How do you disable or bypass security system 1999 Chevy Tahoe with no remote?

To disable or bypass the security system on a 1999 Chevy Tahoe without a remote, you can try using the key in the driver's side door lock to unlock the door, which may disarm the system. Alternatively, you can disconnect the battery for a few minutes and then reconnect it, which may reset the system. If these methods don't work, you might need to consult a professional locksmith or a mechanic for further assistance. Always ensure you have proper ownership documentation before attempting to bypass any security features.