MC60, stand-alone mode, no data on GNSS uart after connect power on?

Hi, I use MC60 in stand-alone mode, when I connect power supply 3,3V to VCC GNSS, there isn’t any data on GNSS TX output. There is information in datasheet that after power on GNSS part, this part will enter into full on mode automatically. Power supply is stable, TX has high state all the time. No any data.

Thanks for any help.
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