Trunk Lock Actuator Does Not Work

  mercedes/gl-class/2007-2012

My trunk lock on my 2007 Mercedes GL450 will not open using the key fob, the exterior switch near license plate, or the switch inside the vehicle.  It will only release manually from inside the vehicle.  I replaced the trunk lock actuator, but still have the same issue.  Is there a fuse and/or relay I should change?  Or could there be another issue?

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