Depending on what was ordered on the vehicle:The liftgate can be opened by operating the switch on the instrument panel. Battery voltage is supplied to the liftgate actuator through the body control module (BCM). The BCM will pulse the liftgate actuator when a release input is received through the key fob, or the instrument panel switch.
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The switch is located in the center lower area
If the switch is not here, then the wiring may be there, depending on how it was ordered