In Germany I have had a crossfire who has the same issue, there it was a connection problem on a plug. The skreem sends the open/close command over a serial connection (wire) to the bcm and the bcm over CAN to the locking pump in the trunk. The wire from the skreem to the bcm are split and have a plug in the paasenders side under the metal plate where also the amplifier and the control unit for the automatic transmission is bolted on.
After disconnect and reconnect this plug all works again. We soldered than the wire together because the plug is only necessary to install the wiring harness.