GMC 1999 Jimmy Owner's Manual page 75

To open the entire liftgate, lift the handle located in the
center of the door.
To lock a power lock system from the outside, insert the
key into the lock button and turn clockwise. All doors
will lock. You may also use the keyless entry system or
the power door locks to lock the liftgate and liftglass.
The liftglass can be opened
using the pushbutton on the
liftgate after the driver's
door has been opened using
either the power lock
system or the remote
keyless entry system.
Remote Rear Glass Release
If your vehicle has an automatic transmission, your shift
lever must be in PARK (P) or NEUTRAL (N) for the
release to work.
If you have a manual transmission, either with or
without the keyless entry system, you must apply your
parking brake or have the ignition off before you can
open the endgate glass.
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This button on the
passenger's side of the
steering column allows you
to release the rear glass
from inside the vehicle.
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