2010 Ford Expedition EL Owner Guide 3rd Printing - Page 310

Driving 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. Audible Warnings Distance to Object Warning Speed above 2.5 mph (4 km/h) up to 1.6 ft (.5 m) Solid 1.6 ft (.5 m) to 3.1 ft (1 m) Fast beep 3.1 ft (1 m) to 5.7 ft (1.8 m) Medium/fast beep 5.7 ft (1.8 m) to 9 ft (2.8 m) Medium beep 9 ft (2.8 m) to 13 ft (4 m) Medium/slow beep 13 ft (4 m) to 19.6 ft (6 m) Slow beep Speed below 2.5 mph (4 km/h) up to 1.4 ft (.4 m) Solid 1.4 ft (.4 m) to 3 ft (.9 m) Fast beep 3 ft (.9 m) to 4.5 ft (1.4 m) Medium beep 4.5 ft (1.4 m) to 6.3 ft (1.9 m) Medium/slow beep 6.3 ft (1.9 m) to 8.7 ft (2.6 m) Slow beep 8.7 ft (2.6 m) to 16.4 ft (5 m) No sound 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. The message center will indicate the system is off and will not allow the driver to switch the system on to indicate a failure of the reverse sensing system. The radar sensor is located behind the rear bumper/fascia. Always keep the rear bumper/fascia free from snow, ice and large accumulations of dirt. These elements may cause the system to operate inaccurately. If the vehicle sustains damage to the rear bumper/fascia, leaving it misaligned or bent, the sensing zone may be altered causing inaccurate measurement of obstacles or false alarms. 310 2010 Expedition (exd) Owners Guide, 3rd Printing USA (fus)