You just diagnosed the electrical short in the alarm system but now the question is where? Check the wiring at the main junctions since you have 2 problems at once. By the way the horn & flashers do work other than using the alarm, Right? If so start at the fuse box & trace the wiring where the alarm is spliced in.
SOURCE: 1986 toyota pickup horn malfunction
hi
Check whether power is coming to horn.
if ok means then check the horn
thank you
SOURCE: turn signals
replaced turn signal flashers and muti switch turn signal still won't work Why?
SOURCE: 2001 TA WS6 - Horn and key fob not working
Horn problem is either bad horns or failed clockspring behind steering wheel which is the connection for the airbag and horn buttons.
SOURCE: Horn stopped working
HORN CIRCUIT RUNS THROUGH AIRBAG "CLOCKSPRING". THIS CLOCKSPRING IS A ROTATING DEVICE THAT HAS A SPIRAL CABLE INSIDE THAT FLEXES AS YOU TURN THE STEERING WHEEL. THE PROBLEM AFFECTS THE CRUISE CONTROL SOMETIMES AND THE AIRBAG LIGHT MAY STAY ON ALSO. ONE OR MORE FUNCTIONS MAY BE AFFECTED OR JUST A SINGLE CIRCUIT(HORN). THE PROBLEM AREA WILL BE FROM THE STEERING WHEEL DOWN(MOST LIKELY THE CLOCKSPRING) HAVE YOUR DEALERSHIP RUN THE VIN NUMBER THROUGH THEIR SYSTEM AND SEE IF THERE ARE ANY RECALLS CONCERNING THIS. HOPE THIS HELPS YOU!!
SOURCE: in my 2000 sierra the flasher clicks
A FAULTY MULTIFUNCTION SWITCH WILL CAUSE FLASHER TO CLICK.
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