FORD 2015 F-550 v.1 - Manual (Page 174)

• At speeds above 20 mph (32 km/h):
When the Hill Descent Control switch
is pressed, the Hill Descent Control
system will be enabled, the telltale in
the cluster will not be illuminated and
a message will be displayed in the
information display.
Refer to the Information Displays for
additional Hill Descent Control messages.
See Information Messages (page 92).
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Super Duty (), enUSA
Terrain Response
(If Equipped)