GMC 1999 Jimmy Owner's Manual page 93

On automatic transmission equipped vehicles, if your
transfer case does not shift into 4HI, your transmission
indicator switch may require adjustment. With your
transmission in NEUTRAL (N), press and release the
4HI switch. While the 4HI indicator light is flashing,
shift your transmission into PARK (P). Wait until the
4HI indicator light remains illuminated before shifting
your transmission into gear. This will get you into 4HI,
but you should take your vehicle in for service to restore
normal operation.
Automatic Transfer Case (If Equipped)
The transfer case switches
are to the right of the
steering wheel on the
instrument panel. Use these
switches to shift into and
-
out of four wheel drive.
You can choose among four
driving settings:
2HI: This setting is used for driving in most street
and highway situations. Your front axle is not engaged
-
in two wheel drive. This setting also provides the best
fuel economy.
AUTO 4WD: This setting is ideal for use when road
conditions are variable. When driving your vehicle in
AUTO 4WD, the front axle is engaged, but the vehicle's
power is sent only to the rear wheels. When the vehicle
senses a loss of traction, the system will automatically
-
engage four wheel drive. Driving in this mode results in
slightly lower fuel economy than 2HI.
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