Flashing security light after battery replacement?

If you have a security light flashing after battery replacement issue, here’s what to do: Chances are you left the key in the ignition when changing the battery. If so, disconnect the battery cables, remove the key, and then reattach the battery cables.

  • If you have a security light flashing after battery replacement issue, here’s what to do: Chances are you left the key in the ignition when changing the battery. If so, disconnect the battery cables, remove the key, and then reattach the battery cables.

Is my security light supposed to blink?

If nothing happens or the engine starts and dies, the security light will be flashing. Leave the key in the On position and wait ten minutes. The flashing light should go off or illuminate without flashing. When it does, turn the ignition off, wait twenty seconds, and then try to start the engine.

Why is my car lock flashing?

That’s the Security Indicator Light, and it’s blinking, it’s telling you that the car’s security sytem is armed. When the car is locked and off, the Security Indicator Light will blink steadily. It will trigger shortly after the engine has been turned off and the key has been removed from the ignition.

Why does my car keep saying security?

On your particular vehicle the security light staying on as the vehicle is running is an indication that the security system has failed and is disabled. It is common for a security light to come on after battery dies because the computer may lose its programming to the key.

How do I reset my security system?

How Do I Reset My Alarm System?

  1. Disconnect the backup battery. Open up the system, and disconnect the backup battery.
  2. Unplug the transformer. Locate the transformer, and unplug it from the wall outlet.
  3. Power on. Plug the transformer and the battery back in.

How do I reset my immobilizer?

Hold the panic button for five seconds to reset the immobilizer. Then press the lock button twice and wait ten meters from the car for ten minutes.

Why is the theft light blinking?

The Anti-theft Light in the dash of your car should flash periodically to show that the system is engaged and active. You have to lock the doors of the car (without it running) for the alarm to engage.

Will disconnecting battery reset anti theft?

It is another way to solve the problem of anti theft system car wont start. Disconnect the positive terminal of the battery for a minute or two. It will reset the computer system and your car is likely to kick off.

Does the security indicator light drain battery?

Yes it will drain your battery but should take so long its not a problem.

Why did my car go into anti theft mode?

The anti-theft system of your car may not work properly at a certain time. This may be for many reasons, including a dead car battery that loses memory of your key or a dead remote control battery. It may also be that the immobilizer chip is damaged on your key or the car door lock is damaged.

What does security warning light mean?

The security Warning Light is located on your instrument panel. When the security Warning Light is illuminated, that means that the theft-deterrent system may not be working properly. Tip Like all warning lights, the security Warning Light will briefly illuminate when your vehicle is turned on.

Why does my security light stay on?

What Causes my Light to Stay On? Several things can cause your motion detector to stay on, including age, storm damage, a power surge, improper installation, and improper settings.

What does security indicator light mean?

The Security Indicator Light illuminates to indicate that the security system is either working properly or to let you know that there is a fault in the system. While starting the car or key in the ‘run’ position, the security lamp should illuminate briefly then go out. This a “bulb check” and is also normal.

Flashing security light after battery replacement

After replacing the battery, the security light begins to flash. If you have a security light that is flashing after replacing the battery, use these steps to resolve the problem: When you changed the battery, there’s a good chance you left the key in the ignition. If this is the case, detach the battery wires and remove the key before reconnecting the battery connections. If the security light or horn beep continues to illuminate, consider restarting the car. Otherwise, click the panic button on your remote control and attempt beginning the game once more.

Leaving your key in the ignition while disconnecting the battery causes the transmitter to attempt to receive a signal while it is still receiving power from the new battery.

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If none of these solutions work and the security light continues to blink even after replacing the battery, you’ll need to have the problem codes read at a dealership.

Rick Muscoplat’s 2015 Rick Muscoplat’s Rick Muscoplat posted a blog entry on

Also interesting

Anti Theft light still blinking after a new battery install

After replacing the battery, the security light will flash. Listed below are the steps to take if your security light is flashing after you replace the battery. When you changed the batteries, there’s a good chance you forgot to take the key out of your ignition. The battery cables should be disconnected first, then the key removed, and finally the battery cables should be reconnected. Try starting the car again to see whether the security light or horn continues to illuminate. Otherwise, click the panic button on your remote control and try starting the game from the beginning.

  1. However, before your key can create a response, it must first receive a broadcast from the transmitter that is situated around your lock cylinder.
  2. Because it couldn’t find the correct key, it triggered the flashing security light.
  3. It’s possible that a difficulty code has been saved in the computer every time a warning light flashes.
  4. Rick Muscoplat wrote a post on

Why Do Car Lights Flash After a Battery Change in a Subaru Impreza?

Getty Images/Getty Images News/Bryan Mitchell/Getty Images After replacing the battery in your 1999 Subaru Impreza, the parking lights, along with the radio and dash lights, will blink until the security system has been reset.

Resetting the system does not need the use of a scan tool; instead, just these three options are available for resetting the system. If one of these procedures does not work, it is necessary to have the system evaluated.

