The Digital Pin 5 is control the XBee power regulator Enable pin.
The default setting is aways enable XBee power.
If you need control the XBee power by Digital Pin 5, you need cut the thin wire between VCC and EN.
And solder a bridge between EN and CTL_D5 side.
Note the Digital pin 5 control the XBee power regulator Enable pin, the regulator can supply 150mA. it is not powered from the IO, we are sorry for the mistake and we will correct document.
Digital Pin 5 high is enable the XBee power.
And you should consider XBee power up time.
Thanks
Albert