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How to hook up my car horn to my alarm

Have a honda accord 98 i purchase a alarm ASTRA 777i asked the tech if

he could wire it to the horn. but he toll me he needed one one more relay.
and that was going to cost me another 55 dollars if i wanted hook to the horn can some one help how to wire from alarm to relay to horn he toll me
if i dont use a relay i could burn the alarm.....can some one helpppppp....

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  • 44 Answers

It will not burn it up take the two wires from the siren and tape 2 wires of that and run them to your 2 horn wires and tape into the horn. Thats what i did and i havent had a problem since.

Posted on Jan 13, 2009

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SOURCE: how to hook up my car horn to my alarm

Your tech is mistaken. The brown/white wire will hook directly to the lt.green/blue wire at the steering column in your car. Might require some programming at the alarm module.

Posted on Jan 13, 2009

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How can i stop the alram every time i plug in the battery off a honda accord 2000 if the alarm is not manufactured by honda


Follow the alarm speaker (Horn sounding off) wiring. It will most likely go underneath the dash. Remove the box for the aftermarket alarm and all its wiring. (Not car manufacture harness) make sure to take it all out as certain models can leave vehicle unable to start if only partial removed.

May 22, 2015 | 2000 Honda Accord

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1995 accord horn not working.hear horn relay clicking but no current at horns when checked with test light. bad horn relay?


Check your wiring diagram and check for power coming out of the horn relay. Suspect a bad relay.

Oct 26, 2014 | 1995 Honda Accord

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98 ford escort horn goes off at night when its really cold


can be 4 things, as is true with all puters, as that is what it is.
1: bad inputs to the alarm (wires are corroded, shrink cold and fail)
2: bad sensors.
3: bad alarm processor.
4: bad outputs, ( the horn is a shared resource , so can be the horn stuck?)

to find this take real hard work. and tools for monitoring all inputs
to the alarm and see what fails. THE FSM covers all that
read the FSM and ask questions if any.

Jan 06, 2014 | 2003 Honda Civic

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Alarm horn will not turn off


do you have the alarm option, factory?
there are 2 horns
and 1 horn relay.
if the horn relay is energized, then the inputs to it are bad.
bad input is the horn relay has 12v across is coil pins, all the time.
so unplug the horn wires. silence.
then check relay , now that its quiet. is the coil hot?
hot means 12vdc across it. not thermal hot.
the relay on the 97 can be active for 2 reasons.
1: horn button stuck on, so pull that wire.Gray-org, at column
2: BCM is active same color, C2 in 13 is 0volts. (active)
if the BCM is honking the horn, we ask why, and that be alarm.
im reading at alldata.com so can you , under antithieft alarm sections.
if the alarm is activated, (is it) and any door switch is open, the horn honks.
if the gray-org. wires is at 12vdc , then the relay is bad
shorted, main contacts inside.
if the wire is 0v, its wrong.
ill stop, and wait until you find which it is, bad relay, bad horn button
or bad BCM or bad input to BCM.

Dec 04, 2013 | 1997 Jeep Grand Cherokee

1 Answer

I cannot locate the valet switch to disengage the alarm.


    Preparing for the Installation
  1. Step 1 Gather materials. You will need scissors or a knife, crimps, solder material, solder gun, test light, drill, screw bit, screws, tie wrap, double-sided mounting tape and a voltmeter.
  2. Step 2 Read the installation manual that comes with the alarm. Make sure you understand what the instruction manual says. If you purchased the alarm from an automotive store, you can always ask them some basic questions to help you get started.
  3. Step 3 Call the tech support number for manufacturer of the alarm and tell the tech advisor what kind of car you have. Ask what kind of locking system your car uses and what color wire to connect to in order to interface the lock/unlock feature of your alarm,
  4. Step 4 Ask the advisor how to hook up the relay for the door lock feature, what color wire to connect to for the starter disable feature, and how to hook up the relay.
  5. Step 5 Ask how to set up the voltmeter to test the door lock wires.
  6. Step 6 Ask how to access the factory door triggers.
  7. Step 7 Determine where you intend to place the components by referring to the installation manual.
  8. The Installation
  9. Step 1 Mount the siren to a solid metal surface under the hood. Point the horn of the siren down toward the ground so that moisture cannot collect inside it. Drill a hole through a rubber grommet in the firewall of the car and feed the siren's wire through that hole into the passenger compartment of the car.
  10. Step 2 Connect the alarm's power wire directly to the car's battery. Feed the wire through the rubber grommet on the firewall and into the passenger compartment of the car.
  11. Step 3 Put a fuse on the power wire next to the battery. Check the installation manual for the fuse size.
  12. Step 4 Mount the shock sensor as described in the manual.
  13. Step 5 Drill a hole in the dash where you intend to place the LED status indicator. Feed the LED's wire through that hole and place the double-sided mounting tape to the back of the LED and place it over the hole in the dash.
  14. Step 6 Locate the wires that work the car's power door locks.
  15. Step 7 Connect the door-lock relay to the lock/unlock wires and connect the alarm wire to the relay in the manner described by the tech advisor.
  16. Step 8 Using the advice of the tech advisor, locate the wire that works the courtesy light if the alarm has current sensing.
  17. Step 9 Connect the current sensing line from the alarm to the courtesy light wire.
  18. Step 10 Locate the factory door triggers if the alarm does not have current or voltage sensing.
  19. Step 11 Connect the factory door trigger to the alarm.
  20. Step 12 Find the starter wire on the steering column some inches below the starter switch. Cut the line and connect the starter disable relay. Connect the starter disable wire from the alarm to the relay.
  21. Step 13 Mount the valet switch somewhere under the dash.
  22. Step 14 Connect all the wires to the proper inputs and outputs of the alarm module.
  23. Step 15 Mount the module to a sturdy surface under the dash using the drill, screw bit and screws.
  24. Step 16 Use the tie wraps to secure the wires of the harness and stuff it back under the dash.
  25. Step 17 Arm the alarm and test its performance.

Jun 01, 2010 | 1998 Ford Taurus

3 Answers

I came back from vacation my 2000 honda accord would not start battery is dead. I got a jump from someone. The car started right up but the horn continuously blows and wont shut off. Had to have car towed...


replace the horn relay;or the horn button on the steering wheel is grounded and energizing the horn. any maintenance involving the steering wheel can be dangerous becaus of the air bag. if you just want to stop the horn, remove the relay, probably located in the fuse box under the hood. check the manual for location, but if your state has a safety inspection it will need to be fixed before the inspection is due

Apr 14, 2010 | 2000 Honda Accord

1 Answer

98 honda accord car alarm will not let car start.


Try chaning the main relay. It is $60 at the dealer, cheaper on e-bay. There is also a way to repair the sodlering connection on it if you want to try and save some money. Check youtube for a video on how to rapir main relay on Honda's. Any questions, e-mail me at edwardmgomez@hotmail.com

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Unlike before, now my astra 777 only unlocks the


may be a loose wire on the remote locking system, cheers

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How to hook up my car horn to my alarm


Your tech is mistaken. The brown/white wire will hook directly to the lt.green/blue wire at the steering column in your car. Might require some programming at the alarm module.

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98 sl2 horn replacement with car alarm


You need to wire a relay to the horn wire first and then run the wire from the relay to the horn. You need to get a single pole relay. go the auto parts store and tell them what you are doing and they will sell you a basic horn relay. The stock horn had a relay attached to it.

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