Amp v4/mono 5V OUT

Is it possible for 5V OUT XH2 pins (no.21 in manual) on Amp v4 board to go OFF when Amp is turned Off via remote or Adc key?

Maybe UART settings?

It would be useful to trigger outer devices like amp/led/ chargers when amp is ON.
GPIO can be set to do that with 3…2V but only when music is playing or one minute longer when it stops.
And it would also help reducing power consumption in standby state if used on batteries.

Also, does anybody knows any SSR with 3V DC input (for GPIO) and DC output? I only found large one of 4A.

Sorry, the 5V output is not controlled, and will always have output when connected main power.