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That sounds an awful lot like the ECM is having trouble. Since the model year is nearly 7 years old, it is possible that the ECM is toast or that a wire or two has a corroded connection. Have a look at this information: http://engine-codes.com/u0100_saturn.html
on most late model cars , the key has chip in them that signals the ignition switch that is ok to start, with out the programed key several things are not recognized and it will not start.
what hve you checked a fuse or relay my have blown what happens when you turn the key does any lights come on in the dash check wires to ignition for bad connection or broken wires and make sure you have the right part
The security light is a visual indication that something in the car's antitheft system is failing. In most GM cars and trucks there is a hidden system that most people are unaware even exists. From the moment you put your key in the ignition, there begins a constant line of communication between your key's security chip or transponder, to the ignition's lock cylinder, and then to the car's TDM. These 3 parts are in CONSTANT communication. If the key is in the ignition, these parts are sending signals to each other. The security light illuminates when that signal gets broken, even just for a second. When the signal breaks, the car goes into antitheft mode. The car thinks its being stolen or hotwired because it is not getting that signal from YOUR specific key. There is where the security light turns on and shuts down your vehicle. http://vatspasslockpasskeysecurityhelp.yolasite.co
it is very easy-for starters there is no distributor,it has an ignition module which is located on the right side off the engine in front-just follow the spark plug wires.the plugs are very easy to get to. on an sl1 the plugs are right below the valve cover-just remove the plug wires and replace the plugs and probably wire also-unless the coils are bad(corroded)you shouldnt have to replace the ignition module.
the problem is not the bcm. the passlock security sensor is in the cylinder and housing, if the cyl and or housing was replaced the system must be relearned. if you replace the bcm you still need to relearn the system or it still will not start.
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