2010 Hummer H3T Owner's Manual - Page 232

9-48 Driving and Operating If the 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 the transmission into gear. It is normal for the vehicle to have engagement noise and bump when shifting between Four-Wheel Low and Four-Wheel High ranges or from Neutral. If the Four-Wheel High or Four-Wheel-High Lock button is pressed when the 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. Shifting Into Neutral To shift the transfer case to Neutral: 1. Set the parking brake. 2. Start the vehicle. 3. Put the transmission in N (Neutral). If the vehicle has a manual transmission, press and hold the clutch pedal down while you perform Steps 5 through 9. 4. Shift the transfer case to Four-Wheel High. If the Four-Wheel-Low Lock button is pressed when the 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. 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, the vehicle must be stopped or moving less than 5 km/h (3 mph) with the transmission in N (Neutral) and the ignition in ON/RUN. The preferred method for shifting out of Four-Wheel-Low Lock is to have the vehicle moving 1.6 to 3.2 km/h (1 to 2 mph). Press and release the Four-Wheel High or Four-Wheel-High Lock button. { WARNING Shifting an all-wheel-drive vehicle's transfer case into Neutral can cause the vehicle to roll even if the automatic transmission is in P (Park) or the manual transmission is in any gear. You or others could be injured. Make sure the parking brake is firmly set before you shift the transfer case to Neutral.