Security Light

The first thing your going to have to do is get your body control module scanned for code's. You cant bypass the security system. Let me know what code's you get. check out this guide and video.

https://youtu.be/InIlnsjOVFA

and

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

Please run down this guide and report back.

It doesn't have to be a saturn dealer to read your body control module code's. All you have to do is call around to all the car repair shop's and ask them if they have a scanner that can read body control module code's and tell them what kind of car you have. If they do then have them see what code's you have in all your car's computer's.

So does anything stop working ever like the fuel gauge temp gauge dome light power door locks keyless entry if you have those?Also I dont see what disconnecting the battery has to do with anything. To reset the security light you would crank the car to start it leave the key in the run position till the security light turns off. Then turn the key off for 30 seconds then do the same thing two more times. Thats how you relearn thr pass lock on that car. But when you have you have problems with the security system sometimes it only takes one or two learn cycles to get it to start. You are going to have to take it to a repair shop that can read body control module codes those are codes that start with the letter B followed by a 4 digit number that is your starting point. Most of the codes you will get to diagnose the code yourself you will need a multimeter and scan tool that can read body control module codes and live data from the body control module. Most the time the problem you decribe your having is caused by a bad body control modle or a bad pass lock sensor.

The body control module is slid into a channel on top of you glove box you cant change it yourself it has to be programed with mileage options calibration file etc. If everything else works like its supposed to then most likely ita a bad pass lock sensor not the body control module. But without checking for codes and doing some testing that would just be a guess.

The pass lock sensor is the sensor that makes it so you need the ignition cylinder to turn to start the car not just a pair of pliers without the ignition cylinder. The sensor is part of the ignition housing so to replace the sensor you would have to replace the ignition housing. The codes would lead them to a trouble tree to follow to see why the car doesnt start and the security light stays on. The code wont say just replace the pass lock sensor.I was just saying from many expernices with this car I think most likely you have a bad pass lock sensor.