2006 Hummer H3 Owner's Manual - Page 97

It is normal for your vehicle to have engagement noise and bump when shifting between Four-Wheel Low and Four-Wheel High ranges or from NEUTRAL with the engine running. If the Four-Wheel-Low Lock button is pressed when your vehicle is in gear and/or moving too fast, the Four-Wheel-Low Lock indicator light will flash for 15 seconds and not complete the shift unless your vehicle is moving less than 3 mph (5 km/h) and the transmission is in NEUTRAL (N). After 15 seconds the transfer case will return to the last chosen setting. Four-Wheel-Low Lock 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 Four-Wheel-High Lock button. If your vehicle has a manual transmission, the clutch pedal must be pressed to the floor while you press the Four-Wheel High or Four-Wheel-High Lock button, or the shift will not be completed. You must wait for the Four-Wheel High or Four-Wheel-High Lock indicator light to stop flashing and remain lit before shifting your transmission into gear. It is normal for your vehicle to have engagement noise and bump when shifting between Four-Wheel Low and Four-Wheel High ranges or from NEUTRAL with the engine running. If the Four-Wheel High or Four-Wheel-High Lock button is pressed when your vehicle is in gear and/or moving too fast, the Four-Wheel High or Four-Wheel-High Lock indicator light will flash for 15 seconds but will not complete the shift unless your vehicle is moving less than 3 mph (5 km/h) and the transmission is in NEUTRAL (N). Shifting Out of Four-Wheel-Low Lock Notice: Shifting the transmission into gear before the indicator light stops flashing could cause damage to the transfer case. Always wait until the indicator light stops flashing before putting the transmission back in gear. To shift out of Four-Wheel-Low Lock, your vehicle must be stopped or moving less than 3 mph (5 km/h) with the transmission in NEUTRAL (N) and the ignition in ON. The preferred method for shifting out of 2-25