this helped and good luck.
The horn fuse for this 2002 ford f150 is located in the engine compartment fuse/relay box , heres a diagram of that box , i circled the fuse for the horn, it is in location f1.7. hope this is helpful. also you may want to check the horn relay thats also located in the same box and i circled that also. have a good day.
check for water intrusion on left side of dash. just above the fuse panel (or on backside) if this is so..the GEM module may have been damaged...for short term to drive the truck...turn the key to the on position without starting truck...shift into neutral, then start the engine....you can now drive the vehicle until fixed...hope this helps!
sounds like you have a problem with the gem module, (generic electronics module). This is a common problem with most ford trucks and suv's. you can find it behind the knee bolster on the drivers side under the dash.... hope this info helps.