Visual/Physical Inspection

WARNING: This page is about a different car, the 2022 Cadillac CT4. 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 instrument panel cluster or the audible warning systems.
Inspect the accessible system components or the visible system components for obvious damage or for obvious conditions which can cause the symptom.
Inspect for the proper fluid levels.