Sensing system
Traffic control systems, inclement weather, air brakes, and external motors and fans may also affect the function of the sensing system; this may include reduced performance or a false activation.
The sensing system warns the driver of obstacles within a certain range of the bumper area. The system turns on automatically whenever the ignition is switched on.
When receiving a detection warning, the radio volume is reduced to a predetermined level. After the warning goes away, the radio volume returns to the previous level.
The system can be turned off using the information display control. See the Information Display chapter. If a fault is present in the system, a warning message appears in the information display and does not allow the driver to switch the faulted system on.
Using the Rear Sensing System
The rear sensors are only active when the transmission is in R. As the vehicle moves closer to the obstacle, the rate of the audible warning increases. When the obstacle is fewer than 12 inches (30 centimeters) away, the warning sounds continuously. If a stationary or receding object is detected farther than 12 inches (30 centimeters) from the side of the vehicle, the tone sounds for only three seconds. Once the system detects an object approaching, the warning sounds again.

A. Coverage area of up to 6 feet (2 meters) from the rear bumper (with a decreased coverage area at the outer corners of the bumper).
The system detects certain objects while the transmission is in R:
• and moving toward a stationary object at a speed of 5 km/h or less.
• but not moving, and a moving object is approaching the rear of the vehicle at a speed of 5 km/h or less.
Test yourself
A quick Ford Mustang quiz: every answer comes with an explanation and a link to the manual page.