Chevrolet 1994 Blazer Owner's Manual page 86

An indicator light near
the lever shows you
the transfer case
settings:
2 WHEEL
4HIGH
0
N SET PARKING BRAKE
0
4LOW
The front axle portion of the diagram on the indicator will light up when
you shift into four-wheel drive. A slight delay between shifting and the
pattern's lighting is normal. If the pattern does not light up, or if the front
axle does not go out after you shift out of four-wheel drive, have your
dealer check your system. Turn the LIGHTS switch located above your
headlight switch to the left to dim your transfer case indicator light when
your headlights or parking lights are on.
2 WHEEL: This setting is for driving in most street and highway situations.
Your front axle is not engaged in two-wheel drive.
4 HIGH: This setting engages your front axle to help drive your vehicle.
Use
4 HIGH when you need extra traction, such as on snowy or icy roads,
or in most off-road situations.
N SET PARKING BRAKE: Shift to this neutral setting only when your
vehicle needs to be towed.
4 LOW This setting also engages your front axle to give you extra traction.
You may never need 4 LOW. It sends the maximum power to all four
wheels. You might choose 4 LOW if you were driving off-road in sand,
mud, or deep snow and climbing or descending steep hills.
You can shift from 2 WHEEL to 4 HIGH or from 4 HIGH to 2 WHEEL
while the vehicle is moving. It is not necessary for you to press the transfer
case shift lever button. Your front axle will engage faster if you take your
foot off of the accelerator for a few seconds after you shift.
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