2007 Hummer H3 Owner's Manual - Page 114
2007 Hummer H3 Manual
Page 114 highlights
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 Into NEUTRAL To shift the transfer case to NEUTRAL, do the following: 1. Set the parking brake. 2. Start the vehicle by turning the ignition to START. 3. Put the transmission in NEUTRAL (N). If your 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. {CAUTION: Shifting an all-wheel-drive vehicle's transfer case into NEUTRAL can cause your vehicle to roll even if the automatic transmission is in PARK (P) 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. 114