Unfortunately GM anti-theft systems are real effective at keeping owners out of their vehicles. I only know a few of the common problems like broken wires in the tilt steering column, but there is a relearn procedure that involves leaving the ignition switch on for multiple ten-minute intervals. KHLow2008 might be able to describe it better. You can also try disarming it by unlocking the passenger door with the key or by using a remote key fob. If either of those work, you might suspect a broken wire between the driver's door hinges going to the switch on the lock cylinder.
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Saturday, October 6th, 2012 AT 8:01 PM