Possible Causes

WARNING: This page is about a different car, the 2003 Lincoln LS. However, it is still accessible from the selected car via links, so may be relevant.

circuit 10-GK24 (GY/RD) open or shorted
circuit 10-GK25 (GY/OG) open or shorted
circuit 10-GK26 (GY/VT) open or shorted
circuit 8-GK35 (WH) open or shorted
circuit 9-GK35 (BN) open or shorted
navigation system module
audio unit

Fig 1: Pinpoint Test F: Navigation System Does Not Operate Correctly - Display Screen Is Inoperative (Step F1-F2)

Courtesy of FORD MOTOR CO.

Fig 2: Pinpoint Test F: Navigation System Does Not Operate Correctly - Display Screen Is Inoperative (Step F4-F6)

Courtesy of FORD MOTOR CO.