Question about 1999 Chevrolet Blazer

1 Answer

My '99 Blazer security alarm system goes off unprovoked.

This is a factory original system and I have found no reason for the alarm to go off (horn sounds and lights flash). I have to use the power locks to lock the rear gate and that seems to be a factor but not the only issue.

I have manually unlocked one of the front doors and manually relocked it thinking that would disarm the system but sometimes even that doesn't keep the alarm from sounding off.

Doesn't seem to matter if it is cold out or warm out. I've left the dome light off on the panel but that too doesn't seem to be a cureall although it seems to reduce the likelihood of the alarm going off.

Help! My neighbors are getting tired of the late night intrusions!

Posted by on

  • 2 more comments 
  • Anonymous Jan 06, 2009

    I have the same problem on my '01 Blazer and am looking for a solution.

  • Anonymous Mar 15, 2009

    I have the same problem also. If the doors are locked with the remote the alarm will go off. If the doors are locked by hand it will not. The dome light also will not go off but this is intermitent. I have unplugged all of the door switches that could turn on the lights and still the dome light is on. I have to use the dome overide button to make it go off. The Chevy dealer told me it might be the body control module.

  • Anonymous Apr 15, 2009

    I am having the same problem with my 99 Blazer. I am convinced that there is a sensor that thinks a door is ajar -- this causes the dome light to stay on (has to be overriden) and the driver side power door not to lock (can be locked manually). Occasionally, things go back to normal. I think this is related to the problem with the alarm, which seems to go off some time after the door is locked with the remote or with the power switch. If the car is left unlocked or locked manually, it doesn't seem to happen. I can live with the other stuff, but the alarm going off is driving me and my neighbors crazy!

  • Kris Stump
    Kris Stump Dec 01, 2015

    I am having a similar issue my 99 blazer is randomly locking and unlocking itself (even though I have the battery out of the remote) and then setting the alarm off. I am getting annoyed with it going off every 30-45 min it isn't provoked at all. I literally unhook my battery to keep it from going off. I need to know what to do. I was told from the Chevy dealer its a possibility that its a shortage in the wiring, but my mechanic said the automatic lock actuator could be the issue too. I am going to leave battery unhooked til I know what to do!!

×

1 Answer

  • Level 1:

    An expert who has achieved level 1.

  • Contributor
  • 1 Answer

How to turn the alarm system off

Posted on Oct 07, 2012

6 Suggested Answers

SOURCE: remote lock for back doors and rear tail gate door

Actually I found a solution. I remove the lock relay form the fuse panel and placed it back in place. I did not replace it. After doing this they worked. I probably need to replace the relay at some point, but for now that solved the problem. It was hard for me to believe that there is a separate relay for the lock and unlock circuit.

Posted on Sep 29, 2008

SOURCE: no dome light when passenger door open

Since the passenger door doesn't get used as much as the drivers door, check to see if the switch is not just stuck. It is a little button with a spring that opens up and turns the light on. It is located on the hinge area of the door and when the door closes it shuts off the switch, if it is not stuck then I would suspect said switch.

Posted on Jan 09, 2009

keemo68
  • 1263 Answers

SOURCE: Power door locks won't unlock + tailgate won't open

your issue involves the master control switch panel on the drivers side and or the passenger side as well some how the contact inside the switch assembly has either shorted out or no longer makes contact for the unlock side of the circuit. replace the drivers side panel switchs it's either a series of switc hs or mostimes one sigle board of switchs. you are better off going to an auto parts store rather than a GM dealership this will save you quite a bit on cash on the parts. now as to the rear tailgate. if it is electronic controled and there is an issue with the master switch you can,t manually unlock it because of a safty issue built in the system. you can manually unlock the passenger compartment doors for thew same reasons of safety but doesn't apply to the tailgate. just replace the parts and this will take care of the problem

Posted on Apr 18, 2009

  • 13 Answers

SOURCE: locks go crazy,alarm goes off, now the car won't start.

I've had this problem under warranty on my '05 Malibu LS. They replaced and reprogrammed the fobs. Looking in my shop manual, it seems the problem is from the content theft deterrent (CTD) system. My car started doing this two years later off warranty and now I just lock the doors from the outside with the key or by pushing the lock stem buttons by hand on each door. The security option in the DIC needs to be set to RKE for this to work though.

Posted on Oct 14, 2009

  • 1 Answer

SOURCE: alarm and door lock malfunction 1996 Camaro z28 LT1

Hey just wondering if you ever go this problem fixed. I am having the exact same issue. Thanks

Posted on Feb 24, 2010

  • 1 Answer

SOURCE: rear hatch 2005 chevy tahoe is locked & won't open

my 06 tahoe just got this problem...all other doors lock and unlock with the fab and door switch...but the hatch is in permanent locked mode. i cant even unlock the hatch window. why is this happening?

Posted on Mar 09, 2010

Add Your Answer

Uploading: 0%

my-video-file.mp4

Complete. Click "Add" to insert your video. Add

×

Loading...
Loading...

