2009 GMC Canyon Extended Cab Owner's Manual - Page 111

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. 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 the 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 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 the 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 R (Reverse) and D (Drive), for an automatic transmission, or R (Reverse) and 1 (First) for a manual transmission to have the light stop flashing. 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, the vehicle must be stopped or moving less than 3 mph (5 km/h) with the transmission in N (Neutral) for an automatic transmission or the clutch pedal pressed 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 the 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. 2-29 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 N (Neutral) for an automatic transmission or the clutch pedal pressed 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).