Fiat Fullback Single cab Owner's Manual page 168

To shift from
2H
4H
4H
4L
Shifting of setting of the drive mode-selector between "2H" and "4H" should only be done at speeds below 100 km/h.
During driving, never attempt to shift from "4H" to "4L".
When shifting from "2H" to "4H" in cold weather while the vehicle is in motion, the transfer gear may make some noise. In cold
weather, try to shift the gear while the vehicle is stopped.
When shifting between "4H" and "4L", the transfer gear may make some noise.
When the drive mode-selector is set between "2H" and "4H" while the vehicle is stopped, the 2WD/4WD operation indicator
lamp blinks while the selection is in process. Drive slowly and normally after confirming that the lamp is illuminated. Refer to
"2WD/4WD operation indicator lamp and low-range indicator lamp".
When the drive mode-selector is set between "2H" and "4H" while the cruise control is activated, the transfer gear may make
some noise.
When the drive mode-selector is set between"4H" and "4L" in cold weather, its selection may not complete. Return the drive
mode-selector to its previous position. After the engine is warmed up, make the range selection again.
131)
166
To
Vehicles with manual transmission
The drive mode-selector can be operated while the
vehicle is either moving or stationary. When the
4H
vehicle is not in motion, shift the gearshift lever to
the "N" (Neutral) position before operating the drive
mode-selector. When the vehicle is moving, and
only while it can be steered straight ahead, release
2H
the accelerator pedal before operating the drive
mode-selector.
4L
Stop the vehicle, depress the clutch pedal to the
floor and operate the drive mode-selector. Keep
depressing the clutch pedal while 2WD/4WD
operation indicator lamp continues to blink.
4H
Procedure
Vehicles with automatic transmission
The drive mode-selector can be operated while the
vehicle is either moving or stationary. When the
vehicle is not in motion, shift the selector lever to
the "N" (NEUTRAL) position before operating the
drive mode-selector. When the vehicle is moving,
and only while it can be steered straight ahead,
shift the selector lever to the "D" (DRIVE) position,
and release the accelerator pedal before operating
the drive mode-selector.
Stop the vehicle, shift the selector lever to the "N"
(NEUTRAL) position, and operate the drive
mode-selector. If operation is made with the
selector lever placed in any other position than "N"
(NEUTRAL) position, a gear noise may be
generated, with a possible failure to shift into a
proper gear.