Normal Operation
WARNING: This page is about a different car, the 2003 Lincoln Aviator. However, it is still accessible from the selected car via links, so may be relevant.
Battery voltage is supplied to the navigation system module through circuit 1001 (WH/YE). The accessory/delay relay supplies voltage to the navigation system module through circuit 1002 (BK/PK). Circuit 1205 (BK) provides the navigation system module ground.