Button operation is covered in the manual. There's a nice functional reference table in the manual that I couldn't copy. You can download the 2007 manual (not the 2008 yet) from the ford fleet site.
AdvanceTrac_ with RSC button and icon functionality
The AdvanceTrac_ with RSC system automatically turns on each time
the engine is started, even if it was turned off when the engine was last
shut down. All functions of the AdvanceTrac_ with RSC (RSC, ESC,
Engine Traction Control, and Brake Traction Control) will be activated at
start up. When the system is left active, the “sliding car” icon in the
reconfigurable telltale (RTT) location in the message center will flash
only when any of the components of the system are affecting the
vehicle’s performance, otherwise the light will remain off. Consequently,
the “sliding car” icon will not be illuminated during most of your normal
The AdvanceTrac_ with RSC button,
located on the center stack of the
instrument panel, allows the driver
to control certain features of the
AdvanceTrac_ with RSC system
below 25 mph (40 km/h). If the
vehicle is below 25 mph (40 km/h), momentarily pressing the
AdvanceTrac_ with RSC button will disable RSC, ESC and Engine
Traction Control and steadily illuminate the “sliding car” icon. Pressing
and holding the AdvanceTrac_ with RSC button for more than five
seconds will further disable the brake portion of the Traction Control
feature and the “sliding car” icon will flash momentarily and then
If the vehicle is above 25 mph (40 km/h), momentarily pressing the
AdvanceTrac_ with RSC button will steadily illuminate the “sliding car”
icon, however, the AdvanceTrac_ with RSC system will remain enabled
until the vehicle speed drops below 25 mph. If the vehicle speed
decreases below 25 mph (40 km/h), the system will become deactivated,
but if the vehicle speed subsequently increases to above 25 mph (40 km/h),
the system will again become active. In general, the system will be active
at all times the vehicle speed is above 25 mph (40 km/h).
When in R (Reverse) or in 4L (4x4 Low), ABS and the Traction Control
feature will continue to function, however ESC and RSC are disabled.
All these conditions are normal during AdvanceTrac_ with RSC
operation. Refer to the following table.
Look @ page 262 of the 3rd printing.