Ford F-150 Owner's Manual page 257

The RSS automatically turns on
when the gearshift lever is placed in
R (Reverse) and the ignition is ON.
An RSS control allows the driver to
turn the RSS on and off. To turn the
RSS off, the ignition must be ON,
and the gear selector in R (Reverse).
An indicator light on the control will
illuminate when the system is turned off. If the indicator light illuminates
when the RSS is not turned off, it may indicate a failure in the RSS. The
RSS will remain off until either the RSS control is pushed again or the
ignition switch is recycled.
Keep the RSS sensors (located on the rear bumper/fascia) free
from snow, ice and large accumulations of dirt (do not clean the
sensors with sharp objects). If the sensors are covered, it will
affect the accuracy of the RSS.
If your 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.
FOUR-WHEEL DRIVE (4WD) OPERATION (IF EQUIPPED)
For important information regarding safe operation of this type
of vehicle, see Preparing to drive your vehicle in this chapter.
Four–wheel drive (4WD) supplies power to all four wheels. 4WD should
not be operated on dry pavement; driveline damage may occur.
If equipped with the Electronic Shift 4WD System, and 4WD Low
is selected while the vehicle is moving above 3 mph (5 km/h), the
4WD system will not engage past 4WD High. This is normal and
should be no reason for concern. Refer to Shifting to/from 4L (4WD
Low) for proper operation.
System indicator lights
• 4X4 HI - Momentarily illuminates
when the engine is started.
Illuminates when 4H is selected.
2007 F-150 (f12)
Owners Guide (post-2002-fmt)
USA (fus)
Driving
4x4 HI
257