Charge Signal
WARNING: This page is about a different car, the 2005 Acura TSX and 2004 Acura TSX. However, it is still accessible from the selected car via links, so may be relevant.
The ECM/PCM sends a charge signal to the navigation unit via F-CAN. A thermister inside the navigation unit monitors the units internal temperature. This information combined with charge signal determines the control units internal cooling fan operation.