won't stay running starts and then turns off right after it strats

1998 CHEVROLET SUBURBAN
182,000 MILES • 5.7L • V8 • 4WD • AUTOMATIC
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ROLO97739
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It started with the left turn signal stay on but would not flash this only happens when I turned on the head lights it worked fine with the lights off. I was also having a problem with the bright lights not working for about a year so when this started to happen I replaced the turn signal switch. Once I replaced the turn signal that's when the starting problem startIng it starts up and then turns right off. Thank you for any help you can give me.
Mar 23, 2015 at 10:23 AM
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JDL
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With the issues you stated for starting, I'd have to check security system first. Can you check for trouble codes that relate to your security system? To check codes yourself, at the least, you need an obd2 code reader. When you changed the turn signal switch, you may have accidently caused a wiring issue?

I haven't looked at info/wiring for your security system, yet.

If this is the vats system, there is info all over the web about bypassing the pellet in the key. But, if the problem is somewhere else in the security system, bypassing that pellet won't help anything.

Anybody have any ideas, jump in, no problem.
Mar 23, 2015 at 2:51 PM
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JDL
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Just to add, you don't have the vats, you have passlock security system, fuel injector disable.
Mar 23, 2015 at 2:58 PM
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JDL
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Can you tell anything to point us at the security system. Is the security lamp on or flashing, anything? If security issue, there a relearn procedure that may or may not help?

Make sure the battery has a full charge. The procedure takes about 30 minutes or a little longer. Try to start vehicle, start and stall. Leave the key on, the security lamp should go off after about ten minutes. Turn key off 30 seconds and then do it again. The procedure 3-- 10 minutes. Hopefully after the last ten minute procedure, it will start.

It's possible that it isn't your security system?
Mar 23, 2015 at 3:15 PM