Cadillac 2014 ATS Owner's Manual page 312

If the vehicle is equipped with
All-Wheel-Drive (AWD), this is an
additional system that needs
lubrication.
It is not necessary to regularly
check the transfer case fluid unless
a leak is suspected or an unusual
noise is heard. A fluid loss could
indicate a problem. Have it
inspected and repaired.
1. Fill Plug
2. Drain Plug
To get an accurate reading, the
vehicle should be on a level
surface.
If the level is below the bottom of
the fill plug hole, on the transfer
case, some lubricant will need to be
added. Add enough lubricant to
raise the level to the bottom of the
fill plug hole. Use care not to
overtighten the fill plug.
Refer to the Maintenance Schedule
to determine what kind of lubricant
to use. See
When you are doing this
inspection, the vehicle could
move suddenly. If the vehicle
moves, you or others could be
injured.
.