Chevrolet 1994 Blazer Owner's Manual page 88

3. 4 LO: This setting also engages your front axle to give you extra
traction. You may never need 4 LO. It sends the maximum power to all
four wheels. You might choose 4 LO if you were driving off-road in
sand, mud, deep snow and climbing or descending steep hills.
Indicator lights in the switch show you which setting you are in. Both
indicator lights will come on briefly when you turn on the ignition. If both
lights do not come
on, you should take your vehicle in for service. The 4 HI
position has a green indicator light and the 4 LO position has an amber
indicator light. When shifting, an indicator light will flash until the shift is
completed then remain solidly lit.
Two-wheel drive, (2 WHEEL), does not have a switch position or an
indicator light. Your vehicle will be in two wheel drive if neither indicator
light is on.
To shift from two-wheel drive, (2 WHEEL) to 4 HI:
Press and release the
4 HI
switch. This can be done at any speed, and the front axle will lock
automatically.
To shift from 4 HI to two-wheel drive (2 WHEEL): Press and release the
4 HI
switch. This can be done at any speed, and the front axle will unlock
automatically.
To shift from two-wheel drive (2 WHEEL) to 4 LO: The vehicle must be
stopped or moving less than 3 mph (4.8 km/h) with the transmission in
" N '
(Neutral) or the clutch pedal depressed. The preferred method for shifting
into 4 LO is to have your vehicle slowly moving one-to-two mph (1.6 to
3.2 k d h ) . Press and release the 4 LO switch. You must wait for the amber
4 LO indicator light to stop flashing and go solid amber before shifting your
transmission into gear or releasing the clutch pedal.
If the 4 LO switch is pressed when your vehicle is in gear and/or moving,
the amber 4 LO indicator light will flash for 30 seconds and not complete
the shift unless your vehicle is below 3 mph (4.8 k d h ) and the transmission
is in "N" (Neutral) or the clutch pedal depressed.
On automatic transmission equipped vehicles: If your transfer case does not
shift into 4 LO, your transmission indicator switch may require adjustment.
With your transmission in "N" (Neutral), press and release the 4 LO
switch. While the amber 4 LO indicator light is flashing, shift your
transmission into P (Park).
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