Security light flashing?

Tiny
TRITAN1889
  • MEMBER
  • 2002 CHEVROLET BLAZER
  • 6 CYL
  • 2WD
  • AUTOMATIC
  • 135,000 MILES
How do I reset my car alarm system I have tried turning the key two times to the locked position and then two times to the unlocked position and it's still engaged
Wednesday, August 26th, 2009 AT 7:44 AM

23 Replies

Tiny
2CARPRO JACK
  • MECHANIC
  • 11,533 POSTS
It should disarm when you unlock the drivers door.If not try the passenger door.If neither one of those works, you may need to have a shop scan the BCM to see where the lack of communication is happening. I take it this is a factory alarm and not an aftermarket

This guide can help

https://www.2carpros.com/articles/how-to-reset-a-security-system
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Wednesday, August 26th, 2009 AT 7:53 AM
Tiny
TRITAN1889
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Yes It is a factory system, but I have tried both of the doors with the key and even tried turning the ignition on for fifteen minutes and nothing
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Wednesday, August 26th, 2009 AT 11:06 AM
Tiny
2CARPRO JACK
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Are we talking flashing external lights or just the security light in the dash? You may be looking at having it scanned to see where the loss of comunication is. Are you using the original key?
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Thursday, August 27th, 2009 AT 7:21 AM
Tiny
TRITAN1889
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No flashing lights but the security light use to blink, but now it is on steady. The car was turning over but wouldn't start and now it won't even turn over. My wife has the original key but I have a duplicate key
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Thursday, August 27th, 2009 AT 10:29 AM
Tiny
2CARPRO JACK
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May want to try the other key, also follow this procedure

1- Turn key to RUN position, try to start and let key return to ON position
2-After approx. 10 minutes the security light should turn off
3-Turn ignition to OFF position and wait 5 seconds
4-Repeat steps 1-4 two more times for a total of 3 cycles equaling 30 minutes
5- Start engine
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Thursday, August 27th, 2009 AT 10:39 AM
Tiny
2CP-ARCHIVES
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  • 2000 CHEVROLET BLAZER
  • 100,000 MILES
On a 2000 chevy blazer how do you reset the security?
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Tuesday, January 8th, 2019 AT 10:40 AM (Merged)
Tiny
ASEMASTER6371
  • MECHANIC
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Hello,

Here is a guide to help you reset the security system.

https://www.2carpros.com/articles/how-to-reset-a-security-system

Please let us know if you need anything else to get the problem fixed.
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Tuesday, January 8th, 2019 AT 10:40 AM (Merged)
Tiny
CURTHINER
  • MEMBER
  • 1 POST
  • 1999 CHEVROLET BLAZER
  • 6 CYL
  • 4WD
  • AUTOMATIC
We have replaced the computer in our blazer, do we need to reset the security system now? If so how do I do that. Is it possible to remove the security system. We are thinking the security system will not let the injectors work. Thanks
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Tuesday, January 8th, 2019 AT 10:40 AM (Merged)
Tiny
JACOBANDNICKOLAS
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It needs to be reprogramed to recognize the system. Take it to a dealer that has the proper equipment.
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Tuesday, January 8th, 2019 AT 10:40 AM (Merged)
Tiny
ACTIONTP
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  • 2 POSTS
  • 1996 CHEVROLET BLAZER
  • 6 CYL
  • 4WD
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I was replacing my headlight bulbs, so I had to disconnect the battery to get to the right side bulbs. Well, when I connected the battery back, the car wouln't crank. Turn the ignition. And nothing! So, how do I reset alarm, or better yet, how can I bypass it? Please help. Thanks.
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Tuesday, January 8th, 2019 AT 10:40 AM (Merged)
Tiny
RHALL77
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Are you sure you have a good connection? Is the security light blinking? If it is try this. Turn the key off, turn the key on and crank the starter for a second and leave the key on. Watch for the light to blink. When it stops blinking, turn the key off for about 10 seconds and see if it will restart. Let me know what happends, we will see what else we can do for ya.
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Tuesday, January 8th, 2019 AT 10:40 AM (Merged)
Tiny
THREED
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  • 2001 CHEVROLET BLAZER
  • 6 CYL
  • 2WD
  • AUTOMATIC
  • 72,000 MILES
I have a 2001 Blazer Xtreme with shaved doors and a Viper Alarm. The Alarm and door poppers were working about a week ago, but now the remote for the alarm and door poppers won't work. When I push the button to turn the alarm on or off, it won't do anything. Also, I can't get the remote to pop open the doors. It is about 32 degrees here. Would that have anything to do with it? Thanks!
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Thursday, December 19th, 2019 AT 1:56 PM (Merged)
Tiny
JACOBANDNICKOLAS
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Hi:
The temp could have something to do with it. However, because it's an aftermarket system, we have no wiring schematics or instructions to help you. I will assume the battery in the remote is good, but further than that, nothing.

