The security system used on this car is the same as its been the past 15 years. ( I have seen firebirds with chip in the key as early as 1987.) The chip is a resistor. The engine computer must see the same resistance from this chip as it expects. First try cleaning the key with alcohol or some other solvent. Then try cleaning the ignition switch by inserting the key into the keyhole repeatedly. This should solve your problem, if not...... Then measure the key's resistance with an ohm meter and remember that value. When you get a new key made for the car, you will have to tell them this resistance value so that they can match up the closest one. (if you loose the key, it will be harder because the car locks itself out for a certain amount of time each time a wrong key is used) The mechanic will have to try one key per half hour until he finds the right one.) As a last resort you can buy a resistor from radio shack with the closest number to your ohm meter measurement, disconnect the wire going to the security in the stearing column, and insert this resistor into that connector.
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That's because water is soaking the BCM. Where the security is programmed. First fix the water problem. You will have to remove the wiper arms, remove the wiper bezel. On the passenger side there will be a piece of molding that as fell off. down by the cabin filter (replace it also). use silicone and replace the molding back to the ledge right above the filter. This will fix the water problem. Next fix the BCM. It is under the dash directly below where you were just working. Remove the three plugs, dry them out(hair dryer?) Pull the BCM out (Black box, just pops out to the side). Cut the tape and open it up, remove the board. Dry it also. Also if you see ANY white to light green discoloration on the board. Brush it of with a tooth brush, Be very nice to this board. $300+ to replace it and have it programmed. Doing this will get rid of all the security problems and lights. I've done it to many times.
This could be an anti theft security issue. This happens all the time in GM's. The anti thefts are known to fail and cause the car to not start, stall while driving, or start for 1-5 seconds and then die. A good indication that the security is failing is if you see a light on the dash that says SECURITY or a picture of a car with a padlock thru the window. This link explains the problem, symptoms, and some DO IT YOURSELF solutions. http://vatspasslockpasskeysecurityhelp.yolasite.com/
Make sure the DIMMER Switch on the left of the dashboard was not turned OFF inadvertently, it happens a lot while wiping the board clean, if OK, check the INST. LIGHTS 10A fuse located on the passenger side under dashboard.
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the boards in the tail lights have issues the plugs melt and they screw up the grounds. if your dash light signal indicators or on steady at night then chances are you will need new harnesses and light board assemblies