Circuit/System Description
WARNING: This page is about a different car, the 2008 Cadillac CTS. However, it is still accessible from the selected car via links, so may be relevant.
When the navigation radio is on, a discrete 12-volt signal is supplied on the remote enable circuit to the Color Display Module and Color Display Actuator. This signal is used to control the power state of the module, which is now in the active state.