I would recommend returning to where you had it installed.

Joe
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Thursday, December 19th, 2019 AT 1:56 PM (Merged)
Tiny
THREED
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I found the problem. The battery was dead were it had been sitting in the cold. Thanks for the reply.
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Thursday, December 19th, 2019 AT 1:56 PM (Merged)
Tiny
GRACE1999
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  • 1 POST
  • 1997 CHEVROLET BLAZER
  • 6 CYL
  • 4WD
  • AUTOMATIC
  • 73,000 MILES
This is my first car that I own. I am having problems with my alarm system. I have Vesco Electronic Security System built into. When I want to start the engine I have to turn off my alarm. What do I need to fix so I don't have this problem again in the future? Also How do I set the alarm so I can use it?
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Thursday, December 19th, 2019 AT 1:56 PM (Merged)
Tiny
SWILLIAMS
  • MECHANIC
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Most alarm systems have to be off for the engine to start. They would not be much good if the alarm allowed the engine to run with it armed.

Now if you mean you also have remote start with this system and that isn't working you need to see if the alarm system is malfunctioning.

Sounds like you also need the manual that came with the alarm.
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Thursday, December 19th, 2019 AT 1:56 PM (Merged)
Tiny
SCORPEON44
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  • 5 POSTS
  • 1996 CHEVROLET BLAZER
  • 4.3L
  • V6
  • 4WD
  • AUTOMATIC
  • 1,995 MILES
I bought the vehicle listed above that had the key cylinder pulled out. I have a 1997 with a bad engine. I took the key cylinder from 1997 in 1996 and after about two times of cranking it the fuel pump had stopped working. I diagnosed everything to the best of my knowledge and finally I decided the security had to of shut the car down So iBook said steering wheel off and swapped everything in column related to security. Key cylinder, wiring harness, switch, etc. The only difference was 1997 shifter in floor were as 1996 shifter is on column. I am assuming neutral safety on is under the dash instead of on column so I spliced the wire. After reassembling still nothing. Oh, I was going to swap brain as well which is where I am in the swap and the numbers are totally different. Can I swap? Should I swap? Where to now? I am sure I have missed something.

Wanted to add I have the title for this car. It is not compromised is any way. The differences of opinions on what can be done is varied. I have made all the changeover from 1997 to 1996. The car is not valued enough to take to a mechanic or dealership so if this can be done if someone knows I would very much appreciate the help. If not then a reasonable explanation would also be appreciated. Thank you.

Thank you in advance for your time
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Thursday, December 19th, 2019 AT 1:56 PM (Merged)
Tiny
HMAC300
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Today's cars when ignitions are broken and replaced with new or used parts the security system is VIN number matched so when the PCM is activated to start it will not, because the parts you replaced do not match the VIN number. A mechanic can do this with his scanner. So if the car is not worth $100.00 or so if it still ran well and got you where you were going then it should be done.

You might want to put it back together and fix the splice take to a mechanic so he can program it correctly.
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Thursday, December 19th, 2019 AT 1:56 PM (Merged)
Tiny
SCORPEON44
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Thank you for the helpful reply.
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Thursday, December 19th, 2019 AT 1:56 PM (Merged)
Tiny
1839RYAN
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  • 1 POST
  • 1995 CHEVROLET BLAZER
  • 157,000 MILES
The alarm light also is blinking different now that it has stopped working.
I think the problem came form me hooking up windsheild washer. The front wind sheild sprayer worked fine, but the rear sprayer I find was not connected inside hatch door the hose was I guess just spraying in hatch door which caused damage. I was reading that it could be the alarm module? Not sure where that is located?
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Thursday, December 19th, 2019 AT 1:56 PM (Merged)

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