Locking Rear Axle - Hummer 2007 H2 Owner's Manual

Locking Rear Axle

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.
To lock the rear axle, do the following:
1. Place the transfer case in the Four-Wheel-Low
Lock mode. This is the only mode which will
allow the rear axle to lock. See Full-Time
Four-Wheel Drive on page 128 for more
information regarding the transfer case and
Four-Wheel-Low-Lock mode.
2. Press the button with the vehicle stopped or
moving less than 2 mph (3 km/h).
The button used to turn
this feature on or off is
located above the
transfer case buttons
to the right of the
steering wheel.
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
vehicle's 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 Four-Wheel-Low-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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