Ford 2010 Expedition Owner's Manual page 783

While receiving a warning the radio volume will be reduced to a
predetermined level. After the warning goes away, the radio will return
to the previous value.
Distance to Object
Speed above 2.5 mph (4 km/h)
up to 1.6 feet (.5 meters)
1.6 feet (.5 meters) to 3.1 feet
(1 meter)
3.1 feet (1 meter) to 5.7 feet
(1.8 meters)
5.7 feet (1.8 meters) to 9 feet
(2.8 meters)
9 feet (2.8 meters) to 13 feet
(4 meters)
13 feet (4 meters) to 19.6 feet
(6 meters)
Speed below 2.5 mph (4 km/h)
up to 1.4 feet (.4 meters)
1.4 feet (.4 meters) to 3 feet
(.9 meters)
3 feet (.9 meters) to 4.5 feet
(1.4 meters)
4.5 feet (1.4 meters) to
6.3 feet (1.9 meters)
6.3 feet (1.9 meters) to
8.7 feet (2.6 meters)
8.7 feet (2.6 meters) to
16.4 feet (5 meters)
The reverse sensing system is automatically enabled when the gearshift
lever is placed in R (Reverse) and the ignition is on. A control in the
message center allows the driver to disable the system, refer to Message
center in the Instrument Cluster chapter for more information.
Note: If the system cannot be turned off, refer to MyKey in the Locks
and Security chapter for more information.
2010 Expedition (exd)
Owners Guide (own2002), 1st Printing
USA (fus)
Audible Warnings
Warning
Solid
Fast beep
Medium/fast beep
Medium beep
Medium/slow beep
Slow beep
Solid
Fast beep
Medium beep
Medium/slow beep
Slow beep
No sound
Driving
309