help.. :( security light Cheyenne 1500 98 S.O.S

GMC C1500
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EUQARA
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Computer problem
1985 GMC C1500 V8 Two Wheel Drive Automatic

Greetings, I searched through every website in Spanish and I have not achieved with a precise answer, my problem is that the change the ignition cylinder from the pik-up model Cheyenne 98 years,it flashes a light on the dashboard "Security" and turns off the car, grateful for any support, thanks
Aug 21, 2010 at 12:44 PM
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JACOBANDNICKOLAS
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If the security light is on, the anti theft system is engaged and will not allow the engine to start. I hate to say it, but the only place with the proper test equipment to check it is a dealer.
Sep 16, 2010 at 7:16 AM