Circuit/System Description
WARNING: This page is about a different car, the 2008 Pontiac G8. However, it is still accessible from the selected car via links, so may be relevant.
The infotainment unit is fully illuminated. The infotainment unit receives the illumination control signal from the hardwired illumination input on the connector. The actual dimming value is received from the BCM via GMLAN. The infotainment unit illumination test is performed using a scan tool, and controls the fascia illumination directly to verify correct operation.