Circuit/System Verification
WARNING: This page is about a different car, the 2006 Chevrolet Monte Carlo and 2006 Chevrolet Impala. However, it is still accessible from the selected car via links, so may be relevant.
Ignition ON, command the RAP relay ON and OFF with a scan tool. The RAP relay should click with each command.
If the relay clicks with each command, the control circuit is OK.