Hummer 2007 H3 - Manual (Page 243)

Locking Rear Axle
Your vehicle may have this feature. The locking
rear axle can give your vehicle additional traction
from the rear wheels when traveling 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 to the right
of the transfer case
buttons on the center of
the instrument panel.
To lock the rear axle, do the following:
1. Place the transfer case in the 4LO Lock mode.
This is the only mode which will allow the rear
axle to lock. See Full-Time Four-Wheel Drive
on page 111 for more information regarding
the transfer case and 4LO Lock mode.
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.
Notice: If you try to lock the rear axle while
your vehicle is stuck and the tires are spinning,
you could damage your vehicle’s drivetrain.
The repairs would not be covered by your
warranty. Always lock the rear axle before
attempting situations and/or navigating terrain
which could possibly cause the vehicle to
become stuck.
The locking rear axle will be disengaged when the
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 mode.
Notice: If you lock the rear axle while driving
on pavement, you could damage your vehicle’s
drivetrain. The repairs would not be covered by
your warranty. Do not use the locking rear axle
on pavement. If you need four-wheel drive when
traveling on pavement, use only 4HI.
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