Visual/Physical Inspection

WARNING: This page is about a different car, the 2006 Buick LaCrosse and 2006 Buick Allure. However, it is still accessible from the selected car via links, so may be relevant.

Inspect for aftermarket devices which can affect the operation of the cruise control system. Refer to Checking Aftermarket Accessories in Wiring Systems.
Inspect the accessible system components or the visible system components for obvious damage or for obvious conditions which can cause the symptom.