If you're looking to bypass the security system on your 2003 Chevy Silverado, there are a few things you'll need to do. First, you'll need to locate the system's control module. This is usually located in the dash or under the seat. Once you've found it, you'll need to disconnect the battery and remove the ground wire from the control module. Next, use a wire tap or butt connector to connect the positive wire from the ignition switch to the positive wire on the control module. Finally, reconnect the battery and turn on the ignition switch. The security system should now be bypassed!