If the security system is armed, which it can be whenever the battery power is unhooked then hooked up again as the system thinks a theft attempt has been made, try this: Hook up the battery then lock and unlock the driver door using the original key. This will let the system know that you - the owner - have the key and are not trying to steal it. Not a guaranteed fix but works about 90% of the time.
SOURCE: security system/battery
plz check the following and update me
1. Fuel (To be exact proper air/fuel ratio, normally it is about 14/1)
2. Spark (in appropriate moment)
3. Proper timing (the valves should open and close only in appropriate time)
4. Compression in the cylinders (Normal compression is 120 - 170 psi. The engine won't start if the compression is lower than 70 - 80 psi.)
SOURCE: 2002 Ford Focus Doors lock with key fob, but horn does not honk
there are two seperate horns
SOURCE: 99 malibu horn honks shifting into D or R
wires from the horn run down the steering column and pass the area where the shift linkage is also in the column. its either a loose wire, or a chafted wire inside the column. Be VERY careful working on this if you have airbags. they must be disarmed before you work on the column.
SOURCE: 1992 Dodge Ram 50: Horn honks all by itself.
Check the horn actuating contact at the centre of the steering wheel. It may be damaged or mis-aligned.
Also check the carbon contact that runs on the slip ring under the steering wheel (associated with steering wheel horn actuate switch) It may be damaged or mis-aligned.
If none of the above are faulty, you should look for a possible intermittent short to ground on the horn actuation control wiring.
SOURCE: 2000 Tahoe Horn broken
You can remove the horn relay and use a Ohm meter and check the resistance between the horn relay connector terminal No. 86 (Black Wire) and ground. If the ohms are less then 5 ohms replace the horn relay. There are a lot more tests but as Polarcycle states you can do what he suggested other then I believe you have two horns in this vehicle.
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