Question about 1985 Mercedes-Benz 300

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I need to unplg my horn under the hood. But I can't locate where it is. The alarm keeps going off when I apply my breaks, turn on my signal and open my car door. I want to unplug the horn to stop this from happening.

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It sounds like someone has played a prank on you, while under there look for any wires that look newer than the rest.

Posted on Mar 24, 2011

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1 Answer

Where is the fuse for the horn because it keeps going off


open the hood and look in the under hood electrical fuse relay center should be a relay that is marked horn or you can pull the fuse marked horn.must likely its the air bag on steering wheel.it coukd be the alarm but you would have to take to shop or get a book to help you, good luck

Jun 03, 2015 | 2000 Dodge Stratus

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How to set & cancel theft deterrent system or how to set & cancel security...


Theft deterrent system (on some models)

Theft deterrent system is designed to deter vehicle theft. The system flashes the turn signal lights and turns on the interior light or the signal lights only (depending on the model), and sounds security horn and vehicle horn when it detects abnormalities such as follows:

• Any door or hood is forcibly opened.
• The batter terminal is disconnected and then reconnected
• The system control is disconnected and then reconnected.
• Abnormal impact is detected when the impact sensor function is on.

The system flashes the turn signal lights and turns the interior light or the signal lights only (depending on the model), and sounds security horn and vehicle horn if someone attempts to damage or break into your car.

Setting the system

You can set the system with or without the impact sensor function. For details, see "Canceling the impact sensor" below.

1. Turn the ignition key to "LOCK" and remove it.
2. Have all passengers get out of the vehicle
3. Push the lock (set) switch on the wireless remote control key once. At this time, the turn signal lights flashes once and the security indicator light comes on.

The system is set after 30 seconds. At this time, the security indicator light start flashing slowly.

Once the system is set, you cannot start the engine until you cancel the system.

The system will not be set in the following cases.

• When any of the door is open; security horn sounds for 1 second, close the door and set the system again.
• When the hood is open; close the hood securely.

Canceling the Impact Sensor

The impact sensor can be cancelled to prevent false alarms from being triggered incase of the following conditions:

• When parked in the noisy area
• The vehicle body or glass is subjected to a strong impact from the (such as in highly pressurized car wash).
• When transporting by a car carrier or ferry.

To cancel the impact sensor;

1. Lock the door by pushing the lock (set) switch on the wireless remote control key once, and turn signal light flash once
2. Then push the lock (set) switch twice within 5 seconds. At this time, the turn signal flash 5 times to indicate the impact sensor function is disable.

The impact sensor is deactivated as long as the system remained armed.

Canceling the system

The system will be cancelled by the following two ways:

• Turn the ignition key from "LOCK" to "ON" position.
• Unlock any of the doors by pushing the unlock (cancel) switch

If the turn signal lights flash 3 times, the system has been alarmed. Check to see if there is any abnormality with your vehicle.

If any of the doors is not opened within 30 seconds, all doors will be automatically locked and the system will be set.

When the system is set

Activating the system; When the system detects abnormalities such as follows, it flashes the turn signal lights and turns on the interior light or the turn lights only (depending on the model) and sounds the security horn and vehicle horn of 30 seconds.

• Unlocking any door without using wireless control
• Any door or hood is forcibly opened.
• The battery terminal is disconnected and then reconnected.
• The system control assembly is disconnected and then reconnected
• Abnormal impact is detected when the impact sensor function is on.

Reactivating the alarm;

Once set, the system automatically resets the alarm after the alarm stops.

The alarm will activate again under the same circumstances described in "Activating the system".

Stopping the Alarm

The alarm will be stopped by the following two ways;

• Turn the ignition key from the "LOCK" to "ON" position.
• Unlock any of the doors by pushing the unlock (cancel) switch.

The system can be cancelled by these ways at the same time.

If the battery becomes discharged due to the vehicle being unused, for a long time etc., when the battery is recharged or replaced, the system will activate the alarm. If this happens, immediately unlock any of the doors by pushing the unlock (cancel) switch, and the alarm will stop.

Testing the system

1. Set the system
2. Insert a wireless remote control key into the key hole on the driver's door handle, and unlock the door.
3. Open the door, and an alarm will sound.
4. Stop the alarm by pushing the unlock (cancel) switch.
5. Repeat this operation for the front passenger's door.