Pick a Method

Getty Images News/Bryan Mitchell/Getty Images News After replacing the battery in your 1999 Subaru Impreza, the parking lights, along with the radio and dash lights, will blink until the security system is reconfigured. It is not possible to reset the system using a scan tool; the three techniques listed above are the only options available. A system diagnosis should be performed if one of these procedures fails to produce results. Mike Vasick is a writer who has worked in the car repair industry for more than 25 years.

Vasick has also worked managerial roles in both dealerships and national chain stores, and has spent several years working online, assisting both DIY clients and auto repair companies with their car repairs.

More Articles

Mike Vasick is a writer who has worked in the auto repair industry for more than two decades. For Nissan and Subaru automobiles, he holds factory certifications in repair. Aside from that, Vasick has had managerial roles in both dealerships and national retail chains, and he has spent several years working online, assisting both DIY clients and auto repair companies with their car repairs.

car died, security light flashing rapidly, wont start. any ideas>?

I’m having the same problem, albeit it’s a little different. Experiencing a similar problem: I was traveling along today at 25 mph and 3000 rpm when, for no apparent reason, all of the dash lights turned on and the odometer and speedometer both fell to zero, despite the fact that the engine was still running and the road was dry. When I turned off the car, I received the quickly flashing security light, and the engine failed to start. After 10 minutes, I tried to start it again and it worked, despite the fact that the CEL and DSC/TCS lights were on.

Similar reported difficulties include:I have checked any fuses that can be physically checked and they are all OK, no repair has been done on the car in the recent past, and the only reason I’ve gone into the engine room is to check the oil level.

Is there a possibility that the ignition receiver module is malfunctioning?

That annoying blinking security light.

Hello everyone, here is my first blog article. I hope you enjoy it. Rather than asking a question, I thought I’d give a remedy to others who are coping with the **** blinking security light on their computer. The security light on my 1990 N/A 2+2 started blinking as soon as the power was restored, and it refused to turn off even when the doors were closed. I had just installed a new battery in the vehicle when the problem occurred. I was concerned that this might result in the death of my new battery (it certainly finished off my old battery which was struggling to hold a charge since the car had been sitting for a while).

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I double-checked everything, and all of the boots on the sensors appeared to be in good condition, so I assumed it had to be something else.

Mine ceased operating some years ago, and despite the fact that I should have had an after-market unit put, I just never got around to doing it (which I know will come back to bite me in the ass; someone actually tried to pry one of my t-tops off with a crowbar while I was parked in West Philly a few years back.).

  • Finding a thread (i=317601 t=317564) with a schematic (given by Zazupilot) and instructions (supplied by slobo7x), I was able to quickly and simply detach the TWCU, and it was successful.
  • Because I had the panel open, I thought I’d snap some photographs to provide a better visual walk-through of how to disable the TWCU in accordance with slobo7x’s recommendation.
  • If you know for a certainty that your alarm does not function, or if you are aware of the dangers associated with driving without an alert, then you should proceed with caution.
  • Only a 10mm socket wrench will be required (while a Phillips head screwdriver may be used to remove the first set of bolts, you will still require a wrench to remove the Theft Warning Control Unit).
  • 1 – Remove the carpet from the passenger’s side.
  • 3 – Remove the wooden board as well as the two bolts that are keeping the TWCU in place.
  • That’s all there is to it, really.
  • Hopefully, this will be of use to those who are also being tortured by that security light and are concerned about the life of their batteries.

If you’ve come across this thread through a search and it appears to be a little stale, please feel free to contact me at the e-mail address mentioned on my profile page if you have any questions. Thanks for visiting! -PatrickPost has been edited (Apr 20, 9:04pm)

