2003 Hummer H2 Owner's Manual - Page 123
2003 Hummer H2 Manual
Page 123 highlights
Locking Rear Axle The locking rear axle can give you additional traction from the rear wheels when you are driving in off-road situations such as mud, snow, sand, steep hills and uneven terrain. The button used to turn this feature on or off is located above the transfer case buttons to the right of the steering wheel. To lock the rear axle do the following: NOTICE: Do not try to lock the rear axle if the vehicle is stuck and the tires are spinning. You can damage drivetrain components and this damage would not be covered by your vehicle's warranty. Lock the rear axle before attempting situations or navigating terrain which could possibly cause the vehicle to become stuck. The locking rear axle will be disabled when the vehicle's wheel speed is greater than 20 mph (32 km/h), if the vehicle's battery is low and/or the transfer case is shifted out of 4LO Lock. 1. Place the transfer case in the 4LO Lock mode. This is the only mode which will allow you to lock the rear axle. See "All-Wheel Drive" in the Index for more information regarding the transfer case. 2. Press the button with the vehicle stopped or moving less than 2 mph (3 km/h). You must wait for the light in the button to stop flashing and remain illuminated before the rear axle is locked. Driving forward a few feet at less than 2 mph (3 km/h) may also help to engage the rear axle. NOTICE: Do not use the locking rear axle on pavement. You can damage drivetrain components and this damage would not be covered by your vehicle's warranty. Use only 4HI when traveling on dry pavement. 2-41
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