Around six months ago, door light would stay on and alarm would go off every hour or so. Put W240 on all door locks. Worked great solved the problem. No door light or alarm going off. Last couple months door light would stay on but no alarm. Then it would go off and come back on a couple weeks later. Now last few weeks door light has been off but the alarm won't stop going off about every hour or so. I really just want to rip out the alarm. What could be wrong? Easy fix?

My car has 220000 miles.
My car has an automatic transmission.

Experienced mechanics share their insights in answering this question :
Hello. I think you have a faulty alarm system. You may want to try to disconnect the alarm system and reconnect it to see if you are getting the same problem. I believe your lights and alarm system problems are connected. Your door sensors could be bad, too. Have them replaced and you may get the results you are looking for. If your weather seals are bad this could cause a problem, too.

How to Identify and Fix Common car Problems ?

Our sources include academic articles, blog posts, and personal essays from experienced mechanics :

 The perimeter alarm is a deterrent against unauthorized access to your vehicle through the doors and the hood. It also protects the audio unit. If the alarm is triggered, the alarm horn will sound and the hazard warning flasher will flash.
There are simple instructions if you want to know how to disable a car alarm permanently. You should just unlock the door, start the car, remove the fuse, or disconnect the battery of the car. When working with electronics, it`s crucial that you guard yourself against injury.
To deactivate your alarm system, put your key into your driver`s side door lock and partially turn it—but don`t unlock the door. Keep your key in this position for 40 to 60 seconds, then repeat this exact process with the key turned in the opposite direction. After 60 seconds, take out your key and start the engine.
What are door sensor alarms? In door contact access control systems, sensors play a crucial role in detecting the status of a door, such as whether it is open or closed. Door and window sensor alarms are actually the same device.
The system arms when you lock your vehicle. When armed, the alarm is triggered in any of the following ways: If someone opens a door, the liftgate or the hood without a valid key or remote control. If you switch your vehicle on without a correctly coded key.
A few cables and speakers make up your alarm, so it`s difficult to remove the entire system. That said, you can essentially remove the car alarm by taking out the alarm fuse. To remove the fuse: Look in your owner`s manual for the correct fuse.
Its because you probably used the fob to lock it and when you do that, the fob also arms the security system. the alarm will also go off if you get inside the car, then lock it with the fob, then open the door. Try locking your door with the key instead of the fob, and the alarm will not go off when you unlock it.

Relevant Questions and Answers :

the most relevant questions and answers related to your specific issue

In a keyless entry car, can you also have an alarm say auto watch alarm system installed?
ANSWER : Hello. From what you describe it would appear that the aftermarket alarm system may be having an issue. If the alarm has done this since it was installed then it may be possible that it is wired improperly, or that there is an issue with the alarm system control module. It may be possible that the two alarm systems are interfering with each other somehow, perhaps due to an issue with the transponders or remotes. I would recommend referring to the alarm system manufacturer, or the shop or technician that installed the alarm for more specific support or instructions.

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Alarm goes off even when engine is running
ANSWER : Hi there. It really depends on what was removed with the Toyota factory alarm that would pinpoint the source of the sound you are hearing now. In some cases, a mechanic will simply pull a fuse that powers the alarm siren to disable the device, while others will fully remove the system. However, due to the fact you had existing electrical problems, it is conceivable that the noise is being triggered by an electrical fault of some sort; either a sensor, connector or exposed wire. It would be a good idea to have a professional mobile mechanic come to your location and complete a car is making a noise inspection, so we can pinpoint the source of the noise and recommend the right repairs.

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Car won’t start. Alarm keeps going off (aftermarket alarm)
ANSWER : Hello. From what you describe, it would appear that your vehicle has experienced some sort of electrical issues. It may be possible that the alarm system has been set off or has perhaps malfunctioned, and as a result is cutting off power to the vehicle. If the alarm is an aftermarket one, I would try to determine what model or type it may be to see if instructions can be located, perhaps on the manufacturer’s website.

I would also take a close look at the battery, especially if there are no lights or power coming on. There can certainly be cases where the alarm system, or even another system on the vehicle, experience a wiring issue, such as a short to ground, which can drain the battery. I would check to see if the battery is charged, and from there proceed to the vehicle’s fuses and relays, and then the alarm system.

If you are not comfortable checking this, a certified technician, such as one from YourMechanic, can come to your location to properly diagnose the starting issue.

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Car alarm is going off when using clicker to unlock the car
ANSWER : The content theft deterrent (CTD) alarm will sound when either the door is opened without using the key to unlock the driver’s door, or when the door is unlocked without using the unlock command from the keyless entry transmitter. My guess is that, for some reason, the control module is not recognizing your key fob. Instead of locking your doors with the remote, try locking them manually. This should solve your problem. You can also deactivate the CTD by doing the following:

Press either door lock switch.
Use the key to unlock the driver’s front door.
Press the unlock button of the transmitter.
Insert the key into the ignition and turn the vehicle on.

Of course, these are work arounds. For a permanent fix, I suggest you have a trained professional diagnose your initial starting issue and other causes to repair your vehicle.

Read Full Q/A … : Alarm

how can i bypass my sanji alarm it cuts my engine out completely if i put my ignition on and press the alarm button nothin goes on
ANSWER : When these aftermarket alarm systems start to not work there is no way to fix it. Unfortunately you will have to replace the entire system or remove it and convert back to the original wiring connection. Doing either of these things will fix your problem. If you’d like a second opinion on this, feel free to contact a certified technician, such as one from YourMechanic, who can come to you and diagnose your starting issue firsthand. Good luck.

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Iam unable to activate the alarm
ANSWER : Hi there. It looks like you have completed all the steps a mechanic would typically complete to try and activate the alarm. It’s likely that you have an electrical problem that should be inspected by a professional mechanic.

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Problems with alarm
ANSWER : If you now have a key that fits the door you will have to hook up all the wires back to normal. After this is done, disconnect the battery and wait at least ten minutes. With all of the doors closed and locked, reconnect the battery. Unlock the driver’s door and see if the ignition turns and starts the vehicle. If the theft light is still flashing then try and unlock the drivers door to see if the alarm stops and the vehicle starts. If it now starts then the drivers key lock cylinder will need to be replaced.

If you need some assistance with these checks, consider enlisting a qualified technician who can diagnose your starting issue and perform the necessary repairs to your vehicle to get it going again.

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When I set the alarm only the left side indicator lights flash, the right no light flash. the alarm work OK.
ANSWER : When the alarm was installed the alarm output wire for the lights need to be tied into a parking light circuit or turn signal circuit. Whom ever installed your unit hooked the light output wire to only the left turn lights. There is not a problem and if you wanted it to be fixed it would need to be rewired.

Read Full Q/A … : Alarm