Circuit/System Verification
WARNING: This page is about a different car, the 2007 Suzuki XL7. However, it is still accessible from the selected car via links, so may be relevant.
Ignition ON, observe the scan tool Cruise Control Switch parameter while activating the cruise control switch ON and then deactivate it. The reading should change between On and Off accordingly with the depressed switch. The cruise control LED in the steering wheel controls switch - left should also turn on and turn off accordingly with the depressed switch.