Good luck.

on Nov 08, 2010 | Toyota Pickup Cars & Trucks

1 Answer

How to disconnect the alarm


Depending if it is a aftermarket or a factory alarm, they should all have fuses that can be removed. By removing the fuse, you may lose your keyless entry option. Most aftermarket alarms have a siren that is usually mounted under the hood in the engine compartment area. I've seen where people have cut the wire going to the siren to disable it but keep the power going to the alarm system to keep the keyless entry still functional if it came with the alarm system.
Factory alarms usually use the existing horn for the alarm. If that is the case, you might need someone who is experienced to disable the circuit so that the horn will not sound if alarm goes off but the horn will still be functional when needed. Hope this helps.

Dec 20, 2014 | Cars & Trucks

1 Answer

Bought a 1992 acura vigor and found horn fuse missing. when I replaced the fuse alarm goes off and constantly sounds. how do I stop it? I've read that there's a relay somewhere under the hood


horn relay located on the right side kick panel,you will see a row of relays,if horn relay is okay, more likely your horn control pad has a short inside causing horn button contacts to stick causing horn to keep blowing.

Oct 01, 2012 | 1992 Acura Vigor

1 Answer

Pontiac G6 Sedan Alarm


You have sensors all over the car designed to trigger the alarm. If they are of the normally closed variety, then one of them is stuck open so that when you turn off ignition the alarm is activated by the open switch. Locate all switches and test each and every one for opening and closing when activated. You will come across one that is open all the time. Replace it or jump it to remedy situation temporarily..

Sep 03, 2017 | 2006 Pontiac G6

1 Answer

I have a 1998 Toyota camry 4 cylinder and it wont start i changed the battery and got a new starter and it wont turn over at all thing is my alarm wont turn off either what can be the problem and how do u...


try this
Open hood ensure new battery is disconnected.
Open main fuse panel cover under hood and remove horn relay (so you don't have to listen to the horn).
Use the key to lock the drivers door.
Connect the positive battery terminal.
Connect the negative battery terminal (security system will now activate, hazards lights will flash and horn would be going off if the relay was not removed).
Use the key to unlock the drivers door.
Get in, close drivers door.
Use the key to start the engine.
Security system will deactivate.
Get out of vehicle, reinstall horn relay, replace fuse panel cover, close hood.

Dec 27, 2017 | 1998 Toyota Camry

1 Answer

Alarm keeps going off. what is the problem which fuse can i remove?


it is most likely going off because the sensor that sets the alarm off when someone bangs it or breaks the window is set to sensitive. Locate the adjustment under the hood near the firewall usually on the alarm module and turn it down.

Sep 19, 2010 | 2005 Chevrolet Cobalt

1 Answer

The horn honks when I reconnect the battery


Hi,
If the horn only honked once it may be a symptom of your car alarm being set off after power has been re-applied. If the horn stays on after you reconnect the battery you have either a stuck horn button on your steering wheel or a stuck horn relay. Or it could be the alarm sounding the horn but that usually that occurs in a series of horn blasts (rather than continuous) and the car indicators usually flash in sync with the alarm sounding.
If the horn is stuck on in a continuous blast ie not sounding on and then off and then on etc etc, disconnect one the battery cables then pull the fuse that feeds the horn or pull off one of the removable spade electrical connectors from one of the 2 terminals on the horn itself. Usually the fuse box is either under the dashboard on the drivers side or could be under the hood. Consult your user manual for your car for fuse and horn locations.
If the horn is stuck you need to visit a qualified auto electrician, or perhaps you have a friend who knows his way around auto electrics?
Cheers,
Steve (Melbourne, Australia)

May 12, 2010 | 2002 Acura 3.2TL

1 Answer

The alarm on my explorer keeps going off for no reason also it keeps beeping and saying door ajar....help


Mine started doing this about a year ago. My mechanic could not find the cause. I located the horn fuses under the dash and the emergency module under the hood and yanked them. Now the alarm still goes off at random, but it doesn't make any noise. That was the best I could do for the poor thing. Also I now have no horn, which has helped to teach my wife to be a more patient driver. She loved that horn.

Feb 26, 2010 | 2002 Ford Explorer

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