My horn & alarm wont work

2008, why no post the year.?
fuses checked (tested) fuse 23, 10amp, under hood, !!!!????
did you scan it first to see if there are DTC errors. oh boy lots there are and all very USEFUL.
all else on car work ok, drives ok day or night???????
they want to do mine too. but I wont let them.
i dont park, top down in rain, so, no need,
ok the horn can fail many ways,
id not pick the most hard and most costly first.
ever seen a voltmeter?
on mine its hooked to 3 things, alarm, door locks, and horn button.
so are all 3 dead.????? if yes, id bet it not the button/or clock/spring.
cause an alarm ?
tell the doors, to honk with KEY fob actions. (its programmable)
if that fails. say so.

the horn can fail or its base not grounded.
horns love to fail for base rust. clean it?
hot wire the horn to see if hot honks, cost 0 . (jumper wire)
unplug horn and hot wiring , work?


the horn has no relay on JK its TRANSISTOR driven
from the TIPM. direct drive.
so best is to do an alarm first
why? TIPM gets serial commands off the Can-buss
top HONK
so if the TIPM hears (receives) no command to honk there will be no honking, its on a network now.
so say if you scanned it and had can buss errors to the TIMP
we'd work that first, not horn. SEE

at the dealer they can send a scanner command to the horn
in 1min, work, see it works.

so read the operators guide,
see that page on setting horn options try those.
if all fail , the car must be scanned !

its not wired like 1990 wrangler at all.
i have full docs. so.. ask questions.

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.

check the main fuse in the engine bay fuse box its a big one 80 amp this will have blown. doing this can also blow the ecu. but you may be lucky. horn going off is the alarm so this may have a problem to so would check this out as well.

The problem is likely with the clockspring in the steering column. The wiring for the horn button and the driver's air bag go through the clockspring. If you want to fix it yourself, I can probably find the procedure for you, but this is really a job for a professional auto electrician.

The likely cause of this is a defective rotating printed circuit coiled contact under the steering wheel, it is referred to as the "clock-spring" contact coil. To replace it requires the very dangerous airbag system be disarmed and the steering wheel removed, it is directly under the wheel. Before replacing any parts have the problem diagnosed to confirmed my guess work.

Your horn start by checking the fuse.

you have either a blown fuse or the factory wire harness isnt connected to horn first check fuse owners manual will have location and description of fuses if ok retrace your steps when you hooked horn to new alarm you disconnected wire at horn or you cut the wire to access horn wiring

hope this helps
plz vote leave a comment if need more help reply

you may have to replace alarm may have burnt it up

I've had this exact problem before when being jumped off. The fob DOES NOT make it stop. We removed the fuse that goes to the horn. As soon as your battery gets recharged from the alternator, the fob will work again and the alarm will quit sounding. The only pain about removing the fuse is that the cruise control will not work until you put it back.

the jetta has a faulty alarm system from the factory i have been working on one in my shop. the alarm moddule is inside the dash behind the light switch and has a 10 pin connector and a 6 pin connector. this can be bypassed if you disconnect both connectors and jump the two large wire on the 6 pin connectors, these wires operate your starter. the car will start and run but your alarm will no longer be active. the door locks and everthing else will still work. the only issue i am having is the factory radio isn't working because it is controlled by the alarm. but worse case scenario i can use an aftermarket radio if need be.