FORD 2013 Expedition v.1 - Manual (Page 216)

USING FOUR-WHEEL DRIVE (4WD) (IF EQUIPPED )
WARNING: For important information regarding safe operation
of this type of vehicle, see General Information in the Wheels
and Tires chapter.
Note: Do not use 4X4 mode on dry, hard surfaced roads. Doing so will
produce excessive noise, increase tire wear and may damage drive
components. 4X4 mode is only intended for consistently slippery or loose
surfaces.
Note: If 4X4 low is selected while the vehicle is moving above 3 mph
(5 km/h), the 4WD system will not perform a shift. This is normal and
should be no reason for concern. Refer to Shifting to/from 4L (4X4
Low) for proper operation.
4WD Indicator Lights
The indicator lights illuminate in the message center in the
reconfigurable telltale (RTT) location under the following conditions.
Refer to Warning Lamps and Indicators in the Instrument Cluster
chapter.
Note: When a 4X4 system fault is present, the system will typically
remain in whichever 4X4 mode was selected prior to the fault condition
occurring. It will not default to 4X2 in all circumstances. When this
warning is displayed, have your vehicle serviced by an authorized dealer.
4X2 - Momentarily illuminates when 2H is selected.
4X4 AUTO - Continuously illuminates when 4A is selected
4X4 - Continuously illuminates when 4H is selected.
4X4 LOW - Continuously illuminates when 4L is selected.
CHECK 4X4 - Displays when a 4X4 fault is present.
216 Four-Wheel Drive (If Equipped)
2013 Expedition (exd)
Owners Guide gf, 1st Printing
USA (fus)