Hummer 2006 H3 - Manual (Page 85)

Swing-gate
To lock or unlock the swing-gate, use the power door
lock switch or the remote keyless entry transmitter.
{ CAUTION:
Make sure the swing-gate is completely closed.
Driving with the swing-gate open could injure
pedestrians or damage the vehicle.
To open the swing-gate, pull the door handle.
Pull the swing-gate rearward slightly and it will
automatically open.
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