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GMC 1998 Sonoma Owner's Manual page 93

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Electronic Transfer Case (If Equipped)
If your four-wheel-drive
vehicle has the electronic
transfer case, the transfer
case switches are above the
audio system controls.
Use these switches to shift into and out of four-wheel
drive. You can choose among three driving settings:
2HI:
This setting is for driving in most street and
highway situations. Your front axle is not engaged in
two-wheel drive. When this lamp is lit, it is about
one-half as bright as the others.
4HI: This setting engages your front axle to help
drive your vehicle. Use 4HI when you need extra
traction, such as on snowy or icy roads, or in most
off-road situations.
4LO:
This setting also engages your front axle to give
you extra traction. You may never need 4LO. It sends
the maximum power to all four wheels. You might
choose 4LO if you were driving off-road in sand, mud,
deep snow and climbing or descending steep hills.
Indicator lights in the switches show you which
setting you are in. The indicator lights will come on
briefly when you turn on the ignition and one will
stay on. If the lights do not come on, you should take
your vehicle in for service. An indicator light will flash
while shifting. It will remain illuminated when the
shift is completed.
Shifting from 2HI to 4HI
Press and release the 4HI switch. This can be done at
any speed, and the front axle will lock automatically.
Shifting from 4HI to 2HI
Press and release the 2HI switch. This can be done at
any speed, and the front axle will unlock automatically.
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