Related Questions:

2 Answers

How to check why my car alarm in 2006 nissan altima is not working


If it aftermarket(bunch of wires and modules under the dash on the drivers side) remove it. If it is still factory it takes a scanner.

Dec 03, 2015 | Nissan 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

The alarm( horn blowing & lights flashing). Happens unprovoked


Motion sensor. It's prolly set to sensitive.

Jul 31, 2013 | Cars & Trucks

1 Answer

E46 original alarm system


Factory system on hwat make and model and year.

May 16, 2013 | Cars & Trucks

1 Answer

Jeep alarm goes off for no reason after a few minutes


IT is probably just letting you know that it has received the lock signal and has secured the vehicle. Horn beps or clearence lights flask

Feb 03, 2013 | 1999 Jeep Grand Cherokee

1 Answer

Factory installed alarm keeps tripping itself and causing my van to not start.


Its better you reomove the installed alarm you dont have to remove and restore everything just 2 things the ignition that has be interrupted and the factory alarm in the hood just cut the alrm horn wire. For the ignition you will have to go under the console and remove the panel to access where they have interrupted the original wire. Identify the the ignition wires there you will see where they have splice a wire to a relay match thhe colors that they interrupted and restore that wire (its a 4 wire relay) use a but connection and ensure it does not fall apart start the car if the alarm horn goes off just cut it(NOT the car horn)cansmo_110.gif

Aug 28, 2011 | 1997 Chrysler Town & Country

1 Answer

My 1999 Bonneville will be sitting in a parking lot at work or at home and the alarm will just start going off. No one is around or close by with the keyless remote.\r\nWhat is causing this and can i...


A lot depends on exactly what is happening here. Are we talking about an aftermarket alarm system? If so, I personally would recommend removing the entire system - they are usually more trouble than they are worth! (Just my personal opinion based on 36 years of auto repair experience)

NOTE: The information below applies ONLY to problems with the FACTORY security system.

There is a possibility that the horns going off are not being caused by the alarm system at all. Some GM airbag modules/steering wheel switches have been known to short out intermittently and cause the horns to sound for no apparent reason. If the horn is staying on solid (BEEEEEEEEEEEEEEEEEPPPPP) then it is most likely NOT the alarm system. If it is beeping on and off at regular intervals (BEEP.....BEEP......BEEP...) and the headlamps are flashing, then the security system is probably at fault.

Low battery voltage or a shorted cell in a battery can "trick" your alarm system into "thinking" that someone is trying to steal your car. A THOROUGH battery and charging system check should be performed to find out if this could be the cause.

Also, your factory alarm is a PassKeyII system. This means that if there is a malfunction in the system, there is most likely one or more fault codes stored in the Body Control Module (BCM) that can lead you to the cause of the problem so you can get it fixed.

Please note that MOST generic code readers CANNOT access these type of codes.

Another way to work around this is to "disarm" the system. To do this, unlock the door using the key. Press the "unlock" button on the door. Then press the "unlock" button on the key fob (keyless remote). The system will disarm. When you leave your car, use the KEY, not the remote to lock the car. (If you use the remote, the system will be armed again.)

Aug 13, 2011 | 1999 Pontiac Bonneville

2 Answers

Have a 1998 lincoln continental that has factory alarm. but i dont have a keypad. i would like 2 disarm it, it goes off for no reason.


if its an aftermarket alarm, which im sure it is, find the brain to the aftermarket alarm and unhook it. trace the brain back from the car alarm siren hardware. it shoud b mounted somewhere under the hood. theres not a lot of available space in the engine compartment. so you should easily find the siren hardware. trace the wiring back to the brain and disconnect it. it cant be factory alarm. factory alarm only goes off when u dont use keyless remote or key to unlock a locked door or trunk. factory alarm blows horn and blinks parking lights

May 26, 2010 | 1998 Lincoln Continental

1 Answer

The factory alarm in my 2000 Trooper goes off 10-15 times per day for no apparent reason. So to avoid insanity I removed the fuse that controls the horn. Well, my alarm still goes of 10-15 times per day...


The usual cause of this is the alarm switch on the bonnet panel is too low and creeps up when you leave the car .

Just put some washers behind it so its snug when the bonnets shut down - I have done a few like his and its easier than disconnecting .

Jan 15, 2010 | 2000 Isuzu Trooper

2 Answers

1988 NISSON MAXIMA


If there is no original remote try to find a switch that may be hidden but accessible from the drivers seat, if the alarm is no longer needed find an auxilliary wire that may be on the battery or the fuse panel, if original there may be a fuse under the hood, pull the fuse and it should disable the alarn system.

Jan 06, 2009 | 1988 Nissan Maxima

Not finding what you are looking for?
1999 Chevrolet Blazer Logo

1,537 people viewed this question

Ask a Question

Usually answered in minutes!

Top Chevrolet Experts

yadayada
yadayada

Level 3 Expert

61249 Answers

Colin Stickland
Colin Stickland

Level 3 Expert

21949 Answers

Jeff Turcotte
Jeff Turcotte

Level 3 Expert

6812 Answers

Are you a Chevrolet Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides

Loading...