Chevrolet 2000 Blazer Owner's Manual page 78

2-10
When the doors are
unlocked, press the button
to open the glass.
The endgate can be opened without a key if the driver's
door is unlocked. The endgate glass will not release if
the vehicle is in gear.
To lock a power lock system from the outside,
insert the key into the lock button and turn clockwise.
All doors will lock.
Reach inside the endgate to
lift the handle and open
the endgate.