Sorry but I still have problems to understand the (not quite understand) 
Can you draw me to (describe exactly) how to connect the hds and lss-1 so I can switch (button) run (enable) lss-1 when I want.
Will option B is so run (option B will be run) with a switch (switch) scan structure (LSS-1)?
As the connecting pins (wires) to the battery is to enable (start) hds (automatic and switch start (activate) scan structure (LSS-1) when I want (I want it)
Sonar HDS is to run as connecting to the battery and when I press the LSS (run) switch