hey all i just did a search on this and i heard that the car may not start and the wires in the colum caMe undone, what are other reasons for it to come on? why is it there? and how does it protect the car? i have a 95 z28 and it satrts fine and everything what can it be and how could it have turned on?
thanks!

 

The ignition key has a resistor chip enbedded into it. The security module reads the resistance of the chip when the key is inserted in the ignition switch. If the resistance is according to what is programmed into the security module, it will send a data stream to the PCM indicating hat the right key is being used. Upon receiving the OK message, the PCM will allow the engine to start. Problems: bad contacts in the ignition switch preventing the resistance to be read, defective key contacts, resitor went bad, wiring problems ignition key to security module, wiring problem security module to PCM, bad security module.