Shutdown (Power off) with Android?

Thank you!

Do you mean that I need to connect 16PIN to GND PIN on header?

Power button works (16PIN to GND PIN), but if I shutdown Pi4, the power button cannot startup board. We need power button for wakeup board from deepsleep. I mean Pi4 needs to disable usb ports, disable LED flash and go to the ultra low power mode. But board does not enter to deepsleep, usb is disable, Led flash is disable too, but current still about 260mA on 5V. Then I cannot wakeup the board…
How to activate deepsleep mode with ultra low power mode? And how to wakeup board via power button?
It is very important for car usage. The Pi4 cannot be used for a car without this functionality…

What is the power button pad? Pre purchase questions Rock PI4C - #2 by jack