Circuit/System Description
WARNING: This page is about a different car, the 2017 GMC Acadia. However, it is still accessible from the selected car via links, so may be relevant.
The steering wheel controls are divided into a right-hand set and left-hand set. The right-hand switch communicates with the instrument cluster through serial data and provides input from the rear left-hand switch and rear right-hand switch. The instrument cluster identifies the switch selection and activates the feature.