Audio Unit
WARNING: This page is about a different car, the 2006 Ford Pickup, 2006 Ford F550 Super Duty, 2006 Ford F450 Super Duty, and 2006 Ford Cab & Chassis. However, it is still accessible from the selected car via links, so may be relevant.
The audio unit can be powered up when the key is in the ON or ACC position. The audio unit provides audio signals to the speakers to produce sound.