GMC 1999 Jimmy Owner's Manual page 73

Endgate/Liftgate
CAUTION:
It can be dangerous to drive with the rear
window, endgate or liftgate open because carbon
monoxide (CO) gas can come into your vehicle.
You can't see or smell CO. It can cause
unconsciousness and even death.
If you must drive with the rear window, endgate
or liftgate open or if electrical wiring or other
cable connections must pass through the seal
between the body and the rear window, endgate
or liftgate:
D
Make sure all other windows are shut.
D
Turn the fan on your heating or cooling
system to its highest speed with the setting on
VENT or OUTSIDE AIR. That will force
outside air into your vehicle. See "Comfort
Controls" in the Index.
D
If you have air outlets on or under the
instrument panel, open them all the way.
See "Engine Exhaust" in the Index.
Endgate Release
To open a mechanical lock system from the outside,
insert the key into the lock and turn it counterclockwise
to unlock the glass.
To open a power lock system from the outside, insert the
key into the lock button and turn counterclockwise. All
doors will unlock.
If your vehicle is equipped with the remote keyless
entry system, your vehicle does not have a lock on
the endgate. It is equipped with a pushbutton to release
the glass.
You may also use the keyless entry system, or the power
door locks, if your vehicle is so equipped.
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