Vilas,
You said AP( autopilot ) ON or OFF doesnot make any diference on ILS below 700 AGL. That is quite obvious. I guess you meant APP (aproach button on MCP) didnīt you?
So, to sumarize below 700 AGL even with AP OFF, FD off, APP off, LSs off the ILS freq will be frozen and the ONLY way to erase ILS is to activate the SEC-FPLN for visual apch to the adjacent RWY.
Thanks for your sharing.