security system reset?

1999 BUICK PARK AVENUE
270,000 MILES • 3.8L • V6 • 2WD • AUTOMATIC
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RYPARKAVE
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car wont start. Replaced ignition switch. Believe its the passkey 3 system in anti theft mode. But doors are still unlocked and accessory power works sometimes but wont completely turn off unless i disconnect battery. I am 3rd owner. Have no key fob and chip is not in key but in ignition lock cylinder i guess. Need to bypass or fix so car will start. Checked fuel and starter etc. Arced starter it ran for 3 seconds then shut off. Tested battery etc. Help please.
Mar 27, 2021 at 10:21 AM
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STRAILER
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If the security light is flashing you need to reset the system. this guide can help you fix it:

https://www.2carpros.com/articles/how-to-reset-a-security-system

Please run down this guide and report back.
Mar 29, 2021 at 8:50 AM