i have an aftermarket security system on my 99 sle....lately my security light came on for the stock security system...so i called the dealership they told me to call the place where it was installed so i did so....the only thing hooked into the stock alarm is the door locks..and they said as long as my remotes working everythings ok....so now my problem starts...every so often my car wont start...the battery gauge reads low and the security light comes on for one minute...but then if i let it sit for say 5 minutes it will start right up no lights or nothing...???????this just start two days ago im stumped, i scanned it and i cant find nothing for codes......anyone got any ideas on what this could be

Do you have the VATS resistor pellet in your key? If so, have you tried your spare key? Maybe try cleaning the vats contacts in the ignition switch tumbler with alcohol and a q-tip.

i havent tried cleaning it, i'll have to though...its so odd, that it wont start...then after the security light goes out it will fire right up....hopefully its as easy as that

Sounds like the classic symptoms of a bad key/resistor pellet to me.

You mean to say that the key will mess things up like that . I ask cause I was reading this subject and my car has ben doing some odd things. The other day all the gauges went off while I was drive and came back on a few times. Also every once in a while the air bag light and traction control light come on and stays on. Once I shut the car off and restart it ...it is fine..weird...could it be the same. I do not have a spare key to try it..

I dont think that would have anything to do with your key. It could be that your are having a wire/connecction coming lose.

I agree. Boomin has a totally different, simpler problem. Yours is a major electrical dropout somewhere. Maybe at the battery negative junction to the block, or even a low-output alternator.

That is what I was thinking first....but I was reaching at straws once I read this subject. I am thinking it is a alternator on it way out. I can get that tested fairly easy. Thanks though Willwren.

I've had the EXACT problem.
Here'* the problem The security system needs to mimic the resistance of your key. Mine had and issure where if the temperature dropped to low the connectors that they use to connecttor that they use clipps onto the wire and can sometimes disconnect. When this happens the car will not start period. I even pulled all the connections on the unit.

Try this avenue first

i will have to consider that....it did not start once yesterday, but after the light went out it fired right up again...today it started everytime (knock on wood)...ive worked at a service station for 5 years and never seen this problem...ive tried the spare key and it doesnt always work either...so i figure its either wire or connector....but any advice helps....thanks.