GMC 2006 Canyon Owner's Manual page 112

Shifting from Two-Wheel High to
Four-Wheel High
Press and release the Four-Wheel High button.
This can be done at any speed, and the front axle
will lock automatically.
Shifting from Four-Wheel High to
Two-Wheel High
Press and release the Two-Wheel High button. This can
be done at any speed, and the front axle will unlock
automatically.
It is normal to hear and feel your vehicle's transfer case
shift into Four-Wheel High. If you shift with the vehicle
stopped, the indicator light may still flash slowly. It may be
necessary to shift the transmission momentarily into
REVERSE (R) and DRIVE (D), for an automatic
transmission, or REVERSE (R) and FIRST (1) for a
manual transmission to have the light stop flashing.
Shifting from Two-Wheel High or
Four-Wheel High to Four-Wheel Low
To shift from Two-Wheel High or Four-Wheel High to
Four-Wheel Low, the vehicle must be stopped or moving
less than 3 mph (5 km/h) with the transmission in
NEUTRAL (N) for an automatic transmission or the
clutch pedal engaged for a manual transmission.
The preferred method for shifting into Four-Wheel Low
is to have your vehicle moving 1 to 2 mph
(1.6 to 3.2 km/h).
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Press and release the Four-Wheel Low button.
You must wait for the Four-Wheel Low indicator light
to stop flashing and stay on before shifting the
transmission into gear or releasing the clutch pedal.
If the Four-Wheel Low button is pressed when your
vehicle is in gear and/or moving faster than 3 mph
(5 km/h), the four-wheel low indicator light will flash for
30 seconds and not complete the shift.
Shifting from Four-Wheel Low to
Two-Wheel High or Four-Wheel High
To shift from Four-Wheel Low to Two-Wheel High or
Four-Wheel High, your vehicle must be stopped
or moving less than 3 mph (5 km/h) with the
transmission in NEUTRAL (N) for an automatic
transmission or the clutch pedal engaged for a manual
transmission. The preferred method for shifting out
of four-wheel low is to have your vehicle moving
1 to 2 mph (1.6 to 3.2 km/h).
Press and release the Four-Wheel High or Two-Wheel
High button. You must wait for the Four-Wheel High
or Two-Wheel High indicator light to stop flashing and
stay on before shifting the transmission into gear or
releasing the clutch pedal.
If the Four-Wheel High or Two-Wheel High button is
pressed when your vehicle is in gear and/or moving
faster than 3 mph (5km/h), the Four-Wheel High or
Two Wheel High indicator light will flash for 30 seconds
but not complete the shift.