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While you are in there, make sure your push pull cable is not broken where it mounts to the latch. Check tension by manually triggering the latch release actuator and verify the micro switch under the latch is being depressed. If the cable piece where the tabs are is broken it will not have the proper tension to push the micro switch down.

Chiming in here to stop people from spinning their wheels and to actually answer a question which seems impossible in the Z community after the Z32. Fifth bow motor will not activate in the situations listed above. you can manually move the fifth bow motor after the clicking is heard. The latch is disconnected. Use a 5mm Allen head on the motor under the plastic trim. Once the fifth bow motor is lifted, you can open the trunk and release the storage compartment latches and manually open the tonneau cover. inside the tonneau cover is your problem. There is the fifth bow release actuator, the fifth bow latch, and the fifth bow auto closing actuator. your latch release IS working. That is the click after the button releases. The next step of operation is for the system to check if the auto close actuator is open or closed. Your auto close actuator motor cable may be loose or mispositioned, flicking one of the micro switches on the latch and causing the operation to stop due to unexpected positioning. pull the assembly, clean the micro switches, disassemble the auto closure actuator, rewind the motor to fully retracted, grease cable. You should be able to spin the cable into and out the motor by hand now by using the tab. Reinstall the assembly. Make sure the latch is in RELEASED position. Make sure the piece that pulls the latch down is in the UP position. Connect the greased cable to the shortest possible length while still depressing the upper micro switch. You need to enter the vehicle and close the roof at this point. It should work.