Audio Unit (THXII with Navigation)
WARNING: This page is about a different car, the 2006 Mercury Milan, 2006 Lincoln Zephyr, and 2006 Ford Fusion. However, it is still accessible from the selected car via links, so may be relevant.
The audio unit (THXII with navigation, if equipped), uses the medium speed CAN for communication with the diagnostic tool and other modules on the medium speed CAN.
Check the medium speed CAN circuits between the audio unit C240c and the DLC C251. The total resistance values must not be more than 5 ohms. If the resistance is more than 5 ohms, there is an open circuit in the medium speed CAN, damage to the DLC C251, or damage to audio unit C240c.
For additional audio unit information, refer to ENTERTAINMENT SYSTEM - GENERAL INFORMATION .
For additional navigation system information, refer to ENTERTAINMENT SYSTEM - GENERAL INFORMATION .