Delco thieflock

I have 1996 Cavalier bought 2nd hand,never used or had code for thief lock Changed battery and thief lock activated and now cannot start car Any suggestions?

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You may wanna try this: > "Set the ignition key switch to accessory--the electronics are ON in the car; then remove the negative terminal from the car battery for a few minutes. Then, turn the key to OFF and hook up the battery." < Above quote and source at >> http://www.automotivehelper.com/topic508922.htm <<. Hope it helps. sdlomi2
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Too late to help this person, but there is a way to prevent this from happening. Same with radio codes. Battery shops plug a 12 volt source into the lighter socket while swapping out the battery. Prevents codes from being lost.
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GM doesn't have anything on that car that would prevent it from starting just because you swapped the battery.
Does it have an aftermarket alarm/anti-theft system?
Do you get a flashing "security" light when you attempt to start it?
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