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uhhh, dont exctaly know what your talking about...but i might have some info that will help...i work at Lexus, and we had an LS come in with the blank screen issue and had to replace the HDD (hard disc drive) you have to take the nav. screen out and theres two tamper proof torx screws on the back that hold a little door, open that and theres a clean or white thin plastic tab, pull on it and the HDD comes out...thats all your memory for the Nav.
BCF, the LS's Navi in the Middle East and some other quarters are set up differently than here. Updates are made via DVD, so there's no HDD involved. This question is better directed at other users in areas that are similarly configured.
but an incident happened to me, once i turned my car on and after a menute suddenly the screen turned off and on again by itself and all the marks and routs a recorded were gone, even the last searched things lol