2004 GMC Canyon Owner's Manual - Page 107

4n(4LO): This setting also engages your front axle to give you extra traction. It sends the maximum power to all four wheels. You might choose 4LO if you were driving off-road in sand, mud or deep snow and climbing or descending steep hills. Indicator lights in the buttons show you which setting you are in. The indicator lights will come on briefly when you turn on the ignition and one will stay on. If the lights do not come on, you should take your vehicle in for service. An indicator light will flash while shifting. It will remain illuminated when the shift is completed. If for some reason the transfer case cannot make a requested shift, it will return to the last chosen setting. Shifting from 2HI or 4HI to 4LO To shift from 2HI or 4HI to 4LO, the vehicle must be stopped or moving less than 1.2 mph (2 km/h) with the transmission in NEUTRAL (N) in vehicles equipped with an automatic transmission or the clutch pedal engaged in vehicles equipped with a manual transmission. The preferred method for shifting into 4LO is to have your vehicle moving 1.2 mph (2 km/h). Press and release the 4LO button. You must wait for the 4LO indicator light to stop flashing and remain illuminated before shifting your transmission into gear or releasing the clutch pedal. If the 4LO button is pressed when your vehicle is in gear and/or moving, the 4LO indicator light will flash for 30 seconds and not complete the shift. On automatic transmission equipped vehicles, if your transfer case does not shift into 4LO, your transmission indicator switch may require adjustment. With your transmission in NEUTRAL (N), press and release the 4LO button. While the 4LO indicator light is flashing, shift your transmission into PARK (P). Press 4LO again. Wait until the 4LO indicator light remains illuminated before shifting your transmission into gear. Press the 4LO button again to complete the shift. This will get you into 4LO, but you should take your vehicle in for service to restore normal operation. Shifting from 2HI to 4HI Press and release the 4HI button. This can be done at any speed, and the front axle will lock automatically. Shifting from 4HI to 2HI Press and release the 2HI button. This can be done at any speed, and the front axle will unlock automatically. 2-27