GMC 1993 Suburban Owner's Manual page 72

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If your vehicle has a tailgate, you must raise the rear glass before lowering
the tailgate. To open the glass from the outside, use your door key. With the
key in the lock, turn the key
to
the right to release the glass, then lift it up,
Open the tailgate by
lifting up on the handle while pulling the tailgate toward
you.
Close the tailgate before closing the rear glass.. After closing, make sure the
tailgate is securely latched by pulling
it
toward you. After closing the ..rear
glass, pull up on its handle to make sure it is locked.
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