Reverse Signal Test
WARNING: This page is about a different car, the 2005 Lincoln Navigator and 2005 Ford Expedition. However, it is still accessible from the selected car via links, so may be relevant.
From the diagnostic function, select the REVERSE SIGNAL option by moving the enter button up or down to scroll the menu then press the enter button.
Follow the on-screen instructions to verify the reverse signal.
If the reverse signal test fails, GO to PINPOINT TEST M .