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More than likely the window lift motor is defective and the cause is the brushes are sticking. Other causes are of course the switch and the wiring to the door. The horn needs to be tested, pull it out and hook a jumper to the battery and see if the horn sounds, if it does then you may need to replace the ribbon contact under the steering wheel it has a open filament circuit that is to the horn switch. NOTE always disarm the airbag system before doing any work on the steering wheel.
Hi, you have to conduct a small test yourself to get the cause of the problem
Start by testing the horn itself. Run a jumper wire to the power connector on the horn, and to the positive battery terminal. When you touch the battery terminal, the horn should sound. If it does not, replace the horn.
If the horn is good, the problem is either in the switch in the steering wheel, or in the horn relay!!
when I had that problem it was the contacts under the steering wheel pull the steering wheel and you will see a copper ring the horn is connected to ground out that copper ring against the steering column if the horn sounds you have a worn contact I fixed mine by putting a spacer under that copper ring good luck with it
you may need to put a relay in it as the current from the horn may be back feeding up the immobiliser horn circuit and causing a short. Sounds like the immobiiliser has its own source of power seperate from the factory circuit When you press the horn the power goes to the horn and up the immobiliser horn circuit and it blows the fuse.