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Installed a new ingintion switch know security light flashes and car will not start

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This process will take about half an hour to doyou might want to put a battery charger on it on the low setting because if the battery dies in process u have to start over.first thing is try to start car,it might start then stall,when that happens leave the key in the on position and the security light will be flashing and it will keep doin it for 10 minutes,then it will stay on solid,when it does that turn the key off for 2 seconds then turn it to the on position anfd the light will be flashing agian for 10 minutes,then it will be on solid,then turn the key off for 2 seconds and then back on and 10 minutes later when it stops flashing this time u should be able to start it and the light should be off,hope this helps

Posted on Sep 23, 2009

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1 Answer

How do I program new key switch to car after installing a new one


1999 you had to put ignition on and wait 10 minutes until security light stop flashing and came solid now it is program .Switch must be brand new ,from scrap wont work, 2004 ?

Dec 06, 2014 | 2004 Chevrolet Impala

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Car trys to start but won't Car acks like it wants to start but won't


This problem can be from a problem with the security system. To test this theory on most cars turn the ignition to on and see if the security light continues flashing. If so this may be the problem. Most owners guides will tell you how to reset the system so the car will start. If not, one thing to try is leave the ignition on for a long time (10 minutes or so). When the security light stops flashing the car should start. This problem seems to be from the car ageing and the key not working as when the car was new.

We have used compressed air in the ignition and then put wd40 on the key and run it in and out. This seems to help with the recurring problem but doesn't make it go away.

I don't know the permanant fix. I suspect a new ignition switch which is not a cheap fix.

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You need to relearn the passlock system (security). There are 2 ways. One is with a scanner, which most diy'er wont own an expensive one to do it this way, here is the manual way. Start the truck and let it run until it dies. The security light should then be flashing. Leave the key in the run position until the security light stops flashing (about 10-15mins). After the light stops flashing turn the key off. Try to start the truck again. It should do the same thing (run for a few seconds and then die with the security light flashing). Again wait for 10-15 mins for the light to stop flashing and then turn the key off and repeat the process one last time. That's a total of 3 times. Once you finish the process the 3rd time. Let the truck sit for a minute with the key off. It should now be programmed and start and run normally.

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Died while driving


Are you aware of the stall problem that is caused by a fauty ingintion switch? Contact the dealer with your VIN in hand ask them if you fall under that recall.

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I have an 06 trailblazer ext lt. this morning it started and immediately stalled, followed by no starter response when attempting to start. security light is not flashing, and has a new ignition switch....


My first thought was the security system, but you say the light is not staying on or flashing.
So my next thought is the transmission select switch. The computer may not know which gear the trans is in. Will it crank in neutral ?

May 28, 2013 | Cars & Trucks

1 Answer

When I try to start car, it won't start and security light blinks. I'v e had to ignition switches put on before and I had a new key made. Car still won,t start.


If any of the gauges are blinking and going haywire and the security light flashing then the instument cluster is faulty.But if it is just the security light flashing then its in the switch.If you only had the switch replaced then you need a new ignition lock cylinder because its worn out.

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sounds like you need a new ignition switch the pass lock is screwing up common.

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