Security light flashing

  1. On 09-12-2016, the security light began to flash.GT Level Member In my possession is a 00 GTP, in which I have recently completed the engine change. Having turned on the engine, the security light has begun to blink for around 10 minutes until it goes out completely. The car starts up and operates perfectly, with no error codes. I followed the security 30 minute retraining routine, however it did not resolve the issue. What is the plan for the rest of the day? I didn’t notice this issue until after the engine switch.
  2. 2Re: Security light on and blinking 09-12-2016 I consume alcoholic beverages. As a result, keep this in mind when reading my postings. 2Re: Security light flashingGT Level Member 09-12-2016
  3. 3Re: Security light flashingGT Level Member 09-12-2016
  4. 4Re: Security light flashingGT Level Member 09-12-2016 Member at the GT Level on September 13th, 2016. I’m beginning to believe that this has nothing to do with the engine swap, but more with the battery having been detached for an extended period of time. When I detached the battery and changed the Cam position Sensor in the past, it behaved in a nearly identical manner, however it would shut down after 3 seconds. I’m also wondering whether I did something incorrectly during the retraining. The following procedure was begun immediately after turning off the automobile, without waiting at least 30 seconds. The technique I used to retrain was outlined below. Does it occur to you that initiating the operation without waiting after turning off the automobile may have had an impact on the outcome? Turn on the ignition with a master car key while the engine is still turned off. Keep an eye on the security indicator. The telltale (security light) will turn off around 10 minutes after it has been turned on. Remove the key from the ignition and wait 5 seconds. Steps 1-3 should be repeated two more times for a total of three cycles or 30 minutes. Important: When the ignition switch is turned from OFF to RUN, the car learns the key transponder information and/or passwords stored in the transponder. Before attempting to start the car, be sure that the ignition is turned off. Start the car using a master vehicle key in your possession. Either the car has learnt the keytransponder information or the ECM has learned the fuel continuepassword, depending on which is the case. If extra keys are necessary to be mastered, they are as follows: Adding KeysIt is critical to note that the following is true:
To initiate, this procedure requires that a learned master key be available.
A total of 10 master keys or valet keys may be programmed to a single vehicle.
This procedure adds keys only. The procedure does not erase previously learned keys.
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The keys to be learned must duplicate the mechanical cut of the current key.
If more than one valet key is to be learned, immediately precede each valet key with a learned master key.
  1. Turn on the ignition with a previously learnt master key while the engine is still turned off. Remove the key from the ignition and turn it off. Insert the key that has to be mastered within 10 seconds. With the engine turned off, turn on the ignition. The car has now been taught how to use the new key.

5Re: The security light is on and flashing. 09-13-2016 I believe you are conflating the process of adding a new key with the process of setting up security. and whether or not the automobile starts, cranks, or runs. You do not have a genuine security-related problem. Because if you required a security system, the automobile would not even turn on. Alternatively known as a dead key. .and that only occurs if you change the pcm, or the pcm’s bin file, to a different osid. It is a 1998 Buick Regal GS with F body brakes, Caddy STS wheels, tinted tails, an L36 bottom end with gently ported heads, 1.95 roller rockers, headers, and a Gen 5 N* 3.0 pulley, as well as a BrandonHall rebuilt transmission, DHP tuned, and AEM water/Methinjection.

Member at the GT Level on 09-13-2016 Anyone have a clue as to why the Security Light is flashing for the first 10 minutes of driving time?

I’m simply trying to figure out what’s causing the light to flash so that I can fix it as soon as possible.

09-13-2016 I’m not sure, but if it’s up and running, that’s usually a good thing, right?

It’s possible that it has a pending code saved.

8GT Level Member09-13-2016Originally Posted byScottydoggsRe: Security light flashingGT Level Member I’m not sure, but if it’s up and running, that’s usually a good thing, right?

The swapped motor is performing well; it’s just a shame that the darn LED is blinking right now.

I do not have access to a Tech 2.

Member at the SE Level09-13-2016 My 2000 GT has been behaving in this manner for several years.

It takes around ten minutes for the car to start and the security light to cease blinking.

4fanintexas originally posted this on 09-13-2016 at GT Level Member.

I have no idea why.

As far as I could tell, that was just my automobile trying to reassure me that I was safe.:-) I despise it when things aren’t quite right.

The theft deterrence module appears to be the source of the problem for the time being, assuming it doesn’t retrain itself.

11Re: The security light is blinking.

You never know, electronics can be a little wonky from time to time.

On the 13th of September, 2016, the security light was flashing.

Remove the battery for an hour or so and see whether everything is working properly when it is reconnected.

I gave it a go over the weekend.

13Re: Security light is flashingGT Level Member09-14-2016Re: Security light is flashingGT Level Member Well, it’s clear that it’s not a retrain issue because I tried three times last night.

I’m beginning to wonder whether it’s possible that I overlooked a wire or ground during the engine transfer. GT Level Member09-15-2016Re: Security light flashingGT Level Member09-15-2016Re: Security light flashing

I find itcurious that this happened after a motor swap, but then previously when Ihad thebatterydisconnected to change a cam position sensorthe security light was flashing, car would start and die with in 3seconds with the master key, but would start and run on Valet key.Igot a new key and did the relearn to fix that problem, but all the oldkeys also were able to be relearned again, so I don’t believe the keywas the problem.So now after reconnecting the battery this time, the security light blinks but the car starts and runs fine with the light going out after 10min.I’m surprised there hasn’t been a class action suit against GM overthis issue.Thereare thousands of posts on the internet, but no oneever posts what the exact fix is and the cost of the repairs rangebetween $100 to $1000 with some never being fixed.Ridiculous.

On the 10th of March, 2016, the security light flashed.GT Level Member An intriguing little update to share with you. I replaced out the theft deterrent module, but that didn’t fix the problem with the flashing security light, so I unplugged the theft deterrence moduleplug out of curiosity, and now the security light isn’t flashing anymore and the car still starts and operates. Lmao, I get that it isn’t intended to begin running immediately but it does and I don’t have to stare at the flashing light for the next 10 minutes.

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